ci: run the Windows tests on a runner with KVM (#1369)

Run the Windows tests on `ubuntu-latest-kvm` as a PR job, with the installed Windows cached, minutes instead of ~1h40m. Aligned with https://gitea.com/gitea/gitea-mcp/pulls/321 and https://gitea.com/gitea/cli/pulls/79.

Co-authored-by: silverwind <me@silverwind.io>
Reviewed-on: https://gitea.com/gitea/runner/pulls/1369
Reviewed-by: silverwind <2021+silverwind@noreply.gitea.com>
Co-authored-by: Zettat123 <zettat123@gmail.com>

.dockerignore

@@ -45,8 +45,13 @@ cpu.out
 
 /bin
 /dist
+/.tmp
+/.git/hooks
+/.git/logs
+/.git/rr-cache
 /.env
 /.runner
+/.runner.lock
 /config.yaml
 /Dockerfile
 .DS_Store

.gitea/actions/go-setup/action.yml

@@ -0,0 +1,29 @@
+name: go-setup
+description: Set up go and restore its caches, which only the cache-seeder workflow saves
+
+runs:
+  using: composite
+  steps:
+    - uses: actions/setup-go@b7ad1dad31e06c5925ef5d2fc7ad053ef454303e # v7
+      id: setup-go
+      with:
+        go-version-file: go.mod
+        check-latest: true
+        cache: false
+    - if: ${{ github.workflow == 'cache-seeder' }}
+      uses: actions/cache@55cc8345863c7cc4c66a329aec7e433d2d1c52a9 # v6.1.0
+      with:
+        path: |
+          ~/go/pkg/mod
+          ~/.cache/go-build
+          ~/.cache/golangci-lint
+        key: go-${{ runner.os }}-${{ runner.arch }}-${{ steps.setup-go.outputs.go-version }}-${{ hashFiles('go.mod', 'go.sum', '.golangci.yml', 'Makefile', '.gitea/actions/go-setup/action.yml', '.gitea/workflows/cache-seeder.yml') }}
+    - if: ${{ github.workflow != 'cache-seeder' }}
+      uses: actions/cache/restore@55cc8345863c7cc4c66a329aec7e433d2d1c52a9 # v6.1.0
+      with:
+        path: |
+          ~/go/pkg/mod
+          ~/.cache/go-build
+          ~/.cache/golangci-lint
+        key: go-${{ runner.os }}-${{ runner.arch }}-${{ steps.setup-go.outputs.go-version }}-${{ hashFiles('go.mod', 'go.sum', '.golangci.yml', 'Makefile', '.gitea/actions/go-setup/action.yml', '.gitea/workflows/cache-seeder.yml') }}
+        restore-keys: go-${{ runner.os }}-${{ runner.arch }}-${{ steps.setup-go.outputs.go-version }}-

.gitea/workflows/cache-seeder.yml

@@ -0,0 +1,26 @@
+name: cache-seeder
+
+on:
+  workflow_dispatch:
+  push:
+    branches:
+      - main
+    paths:
+      - go.mod
+      - go.sum
+      - .golangci.yml
+      - Makefile
+      - .gitea/actions/go-setup/action.yml
+      - .gitea/workflows/cache-seeder.yml
+
+jobs:
+  seed:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
+      - uses: ./.gitea/actions/go-setup
+      - run: make deps-tools lint build
+      - name: compile the test binaries without running them
+        run: |
+          make test GOTEST_FLAGS='-race -exec true'
+          go test -tags e2e -exec true ./e2e/...

.gitea/workflows/pull-pr-title.yml

@@ -19,9 +19,9 @@ jobs:
     timeout-minutes: 5
     steps:
     - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
-    - uses: actions/setup-node@820762786026740c76f36085b0efc47a31fe5020 # v7
+    - uses: actions/setup-node@949feb2413d6458794dcd2491c4babbbce0c15c1 # v7
       with:
-        node-version: 24
+        node-version: 26
     - run: make lint-pr-title
       env:
         PR_TITLE: ${{ github.event.pull_request.title }}

.gitea/workflows/release-nightly.yml

@@ -11,7 +11,6 @@ on:
 
 env:
   DOCKER_ORG: gitea
-  DOCKER_LATEST: nightly
 
 jobs:
   goreleaser:
@@ -36,7 +35,7 @@ jobs:
           go-version-file: "go.mod"
           check-latest: true
       - name: goreleaser
-        uses: goreleaser/goreleaser-action@f06c13b6b1a9625abc9e6e439d9c05a8f2190e94 # v7
+        uses: goreleaser/goreleaser-action@a4f02ab5355a589de60d917a659ce617ed19b3de # v7
         with:
           distribution: goreleaser-pro
           args: release --nightly
@@ -74,13 +73,13 @@ jobs:
           fetch-depth: 0 # all history for all branches and tags
 
       - name: Set up QEMU
-        uses: docker/setup-qemu-action@96fe6ef7f33517b61c61be40b68a1882f3264fb8 # v4
+        uses: docker/setup-qemu-action@99012661954931238ded8c8b007157a8430204e1 # v4
 
       - name: Set up Docker BuildX
-        uses: docker/setup-buildx-action@37fe631027851001ddb9b187196cc803df7f5f0e # v4
+        uses: docker/setup-buildx-action@f87e5991a6d7451dcb8d9637bfbc97413f497069 # v4
 
       - name: Login to DockerHub
-        uses: docker/login-action@dbcb813823bdd20940b903addbd779551569679f # v4
+        uses: docker/login-action@81c6f93d4bc991e510b342a00b419b3bb4efc5c6 # v4
         with:
           username: ${{ secrets.DOCKER_USERNAME }}
           password: ${{ secrets.DOCKER_PASSWORD }}
@@ -94,7 +93,7 @@ jobs:
           echo REPO_VERSION=$(git describe --tags --always | sed 's/-/+/' | sed 's/^v//') >> $GITHUB_OUTPUT
 
       - name: Build and push
-        uses: docker/build-push-action@53b7df96c91f9c12dcc8a07bcb9ccacbed38856a # v7
+        uses: docker/build-push-action@c3c9e263c25d99ce0380d002d59b67737d91b0dc # v7
         with:
           context: .
           file: ./Dockerfile

.gitea/workflows/release-tag.yml

@@ -35,7 +35,7 @@ jobs:
           passphrase: ${{ secrets.PASSPHRASE }}
           fingerprint: CC64B1DB67ABBEECAB24B6455FC346329753F4B0
       - name: goreleaser
-        uses: goreleaser/goreleaser-action@f06c13b6b1a9625abc9e6e439d9c05a8f2190e94 # v7
+        uses: goreleaser/goreleaser-action@a4f02ab5355a589de60d917a659ce617ed19b3de # v7
         with:
           distribution: goreleaser-pro
           args: release
@@ -69,7 +69,6 @@ jobs:
       image: catthehacker/ubuntu:act-latest
     env:
       DOCKER_ORG: gitea
-      DOCKER_LATEST: latest
     steps:
       - name: Checkout
         uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
@@ -77,13 +76,13 @@ jobs:
           fetch-depth: 0 # all history for all branches and tags
 
       - name: Set up QEMU
-        uses: docker/setup-qemu-action@96fe6ef7f33517b61c61be40b68a1882f3264fb8 # v4
+        uses: docker/setup-qemu-action@99012661954931238ded8c8b007157a8430204e1 # v4
 
       - name: Set up Docker BuildX
-        uses: docker/setup-buildx-action@37fe631027851001ddb9b187196cc803df7f5f0e # v4
+        uses: docker/setup-buildx-action@f87e5991a6d7451dcb8d9637bfbc97413f497069 # v4
 
       - name: Login to DockerHub
-        uses: docker/login-action@dbcb813823bdd20940b903addbd779551569679f # v4
+        uses: docker/login-action@81c6f93d4bc991e510b342a00b419b3bb4efc5c6 # v4
         with:
           username: ${{ secrets.DOCKER_USERNAME }}
           password: ${{ secrets.DOCKER_PASSWORD }}
@@ -103,7 +102,7 @@ jobs:
             suffix=${{ matrix.variant.tag_suffix }},onlatest=true
 
       - name: Build and push
-        uses: docker/build-push-action@53b7df96c91f9c12dcc8a07bcb9ccacbed38856a # v7
+        uses: docker/build-push-action@c3c9e263c25d99ce0380d002d59b67737d91b0dc # v7
         with:
           context: .
           file: ./Dockerfile

.gitea/workflows/test.yml

@@ -1,9 +1,7 @@
 name: checks
 on:
-  push:
-    branches:
-      - main
   pull_request:
+  workflow_dispatch:
 
 env:
   # The runner image ships a stale docker.io login; point docker at an empty config so
@@ -19,25 +17,24 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
-      - uses: actions/setup-go@b7ad1dad31e06c5925ef5d2fc7ad053ef454303e # v7
-        with:
-          go-version-file: 'go.mod'
-          check-latest: true
+      - uses: ./.gitea/actions/go-setup
       - name: prepare anonymous docker config
         run: mkdir -p "$DOCKER_CONFIG" && echo '{}' > "$DOCKER_CONFIG/config.json"
       # Pre-pull act/runner's two largest base images so a slow pull can't dominate `make test`;
       # the rest (alpine/ubuntu) pull on demand, absorbed by the make-test -timeout. The host
-      # daemon retains them between runs, so this is usually a fast manifest re-check.
+      # daemon retains them between runs, and their digest pins skip the registry when it has them.
       - name: pre-pull test images
         env:
-          TEST_JOB_IMAGE: node:24-bookworm-slim@sha256:ba849c60be29959425b8734d57b8b4b7d56f98edd9504c9af091d5281095a71e # renovate: datasource=docker
-          TEST_SERVICE_IMAGE: nginx:alpine@sha256:db35bfc6b2951e7f8a72db5db120288c127ffaeeb4a6d4b95a26fead017d5913 # renovate: datasource=docker
+          TEST_JOB_IMAGE: node:26-bookworm-slim@sha256:bc0a2afd3b74ce12222fc8bab99271e66257f021078f5f4a5d687a77d280c1d9 # renovate: datasource=docker
+          TEST_SERVICE_IMAGE: nginx:alpine@sha256:a3554c0d0b48177b1413c26e01f695334428020d9df01243fbae3e11cfd17417 # renovate: datasource=docker
         run: |
           for image in "$TEST_JOB_IMAGE" "$TEST_SERVICE_IMAGE"; do
-            for attempt in 1 2 3; do
-              docker pull "$image" && break
-              [ "$attempt" = 3 ] || sleep 5
-            done
+            if [ "$(docker image inspect --format '{{.Os}}/{{.Architecture}}' "$image" 2>/dev/null)" != linux/amd64 ]; then
+              for attempt in 1 2 3; do
+                docker pull "$image" && break
+                [ "$attempt" = 3 ] || sleep 5
+              done
+            fi
             docker tag "$image" "${image%@*}"
           done
       - name: lint
@@ -53,11 +50,36 @@ jobs:
       # after `make test` so the images it needs are already present on the host daemon.
       - name: test against dind image
         run: make test-dind
+      - name: test against podman
+        run: make test-dind TARGET=podman
       - name: coverage report
         run: |
           make coverage-report
           cat .tmp/coverage.md >> "$GITHUB_STEP_SUMMARY"
 
+  windows:
+    name: test on windows
+    runs-on: ubuntu-latest-kvm
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
+      - uses: ./.gitea/actions/go-setup
+      - name: prepare anonymous docker config
+        run: mkdir -p "$DOCKER_CONFIG" && echo '{}' > "$DOCKER_CONFIG/config.json"
+      - uses: actions/cache/restore@55cc8345863c7cc4c66a329aec7e433d2d1c52a9 # v6.1.0
+        with:
+          path: ~/.cache/windows-vm
+          key: windows-vm
+      - name: test on windows
+        id: test-windows
+        run: WINDOWS_TEST_CACHE="$HOME/.cache/windows-vm" make test-windows
+        env:
+          WINDOWS_TEST_TIMEOUT: 45
+      - if: always() && steps.test-windows.outputs.save-cache == 'true'
+        uses: actions/cache/save@55cc8345863c7cc4c66a329aec7e433d2d1c52a9 # v6.1.0
+        with:
+          path: ~/.cache/windows-vm
+          key: windows-vm
+
   e2e:
     name: gitea compatibility (${{ matrix.gitea_image }})
     runs-on: ubuntu-latest
@@ -68,10 +90,7 @@ jobs:
           - gitea/gitea:main-nightly
     steps:
       - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
-      - uses: actions/setup-go@b7ad1dad31e06c5925ef5d2fc7ad053ef454303e # v7
-        with:
-          go-version-file: 'go.mod'
-          check-latest: true
+      - uses: ./.gitea/actions/go-setup
       - name: prepare anonymous docker config
         run: mkdir -p "$DOCKER_CONFIG" && echo '{}' > "$DOCKER_CONFIG/config.json"
       - name: e2e compatibility

.gitignore

@@ -1,4 +1,5 @@
 /gitea-runner
+/gitea-runner.exe
 .env
 !/act/runner/testdata/secrets/.env
 .runner

.golangci.yml

@@ -39,6 +39,13 @@ linters:
           deny:
             - pkg: golang.org/x/exp
               desc: it's experimental and unreliable
+        logging:
+          files:
+            - $all
+            - "!**/act/common/logging/**"
+          deny:
+            - pkg: log/slog
+              desc: log through gitea.com/gitea/runner/act/common/logging
     nolintlint:
       allow-unused: false
       require-explanation: true

.goreleaser.yaml

@@ -28,38 +28,16 @@ builds:
   ignore:
     - goos: darwin
       goarch: arm
-    - goos: darwin
-      goarch: ppc64le
     - goos: darwin
       goarch: s390x
-    - goos: windows
-      goarch: ppc64le
     - goos: windows
       goarch: s390x
     - goos: windows
       goarch: arm
-      goarm: "5"
-    - goos: windows
-      goarch: arm
-      goarm: "6"
-    - goos: windows
-      goarch: arm
-      goarm: "7"
-    - goos: windows
-      goarch: arm64
-    - goos: freebsd
-      goarch: ppc64le
     - goos: freebsd
       goarch: s390x
     - goos: freebsd
       goarch: arm
-      goarm: "5"
-    - goos: freebsd
-      goarch: arm
-      goarm: "6"
-    - goos: freebsd
-      goarch: arm
-      goarm: "7"
     - goos: freebsd
       goarch: arm64
   flags:

CLAUDE.md

@@ -1 +0,0 @@
-@AGENTS.md

DEVELOPMENT.md

@@ -28,14 +28,54 @@ depending on the prefix:
 - **No prefix?** Do not escape, and split multi-line values into one row each.
 - **Interpolating a secret?** Masking runs after escaping, so `AppendSecretMasker` registers the
   encoded forms too.
-- Command *properties* also escape `%3A` and `%2C`, which the UI never decodes, so the reporter
-  decodes exactly those two when folding a location into an annotation.
+- Command *properties* also escape `%3A` and `%2C`, which the UI never decodes, so the command
+  handler folds an annotation's location into its decoded message and escapes the result again.
+
+## Logging
+
+Log through `act/common/logging`; the linter rejects importing `log/slog` elsewhere.
+A job's logger comes from `common.Logger(ctx)`; code with no job uses the package functions
+(`logging.Infof`, `logging.With`). Both take printf-style messages, and `With("key", value)` adds
+fields.
+
+- The process-wide logger masks the secrets of every live task, the job logger masks its own.
+  Going around either leaks them.
+- The job logger's output can reach the job log workflow authors see, the process-wide logger's
+  stays on the runner host, so keep operator-only detail (host paths, internal addresses) off the
+  job logger.
+- Libraries that log through slog's global logger are forwarded to the process-wide one, so they
+  follow its level and masking too. Avoid dependencies that log through logrus, nothing forwards it.
+- Tests read what was logged with `logtest.NewLogger()`, or `logtest.SetDefault(t)` for the
+  package functions.
+
+## Built-in actions
+
+Each lives in `internal/pkg/action/<name>` and is registered in `builtinActions` in
+`act/runner/step_action_builtin.go`.
 
 ## End-to-end compatibility tests
 
 `make test-e2e` runs the runner against `E2E_GITEA_IMAGE`. It defaults to the nightly image.
 It requires Docker and is excluded from `make test`. CI runs stable and nightly variants in
-parallel.
+parallel. Outside a container it runs `go test` in a Linux container on its own network, as CI does,
+so both take the same paths. `E2E_ARGS` passes extra flags, e.g. `make test-e2e E2E_ARGS='-run TestCompatibility/dispatch'`.
 
-The suite shares one Gitea and regular runner. Cache and ephemeral scenarios use isolated
+The `cli_*` scenarios build the binary and drive `register` and `daemon` as a user would, including `--once`,
+`--labels` and shutdown with a running job. `failure_paths` covers failed, skipped and tolerated jobs, `job_timeout`
+a job killed at the runner's deadline. `label_routing` and `capacity` cover scheduling, `reconnect` drops the
+connection to Gitea through a proxy, and `host_mode` and `reusable_workflow` cover host labels and `workflow_call`.
+`dispatch`, `failure_paths` and `reusable_workflow` run in every mode: through the daemon and `exec`, each on
+Docker and Kubernetes.
+
+The suite shares one Gitea, regular runner and k3s cluster. Cache and ephemeral scenarios use isolated
 repository runners. A run path is `<workflow>@<ref>` and a log row is `<timestamp>Z <payload>`.
+
+## Windows tests
+
+`make test-windows` cross-compiles the test binaries, installs Windows Server 2025 Core in a
+[dockur/windows](https://github.com/dockur/windows) QEMU VM on the docker host and runs them there.
+The host must be amd64 and allow privileged containers. `WINDOWS_TEST_TIMEOUT` sets the minutes
+allowed for installing Windows and running the tests, 165 by default. The VM uses KVM when the host
+has `/dev/kvm`, otherwise Windows is emulated and much slower. Docker-backed tests skip in the VM
+and the race detector is off, it needs cgo. `WINDOWS_TEST_CACHE` names a directory to keep the
+installed Windows in, so later runs skip the install. CI runs this on every pull request.

Dockerfile

@@ -1,7 +1,7 @@
 ### BUILDER STAGE
 #
 #
-FROM golang:1.27-alpine3.23 AS builder
+FROM golang:1.27-alpine AS builder
 
 # Do not remove `git` here, it is required for getting runner version when executing `make build`
 RUN apk add --no-cache make git
@@ -12,12 +12,14 @@ ENV GOPROXY=${GOPROXY:-}
 COPY . /opt/src/runner
 WORKDIR /opt/src/runner
 
-RUN make clean && make build
+RUN --mount=type=cache,target=/go/pkg/mod \
+    --mount=type=cache,target=/root/.cache/go-build \
+    make clean && make build
 
 ### DIND VARIANT
 #
 #
-FROM docker:29.7.2-dind AS dind
+FROM docker:29.9.2-dind AS dind
 
 ARG VERSION=dev
 
@@ -32,12 +34,14 @@ COPY scripts/s6 /etc/s6
 
 VOLUME /data
 
+ENV TINI_SUBREAPER=1
+
 ENTRYPOINT ["s6-svscan","/etc/s6"]
 
 ### DIND-ROOTLESS VARIANT
 #
 #
-FROM docker:29.7.2-dind-rootless AS dind-rootless
+FROM docker:29.9.2-dind-rootless AS dind-rootless
 
 ARG VERSION=dev
 
@@ -56,6 +60,7 @@ VOLUME /data
 RUN mkdir -p /data && chown -R rootless:rootless /etc/s6 /data
 
 ENV DOCKER_HOST=unix:///run/user/1000/docker.sock
+ENV TINI_SUBREAPER=1
 
 USER rootless
 ENTRYPOINT ["s6-svscan","/etc/s6"]

Makefile

@@ -1,25 +1,23 @@
 DIST := dist
-EXECUTABLE := gitea-runner
-DIST_DIRS := $(DIST)/binaries $(DIST)/release
 GO ?= go
-SHASUM ?= shasum -a 256
+EXECUTABLE := gitea-runner$(shell $(GO) env GOEXE)
 HAS_GO = $(shell hash $(GO) > /dev/null 2>&1 && echo "GO" || echo "NOGO" )
-XGO_PACKAGE ?= src.techknowlogick.com/xgo@v1.9.0 # renovate: datasource=go
-XGO_VERSION := go-1.27.x
-GXZ_PACKAGE ?= github.com/ulikunitz/xz/cmd/gxz@v0.5.16 # renovate: datasource=go
 
-LINUX_ARCHS ?= linux/amd64,linux/arm64
-DARWIN_ARCHS ?= darwin-12/amd64,darwin-12/arm64
-WINDOWS_ARCHS ?= windows/amd64
+PODMAN_TEST_IMAGE ?= quay.io/containers/podman:v5.8.9-immutable@sha256:87f42f37fa85b421664c30b8f5f9cfc23920057f5e5fcadf0b6f68d9edc6d415 # renovate: datasource=docker
+E2E_JOB_IMAGE ?= docker.gitea.com/runner-images:ubuntu-latest@sha256:657378e5cfd898e36f820459c60ef8e69be8fcda9fd354e4381a8b654d091bbc # renovate: datasource=docker
+SERVICE_IMAGE ?= nginx:1.31.7-alpine@sha256:892bb2152464f0c5d8972593a5f5afaf8054552580b699d95f8ff4af08c2d33d # renovate: datasource=docker
+E2E_GITEA_IMAGE ?= gitea/gitea:main-nightly
+E2E_K3S_IMAGE ?= rancher/k3s:v1.37.1-k3s1@sha256:ca7f37d993d82ef0dcdcfecb2e0e2618ea541dbaffc620c8cedebe01a82acd0d # renovate: datasource=docker
+WINDOWS_TEST_IMAGE ?= dockurr/windows:6.06@sha256:16fd7c39a3e48bb946d29c59dc6015942e5b900a1fa5d7e5552053bfc48ee2ea # renovate: datasource=docker
+
 GOFILES := $(shell find . -type f -name "*.go" -o -name "go.mod" ! -name "generated.*")
 
 DOCKER_IMAGE ?= gitea/runner
 DOCKER_TAG ?= nightly
 DOCKER_REF := $(DOCKER_IMAGE):$(DOCKER_TAG)
-DOCKER_ROOTLESS_REF := $(DOCKER_IMAGE):$(DOCKER_TAG)-dind-rootless
 
-GOLANGCI_LINT_PACKAGE ?= github.com/golangci/golangci-lint/v2/cmd/golangci-lint@v2.13.1 # renovate: datasource=go
-GOVULNCHECK_PACKAGE ?= golang.org/x/vuln/cmd/govulncheck@v1.7.0 # renovate: datasource=go
+GOLANGCI_LINT_PACKAGE ?= github.com/golangci/golangci-lint/v2/cmd/golangci-lint@v2.15.0 # renovate: datasource=go
+GOVULNCHECK_PACKAGE ?= golang.org/x/vuln/cmd/govulncheck@v1.9.0 # renovate: datasource=go
 
 GOTEST_FLAGS ?= -race -timeout 20m -parallel 8
 
@@ -32,22 +30,16 @@ endif
 ifeq ($(HAS_GO), GO)
 	GOPATH ?= $(shell $(GO) env GOPATH)
 	export PATH := $(GOPATH)/bin:$(PATH)
-
-	CGO_EXTRA_CFLAGS := -DSQLITE_MAX_VARIABLE_NUMBER=32766
-	CGO_CFLAGS ?= $(shell $(GO) env CGO_CFLAGS) $(CGO_EXTRA_CFLAGS)
 endif
 
 ifeq ($(OS), Windows_NT)
 	GOFLAGS := -v -buildmode=exe
-	EXECUTABLE ?= $(EXECUTABLE).exe
 	GO_ENV_WINDOWS := set GOOS=windows&&
 else ifeq ($(OS), Windows)
 	GOFLAGS := -v -buildmode=exe
-	EXECUTABLE ?= $(EXECUTABLE).exe
 	GO_ENV_WINDOWS := set GOOS=windows&&
 else
 	GOFLAGS := -v
-	EXECUTABLE ?= $(EXECUTABLE)
 	GO_ENV_WINDOWS := GOOS=windows
 endif
 
@@ -96,19 +88,12 @@ go-check:
 	fi
 
 .PHONY: fmt-check
-fmt-check: fmt
-	@diff=$$(git diff --color=always -- '*.go'); \
-	if [ -n "$$diff" ]; then \
-		echo "Please run 'make fmt' and commit the result:"; \
-		printf "%s" "$${diff}"; \
-		exit 1; \
-	fi
+fmt-check: ## check the Go code formatting
+	$(GO) run $(GOLANGCI_LINT_PACKAGE) fmt --diff-colored
 
 .PHONY: deps-tools
 deps-tools: ## install tool dependencies
 	$(GO) install $(GOLANGCI_LINT_PACKAGE) & \
-	$(GO) install $(GXZ_PACKAGE) & \
-	$(GO) install $(XGO_PACKAGE) & \
 	$(GO) install $(GOVULNCHECK_PACKAGE) & \
 	wait
 
@@ -149,13 +134,8 @@ tidy: ## run go mod tidy
 	fi
 
 .PHONY: tidy-check
-tidy-check: tidy
-	@diff=$$(git diff --color=always -- go.mod go.sum); \
-	if [ -n "$$diff" ]; then \
-		echo "Please run 'make tidy' and commit the result:"; \
-		printf "%s" "$${diff}"; \
-		exit 1; \
-	fi
+tidy-check: ## check that go.mod and go.sum are tidy
+	$(GO) mod tidy -diff
 
 .PHONY: test
 test: ## test everything (integration tests self-skip without docker/network)
@@ -168,17 +148,18 @@ coverage-report: ## turn coverage.txt from `make test` into .tmp/coverage.md
 	@echo "Wrote .tmp/coverage.md"
 
 .PHONY: test-dind
-test-dind: ## run the daemon-facing tests against the built dind image (TARGET=dind|dind-rootless)
-	@./scripts/test-dind.sh $(TARGET)
+test-dind: ## run the daemon-facing tests against the built dind image or podman (TARGET=dind|dind-rootless|podman)
+	@PODMAN_TEST_IMAGE=$(PODMAN_TEST_IMAGE) ./scripts/test-dind.sh $(TARGET)
+
+.PHONY: test-windows
+test-windows: ## run the tests on Windows Server Core in a QEMU VM on the docker host
+	@GO=$(GO) WINDOWS_TEST_IMAGE=$(WINDOWS_TEST_IMAGE) ./scripts/test-windows.sh
 
-E2E_JOB_IMAGE ?= node:24-bookworm@sha256:be23f54a88d34e8824c741b19b91064094f92c1c97b194144bfc8b50d67258e2 # renovate: datasource=docker
-SERVICE_IMAGE ?= nginx:1.31.4-alpine@sha256:db35bfc6b2951e7f8a72db5db120288c127ffaeeb4a6d4b95a26fead017d5913 # renovate: datasource=docker
-E2E_GITEA_IMAGE ?= gitea/gitea:main-nightly
 E2E_CONCURRENCY ?= 8
 
 .PHONY: test-e2e
 test-e2e: ## run Gitea compatibility tests against E2E_GITEA_IMAGE
-	@E2E_CONCURRENCY=$(E2E_CONCURRENCY) E2E_GITEA_IMAGE=$(E2E_GITEA_IMAGE) E2E_JOB_IMAGE=$(E2E_JOB_IMAGE) GO=$(GO) SERVICE_IMAGE=$(SERVICE_IMAGE) ./tools/test-e2e.sh
+	@E2E_CONCURRENCY=$(E2E_CONCURRENCY) E2E_GITEA_IMAGE=$(E2E_GITEA_IMAGE) E2E_K3S_IMAGE=$(E2E_K3S_IMAGE) E2E_JOB_IMAGE=$(E2E_JOB_IMAGE) GO=$(GO) SERVICE_IMAGE=$(SERVICE_IMAGE) ./tools/test-e2e.sh $(E2E_ARGS)
 
 .PHONY: install
 install: $(GOFILES) ## install the runner binary via `go install`
@@ -194,45 +175,6 @@ $(EXECUTABLE): $(GOFILES)
 deps-backend: ## install backend dependencies
 	$(GO) mod download
 
-.PHONY: release
-release: release-windows release-linux release-darwin release-copy release-compress release-check ## build release artifacts
-
-$(DIST_DIRS):
-	mkdir -p $(DIST_DIRS)
-
-.PHONY: release-windows
-release-windows: | $(DIST_DIRS)
-	CGO_CFLAGS="$(CGO_CFLAGS)" $(GO) run $(XGO_PACKAGE) -go $(XGO_VERSION) -buildmode exe -dest $(DIST)/binaries -tags 'netgo osusergo $(TAGS)' -ldflags '-s -w -linkmode external -extldflags "-static" $(LDFLAGS)' -targets '$(WINDOWS_ARCHS)' -out $(EXECUTABLE)-$(VERSION) .
-ifeq ($(CI),true)
-	cp -r /build/* $(DIST)/binaries/
-endif
-
-.PHONY: release-linux
-release-linux: | $(DIST_DIRS)
-	CGO_CFLAGS="$(CGO_CFLAGS)" $(GO) run $(XGO_PACKAGE) -go $(XGO_VERSION) -dest $(DIST)/binaries -tags 'netgo osusergo $(TAGS)' -ldflags '-s -w -linkmode external -extldflags "-static" $(LDFLAGS)' -targets '$(LINUX_ARCHS)' -out $(EXECUTABLE)-$(VERSION) .
-ifeq ($(CI),true)
-	cp -r /build/* $(DIST)/binaries/
-endif
-
-.PHONY: release-darwin
-release-darwin: | $(DIST_DIRS)
-	CGO_CFLAGS="$(CGO_CFLAGS)" $(GO) run $(XGO_PACKAGE) -go $(XGO_VERSION) -dest $(DIST)/binaries -tags 'netgo osusergo $(TAGS)' -ldflags '-s -w $(LDFLAGS)' -targets '$(DARWIN_ARCHS)' -out $(EXECUTABLE)-$(VERSION) .
-ifeq ($(CI),true)
-	cp -r /build/* $(DIST)/binaries/
-endif
-
-.PHONY: release-copy
-release-copy: | $(DIST_DIRS)
-	cd $(DIST); for file in `find . -type f -name "*"`; do cp $${file} ./release/; done;
-
-.PHONY: release-check
-release-check: | $(DIST_DIRS)
-	cd $(DIST)/release/; for file in `find . -type f -name "*"`; do echo "checksumming $${file}" && $(SHASUM) `echo $${file} | sed 's/^..//'` > $${file}.sha256; done;
-
-.PHONY: release-compress
-release-compress: | $(DIST_DIRS)
-	cd $(DIST)/release/; for file in `find . -type f -name "*"`; do echo "compressing $${file}" && $(GO) run $(GXZ_PACKAGE) -k -9 $${file}; done;
-
 .PHONY: docker
 docker: ## build the docker image
 	if ! docker buildx version >/dev/null 2>&1; then \

README.md

@@ -1,14 +1,28 @@
 # Gitea Runner
 
+Gitea Runner runs the jobs of Gitea Actions workflows. Register it with a Gitea instance to run jobs in Docker containers, Kubernetes pods or directly on the host.
+
 ## Installation
 
 ### Prerequisites
 
-Docker Engine Community version is required for docker mode. To install Docker CE, follow the official [install instructions](https://docs.docker.com/engine/install/).
+- Linux, macOS or Windows, or FreeBSD.
+- `git` 2.34.1 or newer.
+- `docker`, or `podman` with `podman.socket` enabled, for `docker` labels and Docker actions. See Docker's [install instructions](https://docs.docker.com/engine/install/).
+
+In the job image, or on the host for host jobs:
+
+- `bash` or `sh`, or `pwsh` or `powershell` on Windows.
+- `node` for JavaScript actions and `hashFiles()`.
+- `git` 2.34.1 or newer for [`builtin:checkout`](docs/builtin-actions.md).
+- `git-lfs` for `builtin:checkout` with `lfs: true`.
+- `ssh` for `builtin:checkout` with `ssh-key`.
+
+Kubernetes mode needs [a few more tools](docs/kubernetes.md) in job images.
 
 ### Download pre-built binary
 
-Visit [here](https://dl.gitea.com/gitea-runner/) and download the right version for your platform.
+Download the binary for your platform from [dl.gitea.com](https://dl.gitea.com/gitea-runner/).
 
 ### Build from source
 
@@ -24,7 +38,7 @@ make docker
 
 ## Quickstart
 
-Actions are disabled by default, so you need to add the following to the configuration file of your Gitea instance to enable it:
+Enable Actions in the configuration file of your Gitea instance:
 
 ```ini
 [actions]
@@ -37,99 +51,72 @@ ENABLED=true
 ./gitea-runner register
 ```
 
-And you will be asked to input:
+It asks for:
 
-1. Gitea instance URL, like `http://192.168.8.8:3000/`. You should use your gitea instance ROOT_URL as the instance argument
- and you should not use `localhost` or `127.0.0.1` as instance IP;
-2. Runner token, you can get it from `http://192.168.8.8:3000/admin/actions/runners`;
-3. Runner name, you can just leave it blank;
-4. Runner labels, you can just leave it blank.
+1. The Gitea instance URL. Use its `ROOT_URL`, not `localhost` or `127.0.0.1`.
+2. A runner token, from `/admin/actions/runners` on your instance.
+3. A runner name, the hostname when left blank.
+4. The runner [labels](#labels), the defaults when left blank.
 
-The process looks like:
-
-```text
-INFO Registering runner, arch=amd64, os=darwin, version=0.1.5.
-WARN Runner in user-mode.
-INFO Enter the Gitea instance URL (for example, https://gitea.com/):
-http://192.168.8.8:3000/
-INFO Enter the runner token:
-fe884e8027dc292970d4e0303fe82b14xxxxxxxx
-INFO Enter the runner name (if set empty, use hostname: Test.local):
-
-INFO Enter the runner labels, leave blank to use the default labels (comma-separated, for example, ubuntu-latest:docker://docker.gitea.com/runner-images:ubuntu-latest):
-
-INFO Registering runner, name=Test.local, instance=http://192.168.8.8:3000/, labels=[ubuntu-latest:docker://docker.gitea.com/runner-images:ubuntu-latest ubuntu-22.04:docker://docker.gitea.com/runner-images:ubuntu-22.04 ubuntu-20.04:docker://docker.gitea.com/runner-images:ubuntu-20.04].
-DEBU Successfully pinged the Gitea instance server
-INFO Runner registered successfully.
-```
-
-You can also register with command line arguments.
+To register without prompts:
 
 ```bash
-./gitea-runner register --instance http://192.168.8.8:3000 --token <my_runner_token> --no-interactive
+./gitea-runner register --instance https://gitea.example.com --token <token> --no-interactive
 ```
 
-If the registry succeed, it will run immediately. Next time, you could run the runner directly.
-
 ### Run
 
 ```bash
 ./gitea-runner daemon
 ```
 
+## Deployment
+
+### Windows service
+
+Register the runner first, keeping `gitea-runner.exe`, `config.yaml` and the `.runner` file in one directory. Then install and start the service from an elevated Command Prompt:
+
+```bat
+sc.exe create gitea-runner binPath= "\"C:\gitea-runner\gitea-runner.exe\" daemon --config \"C:\gitea-runner\config.yaml\"" start= auto
+sc.exe start gitea-runner
+```
+
+The service logs to `gitea-runner.log` next to the executable. Its account needs write access to that directory and access to the tools jobs use.
+
+`sc.exe stop gitea-runner` lets running jobs finish within `runner.shutdown_timeout`. To allow the same on shutdown, raise the service's preshutdown timeout above it, here to six minutes. This takes effect after the next reboot:
+
+```bat
+reg.exe add HKLM\SYSTEM\CurrentControlSet\Services\gitea-runner /v PreshutdownTimeout /t REG_DWORD /d 360000 /f
+```
+
 ### Run with docker
 
-```bash
-docker run -e GITEA_INSTANCE_URL=https://your_gitea.com -e GITEA_RUNNER_REGISTRATION_TOKEN=<your_token> -v /var/run/docker.sock:/var/run/docker.sock --name my_runner gitea/runner:nightly
-```
-
-Mount a volume on `/data` if you want the registration file and optional config to survive container recreation (see [scripts/run.sh](scripts/run.sh)).
-
-> **`/data` does not hold the image cache.** It is the runner's working directory and contains only the `.runner` registration file and, optionally, your config file. Images pulled for jobs live in the *Docker daemon's* data root, which for the `dind` flavours is inside the container (`/var/lib/docker`, or `/home/rootless/.local/share/docker` for `dind-rootless`). To keep the image cache across restarts, give that path its own volume as well — otherwise every new container re-pulls the job images. With the `basic` flavour the images live on whichever daemon you point the runner at, so there is nothing extra to persist.
-
-### Image flavours
-
-The image is published in three flavours, all built from the single multi-stage [Dockerfile](Dockerfile) in this repository. They differ only in how a Docker daemon is made available to the jobs the runner executes; the `gitea-runner` binary inside them is identical.
-
-| Tag | Build target | Base image | Docker daemon | Process supervisor | Runs as |
-| --- | --- | --- | --- | --- | --- |
-| `latest` (and `<version>`) | `basic` | `alpine` | none — uses an external daemon you provide | [`tini`](https://github.com/krallin/tini) | `root` |
-| `latest-dind` | `dind` | `docker:dind` | bundled, started inside the container | [`s6`](https://skarnet.org/software/s6/) | `root` (privileged) |
-| `latest-dind-rootless` | `dind-rootless` | `docker:dind-rootless` | bundled, started rootless inside the container | [`s6`](https://skarnet.org/software/s6/) | `rootless` (UID 1000) |
-
-#### `latest` — basic
-
-The default flavour ships only the runner on a minimal Alpine base. It contains **no Docker daemon of its own**: jobs that use `docker://` images need a daemon supplied from outside the container, typically by bind-mounting the host's socket:
-
-```bash
-docker run -e GITEA_INSTANCE_URL=https://your_gitea.com -e GITEA_RUNNER_REGISTRATION_TOKEN=<your_token> \
-  -v /var/run/docker.sock:/var/run/docker.sock --name my_runner gitea/runner:latest
-```
-
-`tini` is the entrypoint (it reaps zombie processes), and it just runs [`scripts/run.sh`](scripts/run.sh), which registers the runner on first start and then execs `gitea-runner daemon`. This flavour does not need `--privileged`. The trade-off is that jobs share the host's daemon, so they can see other containers and images on that daemon.
-
-#### `latest-dind` — Docker-in-Docker
-
-This flavour is based on the official `docker:dind` image and bundles its own Docker daemon, so it needs no external socket — only the `--privileged` flag that Docker-in-Docker requires:
+The recommended Docker-in-Docker image runs its own Docker daemon for jobs. Jobs never get the host's Docker socket, which is equivalent to root access on the host.
 
 ```bash
 docker run --privileged -e GITEA_INSTANCE_URL=https://your_gitea.com -e GITEA_RUNNER_REGISTRATION_TOKEN=<your_token> \
-  --name my_runner gitea/runner:latest-dind
+  -v "$PWD/data:/data" -v runner-docker:/var/lib/docker --name my_runner gitea/runner:nightly-dind
 ```
 
-Two processes have to run side by side here (the Docker daemon and the runner), so the entrypoint is the [`s6`](https://skarnet.org/software/s6/) supervision tree under [`scripts/s6`](scripts/s6) instead of `tini`. `s6` starts `dockerd`, and the runner service waits for the daemon to come up (`s6-svwait`) before launching [`run.sh`](scripts/run.sh). Each container has a private daemon isolated from the host's, at the cost of running privileged.
+The volumes keep the registration and the image cache across container recreation. The image reads more variables, such as `GITEA_RUNNER_LABELS` and `CONFIG_FILE`, see [scripts/run.sh](scripts/run.sh) and the [Docker example](examples/docker/README.md).
 
-#### `latest-dind-rootless` — rootless Docker-in-Docker
+#### Image flavours
 
-Same idea as `dind`, but built on `docker:dind-rootless` so the bundled daemon and the runner run as an unprivileged user (`rootless`, UID 1000) rather than `root`. `DOCKER_HOST` is preset to `unix:///run/user/1000/docker.sock` so the runner talks to the rootless daemon. This reduces the blast radius compared to the privileged `dind` flavour, but rootless Docker carries the usual rootless limitations (networking, cgroups, storage drivers, and some operations that need additional host configuration such as `/etc/subuid` / `/etc/subgid` mappings and unprivileged user-namespace support).
+| Tag | Docker daemon for jobs |
+| --- | --- |
+| `latest-dind` (recommended) | Bundled, needs `--privileged`. |
+| `latest-dind-rootless` | Bundled, runs as UID 1000 for stronger isolation. Needs `--privileged` and [rootless Docker](https://docs.docker.com/engine/security/rootless/) support on the host. Its image cache is in `/home/rootless/.local/share/docker`. |
+| `latest` | None. Mount the host's `/var/run/docker.sock`, or set `DOCKER_HOST`. |
 
-> **The UID is fixed at 1000.** It comes from the `rootless` user baked into the upstream `docker:dind-rootless` base image, and the bundled daemon always listens on `/run/user/1000/docker.sock` inside the container, so running this flavour as a different user (`--user 1001`) does not work. If you need the runner to talk to a *host* rootless daemon that runs under some other UID, use the `basic` flavour instead and bind-mount that daemon's socket (see [examples/vm/rootless-docker.md](examples/vm/rootless-docker.md)); pointing `DOCKER_HOST` at a host socket from inside `dind-rootless` will not work. Changing the UID otherwise means rebuilding the image from a base with a different `rootless` user.
+Versioned and `nightly` tags take the same suffixes, like `nightly-dind`. The images target Docker, not Podman.
 
-> **Note on Podman:** these images target the Docker daemon. The bundled `dind`/`dind-rootless` daemons are `dockerd`, not Podman, and the `basic` flavour expects a Docker-compatible socket. Running them under rootless Podman is not a supported configuration, though pointing the `basic` flavour at a Podman socket that emulates the Docker API may work for some workloads.
+### Example deployments
 
-### Configuration
+See the [examples](examples) directory for more deployments, among them systemd, Kubernetes and VMs.
 
-The runner reads a YAML file. Without one, every option keeps its default.
+## Configuration
+
+The runner reads an optional YAML file:
 
 ```bash
 ./gitea-runner config init             # write config.yaml, with no option set
@@ -137,37 +124,68 @@ The runner reads a YAML file. Without one, every option keeps its default.
 ./gitea-runner -c config.yaml daemon   # -c also works on register and cache-server
 ```
 
-`config generate` prints [config.example.yaml](internal/pkg/config/config.example.yaml). Every value in it is commented out, so copy the lines you want to change into your own file and uncomment them.
+`config generate` prints [config.example.yaml](internal/pkg/config/config.example.yaml), which documents every option. Copy the lines you need into your file and uncomment them.
 
-#### Editing a config file
+### Editing a config file
 
-`config` edits a file in place, which is handy in provisioning scripts:
+`config` edits a file in place and keeps its comments, which suits provisioning scripts:
 
 ```bash
 ./gitea-runner config set runner.capacity 4
-./gitea-runner config set runner.timeout 90m  # written as 1h30m0s
 ./gitea-runner config set runner.envs.MY_VAR value
 ./gitea-runner config add runner.labels 'ubuntu:docker://node:22'
 ./gitea-runner config remove runner.labels 'ubuntu:docker://node:22'
 ./gitea-runner config get runner.labels
 ```
 
-A key is its dotted YAML path. An unknown key, a value of the wrong type, or `add`/`remove` on anything but a list is refused before the file is touched. `set` replaces a whole list when you give it several values.
+Keys are dotted YAML paths. Unknown keys and invalid values are refused without touching the file. Without `-c`, it uses `config.yaml` from the working directory, then from the binary's directory.
 
-An edit keeps the comments and the key order of the file. Indentation becomes two spaces, and a blank line between two values is dropped.
+### Environment variables
 
-`config get`, `set`, `add` and `remove` use `config.yaml` (or `config.yml`) from the working directory, then from the directory of the binary, and print their choice to stderr. `config init` writes `config.yaml` in the working directory, and refuses to overwrite an existing config without `--force`. Pass `-c` for another path.
+Config values can read the runner's environment as `${NAME}`, for example `capacity: ${RUNNER_CAPACITY}`. An unset variable fails the load, and `$${NAME}` stays a literal `${NAME}`.
 
-#### Tool cache
+The override variables of earlier releases, such as `GITEA_RUNNER_CAPACITY`, are gone. Set those options in the file instead.
 
-Setup actions like `setup-go` install tools into `RUNNER_TOOL_CACHE`, which is `/opt/hostedtoolcache` inside a job. `runner.tool_cache_mode` selects what backs it:
+### Labels
 
-| Mode | Tool cache | Trade-off |
-| --- | --- | --- |
-| `none` (default) | Per job, provided by the job image | A version the image lacks is downloaded in every job |
-| `shared` | One volume reused by every job | Two jobs writing the same tool version at once corrupt it, so use it only with `runner.capacity: 1` |
+Labels decide which jobs a runner accepts and how it runs them. A job's `runs-on` is matched against the label names, and the first match picks where it runs.
 
-With `none`, tools must come from the job image. Install them into `/opt/hostedtoolcache/<tool>/<version>/<arch>`, with an empty `<arch>.complete` file next to the directory:
+A label is written as `<name>[:<schema>[:<args>]]`, with one of these schemas:
+
+- `docker://<image>` runs the job in a container of `<image>`.
+- `kubernetes://<image>` runs it as a Kubernetes pod, see [docs/kubernetes.md](docs/kubernetes.md).
+- `host`, the default, runs its steps directly on the runner's machine.
+
+With these labels, `runs-on: ubuntu-latest` runs in a container and `runs-on: macos` on the host:
+
+```text
+ubuntu-latest:docker://docker.gitea.com/runner-images:ubuntu-latest,macos:host
+```
+
+[gitea/runner-images](https://gitea.com/gitea/runner-images) has suitable images. Jobs matching no label run in `runner.default_image`, or on the host when docker is unavailable.
+
+Host jobs still need a Docker daemon for Docker actions and `docker://` steps. Windows hosts do not support those, as on GitHub. On Windows, a step's background processes end with the job unless it opts out, see [host mode](docs/host-mode.md).
+
+#### Registration vs config labels
+
+Labels are set at registration, with `--labels` or the prompt. To change them later, use one of these, the leftmost set one wins:
+
+```
+daemon --labels / GITEA_RUNNER_LABELS   >   runner.labels in the config file   >   labels in the .runner file
+```
+
+Changed labels are saved to the `.runner` file and sent to Gitea on startup. When `runner.labels` is set, `register` uses it and ignores `--labels`.
+
+### Tool cache
+
+Setup actions like `setup-go` install tools into `RUNNER_TOOL_CACHE`. `runner.tool_cache_mode` selects what backs it:
+
+| Mode | Tool cache |
+| --- | --- |
+| `none` (default) | Provided by the job image. Versions it lacks are downloaded in every job. |
+| `shared` | One volume for all jobs. Only safe with `runner.capacity: 1`. |
+
+To ship tools in a job image, install them to `/opt/hostedtoolcache/<tool>/<version>/<arch>` with an empty `<arch>.complete` file next to it, as the `-full` [runner images](https://gitea.com/gitea/runner-images) do:
 
 ```dockerfile
 RUN GO=$(curl -fsSL 'https://go.dev/dl/?mode=json' | grep -oP '"version": "\Kgo1\.26\.[0-9]*' | head -1); \
@@ -178,108 +196,9 @@ RUN GO=$(curl -fsSL 'https://go.dev/dl/?mode=json' | grep -oP '"version": "\Kgo1
   touch "${DIR}.complete"
 ```
 
-A workflow requesting a minor version, `go-version: "1.26"`, resolves to the newest matching version in the cache, so a patch update in the image still hits it.
+### Proxy
 
-Of the [runner images](https://gitea.com/gitea/runner-images), the `-full` flavour is the one that ships tools in this layout.
-
-`gitea-runner exec` reads no config file and takes `--tool-cache-mode` instead, defaulting to `none`.
-
-#### Environment variables
-
-Earlier releases let a few environment variables (`GITEA_DEBUG`, `GITEA_TRACE`, `GITEA_RUNNER_CAPACITY`, `GITEA_RUNNER_FILE`, `GITEA_RUNNER_ENVIRON`, `GITEA_RUNNER_ENV_FILE`) override parts of the config. They are gone, use the YAML file for all settings. The Docker images still read their own variables, such as `RUNNER_STATE_FILE`, see [scripts/run.sh](scripts/run.sh) and the container documentation below.
-
-### Labels
-
-Labels decide **which jobs a runner accepts** and **how it runs them**. A job's `runs-on` is matched against the runner's label names; the first match wins and selects the execution environment for that job.
-
-A label is written as:
-
-```text
-<name>[:<schema>[:<args>]]
-```
-
-| Part | Meaning |
-| --- | --- |
-| `name` | The name a workflow refers to in `runs-on`, e.g. `ubuntu-latest`. |
-| `schema` | Either `docker` or `host`. Defaults to `host` when omitted. |
-| `args` | Only used by the `docker` schema: the image to run the job in. |
-
-Two schemas are supported:
-
-- **`docker://<image>`** — the job runs inside a container created from `<image>`:
-
-  ```text
-  ubuntu-latest:docker://docker.gitea.com/runner-images:ubuntu-latest
-  ```
-
-- **`host`** — the job's steps run directly on the machine the runner is on, using the tools installed there:
-
-  ```text
-  macos:host
-  ```
-
-So with the labels
-
-```text
-ubuntu-latest:docker://docker.gitea.com/runner-images:ubuntu-latest,macos:host
-```
-
-a workflow with `runs-on: ubuntu-latest` is executed in the `runner-images:ubuntu-latest` container, and one with `runs-on: macos` is executed directly on the host.
-
-Names may themselves contain a colon (for example `pool:e57e18d4-10d4-406f-93bf-60f127221bdd`); only `host` and `docker` are treated as schemas.
-
-If a job's `runs-on` matches none of the runner's labels, or sets no `runs-on` at all, it still runs: in `runner.default_image` where docker is available, on the host where it is not. Images maintained for this purpose are listed at [gitea/runner-images](https://gitea.com/gitea/runner-images).
-
-Labels are chosen at registration time (`--labels`, or the interactive prompt) and can be changed afterwards by editing `runner.labels` in the config file, or in the Gitea UI under the runner's settings.
-
-#### Registration vs config labels
-
-If `runner.labels` is set in the YAML file, those labels are used during `register` and the `--labels` CLI flag is ignored.
-
-The `daemon` command also accepts `--labels` (which defaults to the `GITEA_RUNNER_LABELS` environment variable), so the labels of an already registered runner can be changed without deleting its registration file. The most explicit source wins:
-
-```
---labels / GITEA_RUNNER_LABELS   >   runner.labels in the config file   >   labels in the .runner file
-```
-
-Whenever the resulting labels differ from the ones in the registration file, they are written back to it and re-declared to the Gitea instance on startup.
-
-> **Note:** A runner that only exposes `host` labels still needs access to a Docker daemon (e.g. a mounted `/var/run/docker.sock`) whenever a job uses a `docker://` action or a service container. `host` labels only change where the job's own steps run; container-based steps and actions are still executed with Docker.
-
-#### Service containers
-
-A job's `services` are started before its steps run. When a service's image or its `options` declare a healthcheck, the runner waits for it to report healthy, so a workflow does not have to poll for its own services:
-
-```yaml
-services:
-  postgres:
-    image: postgres:17
-    options: >-
-      --health-cmd pg_isready
-      --health-interval 5s
-      --health-retries 10
-```
-
-A service that reports unhealthy fails the job right away, with its container log. One that never becomes healthy fails it after `container.service_ready_timeout` (default `5m`, negative disables the wait). A service that exits without declaring a healthcheck only gets its log and a warning.
-
-A job in a container reaches a service by its id on the job network, on the port the service listens on, for example `psql -h postgres -p 5432`. The started containers also fill the `job` context: `job.container.{id,network}` and `job.services.<id>.{id,network,ports}`, where `ports` maps a container port to the host port Docker published it on, for the services that publish one.
-
-Unlike GitHub, a job whose steps run on the host (a `host` label without `container:`) starts no service containers, so `job.services` and `job.container` stay empty. Give such a job a `container:` when it needs services.
-
-#### Docker from a job (`GITEA_DOCKER_WORKSPACE`)
-
-A container a job starts through the Docker socket cannot bind-mount the workspace by the job's own path, the daemon does not have it. `GITEA_DOCKER_WORKSPACE` holds the path the daemon sees. Use it as the prefix of workspace binds, with `.` as the fallback for local use, here in a `docker-compose.yaml`:
-
-```yaml
-volumes:
-  - ${GITEA_DOCKER_WORKSPACE:-.}/data:/app/data
-```
-
-Containers, networks and volumes a job creates through the socket are removed when the job ends. Both apply to jobs in containers, on the host `.` already works.
-
-#### Proxy
-
-Set these variables in the runner's environment, with systemd `Environment=`, `docker run -e`, or Kubernetes `env:`:
+Set the proxy in the runner's environment, for example with systemd `Environment=` or `docker run -e`:
 
 ```sh
 http_proxy=http://proxy.example:3128
@@ -287,126 +206,136 @@ https_proxy=http://proxy.example:3128
 no_proxy=gitea.internal,.example.local
 ```
 
-The runner uses them for its own requests and gives them to every job, in lower and upper case.
+The runner uses it and passes it on to jobs. Jobs always reach the cache server, `localhost`, their service containers and a `tcp://` Docker daemon directly. Add Gitea to `no_proxy` if it should be reached directly too.
 
-These hosts are added to `no_proxy` for jobs, so they are always reached directly:
+To change the proxy for jobs, use `runner.envs`, a step's `env:` or `$GITHUB_ENV`. Workflow and job level `env:` have no effect on it.
 
-- the cache server
-- `localhost`, `127.0.0.1` and `::1`
-- the job's service containers
-- the Docker daemon, when it is reached over `tcp://`
+The Docker daemon pulls images with its own proxy settings. The `dind` images pass the variables above to it, for other daemons see [the Docker documentation](https://docs.docker.com/engine/daemon/proxy/).
 
-Gitea is not added. Add it to `no_proxy` yourself if it should be reached directly.
+A password in the proxy URL is hidden in logs, but every step can read it.
 
-To change a value for one job, set it in a step's `env:` or in the job's `container.env`. Setting it at workflow or job level has no effect. To change it for the whole runner, set it in `runner.envs`. A `no_proxy` set there is added to the list above instead of replacing it.
+## Jobs
 
-Images are pulled by the Docker daemon, which needs its own proxy setting. In the `dind` images the daemon runs in the same container and reads the variables above. For any other daemon, see [the Docker documentation](https://docs.docker.com/engine/daemon/proxy/). The runner logs a warning at startup if it has a proxy and the daemon does not.
+### Service containers
 
-Dockerfile actions are built with these variables as build arguments, so their `RUN` steps can reach the network.
+When a service declares a healthcheck, in its image or `options`, the job waits for it to become healthy:
 
-A password in a proxy URL is hidden in job logs. Any step can still read it, because the step is given the proxy URL in its environment.
+```yaml
+services:
+  postgres:
+    image: postgres:18
+    options: >-
+      --health-cmd pg_isready
+      --health-interval 5s
+      --health-retries 10
+```
 
-#### Caching (`actions/cache`)
+A service that turns unhealthy, or is not healthy within `container.service_ready_timeout`, fails the job. Steps reach a service by its id and port, like `psql -h postgres -p 5432`.
 
-Each runner starts its own cache server automatically. Cache entries are local to that runner — runners do not share a cache by default.
+Unlike GitHub, jobs running on the host start no services. Give them a `container:` to use services.
 
-**Eviction**
+### Docker from a job (`GITEA_DOCKER_WORKSPACE`)
 
-An entry nothing has read or written for `retention` is removed, and a repository past `repo_size_limit` loses its least recently accessed entries until it fits; `size_limit` caps the whole cache the same way. Age alone never retires an entry still in use, and whatever these allow, the cache keeps free space above `health_check.min_free_disk_space_mb` when health checks are enabled.
+Containers a job starts can bind-mount the workspace by its path, like `docker run -v "$PWD:/src"`. Where the Docker daemon sees another path, for example a remote `DOCKER_HOST`, prefix the bind with `GITEA_DOCKER_WORKSPACE`:
 
-These apply where the cache server runs, so on a shared server they belong in *its* config, not the runners'. See `retention`, `repo_size_limit`, `size_limit` and `sweep_interval` in [config.example.yaml](internal/pkg/config/config.example.yaml) for units and defaults.
+```yaml
+volumes:
+  - ${GITEA_DOCKER_WORKSPACE:-.}/data:/app/data
+```
 
-**Cache service v2**
+In most Linux container jobs, the containers, networks and volumes a job creates are removed when it ends, `docker compose` services included. Set `container.sweep: false` if jobs deploy services to the runner's Docker daemon.
 
-`actions/cache@v4.2` and later can use the *cache service v2* API. The runner serves it from the same store as v1, on by default, and it works with `external_server`. Turn it off with:
+### Built-in actions (`uses: builtin:<name>`)
+
+`uses: builtin:checkout` checks out a repository without downloading `actions/checkout` or needing Node in the job image, see [docs/builtin-actions.md](docs/builtin-actions.md).
+
+### Caching (`actions/cache`)
+
+Each runner runs its own cache server. As on GitHub, a job restores caches of its own ref, its pull request's base branch and the default branch.
+
+#### Sharing a cache between runners
+
+Run one `gitea-runner cache-server` and point every runner at it with the same secret, for example from `openssl rand -hex 32`:
+
+```yaml
+# cache-server.yaml
+cache:
+  dir: /data/actcache
+  port: 8088
+  external_secret: "<secret>" # or external_secret_file: /path/to/secret
+```
+
+```bash
+gitea-runner -c cache-server.yaml cache-server
+```
+
+```yaml
+# each runner's config
+cache:
+  external_server: "http://<cache-server-host>:8088/"
+  external_secret: "<secret>"
+```
+
+Runners can also share one `cache.dir` on a file system with working file locks, at the cost of slower requests.
+
+#### Storing the cache in an S3-compatible bucket
+
+Runners can share a cache in an S3-compatible bucket, such as AWS S3, MinIO or RustFS, without a cache server:
 
 ```yaml
 cache:
-  v2: false
+  s3:
+    endpoint: "http://minio:9000"
+    region: "us-east-1"
+    bucket: "runner-cache"
+    prefix: "gitea-runner-cache"
+    path_style: true
+    access_key_file: "/run/secrets/cache-s3-access-key"
+    secret_key_file: "/run/secrets/cache-s3-secret-key"
 ```
 
-Those actions refuse any host they do not take for GitHub. Rather than misreport the server URL, the runner edits that check out of the action's own bundle on its way into the job, undone whenever the action is downloaded again. A bundle it does not recognise is left alone and keeps to v1. The same edit lets the stock `actions/upload-artifact` and `actions/download-artifact` work from `v4.4.0` on, without the `gitea-upload-artifact` fork, so it is made whatever `v2` says: that setting only governs the API the runner advertises. Set `runner.patch_actions: false` to leave every bundle exactly as shipped, an escape hatch for an action the edit breaks. The artifact actions then refuse again and the cache client keeps to v1.
+Eviction does not apply to the bucket. Add lifecycle rules that expire old caches and abort incomplete multipart uploads.
 
-**Shared cache across multiple runners**
+#### Eviction
 
-Run one dedicated `gitea-runner cache-server` that all runners point at.
+Entries unused for `cache.retention` (default `168h`) are removed. A repository over `cache.repo_size_limit` (default `10GB`) loses its least recently used entries. See [config.example.yaml](internal/pkg/config/config.example.yaml) for more limits.
 
-1. Create a config file for the cache server host:
+#### Cache service v2
 
-   ```yaml
-   cache:
-     dir: /data/actcache
-     port: 8088
-     external_secret: "replace-with-a-strong-random-secret"
-     # external_secret_file: /path/to/secret # secret can also be passed via a file
-   ```
+The runner serves the cache service v2 API used by current `actions/cache` releases. It patches them to use it on Gitea, which also makes the stock `actions/upload-artifact` and `actions/download-artifact` v4 work. Artifact calls then go through the cache server, so jobs must be able to reach it.
 
-2. Start the server:
+### Job hooks (`runner.hooks.job_started`, `runner.hooks.job_completed`)
 
-   ```bash
-   gitea-runner -c cache-server-config.yaml cache-server
-   ```
+Hook scripts run where the job's steps run, before the first step and after the last. They match GitHub's `ACTIONS_RUNNER_HOOK_JOB_STARTED` and `ACTIONS_RUNNER_HOOK_JOB_COMPLETED`.
 
-3. On every runner:
+Use them for per-job setup no workflow should carry, like registry logins or masking runner-wide secrets. They block the job, and a non-zero exit fails it. See [docs/job-hooks.md](docs/job-hooks.md).
 
-   ```yaml
-   cache:
-     external_server: "http://<cache-server-host>:8088/"
-     external_secret: "replace-with-a-strong-random-secret"  # must match the server
-     # external_secret_file: /path/to/secret # secret can also be passed via a file
-   ```
+### Secret masking
 
-Jobs reach the cache server at `external_server`, so when a reverse proxy fronts the server, point `external_server` at the proxy. The cache server itself needs no extra configuration.
+Secrets and `::add-mask::` values are hidden in job logs, [local job logs](#local-job-logs-logjobdir), job summaries and container names. As on GitHub, a job output containing one is dropped with a warning.
 
-Alternatively, mount the same NFS/CIFS share on every runner and point `cache.dir` at it — simpler, but with weaker isolation between repositories.
+## Operation
 
-**S3 / MinIO** — mount object storage as a FUSE filesystem (e.g. [s3fs](https://github.com/s3fs-fuse/s3fs-fuse) or [goofys](https://github.com/kahing/goofys)) and set `cache.dir` to the mount point.
+### Idle cleanup
 
-Flags `--dir`, `--host`, and `--port` on `cache-server` override the corresponding `cache.*` YAML keys; all other settings, including `external_secret`, require the config file.
+While idle, the runner removes leftovers of earlier jobs every `runner.idle_cleanup_interval` (default `10m`):
 
-#### Official Docker image
+- Workspaces older than `runner.workdir_cleanup_age` (default `24h`), when `container.bind_workdir` is on. This assumes no other runner shares `container.workdir_parent`.
+- Unused Docker networks and volumes of jobs the runner did not tear down.
+- Kubernetes job pods older than `runner.workdir_cleanup_age`, with their Secrets.
 
-Besides `GITEA_INSTANCE_URL` and `GITEA_RUNNER_REGISTRATION_TOKEN`, the image entrypoint supports optional variables such as `CONFIG_FILE` (passed through as `-c`), `GITEA_RUNNER_LABELS`, `GITEA_RUNNER_EPHEMERAL`, `GITEA_RUNNER_ONCE`, `GITEA_RUNNER_NAME`, `GITEA_MAX_REG_ATTEMPTS`, `RUNNER_STATE_FILE`, and `GITEA_RUNNER_REGISTRATION_TOKEN_FILE`. See [scripts/run.sh](scripts/run.sh) for exact behavior.
+Set either option to `0` to turn cleanup off.
 
-For a fuller container-oriented walkthrough, see [examples/docker](examples/docker/README.md).
+### Post-task script (`runner.post_task_script`)
 
-While the runner is idle it cleans up after earlier jobs:
-- when `container.bind_workdir` is enabled, stale task workspace directories older than `runner.workdir_cleanup_age` are removed (default: `24h`; set `0` to disable)
-- only purely numeric subdirectories under `container.workdir_parent` are treated as task workspaces and may be removed
-- cleanup assumes `container.workdir_parent` is not shared across multiple runners
-- on runners that use docker, per-job networks left behind by jobs the runner did not live to tear down are removed, identified by the `com.gitea.runner.uuid` label carrying this runner's uuid
-- cleanup runs every `runner.idle_cleanup_interval` (default: `10m`; set `0` to disable), and setting either knob to `0` disables all of the above
+A host script that runs after each task's cleanup, for housekeeping like Docker pruning. The runner takes no new jobs until it exits or hits `runner.post_task_script_timeout` (default `5m`). Its output goes to the runner log.
 
-#### Post-task script (`runner.post_task_script`)
+On Windows, use an `.exe`, `.bat` or `.cmd` file, PowerShell scripts are not supported. See [docs/post-task-script.md](docs/post-task-script.md).
 
-Optional host script that runs **after** each task's built-in cleanup (post-steps, container teardown, bind-workdir removal). Use it for extra machine housekeeping — Docker pruning, disk cleanup, and similar.
+### Local job logs (`log.job.dir`)
 
-**While the script runs, the runner stops task heartbeats and stays offline from Gitea's perspective until the script exits (or hits `runner.post_task_script_timeout`, default `5m`).** A script that blocks without exiting keeps the runner from taking new work for up to that timeout. Script output goes to the runner log, not the job log; a non-zero exit is warned but does not change the job result.
+Set `log.job.dir` to keep a copy of every task's log, masked as in Gitea, with the job's result on the last line. Copies are kept for `log.job.retention` (default `168h`), so keep it above `runner.timeout`. Only the runner's user can read them.
 
-On Windows, use `.exe`, `.bat`, or `.cmd` paths; **PowerShell (`.ps1`) is not supported yet** as the configured path — wrap commands in a `.cmd` file instead.
+### OpenTelemetry (`OTEL_*`)
 
-See **[docs/post-task-script.md](docs/post-task-script.md)** for lifecycle details, environment variables, timeout interaction, and platform notes.
-
-#### Job hooks (`runner.hooks.job_started`, `runner.hooks.job_completed`)
-
-Optional scripts that run **inside the job environment** (the job container, or the host in host mode), before the job's first step and after its last one. They are the equivalent of GitHub's `ACTIONS_RUNNER_HOOK_JOB_STARTED` / `ACTIONS_RUNNER_HOOK_JOB_COMPLETED`, which are read when the settings are unset.
-
-Because they run where the steps run and see the job's environment, they are the place for per-job setup no workflow should have to carry: registry logins, mirror configuration, or masking runner-wide secrets with `::add-mask::`. Their output is part of the job log and is scanned for workflow commands, and they can export to the job through `$GITHUB_ENV` and `$GITHUB_PATH`.
-
-Both hooks are synchronous and block the job while they run. Either one exiting non-zero fails the job, and there is no per-hook timeout.
-
-See **[docs/job-hooks.md](docs/job-hooks.md)** for the execution order, environment, and platform notes.
-
-#### Local job logs (`log.job.dir`)
-
-Set `log.job.dir` to a path and the runner writes a copy of every task's log there as `<start time>-task-<id>.log`: the rows exactly as Gitea received them, with the same secrets masked and the job's result on the last line. Off by default, and what Gitea shows does not change.
-
-#### Secret masking
-
-A job's secrets and its `::add-mask::` values are hidden from what the runner writes and uploads: the job log, the local copy above, job summaries, and the names of the containers it creates. A job output carrying one is skipped with a warning rather than sent masked, as GitHub does, so a downstream `needs.<job>.outputs.<name>` reading it is empty.
-
-`log.job.retention` (default `168h`) is how long a log is kept, expired ones being deleted as new tasks start, and `log.job.max_size` (default `1GB`) caps one log. Keep `retention` above `runner.timeout` so a long job cannot outlive its own log, and prefer local disk, the file is written while the job runs. Only the runner's own user can read it.
-
-### Example Deployments
-
-Check out the [examples](examples) directory for sample deployment types.
+Set `OTEL_EXPORTER_OTLP_ENDPOINT` in the runner's environment to send job traces and runner metrics to an OpenTelemetry collector. See [docs/telemetry.md](docs/telemetry.md).

act/artifactcache/doc.go

@@ -6,7 +6,5 @@
 //
 // Inspired by https://github.com/sp-ricard-valverde/github-act-cache-server
 //
-// TODO: Authorization
-// TODO: Restrictions for accessing a cache, see https://docs.github.com/en/actions/using-workflows/caching-dependencies-to-speed-up-workflows#restrictions-for-accessing-a-cache
 // TODO: Force deleting cache entries, see https://docs.github.com/en/actions/using-workflows/caching-dependencies-to-speed-up-workflows#force-deleting-cache-entries
 package artifactcache

act/artifactcache/handler_v2.go

@@ -15,8 +15,6 @@ import (
 	"strconv"
 	"strings"
 	"time"
-
-	"github.com/julienschmidt/httprouter"
 )
 
 // The cache service v2 API. A client on this version talks twirp to
@@ -39,24 +37,25 @@ const (
 
 	blobUploadURLTTL = time.Hour
 
-	// twirpInternal is the only error code that is not the client's fault.
-	twirpInternal = "internal"
+	twirpInternal        = "internal"
+	twirpUnavailable     = "unavailable"
+	twirpUnauthenticated = "unauthenticated"
 )
 
-func (h *Handler) registerV2Routes(router *httprouter.Router) {
-	router.POST(cacheServiceV2Path+"/CreateCacheEntry", h.bearerAuth(h.v2CreateCacheEntry))
-	router.POST(cacheServiceV2Path+"/FinalizeCacheEntryUpload", h.bearerAuth(h.v2FinalizeCacheEntryUpload))
-	router.POST(cacheServiceV2Path+"/GetCacheEntryDownloadURL", h.bearerAuth(h.v2GetCacheEntryDownloadURL))
-	router.PUT(blobPath+"/:id", h.signedAuth(blobUploadPurpose, h.v2UploadBlob))
+func (h *Handler) registerV2Routes(router *http.ServeMux) {
+	router.HandleFunc("POST "+cacheServiceV2Path+"/CreateCacheEntry", h.bearerAuth(h.v2CreateCacheEntry))
+	router.HandleFunc("POST "+cacheServiceV2Path+"/FinalizeCacheEntryUpload", h.bearerAuth(h.v2FinalizeCacheEntryUpload))
+	router.HandleFunc("POST "+cacheServiceV2Path+"/GetCacheEntryDownloadURL", h.bearerAuth(h.v2GetCacheEntryDownloadURL))
+	router.HandleFunc("PUT "+blobPath+"/{id}", h.signedAuth(blobUploadPurpose, h.v2UploadBlob))
 }
 
 // An entry that already exists is reported as not ok, which is how the client learns to skip
 // the upload.
-func (h *Handler) v2CreateCacheEntry(w http.ResponseWriter, r *http.Request, _ httprouter.Params) {
+func (h *Handler) v2CreateCacheEntry(w http.ResponseWriter, r *http.Request) {
 	cred := credFromContext(r.Context())
 	req, err := decodeTwirpRequest[v2CreateRequest](r)
 	if err != nil {
-		h.twirpError(w, r, "malformed_request", err)
+		h.twirpError(w, r, "malformed", err)
 		return
 	}
 	if req.Key == "" || req.Version == "" {
@@ -74,7 +73,7 @@ func (h *Handler) v2CreateCacheEntry(w http.ResponseWriter, r *http.Request, _ h
 	// An exact (key, version) match means the entry is already cached; the client then skips
 	// the upload. A prefix match must not count here, or a shorter key would be reported as
 	// existing and silently never saved.
-	if existing, err := findExactCache(db, cred.Repo, req.Key, req.Version, true); err != nil {
+	if existing, err := findExactCache(db, cred, req.Key, req.Version, true); err != nil {
 		h.twirpError(w, r, twirpInternal, err)
 		return
 	} else if existing != nil {
@@ -83,16 +82,37 @@ func (h *Handler) v2CreateCacheEntry(w http.ResponseWriter, r *http.Request, _ h
 		return
 	}
 
-	now := time.Now().Unix()
-	cache := &Cache{
-		Repo:      cred.Repo,
-		Key:       req.Key,
-		Version:   req.Version,
-		Size:      -1, // the size is only known at finalize time
-		CreatedAt: now,
-		UsedAt:    now,
+	// A second live reservation is finalized by whichever job calls last, against the other's upload.
+	owner := hashedToken(bearerToken(r))
+	if pending, err := findExactCache(db, cred, req.Key, req.Version, false); err != nil {
+		h.twirpError(w, r, twirpInternal, err)
+		return
+	} else if pending != nil && pending.UsedAt > time.Now().Add(-uploadStallTimeout).Unix() {
+		if pending.Owner != owner {
+			h.twirpNotOK(w, r)
+			return
+		}
+		h.touch(db, pending)                                // still uploading, so it must not go stale under the sweep
+		h.responseJSON(w, r, http.StatusOK, map[string]any{ // this job retrying its own reservation
+			"ok":                true,
+			"signed_upload_url": h.signedURL(cred, blobPath, blobUploadPurpose, pending.ID, time.Now().Add(blobUploadURLTTL)),
+		})
+		return
 	}
-	if err := insertCache(db, cache); err != nil {
+
+	now := time.Now()
+	cache := &Cache{
+		Repo:           cred.Repo,
+		Ref:            cred.Ref,
+		Key:            req.Key,
+		Version:        req.Version,
+		Owner:          owner,
+		Size:           -1, // the size is only known at finalize time
+		CreatedAt:      now.Unix(),
+		CreatedAtNanos: now.Nanosecond(),
+		UsedAt:         now.Unix(),
+	}
+	if err := h.insertCache(db, cache); err != nil {
 		h.twirpError(w, r, twirpInternal, err)
 		return
 	}
@@ -103,11 +123,11 @@ func (h *Handler) v2CreateCacheEntry(w http.ResponseWriter, r *http.Request, _ h
 	})
 }
 
-func (h *Handler) v2FinalizeCacheEntryUpload(w http.ResponseWriter, r *http.Request, _ httprouter.Params) {
+func (h *Handler) v2FinalizeCacheEntryUpload(w http.ResponseWriter, r *http.Request) {
 	cred := credFromContext(r.Context())
 	req, err := decodeTwirpRequest[v2FinalizeRequest](r)
 	if err != nil {
-		h.twirpError(w, r, "malformed_request", err)
+		h.twirpError(w, r, "malformed", err)
 		return
 	}
 
@@ -118,7 +138,14 @@ func (h *Handler) v2FinalizeCacheEntryUpload(w http.ResponseWriter, r *http.Requ
 	}
 	defer db.Close()
 
-	cache, err := findExactCache(db, cred.Repo, req.Key, req.Version, false)
+	cache, err := findExactCache(db, cred, req.Key, req.Version, false)
+	if err == nil && cache != nil && cache.Owner != hashedToken(bearerToken(r)) {
+		cache = nil // not the reservation this job made, so not this job's to commit
+	}
+	if err == nil && cache == nil {
+		// A retry whose first response was lost finds the entry already committed.
+		cache, err = findExactCache(db, cred, req.Key, req.Version, true)
+	}
 	if err != nil {
 		h.twirpError(w, r, twirpInternal, err)
 		return
@@ -127,13 +154,15 @@ func (h *Handler) v2FinalizeCacheEntryUpload(w http.ResponseWriter, r *http.Requ
 		h.twirpNotOK(w, r)
 		return
 	}
-	db.Close() // commitCache needs the store closed
 
-	cache.Size = int64(cmp.Or(req.SizeBytes, req.SizeBytesCamel))
-	if err := h.commitCache(cache); err != nil {
-		h.logger.Errorf("finalize cache %d (%s): %v", cache.ID, cache.Key, err)
-		h.twirpNotOK(w, r)
-		return
+	if !cache.Complete {
+		db.Close() // commitCache needs the store closed
+		cache.Size = int64(cmp.Or(req.SizeBytes, req.SizeBytesCamel))
+		if err := h.commitCache(cache); err != nil {
+			h.logger.Errorf("finalize cache %d (%s): %v", cache.ID, cache.Key, err)
+			h.twirpNotOK(w, r)
+			return
+		}
 	}
 
 	h.responseJSON(w, r, http.StatusOK, map[string]any{
@@ -143,11 +172,11 @@ func (h *Handler) v2FinalizeCacheEntryUpload(w http.ResponseWriter, r *http.Requ
 	})
 }
 
-func (h *Handler) v2GetCacheEntryDownloadURL(w http.ResponseWriter, r *http.Request, _ httprouter.Params) {
+func (h *Handler) v2GetCacheEntryDownloadURL(w http.ResponseWriter, r *http.Request) {
 	cred := credFromContext(r.Context())
 	req, err := decodeTwirpRequest[v2DownloadRequest](r)
 	if err != nil {
-		h.twirpError(w, r, "malformed_request", err)
+		h.twirpError(w, r, "malformed", err)
 		return
 	}
 
@@ -158,7 +187,7 @@ func (h *Handler) v2GetCacheEntryDownloadURL(w http.ResponseWriter, r *http.Requ
 	}
 	defer db.Close()
 
-	cache, err := h.lookupCache(db, cred.Repo, req.keys(), req.Version)
+	cache, err := h.lookupCache(db, cred, req.keys(), req.Version)
 	if err != nil {
 		h.twirpError(w, r, twirpInternal, err)
 		return
@@ -178,8 +207,8 @@ func (h *Handler) v2GetCacheEntryDownloadURL(w http.ResponseWriter, r *http.Requ
 // The archive arrives over the subset of the Azure blob API the toolkit uses: a small
 // cache is a single PUT, a large one is staged as blocks that a final block list puts
 // in order.
-func (h *Handler) v2UploadBlob(w http.ResponseWriter, r *http.Request, params httprouter.Params) {
-	id, err := strconv.ParseUint(params.ByName("id"), 10, 64)
+func (h *Handler) v2UploadBlob(w http.ResponseWriter, r *http.Request) {
+	id, err := strconv.ParseUint(r.PathValue("id"), 10, 64)
 	if err != nil {
 		h.responseJSON(w, r, http.StatusBadRequest, err)
 		return
@@ -230,8 +259,13 @@ func (h *Handler) twirpNotOK(w http.ResponseWriter, r *http.Request) {
 func (h *Handler) twirpError(w http.ResponseWriter, r *http.Request, code string, err error) {
 	h.logger.Debugf("%s %s: %v", r.Method, r.URL.Path, err)
 	status := http.StatusBadRequest
-	if code == twirpInternal {
+	switch code {
+	case twirpInternal:
 		status = http.StatusInternalServerError
+	case twirpUnavailable:
+		status = http.StatusServiceUnavailable
+	case twirpUnauthenticated:
+		status = http.StatusUnauthorized
 	}
 	h.responseJSON(w, r, status, map[string]any{"code": code, "msg": err.Error()})
 }

act/artifactcache/handler_v2_test.go

@@ -10,6 +10,7 @@ import (
 	"fmt"
 	"io"
 	"net/http"
+	"net/url"
 	"strconv"
 	"strings"
 	"testing"
@@ -18,8 +19,6 @@ import (
 	"github.com/stretchr/testify/require"
 )
 
-// v2Call posts a twirp request to the cache service and returns the decoded response.
-// Field names are the proto ones, which is what the toolkit's client sends.
 func v2Call(t *testing.T, handler *Handler, client *http.Client, method string, request any) map[string]any {
 	t.Helper()
 
@@ -36,7 +35,6 @@ func v2Call(t *testing.T, handler *Handler, client *http.Client, method string,
 	return got
 }
 
-// putBlob uploads to a signed URL and returns the status, so a test can assert a refusal.
 func putBlob(t *testing.T, url string, content []byte) int {
 	t.Helper()
 
@@ -46,8 +44,6 @@ func putBlob(t *testing.T, url string, content []byte) int {
 	require.NoError(t, err)
 	defer resp.Body.Close()
 	if resp.StatusCode == http.StatusCreated {
-		// The Azure SDK client dereferences this header without checking, so a blob upload that
-		// omits it panics the caller rather than failing it.
 		require.NotEmpty(t, resp.Header.Get("x-ms-request-id"))
 	}
 	return resp.StatusCode
@@ -66,8 +62,6 @@ func getURL(t *testing.T, url string) []byte {
 	return body
 }
 
-// saveV2 runs the reserve/upload/finalize sequence and returns the finalize response along
-// with the upload URL it used.
 func saveV2(t *testing.T, handler *Handler, key, version string, content []byte) (finalized map[string]any, uploadURL string) {
 	t.Helper()
 
@@ -83,10 +77,8 @@ func saveV2(t *testing.T, handler *Handler, key, version string, content []byte)
 	}), uploadURL
 }
 
-// The whole round trip an actions/cache v2 client makes, plus the guarantees on the signed
-// URLs it is handed: unsigned requests are refused, an upload URL cannot be replayed to read
-// or to replace a finalized entry.
 func TestCacheServiceV2RoundTrip(t *testing.T) {
+	t.Parallel()
 	handler := newTestHandler(t, Policy{})
 	content := []byte("the cached archive")
 
@@ -97,10 +89,8 @@ func TestCacheServiceV2RoundTrip(t *testing.T) {
 	require.Equal(t, true, finalized["ok"])
 	assert.NotEmpty(t, finalized["entry_id"])
 
-	// The upload URL outlives the finalize call, so replaying it must not poison the entry,
-	// and it is an upload URL only: nothing reads a blob back through it.
 	assert.Equal(t, http.StatusBadRequest, putBlob(t, uploadURL, []byte("poisoned")))
-	resp, err := http.Get(uploadURL) //nolint:noctx // the URL is the server under test
+	resp, err := http.Get(uploadURL)
 	require.NoError(t, err)
 	defer resp.Body.Close()
 	assert.Equal(t, http.StatusMethodNotAllowed, resp.StatusCode)
@@ -113,9 +103,8 @@ func TestCacheServiceV2RoundTrip(t *testing.T) {
 	assert.Equal(t, content, getURL(t, downloadURL))
 }
 
-// A large archive is staged as blocks and only put in order by the final block list, so
-// blocks that arrive out of order must still be assembled the way the client asked.
 func TestCacheServiceV2BlockUpload(t *testing.T) {
+	t.Parallel()
 	handler := newTestHandler(t, Policy{})
 
 	created := v2Call(t, handler, testClient, "CreateCacheEntry", map[string]any{"key": "blocks", "version": "v1"})
@@ -129,7 +118,6 @@ func TestCacheServiceV2BlockUpload(t *testing.T) {
 		blocks[blockID] = []byte(part)
 		order = append(order, blockID)
 	}
-	// Upload in an order that is not the block list order.
 	for _, blockID := range []string{order[2], order[0], order[1]} {
 		require.Equal(t, http.StatusCreated, putBlob(t, uploadURL+"&comp=block&blockid="+blockID, blocks[blockID]))
 	}
@@ -141,6 +129,17 @@ func TestCacheServiceV2BlockUpload(t *testing.T) {
 	}
 	list.WriteString(`</BlockList>`)
 	require.Equal(t, http.StatusCreated, putBlob(t, uploadURL+"&comp=blocklist", list.Bytes()))
+	require.Equal(t, http.StatusCreated, putBlob(t, uploadURL+"&comp=blocklist", list.Bytes()),
+		"a client that lost the first answer retries the list it already sent")
+
+	var reordered bytes.Buffer
+	reordered.WriteString(`<?xml version="1.0" encoding="utf-8"?><BlockList>`)
+	for _, blockID := range []string{order[1], order[0], order[2]} {
+		fmt.Fprintf(&reordered, "<Latest>%s</Latest>", blockID)
+	}
+	reordered.WriteString(`</BlockList>`)
+	assert.Equal(t, http.StatusInternalServerError, putBlob(t, uploadURL+"&comp=blocklist", reordered.Bytes()),
+		"the blocks are already assembled, so a different order would silently disagree with them")
 
 	finalized := v2Call(t, handler, testClient, "FinalizeCacheEntryUpload", map[string]any{
 		"key": "blocks", "version": "v1", "size_bytes": len("hello world!"),
@@ -153,6 +152,7 @@ func TestCacheServiceV2BlockUpload(t *testing.T) {
 }
 
 func TestCacheServiceV2Lookups(t *testing.T) {
+	t.Parallel()
 	handler := newTestHandler(t, Policy{})
 	saved, _ := saveV2(t, handler, "deps-abc", "v1", []byte("x"))
 	require.Equal(t, true, saved["ok"])
@@ -162,8 +162,6 @@ func TestCacheServiceV2Lookups(t *testing.T) {
 		assert.Equal(t, false, got["ok"])
 	})
 
-	// The toolkit serialises with the proto field names; the camelCase spellings of the same
-	// proto JSON mapping are accepted alongside them.
 	for _, field := range []string{"restore_keys", "restoreKeys"} {
 		t.Run("restore keys match by prefix, spelled "+field, func(t *testing.T) {
 			got := v2Call(t, handler, testClient, "GetCacheEntryDownloadURL", map[string]any{
@@ -179,9 +177,6 @@ func TestCacheServiceV2Lookups(t *testing.T) {
 		assert.Equal(t, false, again["ok"])
 	})
 
-	// A key that is only a prefix of an existing one is a different entry, so the
-	// reservation check must be exact and not a restore-key prefix match, or the shorter
-	// key would be reported as existing and silently never saved.
 	t.Run("a prefix of an existing key is still reserved", func(t *testing.T) {
 		reserved := v2Call(t, handler, testClient, "CreateCacheEntry", map[string]any{"key": "deps", "version": "v1"})
 		require.Equal(t, true, reserved["ok"])
@@ -207,7 +202,6 @@ func TestCacheServiceV2Lookups(t *testing.T) {
 		assert.Equal(t, false, got["ok"])
 	})
 
-	// The size the client declares is what Commit validates the assembled archive against.
 	t.Run("finalizing with the wrong size is not ok", func(t *testing.T) {
 		created := v2Call(t, handler, testClient, "CreateCacheEntry", map[string]any{"key": "wrong-size", "version": "v1"})
 		require.Equal(t, http.StatusCreated, putBlob(t, created["signed_upload_url"].(string), []byte("four")))
@@ -218,8 +212,6 @@ func TestCacheServiceV2Lookups(t *testing.T) {
 		assert.Equal(t, false, got["ok"])
 	})
 
-	// Both API versions are served from one store, so an entry written through v2 is a hit for
-	// a v1 client asking for the same key and version.
 	t.Run("a v1 client sees an entry written through v2", func(t *testing.T) {
 		resp, err := testClient.Get(fmt.Sprintf("%s%s/cache?keys=deps-abc&version=v1", handler.ExternalURL(), apiPath))
 		require.NoError(t, err)
@@ -232,7 +224,6 @@ func TestCacheServiceV2Lookups(t *testing.T) {
 		assert.NotEmpty(t, got["archiveLocation"])
 	})
 
-	// The cache of one repository must stay invisible to another, as it does for the v1 API.
 	t.Run("another repository sees nothing", func(t *testing.T) {
 		handler.RegisterJob("other-runtime-token", JobCredential{Repo: "other/repo"})
 		otherClient := &http.Client{Transport: &bearerTransport{token: "other-runtime-token"}}
@@ -240,4 +231,114 @@ func TestCacheServiceV2Lookups(t *testing.T) {
 		got := v2Call(t, handler, otherClient, "GetCacheEntryDownloadURL", map[string]any{"key": "deps-abc", "version": "v1"})
 		assert.Equal(t, false, got["ok"])
 	})
+
+	t.Run("each ref saves and restores its own entry for the same key", func(t *testing.T) {
+		clients := map[string]*http.Client{"x": testClient}
+		for _, ref := range []string{"y", "z"} {
+			handler.RegisterJob(ref, JobCredential{Repo: testRepo, Ref: "refs/pull/" + ref + "/head"})
+			clients[ref] = &http.Client{Transport: &bearerTransport{token: ref}}
+			created := v2Call(t, handler, clients[ref], "CreateCacheEntry", map[string]any{"key": "deps-abc", "version": "v1"})
+			require.Equal(t, true, created["ok"])
+			require.Equal(t, http.StatusCreated, putBlob(t, created["signed_upload_url"].(string), []byte(ref)))
+		}
+		for _, ref := range []string{"y", "z"} {
+			require.Equal(t, true, v2Call(t, handler, clients[ref], "FinalizeCacheEntryUpload", map[string]any{"key": "deps-abc", "version": "v1", "size_bytes": 1})["ok"])
+		}
+		for content, client := range clients {
+			got := v2Call(t, handler, client, "GetCacheEntryDownloadURL", map[string]any{"key": "deps-abc", "version": "v1"})
+			assert.Equal(t, content, string(getURL(t, got["signed_download_url"].(string))))
+		}
+	})
+}
+
+func TestCacheServiceV2RefusalsAreTwirp(t *testing.T) {
+	t.Parallel()
+	handler := newTestHandler(t, Policy{})
+
+	tests := []struct {
+		name   string
+		token  string
+		body   string
+		status int
+		code   string
+	}{
+		{"no bearer at all", "", `{"key":"k","version":"v"}`, http.StatusUnauthorized, twirpUnauthenticated},
+		{"a bearer nobody registered", "not-a-job", `{"key":"k","version":"v"}`, http.StatusUnauthorized, twirpUnauthenticated},
+		{"a body that is not the request", testToken, `{`, http.StatusBadRequest, "malformed"},
+		{"a request missing its key", testToken, `{"version":"v"}`, http.StatusBadRequest, "invalid_argument"},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			req, err := http.NewRequestWithContext(t.Context(), http.MethodPost,
+				handler.ExternalURL()+cacheServiceV2Path+"/CreateCacheEntry", strings.NewReader(tt.body))
+			require.NoError(t, err)
+			if tt.token != "" {
+				req.Header.Set("Authorization", "Bearer "+tt.token)
+			}
+			resp, err := http.DefaultClient.Do(req)
+			require.NoError(t, err)
+			defer resp.Body.Close()
+
+			require.Equal(t, tt.status, resp.StatusCode)
+			got := map[string]string{}
+			require.NoError(t, json.UnmarshalRead(resp.Body, &got))
+			assert.Equal(t, tt.code, got["code"])
+			assert.NotEmpty(t, got["msg"])
+		})
+	}
+}
+
+func TestCacheServiceV2ConcurrentSaveAndRetries(t *testing.T) {
+	t.Parallel()
+	handler := newTestHandler(t, Policy{})
+	content := []byte("the cached archive")
+
+	const otherJob = "another-jobs-token"
+	defer handler.RegisterJob(otherJob, JobCredential{Repo: testRepo})()
+	reserve := func(client *http.Client) map[string]any {
+		return v2Call(t, handler, client, "CreateCacheEntry", map[string]any{"key": "shared", "version": "v1"})
+	}
+	first := reserve(testClient)
+	require.Equal(t, true, first["ok"])
+	retry := reserve(testClient)
+	assert.Equal(t, true, retry["ok"], "a job retrying its own reservation is not a conflict")
+	entryOf := func(reserved map[string]any) string {
+		parsed, err := url.Parse(reserved["signed_upload_url"].(string))
+		require.NoError(t, err)
+		return parsed.Path
+	}
+	assert.Equal(t, entryOf(first), entryOf(retry), "the same reservation, however freshly its URL is signed")
+	assert.Equal(t, false, reserve(&http.Client{Transport: &bearerTransport{token: otherJob}})["ok"],
+		"another job's reservation would be finalized against the first upload")
+
+	otherClient := &http.Client{Transport: &bearerTransport{token: otherJob}}
+	reserved := v2Call(t, handler, otherClient, "CreateCacheEntry", map[string]any{"key": "owned", "version": "v1"})
+	require.Equal(t, true, reserved["ok"])
+	require.Equal(t, http.StatusCreated, putBlob(t, reserved["signed_upload_url"].(string), content))
+	assert.Equal(t, false, v2Call(t, handler, testClient, "FinalizeCacheEntryUpload",
+		map[string]any{"key": "owned", "version": "v1", "size_bytes": strconv.Itoa(len(content))})["ok"],
+		"another job's upload is not this job's to finalize")
+
+	base := handler.ExternalURL() + apiPath
+	madeByV1 := reserveCache(t, testClient, base, "v1-made", "v1", int64(len(content)))
+	upload, err := http.NewRequestWithContext(t.Context(), http.MethodPatch,
+		fmt.Sprintf("%s/caches/%d", base, madeByV1), bytes.NewReader(content))
+	require.NoError(t, err)
+	upload.Header.Set("Content-Range", fmt.Sprintf("bytes 0-%d/*", len(content)-1))
+	resp, err := testClient.Do(upload)
+	require.NoError(t, err)
+	resp.Body.Close()
+	require.Equal(t, http.StatusOK, resp.StatusCode)
+
+	assert.Equal(t, false, v2Call(t, handler, testClient, "FinalizeCacheEntryUpload",
+		map[string]any{"key": "v1-made", "version": "v1", "size_bytes": strconv.Itoa(len(content))})["ok"],
+		"a reservation this job did not make through v2 is not its to commit")
+
+	finalized, _ := saveV2(t, handler, "deps", "v1", content)
+	require.Equal(t, true, finalized["ok"])
+	again := v2Call(t, handler, testClient, "FinalizeCacheEntryUpload", map[string]any{
+		"key": "deps", "version": "v1", "size_bytes": strconv.Itoa(len(content)),
+	})
+	assert.Equal(t, true, again["ok"], "a retry whose first answer was lost must not report a failed save")
+	assert.Equal(t, finalized["entry_id"], again["entry_id"])
 }

act/artifactcache/model.go

@@ -4,6 +4,8 @@
 
 package artifactcache
 
+import "time"
+
 type Request struct {
 	Key     string `json:"key" `
 	Version string `json:"version"`
@@ -11,12 +13,19 @@ type Request struct {
 }
 
 type Cache struct {
-	ID        uint64 `json:"id" boltholdKey:"ID"`
-	Repo      string `json:"repo" boltholdIndex:"Repo"`
-	Key       string `json:"key" boltholdIndex:"Key"`
-	Version   string `json:"version" boltholdIndex:"Version"`
-	Size      int64  `json:"cacheSize"`
-	Complete  bool   `json:"complete" boltholdIndex:"Complete"`
-	UsedAt    int64  `json:"usedAt" boltholdIndex:"UsedAt"`
-	CreatedAt int64  `json:"createdAt" boltholdIndex:"CreatedAt"`
+	ID             uint64 `json:"id"`
+	Repo           string `json:"repo"`
+	Ref            string `json:"ref,omitzero"`
+	Key            string `json:"key"`
+	Version        string `json:"version"`
+	Size           int64  `json:"cacheSize"`
+	Owner          string `json:"owner"` // hashed bearer, so a job's own retry is not another job's reservation
+	Complete       bool   `json:"complete"`
+	UsedAt         int64  `json:"usedAt"`
+	CreatedAt      int64  `json:"createdAt"`
+	CreatedAtNanos int    `json:"createdAtNanos,omitzero"`
+}
+
+func (cache *Cache) createdAtNano() int64 {
+	return cache.CreatedAt*int64(time.Second) + int64(cache.CreatedAtNanos)
 }

act/artifactcache/results.go

@@ -4,7 +4,10 @@
 package artifactcache
 
 import (
+	"cmp"
 	"crypto/tls"
+	"errors"
+	"fmt"
 	"net/http"
 	"net/http/httputil"
 	"net/url"
@@ -15,23 +18,38 @@ import (
 // Gitea implements only the artifact half of it. Forwarding that half from here makes this origin
 // the whole service, so ACTIONS_RESULTS_URL can point at it truthfully, which is what the clients
 // this runner cannot patch need, docker buildx among them.
-//
-// The instance to forward to travels with the job registration rather than with configuration, so
-// a cache server shared between runners serves each of their instances.
 const artifactServicePath = "/twirp/github.actions.results.api.v1.ArtifactService/"
 
 // forwardOrNotFound is the router's fallback: the artifact service of the instance the job
 // registered with, and the 404 the router would have written otherwise.
 func (h *Handler) forwardOrNotFound(w http.ResponseWriter, r *http.Request) {
-	cred, ok := h.lookupCredential(bearerToken(r))
-	if !ok || cred.Results == "" || !strings.HasPrefix(r.URL.Path, artifactServicePath) {
+	if !strings.HasPrefix(r.URL.Path, artifactServicePath) {
 		http.NotFound(w, r)
 		return
 	}
+	cred, ok := h.lookupCredential(bearerToken(r))
+	if !ok {
+		h.twirpError(w, r, twirpUnauthenticated, errors.New("unknown bearer token"))
+		return
+	}
+	if cred.Results == "" {
+		h.twirpError(w, r, twirpInternal, errors.New("no instance is registered for this job"))
+		return
+	}
 	target, err := url.Parse(strings.TrimSuffix(cred.Results, "/"))
+	if err == nil && (target.Hostname() == "" || (target.Scheme != "http" && target.Scheme != "https")) {
+		err = errors.New("not an absolute http or https URL the job could use")
+	}
 	if err != nil {
 		h.logger.Errorf("artifact service forward to %q: %v", cred.Results, err)
-		w.WriteHeader(http.StatusBadGateway)
+		h.twirpError(w, r, twirpInternal, fmt.Errorf("artifact service address %q is unusable: %w", cred.Results, err))
+		return
+	}
+	if !h.mustProxy(r, cred, target) {
+		redirect := target.JoinPath(r.URL.EscapedPath())
+		redirect.RawQuery = mergeQuery(target.RawQuery, r.URL.RawQuery)
+		h.logger.Debugf("%s %s: redirecting to %s", r.Method, r.URL.Path, target)
+		http.Redirect(w, r, redirect.String(), http.StatusTemporaryRedirect)
 		return
 	}
 	h.logger.Debugf("%s %s: forwarding to %s", r.Method, r.URL.Path, target)
@@ -44,9 +62,9 @@ func (h *Handler) forwardOrNotFound(w http.ResponseWriter, r *http.Request) {
 			// directly and never through here.
 			r.Out.Host = target.Host
 		},
-		ErrorHandler: func(w http.ResponseWriter, _ *http.Request, err error) {
+		ErrorHandler: func(w http.ResponseWriter, r *http.Request, err error) {
 			h.logger.Warnf("artifact service forward to %s: %v", target, err)
-			w.WriteHeader(http.StatusBadGateway)
+			h.twirpError(w, r, twirpInternal, fmt.Errorf("cache server cannot reach the artifact service at %s: %w", target, err))
 		},
 	}
 	if cred.InsecureTLS {
@@ -55,5 +73,17 @@ func (h *Handler) forwardOrNotFound(w http.ResponseWriter, r *http.Request) {
 	proxy.ServeHTTP(w, r)
 }
 
+// A protocol switch loses the bearer or the agent, and an untrusted instance needs skipped verification.
+func (h *Handler) mustProxy(r *http.Request, cred JobCredential, target *url.URL) bool {
+	return cred.InsecureTLS && target.Scheme == "https" || cmp.Or(r.Header.Get("X-Forwarded-Proto"), "http") != target.Scheme
+}
+
+func mergeQuery(target, request string) string {
+	if target == "" || request == "" {
+		return target + request
+	}
+	return target + "&" + request
+}
+
 // insecureTransport is shared, because a transport per request would pool no connections.
-var insecureTransport = &http.Transport{TLSClientConfig: &tls.Config{InsecureSkipVerify: true}} //nolint:gosec // the runner reaches its instance on the operator's say-so
+var insecureTransport = &http.Transport{Proxy: http.ProxyFromEnvironment, TLSClientConfig: &tls.Config{InsecureSkipVerify: true}} //nolint:gosec // the runner reaches its instance on the operator's say-so

act/artifactcache/results_test.go

@@ -4,6 +4,8 @@
 package artifactcache
 
 import (
+	"cmp"
+	"encoding/json/v2"
 	"io"
 	"net/http"
 	"net/http/httptest"
@@ -14,43 +16,120 @@ import (
 	"github.com/stretchr/testify/require"
 )
 
-// The artifact half is forwarded under the Host Gitea knows itself by, so the URLs it hands back
-// still point at Gitea, and nothing else is proxied.
 func TestFrontResultsService(t *testing.T) {
+	t.Parallel()
 	var gotHost, gotPath, gotProto string
 	gitea := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		gotHost, gotPath, gotProto = r.Host, r.URL.Path, r.Header.Get("X-Forwarded-Proto")
 		_, _ = io.WriteString(w, `{"ok":true}`)
 	}))
 	defer gitea.Close()
+	selfSigned := httptest.NewTLSServer(gitea.Config.Handler)
+	defer selfSigned.Close()
 
 	handler, err := StartHandler(Options{Dir: t.TempDir(), OutboundIP: "127.0.0.1"})
 	require.NoError(t, err)
 	defer handler.Close()
-	const token = "forward-token"
+	const token, rpc = "forward-token", artifactServicePath + "CreateArtifact"
 
-	client := &http.Client{Transport: &bearerTransport{token: token}}
-	post := func(path string) int {
+	noRedirect := func(token string) *http.Client {
+		return &http.Client{
+			Transport:     &bearerTransport{token: token},
+			CheckRedirect: func(*http.Request, []*http.Request) error { return http.ErrUseLastResponse },
+		}
+	}
+	post := func(path string) (int, map[string]string) {
 		req, err := http.NewRequestWithContext(t.Context(), http.MethodPost, handler.ExternalURL()+path, nil)
 		require.NoError(t, err)
-		resp, err := client.Do(req)
+		resp, err := noRedirect(token).Do(req)
 		require.NoError(t, err)
-		resp.Body.Close()
-		return resp.StatusCode
+		defer resp.Body.Close()
+		body := map[string]string{}
+		_ = json.UnmarshalRead(resp.Body, &body)
+		return resp.StatusCode, body
 	}
 
-	assert.Equal(t, http.StatusNotFound, post(artifactServicePath+"CreateArtifact"),
-		"an unregistered token is forwarded nowhere")
+	status, body := post(rpc)
+	assert.Equal(t, http.StatusUnauthorized, status, "an unregistered token is told so, not left to parse a 404 page")
+	assert.Equal(t, twirpUnauthenticated, body["code"])
+	assert.Contains(t, body["msg"], "bearer")
+	assert.NotEmpty(t, body["msg"])
 
-	defer handler.RegisterJob(token, JobCredential{Repo: "owner/repo", Results: gitea.URL})()
+	defer handler.RegisterJob(token, JobCredential{Repo: "owner/repo", Results: selfSigned.URL, InsecureTLS: true})()
 
-	assert.Equal(t, http.StatusOK, post(artifactServicePath+"CreateArtifact"))
-	assert.Equal(t, strings.TrimPrefix(gitea.URL, "http://"), gotHost, "Gitea must see the host it mints its URLs from")
+	status, _ = post(rpc)
+	require.Equal(t, http.StatusOK, status, "an http job reaching an https instance must proxy")
+	assert.Equal(t, strings.TrimPrefix(selfSigned.URL, "https://"), gotHost, "Gitea must see the host it mints its URLs from")
 	assert.Empty(t, gotProto, "a forwarded scheme would make an https Gitea mint http URLs")
-	assert.Equal(t, artifactServicePath+"CreateArtifact", gotPath)
+	assert.Equal(t, rpc, gotPath)
 
 	gotPath = ""
-	assert.Equal(t, http.StatusNotFound, post("/twirp/github.actions.results.api.v1.OtherService/Do"))
-	assert.Equal(t, http.StatusNotFound, post("/api/v1/repos/owner/repo"))
+	status, _ = post("/twirp/github.actions.results.api.v1.OtherService/Do")
+	assert.Equal(t, http.StatusNotFound, status)
+	status, _ = post("/api/v1/repos/owner/repo")
+	assert.Equal(t, http.StatusNotFound, status)
 	assert.Empty(t, gotPath, "only the artifact service is forwarded")
+
+	tests := []struct {
+		name           string
+		cred           JobCredential
+		forwardedProto string
+		reqQuery       string
+		want           int
+		location       string
+		wantMsg        string
+	}{
+		{name: "an instance the job reaches itself", cred: JobCredential{Results: gitea.URL}, want: http.StatusTemporaryRedirect},
+		{name: "a sub-path instance keeps its prefix", cred: JobCredential{Results: gitea.URL + "/sub"}, want: http.StatusTemporaryRedirect},
+		{name: "an instance with no certificate to distrust", cred: JobCredential{Results: gitea.URL, InsecureTLS: true}, want: http.StatusTemporaryRedirect},
+		{
+			name: "both queries survive", cred: JobCredential{Results: gitea.URL + "?tenant=one"}, reqQuery: "?run=7",
+			want: http.StatusTemporaryRedirect, location: gitea.URL + rpc + "?tenant=one&run=7",
+		},
+		{
+			name: "a trusted https instance is reached by the job itself",
+			cred: JobCredential{Results: selfSigned.URL}, forwardedProto: "https", want: http.StatusTemporaryRedirect,
+		},
+		{
+			name: "the job does not share this server's disregard for the certificate",
+			cred: JobCredential{Results: selfSigned.URL, InsecureTLS: true}, forwardedProto: "https", want: http.StatusOK,
+		},
+		{name: "an http job is not redirected to an https instance", cred: JobCredential{Results: selfSigned.URL}, want: http.StatusInternalServerError},
+		{
+			name: "a forwarded https scheme onto an http instance is proxied",
+			cred: JobCredential{Results: gitea.URL}, forwardedProto: "https", want: http.StatusOK,
+		},
+		{
+			name: "a scheme the job could not use is refused before it is sent one",
+			cred: JobCredential{Results: "ftp://gitea.example"}, want: http.StatusInternalServerError, wantMsg: "unusable",
+		},
+		{
+			name: "an address with no host is refused before it is sent one",
+			cred: JobCredential{Results: "http://:3000"}, want: http.StatusInternalServerError, wantMsg: "unusable",
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			defer handler.RegisterJob(tt.name, tt.cred)()
+			req, err := http.NewRequestWithContext(t.Context(), http.MethodPost, handler.ExternalURL()+rpc+tt.reqQuery, nil)
+			require.NoError(t, err)
+			if tt.forwardedProto != "" {
+				req.Header.Set("X-Forwarded-Proto", tt.forwardedProto)
+			}
+			resp, err := noRedirect(tt.name).Do(req)
+			require.NoError(t, err)
+			defer resp.Body.Close()
+
+			require.Equal(t, tt.want, resp.StatusCode)
+			switch tt.want {
+			case http.StatusTemporaryRedirect:
+				assert.Equal(t, cmp.Or(tt.location, tt.cred.Results+rpc), resp.Header.Get("Location"))
+			case http.StatusInternalServerError:
+				body := map[string]string{}
+				require.NoError(t, json.UnmarshalRead(resp.Body, &body))
+				assert.Equal(t, twirpInternal, body["code"])
+				assert.Contains(t, body["msg"], cmp.Or(tt.wantMsg, tt.cred.Results))
+			}
+		})
+	}
 }

act/artifactcache/s3_storage.go

@@ -0,0 +1,348 @@
+// Copyright 2026 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package artifactcache
+
+import (
+	"bytes"
+	"cmp"
+	"context"
+	"crypto/hmac"
+	"crypto/sha256"
+	"encoding/json/v2"
+	"encoding/xml"
+	"errors"
+	"fmt"
+	"io"
+	"io/fs"
+	"maps"
+	"net/http"
+	"net/url"
+	"os"
+	"path"
+	"slices"
+	"strconv"
+	"strings"
+	"time"
+
+	"gitea.com/gitea/runner/act/common"
+
+	"golang.org/x/sync/errgroup"
+)
+
+// S3Options configures the bucket that stores completed cache entries.
+type S3Options struct {
+	Endpoint  string
+	Region    string
+	Bucket    string
+	Prefix    string
+	PathStyle *bool // nil uses virtual-hosted requests on AWS and path-style ones elsewhere
+	AccessKey string
+	SecretKey string
+}
+
+type cacheStorage interface {
+	Exist(uint64) (bool, error)
+	Write(uint64, int64, io.Reader) error
+	WriteBlock(uint64, string, io.Reader) error
+	OrderBlocks(uint64, []string) error
+	Commit(uint64, int64) (int64, error)
+	Serve(http.ResponseWriter, *http.Request, uint64)
+	Remove(uint64) error
+}
+
+const s3PartSize = 64 << 20
+
+// s3Storage stages uploads on disk and keeps completed entries and their metadata in a bucket.
+type s3Storage struct {
+	*Storage
+	client    *http.Client
+	bucketURL *url.URL
+	opts      S3Options
+}
+
+type s3Part struct {
+	PartNumber int
+	ETag       string
+}
+
+func newS3Storage(staging *Storage, opts S3Options) (*s3Storage, error) {
+	endpoint, err := url.Parse(opts.Endpoint)
+	if err != nil || endpoint.Host == "" || (endpoint.Scheme != "http" && endpoint.Scheme != "https") {
+		return nil, fmt.Errorf("invalid S3 endpoint %q", opts.Endpoint)
+	}
+	transport, _ := http.DefaultTransport.(*http.Transport)
+	transport = transport.Clone()
+	transport.MaxIdleConnsPerHost = 32            // 4 parts each for the 8 jobs a runner commonly runs
+	transport.ResponseHeaderTimeout = time.Minute // a stalled endpoint must not hold the store forever
+	pathStyle := !strings.HasSuffix(endpoint.Hostname(), ".amazonaws.com")
+	if opts.PathStyle != nil {
+		pathStyle = *opts.PathStyle
+	}
+	if pathStyle {
+		endpoint.Path = "/" + opts.Bucket
+	} else {
+		endpoint.Host = opts.Bucket + "." + endpoint.Host
+		endpoint.Path = "/"
+	}
+	opts.Region = cmp.Or(opts.Region, "us-east-1")
+	return &s3Storage{Storage: staging, client: &http.Client{Transport: transport}, bucketURL: endpoint, opts: opts}, nil
+}
+
+func (s *s3Storage) blobKey(id uint64) string {
+	return path.Join(s.opts.Prefix, "blobs", strconv.FormatUint(id, 10))
+}
+
+func (s *s3Storage) metadataDir() string {
+	return path.Join(s.opts.Prefix, "metadata") + "/"
+}
+
+func (s *s3Storage) metadataKey(id uint64) string {
+	return s.metadataDir() + strconv.FormatUint(id, 10) + ".json"
+}
+
+func (s *s3Storage) url(key string, query url.Values) *url.URL {
+	u := *s.bucketURL
+	u.Path = path.Join(u.Path, key)
+	u.RawPath = strings.NewReplacer("+", "%20", "%2F", "/").Replace(url.QueryEscape(u.Path)) // SigV4 encoding
+	u.RawQuery = strings.ReplaceAll(query.Encode(), "+", "%20")
+	return &u
+}
+
+// sign authorizes req with AWS Signature Version 4, leaving the payload unsigned so bodies can stream.
+// https://docs.aws.amazon.com/AmazonS3/latest/API/sig-v4-header-based-auth.html
+func (s *s3Storage) sign(req *http.Request, now time.Time) {
+	date := now.UTC().Format("20060102T150405Z")
+	req.Header.Set("X-Amz-Date", date)
+	if req.Header.Get("X-Amz-Content-Sha256") == "" {
+		req.Header.Set("X-Amz-Content-Sha256", "UNSIGNED-PAYLOAD")
+	}
+	headers := map[string]string{"host": req.URL.Host}
+	for name, values := range req.Header {
+		if name = strings.ToLower(name); strings.HasPrefix(name, "x-amz-") {
+			headers[name] = strings.Join(values, ",")
+		}
+	}
+	names := slices.Sorted(maps.Keys(headers))
+	canonical := []string{req.Method, req.URL.EscapedPath(), req.URL.RawQuery}
+	for _, name := range names {
+		canonical = append(canonical, name+":"+headers[name])
+	}
+	canonical = append(canonical, "", strings.Join(names, ";"), req.Header.Get("X-Amz-Content-Sha256"))
+	scope := date[:8] + "/" + s.opts.Region + "/s3/aws4_request"
+	signature := []byte("AWS4" + s.opts.SecretKey)
+	for _, data := range []string{date[:8], s.opts.Region, "s3", "aws4_request", fmt.Sprintf("AWS4-HMAC-SHA256\n%s\n%s\n%x", date, scope, sha256.Sum256([]byte(strings.Join(canonical, "\n"))))} { // key derivation, the last round signs
+		mac := hmac.New(sha256.New, signature)
+		_, _ = mac.Write([]byte(data))
+		signature = mac.Sum(nil)
+	}
+	req.Header.Set("Authorization", fmt.Sprintf("AWS4-HMAC-SHA256 Credential=%s/%s,SignedHeaders=%s,Signature=%x", s.opts.AccessKey, scope, strings.Join(names, ";"), signature))
+}
+
+// do returns the response to a signed request when it succeeded, fs.ErrNotExist for a missing key.
+func (s *s3Storage) do(ctx context.Context, method, key string, query url.Values, header http.Header, body io.Reader) (*http.Response, error) {
+	var size int64
+	if sized, ok := body.(interface{ Size() int64 }); ok {
+		size = sized.Size()
+	}
+	if size == 0 {
+		body = nil
+	}
+	req, err := http.NewRequestWithContext(ctx, method, s.url(key, query).String(), body)
+	if err != nil {
+		return nil, err
+	}
+	req.ContentLength = size
+	maps.Copy(req.Header, header)
+	s.sign(req, time.Now())
+	resp, err := s.client.Do(req)
+	if err != nil {
+		return nil, err
+	}
+	if resp.StatusCode < http.StatusMultipleChoices {
+		return resp, nil
+	}
+	defer drain(resp)
+	var failure struct{ Code, Message string }
+	_ = xml.NewDecoder(resp.Body).Decode(&failure)
+	if resp.StatusCode == http.StatusNotFound && (failure.Code == "NoSuchKey" || failure.Code == "" && method == http.MethodHead) {
+		return nil, fs.ErrNotExist
+	}
+	return nil, fmt.Errorf("S3 %s %s: %s", method, key, cmp.Or(strings.TrimSpace(failure.Code+" "+failure.Message), resp.Status))
+}
+
+func (s *s3Storage) call(ctx context.Context, method, key string, query url.Values, body io.Reader, result any) (http.Header, error) {
+	resp, err := s.do(ctx, method, key, query, nil, body)
+	if err != nil {
+		return nil, err
+	}
+	defer drain(resp)
+	if result == nil {
+		return resp.Header, nil
+	}
+	return resp.Header, xml.NewDecoder(resp.Body).Decode(result)
+}
+
+// drain reads a response to its end before closing it, so its connection gets reused.
+func drain(resp *http.Response) {
+	_, _ = io.Copy(io.Discard, resp.Body)
+	_ = resp.Body.Close()
+}
+
+func (s *s3Storage) Exist(id uint64) (bool, error) {
+	_, err := s.call(context.Background(), http.MethodHead, s.blobKey(id), nil, nil, nil)
+	if errors.Is(err, fs.ErrNotExist) {
+		return false, nil
+	}
+	return err == nil, err
+}
+
+func (s *s3Storage) Commit(id uint64, size int64) (int64, error) {
+	written, err := s.Storage.Commit(id, size)
+	if err != nil {
+		return 0, err
+	}
+	defer func() { _ = s.Storage.Remove(id) }()
+	file, err := os.Open(s.filename(id))
+	if err != nil {
+		return 0, err
+	}
+	defer file.Close()
+	if err := s.upload(context.Background(), s.blobKey(id), file, written); err != nil {
+		return 0, fmt.Errorf("upload cache to S3: %w", err)
+	}
+	return written, nil
+}
+
+func (s *s3Storage) upload(ctx context.Context, key string, file io.ReaderAt, size int64) (uploadErr error) {
+	if size <= s3PartSize {
+		_, err := s.call(ctx, http.MethodPut, key, nil, io.NewSectionReader(file, 0, size), nil)
+		return err
+	}
+	var created struct {
+		UploadID string `xml:"UploadId"`
+	}
+	if _, err := s.call(ctx, http.MethodPost, key, url.Values{"uploads": {""}}, nil, &created); err != nil {
+		return err
+	}
+	defer func() {
+		if uploadErr != nil && created.UploadID != "" {
+			abortCtx, cancel := context.WithTimeout(context.WithoutCancel(ctx), time.Minute)
+			defer cancel()
+			_, _ = s.call(abortCtx, http.MethodDelete, key, url.Values{"uploadId": {created.UploadID}}, nil, nil)
+		}
+	}()
+	var completion struct {
+		XMLName xml.Name `xml:"CompleteMultipartUpload"`
+		Parts   []s3Part `xml:"Part"`
+	}
+	partSize := max(int64(s3PartSize), (size-1)/10000+1)
+	completion.Parts = make([]s3Part, (size-1)/partSize+1)
+	workers, workerCtx := errgroup.WithContext(ctx)
+	workers.SetLimit(4)
+	for part := range completion.Parts {
+		workers.Go(func() (err error) {
+			defer common.RecoverPanic(&err)
+			offset := int64(part) * partSize
+			header, err := s.call(workerCtx, http.MethodPut, key, url.Values{"partNumber": {strconv.Itoa(part + 1)}, "uploadId": {created.UploadID}}, io.NewSectionReader(file, offset, min(partSize, size-offset)), nil)
+			completion.Parts[part] = s3Part{part + 1, header.Get("ETag")}
+			return err
+		})
+	}
+	if err := workers.Wait(); err != nil {
+		return err
+	}
+	body, err := xml.Marshal(completion)
+	if err != nil {
+		return err
+	}
+	var result struct{ Code, Message string } // a completion can fail after its 200 status
+	if _, err := s.call(ctx, http.MethodPost, key, url.Values{"uploadId": {created.UploadID}}, bytes.NewReader(body), &result); err != nil {
+		return err
+	}
+	if result.Code != "" {
+		return fmt.Errorf("S3 complete upload %s: %s %s", key, result.Code, result.Message)
+	}
+	return nil
+}
+
+func (s *s3Storage) Serve(w http.ResponseWriter, r *http.Request, id uint64) {
+	header := http.Header{}
+	if byteRange := r.Header.Get("Range"); byteRange != "" {
+		header.Set("Range", byteRange)
+	}
+	resp, err := s.do(r.Context(), http.MethodGet, s.blobKey(id), nil, header, nil)
+	if errors.Is(err, fs.ErrNotExist) {
+		http.NotFound(w, r)
+		return
+	} else if err != nil {
+		http.Error(w, "read cache from S3", http.StatusBadGateway)
+		return
+	}
+	defer resp.Body.Close()
+	for _, name := range []string{"Content-Length", "Content-Range"} {
+		if value := resp.Header.Get(name); value != "" {
+			w.Header().Set(name, value)
+		}
+	}
+	w.WriteHeader(resp.StatusCode)
+	_, _ = io.Copy(w, resp.Body)
+}
+
+// Remove unpublishes an entry before deleting its blob, so no runner imports it without its bytes.
+func (s *s3Storage) Remove(id uint64) error {
+	for _, key := range []string{s.metadataKey(id), s.blobKey(id)} {
+		if _, err := s.call(context.Background(), http.MethodDelete, key, nil, nil, nil); err != nil && !errors.Is(err, fs.ErrNotExist) {
+			return fmt.Errorf("remove %s from S3: %w", key, err)
+		}
+	}
+	return s.Storage.Remove(id)
+}
+
+func (s *s3Storage) publish(cache *Cache) error {
+	data, err := json.Marshal(cache)
+	if err != nil {
+		return err
+	}
+	if _, err := s.call(context.Background(), http.MethodPut, s.metadataKey(cache.ID), nil, bytes.NewReader(data), nil); err != nil {
+		return fmt.Errorf("publish cache to S3: %w", err)
+	}
+	return nil
+}
+
+func (s *s3Storage) published(ctx context.Context) (map[uint64]bool, error) {
+	ids := make(map[uint64]bool)
+	query := url.Values{"list-type": {"2"}, "prefix": {s.metadataDir()}}
+	for {
+		var page struct {
+			Contents              []struct{ Key string }
+			IsTruncated           bool
+			NextContinuationToken string
+		}
+		if _, err := s.call(ctx, http.MethodGet, "", query, nil, &page); err != nil {
+			return nil, fmt.Errorf("list S3 cache metadata: %w", err)
+		}
+		for _, object := range page.Contents {
+			if id, err := strconv.ParseUint(strings.TrimSuffix(strings.TrimPrefix(object.Key, s.metadataDir()), ".json"), 10, 64); err == nil {
+				ids[id] = true
+			}
+		}
+		if !page.IsTruncated {
+			return ids, nil
+		}
+		query.Set("continuation-token", page.NextContinuationToken)
+	}
+}
+
+func (s *s3Storage) fetch(ctx context.Context, id uint64) (*Cache, error) {
+	resp, err := s.do(ctx, http.MethodGet, s.metadataKey(id), nil, nil, nil)
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+	cache := &Cache{}
+	if err := json.UnmarshalRead(resp.Body, cache); err != nil {
+		return nil, fmt.Errorf("read S3 cache metadata %d: %w", id, err)
+	}
+	return cache, nil
+}

act/artifactcache/s3_storage_test.go

@@ -0,0 +1,141 @@
+// Copyright 2026 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package artifactcache
+
+import (
+	"encoding/xml"
+	"io"
+	"net/http"
+	"net/http/httptest"
+	"strconv"
+	"strings"
+	"sync"
+	"sync/atomic"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestHandler_S3SharesEntriesAndDropsExpiredOnes(t *testing.T) {
+	t.Parallel()
+	var objects sync.Map
+	var uploads atomic.Int32
+	server := httptest.NewServer(http.HandlerFunc(func(writer http.ResponseWriter, request *http.Request) {
+		key := strings.TrimPrefix(request.URL.Path, "/cache/")
+		switch {
+		case request.Method == http.MethodPut:
+			if strings.Contains(key, "/blobs/") {
+				uploads.Add(1)
+			}
+			body, err := io.ReadAll(request.Body)
+			assert.NoError(t, err)
+			objects.Store(key, body)
+		case request.URL.Query().Has("list-type"):
+			_, _ = io.WriteString(writer, "<ListBucketResult>")
+			objects.Range(func(stored, _ any) bool {
+				_, _ = io.WriteString(writer, "<Contents><Key>"+stored.(string)+"</Key></Contents>")
+				return true
+			})
+			_, _ = io.WriteString(writer, "</ListBucketResult>")
+		default:
+			if body, ok := objects.Load(key); ok {
+				_, _ = writer.Write(body.([]byte))
+			} else {
+				writer.WriteHeader(http.StatusNotFound)
+			}
+		}
+	}))
+	t.Cleanup(server.Close)
+	opts := Options{S3: &S3Options{Endpoint: server.URL, Bucket: "cache", Prefix: "runners", AccessKey: "key", SecretKey: "secret"}}
+	saver, restorer := startTestHandler(t, opts), startTestHandler(t, opts)
+	entry := map[string]any{"key": "deps", "version": "v1"}
+
+	started := time.Now()
+	finalized, _ := saveV2(t, saver, "deps", "v1", []byte("archive"))
+	require.Equal(t, true, finalized["ok"])
+	assert.EqualValues(t, 1, uploads.Load())
+	id, err := strconv.ParseUint(finalized["entry_id"].(string), 10, 64)
+	require.NoError(t, err)
+	cache, err := saver.s3.fetch(t.Context(), id)
+	require.NoError(t, err)
+	assert.WithinRange(t, time.Unix(cache.CreatedAt, int64(cache.CreatedAtNanos)), started, time.Now())
+	require.NoError(t, restorer.importMetadata(t.Context()))
+	found := v2Call(t, restorer, testClient, "GetCacheEntryDownloadURL", entry)
+	require.Equal(t, true, found["ok"])
+	assert.Equal(t, []byte("archive"), getURL(t, found["signed_download_url"].(string)))
+
+	for _, cache := range []*Cache{
+		{ID: 2, Repo: testRepo, Key: "deps-old", Version: "v1", Complete: true, CreatedAt: cache.CreatedAt},
+		{ID: 1, Repo: testRepo, Key: "deps-new", Version: "v1", Complete: true, CreatedAt: cache.CreatedAt, CreatedAtNanos: 1},
+	} {
+		require.NoError(t, saver.s3.publish(cache))
+		objects.Store(saver.s3.blobKey(cache.ID), []byte(cache.Key))
+	}
+	require.NoError(t, restorer.importMetadata(t.Context()))
+	found = v2Call(t, restorer, testClient, "GetCacheEntryDownloadURL", map[string]any{"key": "deps-", "version": "v1"})
+	require.Equal(t, true, found["ok"])
+	assert.Equal(t, "deps-new", found["matched_key"])
+	assert.Equal(t, []byte("deps-new"), getURL(t, found["signed_download_url"].(string)))
+
+	objects.Clear()
+	require.NoError(t, restorer.importMetadata(t.Context()))
+	assert.Equal(t, true, v2Call(t, restorer, testClient, "CreateCacheEntry", entry)["ok"])
+}
+
+type s3TestTransport func(*http.Request) (*http.Response, error)
+
+func (transport s3TestTransport) RoundTrip(req *http.Request) (*http.Response, error) {
+	return transport(req)
+}
+
+func TestS3StorageUploadsLargeObjectsInPartsAndAbortsOnFailure(t *testing.T) {
+	t.Parallel()
+	for _, failingPart := range []string{"", "2"} {
+		var parts, aborts atomic.Int32
+		var completion struct {
+			Parts []s3Part `xml:"Part"`
+		}
+		storage := &s3Storage{bucketURL: httptest.NewRequest(http.MethodGet, "http://cache.local/bucket", nil).URL}
+		storage.client = &http.Client{Transport: s3TestTransport(func(req *http.Request) (*http.Response, error) {
+			query, response := req.URL.Query(), &http.Response{StatusCode: http.StatusOK, Header: make(http.Header), Body: http.NoBody}
+			switch {
+			case query.Has("uploads"):
+				response.Body = io.NopCloser(strings.NewReader("<InitiateMultipartUploadResult><UploadId>upload</UploadId></InitiateMultipartUploadResult>"))
+			case req.Method == http.MethodPut:
+				parts.Add(1)
+				response.Header.Set("ETag", "etag-"+query.Get("partNumber"))
+				if query.Get("partNumber") == failingPart {
+					response.StatusCode, response.Body = http.StatusBadRequest, io.NopCloser(strings.NewReader("<Error><Code>InvalidPart</Code></Error>"))
+				}
+			case req.Method == http.MethodPost:
+				require.NoError(t, xml.NewDecoder(req.Body).Decode(&completion))
+				response.Body = io.NopCloser(strings.NewReader("<CompleteMultipartUploadResult/>"))
+			case req.Method == http.MethodDelete:
+				aborts.Add(1)
+			}
+			return response, nil
+		})}
+		err := storage.upload(t.Context(), "blobs/1", strings.NewReader(""), 2*int64(s3PartSize)+1)
+		assert.EqualValues(t, 3, parts.Load())
+		if failingPart == "" {
+			require.NoError(t, err)
+			assert.Equal(t, []s3Part{{1, "etag-1"}, {2, "etag-2"}, {3, "etag-3"}}, completion.Parts)
+			assert.Zero(t, aborts.Load())
+		} else {
+			require.ErrorContains(t, err, "InvalidPart")
+			assert.EqualValues(t, 1, aborts.Load())
+		}
+	}
+}
+
+func TestS3StorageSignsLikeAWS(t *testing.T) {
+	t.Parallel()
+	storage := &s3Storage{opts: S3Options{Region: "us-east-1", AccessKey: "AKIAIOSFODNN7EXAMPLE", SecretKey: "wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY"}}
+	req := httptest.NewRequest(http.MethodGet, "https://examplebucket.s3.amazonaws.com/?max-keys=2&prefix=J", nil)
+	req.Header.Set("X-Amz-Content-Sha256", "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855")
+	storage.sign(req, time.Date(2013, 5, 24, 0, 0, 0, 0, time.UTC))
+	assert.Equal(t, "AWS4-HMAC-SHA256 Credential=AKIAIOSFODNN7EXAMPLE/20130524/us-east-1/s3/aws4_request,SignedHeaders=host;x-amz-content-sha256;x-amz-date,Signature=34b48302e7b5fa45bde8084f4b7868a86f0a534bc59db6670ed5711ef69dc6f7", req.Header.Get("Authorization"))
+}

act/artifactcache/storage.go

@@ -5,8 +5,10 @@
 package artifactcache
 
 import (
+	"bytes"
 	"crypto/sha256"
 	"encoding/hex"
+	"encoding/json/v2"
 	"fmt"
 	"io"
 	"net/http"
@@ -30,13 +32,11 @@ func NewStorage(rootDir string) (*Storage, error) {
 }
 
 func (s *Storage) Exist(id uint64) (bool, error) {
-	name := s.filename(id)
-	if _, err := os.Stat(name); os.IsNotExist(err) {
+	_, err := os.Stat(s.filename(id))
+	if os.IsNotExist(err) {
 		return false, nil
-	} else if err != nil {
-		return false, err
 	}
-	return true, nil
+	return err == nil, err
 }
 
 func (s *Storage) Write(id uint64, offset int64, reader io.Reader) error {
@@ -66,6 +66,18 @@ func (s *Storage) WriteBlock(id uint64, blockID string, reader io.Reader) error
 // rename pass is safe because a staged name always carries blockFilePrefix and a target name
 // never does, so no rename can collide with a block not yet moved.
 func (s *Storage) OrderBlocks(id uint64, blockIDs []string) error {
+	wanted, err := json.Marshal(blockIDs) // a block id is client-chosen, so it cannot be a separator
+	if err != nil {
+		return err
+	}
+	list := filepath.Join(s.tempDir(id), blockFilePrefix+"list")
+	if recorded, err := os.ReadFile(list); err == nil {
+		// A retry repeats the list it already sent; another one would reorder what is now staged.
+		if !bytes.Equal(recorded, wanted) {
+			return fmt.Errorf("cache %d was already assembled from a different block list", id)
+		}
+		return nil
+	}
 	for i, blockID := range blockIDs {
 		if err := os.Rename(s.blockName(id, blockID), s.tempName(id, int64(i))); err != nil {
 			if os.IsNotExist(err) {
@@ -74,13 +86,11 @@ func (s *Storage) OrderBlocks(id uint64, blockIDs []string) error {
 			return err
 		}
 	}
-	return nil
+	return os.WriteFile(list, wanted, 0o600)
 }
 
 func (s *Storage) Commit(id uint64, size int64) (int64, error) {
-	defer func() {
-		_ = os.RemoveAll(s.tempDir(id))
-	}()
+	defer func() { _ = os.RemoveAll(s.tempDir(id)) }()
 
 	name := s.filename(id)
 	tempNames, err := s.tempNames(id)
@@ -139,8 +149,7 @@ func assemble(name string, tempNames []string) (int64, error) {
 }
 
 func (s *Storage) Serve(w http.ResponseWriter, r *http.Request, id uint64) {
-	name := s.filename(id)
-	http.ServeFile(w, r, name)
+	http.ServeFile(w, r, s.filename(id))
 }
 
 // Remove deletes an entry's blob and any staged parts. It reports failure so the caller can

act/artifacts/server.go

@@ -11,15 +11,15 @@ import (
 	"fmt"
 	"io"
 	"io/fs"
+	"net"
 	"net/http"
+	"net/url"
 	"os"
 	"path/filepath"
 	"strings"
 	"time"
 
 	"gitea.com/gitea/runner/act/common"
-
-	"github.com/julienschmidt/httprouter"
 )
 
 type FileContainerResourceURL struct {
@@ -66,39 +66,44 @@ func writeJSON(w http.ResponseWriter, value any) {
 	}
 }
 
-func uploads(router *httprouter.Router, baseDir string) {
-	router.POST("/_apis/pipelines/workflows/:runId/artifacts", func(w http.ResponseWriter, req *http.Request, params httprouter.Params) {
-		runID := params.ByName("runId")
-
+func uploads(router *http.ServeMux, baseDir string) {
+	router.HandleFunc("POST /_apis/pipelines/workflows/{runId}/artifacts", func(w http.ResponseWriter, req *http.Request) {
 		writeJSON(w, FileContainerResourceURL{
-			FileContainerResourceURL: fmt.Sprintf("http://%s/upload/%s", req.Host, runID),
+			FileContainerResourceURL: fmt.Sprintf("http://%s/upload/%s", req.Host, req.PathValue("runId")),
 		})
 	})
 
-	router.PUT("/upload/:runId", func(w http.ResponseWriter, req *http.Request, params httprouter.Params) {
+	router.HandleFunc("PUT /upload/{runId}", func(w http.ResponseWriter, req *http.Request) {
 		itemPath := req.URL.Query().Get("itemPath")
-		runID := params.ByName("runId")
 
 		if req.Header.Get("Content-Encoding") == "gzip" {
 			itemPath += gzipExtension
 		}
 
-		safeRunPath := safeResolve(baseDir, runID)
-		safePath := safeResolve(safeRunPath, itemPath)
+		safePath := safeResolve(safeResolve(baseDir, req.PathValue("runId")), itemPath)
 
 		if err := os.MkdirAll(filepath.Dir(safePath), os.ModePerm); err != nil {
 			panic(err)
 		}
-		flags := os.O_CREATE | os.O_WRONLY | os.O_TRUNC
-		appendUpload := req.Header.Get("Content-Range")
-		if appendUpload != "" && !strings.HasPrefix(appendUpload, "bytes 0-") {
-			flags = os.O_CREATE | os.O_WRONLY | os.O_APPEND
+		var start int64
+		if contentRange := req.Header.Get("Content-Range"); contentRange != "" {
+			if _, err := fmt.Sscanf(contentRange, "bytes %d-", &start); err != nil || start < 0 {
+				http.Error(w, "invalid content range", http.StatusBadRequest)
+				return
+			}
+		}
+		flags := os.O_CREATE | os.O_WRONLY
+		if start == 0 {
+			flags |= os.O_TRUNC
 		}
 		file, err := os.OpenFile(safePath, flags, 0o644)
 		if err != nil {
 			panic(err)
 		}
 		defer file.Close()
+		if _, err := file.Seek(start, io.SeekStart); err != nil {
+			panic(err)
+		}
 		if req.Body == nil {
 			panic(errors.New("no body given"))
 		}
@@ -113,21 +118,19 @@ func uploads(router *httprouter.Router, baseDir string) {
 		})
 	})
 
-	router.PATCH("/_apis/pipelines/workflows/:runId/artifacts", func(w http.ResponseWriter, req *http.Request, params httprouter.Params) {
+	router.HandleFunc("PATCH /_apis/pipelines/workflows/{runId}/artifacts", func(w http.ResponseWriter, _req *http.Request) {
 		writeJSON(w, ResponseMessage{
 			Message: "success",
 		})
 	})
 }
 
-func downloads(router *httprouter.Router, baseDir string) {
-	router.GET("/_apis/pipelines/workflows/:runId/artifacts", func(w http.ResponseWriter, req *http.Request, params httprouter.Params) {
-		runID := params.ByName("runId")
+func downloads(router *http.ServeMux, baseDir string) {
+	router.HandleFunc("GET /_apis/pipelines/workflows/{runId}/artifacts", func(w http.ResponseWriter, req *http.Request) {
+		runID := req.PathValue("runId")
 
-		safePath := safeResolve(baseDir, runID)
-
-		entries, err := os.ReadDir(safePath)
-		if err != nil {
+		entries, err := os.ReadDir(safeResolve(baseDir, runID))
+		if err != nil && !os.IsNotExist(err) {
 			panic(err)
 		}
 
@@ -145,13 +148,16 @@ func downloads(router *httprouter.Router, baseDir string) {
 		})
 	})
 
-	router.GET("/download/:container", func(w http.ResponseWriter, req *http.Request, params httprouter.Params) {
-		container := params.ByName("container")
+	router.HandleFunc("GET /download/{container}", func(w http.ResponseWriter, req *http.Request) {
+		container := req.PathValue("container")
 		itemPath := req.URL.Query().Get("itemPath")
 		safePath := safeResolve(baseDir, filepath.Join(container, itemPath))
 
 		var files []ContainerItem
 		err := filepath.WalkDir(safePath, func(path string, entry fs.DirEntry, err error) error {
+			if err != nil {
+				return err
+			}
 			if !entry.IsDir() {
 				rel, err := filepath.Rel(safePath, path)
 				if err != nil {
@@ -160,20 +166,16 @@ func downloads(router *httprouter.Router, baseDir string) {
 
 				// if it was upload as gzip
 				rel = strings.TrimSuffix(rel, gzipExtension)
-				path := filepath.Join(itemPath, rel)
-
-				rel = filepath.ToSlash(rel)
-				path = filepath.ToSlash(path)
 
 				files = append(files, ContainerItem{
-					Path:            path,
+					Path:            filepath.ToSlash(filepath.Join(itemPath, rel)),
 					ItemType:        "file",
-					ContentLocation: fmt.Sprintf("http://%s/artifact/%s/%s/%s", req.Host, container, itemPath, rel),
+					ContentLocation: (&url.URL{Scheme: "http", Host: req.Host, Path: "/artifact/" + container + "/" + itemPath + "/" + filepath.ToSlash(rel)}).String(),
 				})
 			}
 			return nil
 		})
-		if err != nil {
+		if err != nil && !os.IsNotExist(err) {
 			panic(err)
 		}
 
@@ -182,10 +184,8 @@ func downloads(router *httprouter.Router, baseDir string) {
 		})
 	})
 
-	router.GET("/artifact/*path", func(w http.ResponseWriter, req *http.Request, params httprouter.Params) {
-		path := params.ByName("path")[1:]
-
-		safePath := safeResolve(baseDir, path)
+	router.HandleFunc("GET /artifact/{path...}", func(w http.ResponseWriter, req *http.Request) {
+		safePath := safeResolve(baseDir, req.PathValue("path"))
 
 		file, err := os.Open(safePath)
 		if err != nil {
@@ -213,23 +213,25 @@ func Serve(ctx context.Context, artifactPath, addr, port string) context.CancelF
 		return cancel
 	}
 
-	router := httprouter.New()
+	router := http.NewServeMux()
 
 	logger.Debugf("Artifacts base path '%s'", artifactPath)
 	uploads(router, artifactPath)
 	downloads(router, artifactPath)
+	registerV4(router, artifactPath)
 
 	server := &http.Server{
-		Addr:              fmt.Sprintf("%s:%s", addr, port),
+		Addr:              net.JoinHostPort(addr, port),
 		ReadHeaderTimeout: 2 * time.Second,
 		Handler:           router,
 	}
 
 	// run server
 	go func() {
-		logger.Infof("Start server on http://%s:%s", addr, port)
+		logger.Infof("Start server on http://%s", server.Addr)
 		if err := server.ListenAndServe(); err != nil && err != http.ErrServerClosed {
-			logger.Fatal(err)
+			logger.Error(err)
+			os.Exit(1)
 		}
 	}()
 

act/artifacts/server_test.go

@@ -19,16 +19,16 @@ import (
 	"testing"
 	"time"
 
-	"github.com/julienschmidt/httprouter"
 	"github.com/stretchr/testify/require"
 )
 
 func TestArtifactFlow(t *testing.T) {
 	artifactPath := t.TempDir()
 
-	router := httprouter.New()
+	router := http.NewServeMux()
 	uploads(router, artifactPath)
 	downloads(router, artifactPath)
+	registerV4(router, artifactPath)
 	server := httptest.NewServer(router)
 	defer server.Close()
 
@@ -49,8 +49,17 @@ func TestArtifactFlow(t *testing.T) {
 		return resp.StatusCode, data
 	}
 
+	t.Run("no-artifacts", func(t *testing.T) {
+		status, data := request(t, http.MethodGet, baseURL+"/_apis/pipelines/workflows/0/artifacts", nil, nil)
+		require.Equal(t, http.StatusOK, status, string(data))
+		var list NamedFileContainerResourceURLResponse
+		require.NoError(t, json.Unmarshal(data, &list))
+		require.Zero(t, list.Count)
+		require.Empty(t, list.Value)
+	})
+
 	t.Run("upload-and-download", func(t *testing.T) {
-		const runID, item, content = "1", "my-artifact/data.txt", "hello artifact\n"
+		const runID, item, content = "1", "my-artifact/data#1%25.txt", "hello artifact\n"
 
 		status, data := request(t, http.MethodPost, baseURL+"/_apis/pipelines/workflows/"+runID+"/artifacts", nil, nil)
 		require.Equal(t, http.StatusOK, status, string(data))
@@ -82,13 +91,13 @@ func TestArtifactFlow(t *testing.T) {
 		require.NoError(t, json.Unmarshal(data, &items))
 		require.Len(t, items.Value, 1)
 		require.Equal(t, "file", items.Value[0].ItemType)
-		require.Equal(t, "my-artifact/data.txt", items.Value[0].Path)
+		require.Equal(t, item, items.Value[0].Path)
 
 		status, data = request(t, http.MethodGet, items.Value[0].ContentLocation, nil, nil)
 		require.Equal(t, http.StatusOK, status)
 		require.Equal(t, content, string(data))
 
-		stored, err := os.ReadFile(filepath.Join(artifactPath, runID, "my-artifact", "data.txt"))
+		stored, err := os.ReadFile(filepath.Join(artifactPath, runID, filepath.FromSlash(item)))
 		require.NoError(t, err)
 		require.Equal(t, content, string(stored))
 	})
@@ -96,16 +105,25 @@ func TestArtifactFlow(t *testing.T) {
 	t.Run("content-range", func(t *testing.T) {
 		const rawURL = "/upload/4?itemPath=chunks.txt"
 		status, data := request(t, http.MethodPut, baseURL+rawURL, strings.NewReader("first"),
-			http.Header{"Content-Range": []string{"bytes 0-4/11"}})
+			http.Header{"Content-Range": []string{"bytes 0-4/12"}})
 		require.Equal(t, http.StatusOK, status, string(data))
 
-		status, data = request(t, http.MethodPut, baseURL+rawURL, strings.NewReader("-second"),
-			http.Header{"Content-Range": []string{"bytes 5-11/11"}})
-		require.Equal(t, http.StatusOK, status, string(data))
+		for range 2 {
+			status, data = request(t, http.MethodPut, baseURL+rawURL, strings.NewReader("-second"),
+				http.Header{"Content-Range": []string{"bytes 5-11/12"}})
+			require.Equal(t, http.StatusOK, status, string(data))
+		}
 
 		stored, err := os.ReadFile(filepath.Join(artifactPath, "4", "chunks.txt"))
 		require.NoError(t, err)
 		require.Equal(t, "first-second", string(stored))
+
+		status, data = request(t, http.MethodPut, baseURL+rawURL, strings.NewReader(""),
+			http.Header{"Content-Range": []string{"bytes 0--1/0"}})
+		require.Equal(t, http.StatusOK, status, string(data))
+		stored, err = os.ReadFile(filepath.Join(artifactPath, "4", "chunks.txt"))
+		require.NoError(t, err)
+		require.Empty(t, stored)
 	})
 
 	t.Run("gzip-roundtrip", func(t *testing.T) {
@@ -157,6 +175,92 @@ func TestArtifactFlow(t *testing.T) {
 		require.Equal(t, http.StatusOK, status)
 		require.Equal(t, content, string(data))
 	})
+
+	t.Run("v4", func(t *testing.T) {
+		const artifactRef = `"workflow_run_backend_id":"7","name":"50% art@v1"`
+		call := func(method, body string) (int, map[string]any) {
+			status, data := request(t, http.MethodPost, baseURL+artifactServicePath+"/"+method, strings.NewReader(body), nil)
+			var out map[string]any
+			require.NoError(t, json.Unmarshal(data, &out), string(data))
+			return status, out
+		}
+		put := func(rawURL, body string) int {
+			status, _ := request(t, http.MethodPut, rawURL, strings.NewReader(body), nil)
+			return status
+		}
+		download := func() (string, http.Header) {
+			status, signed := call("GetSignedArtifactURL", "{"+artifactRef+"}")
+			require.Equal(t, http.StatusOK, status, signed)
+			resp, err := client.Get(signed["signedUrl"].(string))
+			require.NoError(t, err)
+			defer resp.Body.Close()
+			require.Equal(t, http.StatusOK, resp.StatusCode)
+			body, err := io.ReadAll(resp.Body)
+			require.NoError(t, err)
+			return string(body), resp.Header
+		}
+
+		status, created := call("CreateArtifact", "{"+artifactRef+"}")
+		require.Equal(t, http.StatusOK, status, created)
+		upload := created["signedUploadUrl"].(string)
+		require.Equal(t, http.StatusCreated, put(upload+"&comp=block&blockid=Yg", "world"))
+		require.Equal(t, http.StatusCreated, put(upload+"&comp=block&blockid=YQ", "hello "))
+		for attempt := range 2 {
+			require.Equal(t, http.StatusCreated, put(upload+"&comp=blocklist", `<?xml version="1.0"?><BlockList><Latest>YQ</Latest><Latest>Yg</Latest></BlockList>`), "commit attempt %d", attempt)
+		}
+
+		digest := "sha256:b94d27b9934d3e08a52e52d7da7dabfac484efe37a5380ee9088f7ace2efcde9"
+		status, _ = call("FinalizeArtifact", "{"+artifactRef+`,"size":"10"}`)
+		require.Equal(t, http.StatusBadRequest, status)
+		status, finalized := call("FinalizeArtifact", "{"+artifactRef+`,"size":"11","hash":"`+digest+`"}`)
+		require.Equal(t, http.StatusOK, status, finalized)
+		id := finalized["artifactId"].(string)
+		status, refinalized := call("FinalizeArtifact", "{"+artifactRef+`,"size":"10"}`)
+		require.Equal(t, http.StatusOK, status)
+		require.Equal(t, id, refinalized["artifactId"])
+		status, conflict := call("CreateArtifact", "{"+artifactRef+"}")
+		require.Equal(t, http.StatusConflict, status)
+		require.Equal(t, "already_exists", conflict["code"])
+
+		status, listed := call("ListArtifacts", `{"workflowRunBackendId":"7","idFilter":"`+id+`"}`)
+		require.Equal(t, http.StatusOK, status)
+		artifacts := listed["artifacts"].([]any)
+		require.Len(t, artifacts, 1)
+		artifact := artifacts[0].(map[string]any)
+		require.Regexp(t, `^\d{4}-\d\d-\d\dT\d\d:\d\d:\d\dZ$`, artifact["createdAt"])
+		delete(artifact, "createdAt")
+		require.Equal(t, map[string]any{"workflowRunBackendId": "7", "name": "50% art@v1", "size": "11", "digest": digest, "databaseId": id}, artifact)
+		_, other := call("ListArtifacts", `{"workflow_run_backend_id":"8"}`)
+		require.Empty(t, other["artifacts"])
+
+		body, header := download()
+		require.Equal(t, "hello world", body)
+		require.Equal(t, "application/zip", header.Get("Content-Type"))
+		require.Equal(t, "attachment; filename*=UTF-8''50%25%20art%40v1.zip", header.Get("Content-Disposition"))
+
+		status, _ = call("DeleteArtifact", "{"+artifactRef+"}")
+		require.Equal(t, http.StatusOK, status)
+		status, missing := call("GetSignedArtifactURL", "{"+artifactRef+"}")
+		require.Equal(t, http.StatusNotFound, status)
+		require.Equal(t, "not_found", missing["code"])
+
+		status, created = call("CreateArtifact", "{"+artifactRef+"}")
+		require.Equal(t, http.StatusOK, status, created)
+		status, _ = request(t, http.MethodPut, created["signedUploadUrl"].(string), strings.NewReader("gz"), http.Header{"X-Ms-Blob-Content-Type": {"application/gzip"}})
+		require.Equal(t, http.StatusCreated, status)
+		status, _ = call("FinalizeArtifact", "{"+artifactRef+`,"size":"2"}`)
+		require.Equal(t, http.StatusOK, status)
+		body, header = download()
+		require.Equal(t, "gz", body)
+		require.Equal(t, "application/gzip", header.Get("Content-Type"))
+		require.Equal(t, "attachment; filename*=UTF-8''50%25%20art%40v1", header.Get("Content-Disposition"))
+
+		rerun := http.NewServeMux()
+		registerV4(rerun, artifactPath)
+		recorder := httptest.NewRecorder()
+		rerun.ServeHTTP(recorder, httptest.NewRequest(http.MethodPost, artifactServicePath+"/CreateArtifact", strings.NewReader("{"+artifactRef+"}")))
+		require.Equal(t, http.StatusOK, recorder.Code, recorder.Body.String())
+	})
 }
 
 func TestSafeResolve(t *testing.T) {
@@ -177,7 +281,7 @@ func TestSafeResolve(t *testing.T) {
 
 	for name, tc := range tests {
 		t.Run(name, func(t *testing.T) {
-			require.Equal(t, tc.want, safeResolve(baseDir, tc.input))
+			require.Equal(t, filepath.FromSlash(tc.want), safeResolve(baseDir, tc.input))
 		})
 	}
 }

act/artifacts/server_v4.go

@@ -0,0 +1,329 @@
+// Copyright 2026 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package artifacts
+
+import (
+	"cmp"
+	"crypto/sha256"
+	"encoding/hex"
+	"encoding/json/v2"
+	"encoding/xml"
+	"errors"
+	"fmt"
+	"io"
+	"io/fs"
+	"net/http"
+	"net/url"
+	"os"
+	"path/filepath"
+	"slices"
+	"strings"
+	"sync"
+	"time"
+)
+
+type serverV4 struct { // the subset of Gitea's v4 artifact service that the toolkit uses, unauthenticated like the v3 routes beside it
+	dir     string
+	mu      sync.Mutex
+	lastID  int64
+	created map[string]bool
+}
+
+const (
+	zipMimeType   = "application/zip"
+	maxTwirpBytes = 1 << 20
+)
+
+func registerV4(router *http.ServeMux, baseDir string) {
+	server := &serverV4{dir: filepath.Join(baseDir, "v4"), lastID: time.Now().UnixMilli(), created: map[string]bool{}} // IDs stay unique across invocations sharing baseDir
+	router.HandleFunc("POST "+artifactServicePath+"/CreateArtifact", twirp(server.createArtifact))
+	router.HandleFunc("POST "+artifactServicePath+"/FinalizeArtifact", twirp(server.finalizeArtifact))
+	router.HandleFunc("POST "+artifactServicePath+"/ListArtifacts", twirp(server.listArtifacts))
+	router.HandleFunc("POST "+artifactServicePath+"/GetSignedArtifactURL", twirp(server.getSignedArtifactURL))
+	router.HandleFunc("POST "+artifactServicePath+"/DeleteArtifact", twirp(server.deleteArtifact))
+	router.HandleFunc("PUT "+artifactServicePath+"/UploadArtifact", server.uploadArtifact)
+	router.HandleFunc("GET "+artifactServicePath+"/DownloadArtifact", server.downloadArtifact)
+}
+
+type twirpError struct {
+	status int
+	code   string
+	msg    string
+}
+
+func (e *twirpError) Error() string { return e.msg }
+
+func notFound(name string) error {
+	return &twirpError{http.StatusNotFound, "not_found", fmt.Sprintf("artifact %q not found", name)}
+}
+
+func badRequest(format string, args ...any) error {
+	return &twirpError{http.StatusBadRequest, "invalid_argument", fmt.Sprintf(format, args...)}
+}
+
+func twirp[Req, Resp any](handle func(*http.Request, Req) (Resp, error)) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		var req Req
+		var resp Resp
+		err := json.UnmarshalRead(io.LimitReader(r.Body, maxTwirpBytes), &req, json.MatchCaseInsensitiveNames(true)) // also matches the toolkit's proto field names
+		if err != nil {
+			err = badRequest("malformed request: %v", err)
+		} else {
+			resp, err = handle(r, req)
+		}
+		w.Header().Set("Content-Type", "application/json")
+		if err != nil {
+			terr := &twirpError{http.StatusInternalServerError, "internal", err.Error()}
+			errors.As(err, &terr)
+			w.WriteHeader(terr.status)
+			_ = json.MarshalWrite(w, map[string]string{"code": terr.code, "msg": terr.msg})
+			return
+		}
+		_ = json.MarshalWrite(w, resp)
+	}
+}
+
+func fileName(name string) string { // safe on any filesystem for any client-chosen name, case-insensitive ones included
+	sum := sha256.Sum256([]byte(name))
+	return hex.EncodeToString(sum[:])
+}
+
+func (s *serverV4) runDir(runID string) string {
+	return filepath.Join(s.dir, fileName(runID))
+}
+
+func (s *serverV4) artifactDir(runID, name string) string {
+	return filepath.Join(s.runDir(runID), fileName(name))
+}
+
+func (s *serverV4) urlDir(r *http.Request) string {
+	return s.artifactDir(r.URL.Query().Get("run"), r.URL.Query().Get("name"))
+}
+
+func readMeta(dir string) (*monolithArtifact, error) {
+	data, err := os.ReadFile(filepath.Join(dir, "meta.json"))
+	if err != nil {
+		return nil, err
+	}
+	var meta monolithArtifact
+	return &meta, json.Unmarshal(data, &meta)
+}
+
+func writeMeta(dir string, meta *monolithArtifact) error {
+	data, err := json.Marshal(meta)
+	if err != nil {
+		return err
+	}
+	return os.WriteFile(filepath.Join(dir, "meta.json"), data, 0o644)
+}
+
+func blobURL(r *http.Request, endpoint, runID, name string) string {
+	return "http://" + r.Host + artifactServicePath + "/" + endpoint + "?" + url.Values{"run": {runID}, "name": {name}}.Encode()
+}
+
+func (s *serverV4) createArtifact(r *http.Request, req createArtifactRequest) (createArtifactResponse, error) { // an exec invocation re-runs its workflows, so it replaces earlier invocations' artifacts but conflicts with its own
+	dir := s.artifactDir(req.WorkflowRunBackendID, req.Name)
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	if s.created[dir] {
+		return createArtifactResponse{}, &twirpError{http.StatusConflict, "already_exists", "an artifact with this name already exists on the workflow run"}
+	}
+	if err := os.RemoveAll(dir); err != nil {
+		return createArtifactResponse{}, err
+	}
+	if err := os.MkdirAll(filepath.Join(dir, "blocks"), 0o755); err != nil {
+		return createArtifactResponse{}, err
+	}
+	s.lastID++
+	if err := writeMeta(dir, &monolithArtifact{
+		WorkflowRunBackendID: req.WorkflowRunBackendID,
+		DatabaseID:           s.lastID,
+		Name:                 req.Name,
+		CreatedAt:            time.Now().UTC().Truncate(time.Second),
+	}); err != nil {
+		return createArtifactResponse{}, err
+	}
+	s.created[dir] = true
+	return createArtifactResponse{Ok: true, SignedUploadURL: blobURL(r, "UploadArtifact", req.WorkflowRunBackendID, req.Name)}, nil
+}
+
+type blockList struct {
+	Blocks []string `xml:",any"` // Latest, Committed and Uncommitted all name a staged block
+}
+
+func (s *serverV4) uploadArtifact(w http.ResponseWriter, r *http.Request) {
+	dir := s.urlDir(r)
+	if meta, err := readMeta(dir); err != nil || meta.Digest != "" {
+		http.Error(w, "no artifact awaits an upload", http.StatusNotFound)
+		return
+	}
+	contentType := r.Header.Get("x-ms-blob-content-type")
+	var err error
+	switch comp := r.URL.Query().Get("comp"); comp {
+	case "block":
+		err = writeFile(filepath.Join(dir, "blocks", fileName(r.URL.Query().Get("blockid"))), r.Body)
+	case "blocklist":
+		err = commitBlob(dir, contentType, func(out io.Writer) error { return joinBlocks(out, dir, r.Body) })
+	case "": // Put Blob, which docker/build-push-action uses
+		err = commitBlob(dir, contentType, func(out io.Writer) error {
+			_, err := io.Copy(out, r.Body)
+			return err
+		})
+	default:
+		http.Error(w, "unsupported comp "+comp, http.StatusBadRequest)
+		return
+	}
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+	w.WriteHeader(http.StatusCreated)
+}
+
+func writeFile(name string, body io.Reader) error {
+	file, err := os.Create(name)
+	if err != nil {
+		return err
+	}
+	_, err = io.Copy(file, body)
+	return errors.Join(err, file.Close())
+}
+
+func commitBlob(dir, contentType string, write func(io.Writer) error) error { // replaces the blob whole and keeps its content type, as Azure does
+	out, err := os.CreateTemp(dir, "blob")
+	if err != nil {
+		return err
+	}
+	if err = errors.Join(write(out), out.Close()); err == nil {
+		err = os.Rename(out.Name(), filepath.Join(dir, "blob"))
+	}
+	if err != nil {
+		return errors.Join(err, os.Remove(out.Name()))
+	}
+	return os.WriteFile(filepath.Join(dir, "content-type"), []byte(contentType), 0o644)
+}
+
+func joinBlocks(out io.Writer, dir string, body io.Reader) error { // keeps the blocks for finalizeArtifact, so that a retried commit can join them again
+	var list blockList
+	if err := xml.NewDecoder(io.LimitReader(body, maxTwirpBytes)).Decode(&list); err != nil {
+		return err
+	}
+	for _, id := range list.Blocks {
+		if err := appendBlock(out, filepath.Join(dir, "blocks", fileName(id))); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func appendBlock(out io.Writer, name string) error {
+	in, err := os.Open(name)
+	if err != nil {
+		return err
+	}
+	defer in.Close()
+	_, err = io.Copy(out, in)
+	return err
+}
+
+func (s *serverV4) finalizeArtifact(_ *http.Request, req finalizeArtifactRequest) (finalizeArtifactResponse, error) {
+	dir := s.artifactDir(req.WorkflowRunBackendID, req.Name)
+	meta, err := readMeta(dir)
+	if err != nil {
+		return finalizeArtifactResponse{}, notFound(req.Name)
+	} else if meta.Digest != "" {
+		return finalizeArtifactResponse{Ok: true, ArtifactID: meta.DatabaseID}, nil
+	}
+	blob, err := os.Open(filepath.Join(dir, "blob"))
+	if err != nil {
+		return finalizeArtifactResponse{}, badRequest("artifact %q has no upload", req.Name)
+	}
+	defer blob.Close()
+	hash := sha256.New()
+	size, err := io.Copy(hash, blob)
+	if err != nil {
+		return finalizeArtifactResponse{}, err
+	}
+	digest := "sha256:" + hex.EncodeToString(hash.Sum(nil))
+	if size != req.Size {
+		return finalizeArtifactResponse{}, badRequest("size %d does not match the %d bytes uploaded", req.Size, size)
+	}
+	if req.Hash != "" && req.Hash != digest {
+		return finalizeArtifactResponse{}, badRequest("hash %s does not match the uploaded %s", req.Hash, digest)
+	}
+	s.mu.Lock() // only after hashing, so finalizing one large artifact does not stall the others
+	defer s.mu.Unlock()
+	if current, err := readMeta(dir); err != nil || current.DatabaseID != meta.DatabaseID {
+		return finalizeArtifactResponse{}, notFound(req.Name)
+	}
+	meta.Size, meta.Digest = size, digest
+	if err := writeMeta(dir, meta); err != nil {
+		return finalizeArtifactResponse{}, err
+	}
+	return finalizeArtifactResponse{Ok: true, ArtifactID: meta.DatabaseID}, os.RemoveAll(filepath.Join(dir, "blocks"))
+}
+
+func (s *serverV4) listArtifacts(_ *http.Request, req listArtifactsRequest) (listArtifactsResponse, error) {
+	run := s.runDir(req.WorkflowRunBackendID)
+	entries, err := os.ReadDir(run)
+	if err != nil && !errors.Is(err, fs.ErrNotExist) {
+		return listArtifactsResponse{}, err
+	}
+	var resp listArtifactsResponse
+	for _, entry := range entries {
+		meta, err := readMeta(filepath.Join(run, entry.Name()))
+		if err != nil || meta.Digest == "" ||
+			req.NameFilter != "" && req.NameFilter != meta.Name || req.IDFilter != 0 && req.IDFilter != meta.DatabaseID {
+			continue
+		}
+		resp.Artifacts = append(resp.Artifacts, *meta)
+	}
+	slices.SortFunc(resp.Artifacts, func(left, right monolithArtifact) int { return cmp.Compare(left.DatabaseID, right.DatabaseID) })
+	return resp, nil
+}
+
+func (s *serverV4) getSignedArtifactURL(r *http.Request, req getSignedArtifactURLRequest) (getSignedArtifactURLResponse, error) {
+	if meta, err := readMeta(s.artifactDir(req.WorkflowRunBackendID, req.Name)); err != nil || meta.Digest == "" {
+		return getSignedArtifactURLResponse{}, notFound(req.Name)
+	}
+	return getSignedArtifactURLResponse{SignedURL: blobURL(r, "DownloadArtifact", req.WorkflowRunBackendID, req.Name)}, nil
+}
+
+func (s *serverV4) downloadArtifact(w http.ResponseWriter, r *http.Request) {
+	dir := s.urlDir(r)
+	meta, err := readMeta(dir)
+	if err != nil || meta.Digest == "" {
+		http.Error(w, "artifact not found", http.StatusNotFound)
+		return
+	}
+	blob, err := os.Open(filepath.Join(dir, "blob"))
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+	defer blob.Close()
+	data, _ := os.ReadFile(filepath.Join(dir, "content-type"))
+	contentType, filename := string(data), meta.Name
+	if !strings.Contains(contentType, "/") {
+		contentType = zipMimeType
+	}
+	if contentType == zipMimeType && !strings.HasSuffix(filename, ".zip") {
+		filename += ".zip"
+	}
+	w.Header().Set("Content-Type", contentType)
+	w.Header().Set("Content-Disposition", "attachment; filename*=UTF-8''"+strings.ReplaceAll(url.QueryEscape(filename), "+", "%20")) // RFC 5987 attr-chars only, which the toolkit and mime.ParseMediaType both accept
+	http.ServeContent(w, r, "", meta.CreatedAt, blob)
+}
+
+func (s *serverV4) deleteArtifact(_ *http.Request, req deleteArtifactRequest) (deleteArtifactResponse, error) {
+	dir := s.artifactDir(req.WorkflowRunBackendID, req.Name)
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	meta, err := readMeta(dir)
+	if err != nil {
+		return deleteArtifactResponse{}, notFound(req.Name)
+	}
+	delete(s.created, dir)
+	return deleteArtifactResponse{Ok: true, ArtifactID: meta.DatabaseID}, os.RemoveAll(dir)
+}

act/artifacts/token.go

@@ -0,0 +1,23 @@
+// Copyright 2026 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package artifacts
+
+import (
+	"crypto/rand"
+	"encoding/base64"
+	"encoding/json/v2"
+	"time"
+)
+
+func LocalRuntimeToken(run string, lifetime time.Duration) string { // an unsecured JWT with the claims the toolkit and buildx read, its run hashed for scp and its jti an unguessable bearer
+	now := time.Now()
+	claims, _ := json.Marshal(map[string]any{
+		"scp": "Actions.Results:" + fileName(run) + ":1",
+		"ac":  `[{"Scope":"","Permission":3}]`,
+		"nbf": now.Unix(),
+		"exp": now.Add(lifetime).Unix(),
+		"jti": rand.Text(),
+	})
+	return base64.RawURLEncoding.EncodeToString([]byte(`{"alg":"none","typ":"JWT"}`)) + "." + base64.RawURLEncoding.EncodeToString(claims) + "."
+}

act/artifacts/twirp.go

@@ -0,0 +1,55 @@
+// Copyright 2026 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package artifacts
+
+import "time"
+
+const artifactServicePath = "/twirp/github.actions.results.api.v1.ArtifactService"
+
+type ( // the ArtifactService messages in the protobuf JSON mapping, which writes int64 as strings
+	createArtifactResponse struct {
+		Ok              bool   `json:"ok"`
+		SignedUploadURL string `json:"signedUploadUrl"`
+	}
+
+	finalizeArtifactRequest struct {
+		WorkflowRunBackendID string
+		Name                 string
+		Size                 int64 `json:",string"`
+		Hash                 string
+	}
+	finalizeArtifactResponse struct {
+		Ok         bool  `json:"ok"`
+		ArtifactID int64 `json:"artifactId,string"`
+	}
+
+	listArtifactsRequest struct {
+		WorkflowRunBackendID string
+		NameFilter           string
+		IDFilter             int64 `json:",string"`
+	}
+	listArtifactsResponse struct {
+		Artifacts []monolithArtifact `json:"artifacts"`
+	}
+	monolithArtifact struct {
+		WorkflowRunBackendID string    `json:"workflowRunBackendId"` // the toolkit sends it back to GetSignedArtifactURL
+		DatabaseID           int64     `json:"databaseId,string"`
+		Name                 string    `json:"name"`
+		Size                 int64     `json:"size,string"`
+		CreatedAt            time.Time `json:"createdAt"` // whole seconds, the toolkit rejects the trimmed fractions json writes
+		Digest               string    `json:"digest"`    // empty until the upload is finalized
+	}
+
+	getSignedArtifactURLRequest struct {
+		WorkflowRunBackendID string
+		Name                 string
+	}
+	getSignedArtifactURLResponse struct {
+		SignedURL string `json:"signedUrl"`
+	}
+
+	createArtifactRequest  = getSignedArtifactURLRequest
+	deleteArtifactRequest  = getSignedArtifactURLRequest
+	deleteArtifactResponse = finalizeArtifactResponse
+)

act/common/context_helpers_test.go

@@ -4,15 +4,15 @@
 package common
 
 import (
-	"context"
 	"errors"
 	"testing"
 
-	"github.com/sirupsen/logrus"
+	"gitea.com/gitea/runner/act/common/logging"
+	"gitea.com/gitea/runner/act/common/logging/logtest"
 )
 
 func TestDryrunContext(t *testing.T) {
-	ctx := context.Background()
+	ctx := t.Context()
 	if Dryrun(ctx) {
 		t.Fatal("plain context should not be dryrun")
 	}
@@ -25,7 +25,7 @@ func TestDryrunContext(t *testing.T) {
 }
 
 func TestJobErrorContainer(t *testing.T) {
-	ctx := context.Background()
+	ctx := t.Context()
 	err := errors.New("job failed")
 
 	SetJobError(ctx, err)
@@ -40,34 +40,27 @@ func TestJobErrorContainer(t *testing.T) {
 	}
 }
 
-func TestLoggerAndHookContext(t *testing.T) {
-	ctx := context.Background()
-	if Logger(ctx) != logrus.StandardLogger() {
-		t.Fatal("plain context should use standard logger")
+func TestLoggerAndHandlerContext(t *testing.T) {
+	ctx := t.Context()
+	if Logger(ctx) != logging.Default() {
+		t.Fatal("plain context should use the default logger")
 	}
-	if LoggerHook(ctx) != nil {
-		t.Fatal("plain context should not have a logger hook")
+	if LoggerHandler(ctx) != nil {
+		t.Fatal("plain context should not have a logger handler")
+	}
+	if StepIDs(ctx) != nil {
+		t.Fatal("plain context should not have step IDs")
 	}
 
-	logger := logrus.New()
+	logger := logging.New(logtest.New())
 	ctx = WithLogger(ctx, logger)
 	if Logger(ctx) != logger {
 		t.Fatal("WithLogger should set logger")
 	}
 
-	hook := testHook{}
-	ctx = WithLoggerHook(ctx, hook)
-	if LoggerHook(ctx) != hook {
-		t.Fatal("WithLoggerHook should set hook")
+	handler := logtest.New()
+	ctx = WithLoggerHandler(ctx, handler)
+	if LoggerHandler(ctx) != handler {
+		t.Fatal("WithLoggerHandler should set handler")
 	}
 }
-
-type testHook struct{}
-
-func (testHook) Levels() []logrus.Level {
-	return logrus.AllLevels
-}
-
-func (testHook) Fire(*logrus.Entry) error {
-	return nil
-}

act/common/dryrun.go

@@ -14,13 +14,8 @@ const dryrunContextKeyVal = dryrunContextKey("dryrun")
 
 // Dryrun returns true if the current context is dryrun
 func Dryrun(ctx context.Context) bool {
-	val := ctx.Value(dryrunContextKeyVal)
-	if val != nil {
-		if dryrun, ok := val.(bool); ok {
-			return dryrun
-		}
-	}
-	return false
+	dryrun, _ := ctx.Value(dryrunContextKeyVal).(bool)
+	return dryrun
 }
 
 // WithDryrun adds a value to the context for dryrun

act/common/executor.go

@@ -9,7 +9,7 @@ import (
 	"fmt"
 	"runtime/debug"
 
-	log "github.com/sirupsen/logrus"
+	"gitea.com/gitea/runner/act/common/logging"
 )
 
 // Executor define contract for the steps of a workflow
@@ -21,8 +21,7 @@ type Conditional func(ctx context.Context) bool
 // NewInfoExecutor is an executor that logs messages
 func NewInfoExecutor(format string, args ...any) Executor {
 	return func(ctx context.Context) error {
-		logger := Logger(ctx)
-		logger.Infof(format, args...)
+		Logger(ctx).Infof(format, args...)
 		return nil
 	}
 }
@@ -30,8 +29,7 @@ func NewInfoExecutor(format string, args ...any) Executor {
 // NewDebugExecutor is an executor that logs messages
 func NewDebugExecutor(format string, args ...any) Executor {
 	return func(ctx context.Context) error {
-		logger := Logger(ctx)
-		logger.Debugf(format, args...)
+		Logger(ctx).Debugf(format, args...)
 		return nil
 	}
 }
@@ -39,9 +37,7 @@ func NewDebugExecutor(format string, args ...any) Executor {
 // NewPipelineExecutor creates a new executor from a series of other executors
 func NewPipelineExecutor(executors ...Executor) Executor {
 	if len(executors) == 0 {
-		return func(ctx context.Context) error {
-			return nil
-		}
+		return NewErrorExecutor(nil)
 	}
 	var rtn Executor
 	for _, executor := range executors {
@@ -61,6 +57,13 @@ func NewErrorExecutor(err error) Executor {
 	}
 }
 
+func RecoverPanic(err *error) { // defer directly in workers to keep stacks in host logs
+	if recovered := recover(); recovered != nil {
+		logging.Errorf("panic: %v\n%s", recovered, debug.Stack())
+		*err = fmt.Errorf("panic: %v", recovered)
+	}
+}
+
 // NewParallelExecutor creates a new executor from a parallel of other executors
 func NewParallelExecutor(parallel int, executors ...Executor) Executor {
 	if len(executors) == 0 {
@@ -74,34 +77,29 @@ func NewParallelExecutor(parallel int, executors ...Executor) Executor {
 		errs := make(chan error, len(executors))
 
 		if 1 > parallel {
-			log.Debugf("Parallel tasks (%d) below minimum, setting to 1", parallel)
+			logging.Debugf("Parallel tasks (%d) below minimum, setting to 1", parallel)
 			parallel = 1
 		}
 
-		log.Infof("NewParallelExecutor: Creating %d workers for %d executors", parallel, len(executors))
+		logging.Infof("NewParallelExecutor: Creating %d workers for %d executors", parallel, len(executors))
 
-		for i := 0; i < parallel; i++ {
-			go func(workerID int, work <-chan Executor, errs chan<- error) {
-				log.Debugf("Worker %d started", workerID)
+		for workerID := range parallel {
+			go func() {
+				logging.Debugf("Worker %d started", workerID)
 				taskCount := 0
 				for executor := range work {
 					taskCount++
-					log.Debugf("Worker %d executing task %d", workerID, taskCount)
+					logging.Debugf("Worker %d executing task %d", workerID, taskCount)
 					// Recover from panics in executors to avoid crashing the worker
 					// goroutine which would leave the runner process hung.
 					// https://gitea.com/gitea/runner/issues/371
 					errs <- func() (err error) {
-						defer func() {
-							if r := recover(); r != nil {
-								log.Errorf("panic in executor: %v\n%s", r, debug.Stack())
-								err = fmt.Errorf("panic: %v", r)
-							}
-						}()
+						defer RecoverPanic(&err)
 						return executor(ctx)
 					}()
 				}
-				log.Debugf("Worker %d finished (%d tasks executed)", workerID, taskCount)
-			}(i, work, errs)
+				logging.Debugf("Worker %d finished (%d tasks executed)", workerID, taskCount)
+			}()
 		}
 
 		for i := range executors {
@@ -150,12 +148,7 @@ func (e Executor) If(conditional Conditional) Executor {
 
 // IfNot only runs this executor if conditional is true
 func (e Executor) IfNot(conditional Conditional) Executor {
-	return func(ctx context.Context) error {
-		if !conditional(ctx) {
-			return e(ctx)
-		}
-		return nil
-	}
+	return e.If(func(ctx context.Context) bool { return !conditional(ctx) })
 }
 
 // IfBool only runs this executor if conditional is true
@@ -171,7 +164,10 @@ func (e Executor) Finally(finally Executor) Executor {
 		err := e(ctx)
 		err2 := finally(ctx)
 		if err2 != nil {
-			return fmt.Errorf("error occurred running finally: %v (original error: %v)", err2, err)
+			if err != nil {
+				return fmt.Errorf("error occurred running finally: %w (original error: %w)", err2, err)
+			}
+			return fmt.Errorf("error occurred running finally: %w (original error: %v)", err2, err)
 		}
 		return err
 	}

act/common/executor_test.go

@@ -7,8 +7,7 @@ package common
 import (
 	"context"
 	"errors"
-	"reflect"
-	"strings"
+	"fmt"
 	"sync"
 	"sync/atomic"
 	"testing"
@@ -18,42 +17,25 @@ import (
 )
 
 func TestNewWorkflow(t *testing.T) {
-	assert := assert.New(t)
+	ctx := t.Context()
+	require.NoError(t, NewPipelineExecutor()(ctx))
+	require.EqualError(t, NewErrorExecutor(errors.New("test error"))(ctx), "test error")
 
-	ctx := context.Background()
-
-	// empty
-	emptyWorkflow := NewPipelineExecutor()
-	assert.NoError(emptyWorkflow(ctx)) //nolint:testifylint // pre-existing issue from nektos/act
-
-	// error case
-	errorWorkflow := NewErrorExecutor(errors.New("test error"))
-	assert.Error(errorWorkflow(ctx)) //nolint:testifylint // pre-existing issue from nektos/act
-
-	// multiple success case
 	runcount := 0
-	successWorkflow := NewPipelineExecutor(
-		func(ctx context.Context) error {
-			runcount++
-			return nil
-		},
-		func(ctx context.Context) error {
-			runcount++
-			return nil
-		})
-	assert.NoError(successWorkflow(ctx)) //nolint:testifylint // pre-existing issue from nektos/act
-	assert.Equal(2, runcount)
+	increment := func(_ctx context.Context) error {
+		runcount++
+		return nil
+	}
+	require.NoError(t, NewPipelineExecutor(increment, increment)(ctx))
+	assert.Equal(t, 2, runcount)
 }
 
-// concurrencyProbe returns an executor recording the peak number of concurrent copies. Copies
-// block until wantActive are in flight so the peak is exact without sleeping, and later copies
-// find the gate already open so the last one still finishes with no partner left.
 func concurrencyProbe(wantActive int32) (exec Executor, count, maxActive *atomic.Int32) {
 	var counted, active, peak atomic.Int32
 	var once sync.Once
 	reached := make(chan struct{})
 
-	return func(ctx context.Context) error {
+	return func(_ctx context.Context) error {
 		counted.Add(1)
 		running := active.Add(1)
 		for {
@@ -72,93 +54,72 @@ func concurrencyProbe(wantActive int32) (exec Executor, count, maxActive *atomic
 }
 
 func TestNewParallelExecutor(t *testing.T) {
-	ctx := context.Background()
-
-	exec, count, maxActive := concurrencyProbe(2)
-	require.NoError(t, NewParallelExecutor(2, exec, exec, exec)(ctx))
-	assert.Equal(t, int32(3), count.Load(), "should run all 3 executors")
-	assert.Equal(t, int32(2), maxActive.Load(), "should run at most 2 executors in parallel")
-
-	// parallelism below 1 falls back to a single worker
-	exec, count, maxActive = concurrencyProbe(1)
-	require.NoError(t, NewParallelExecutor(0, exec, exec, exec)(ctx))
-	assert.Equal(t, int32(3), count.Load(), "should run all 3 executors")
-	assert.Equal(t, int32(1), maxActive.Load(), "should run at most 1 executor in parallel")
+	for name, parallel := range map[string]int{"parallel": 2, "below minimum": 0} {
+		t.Run(name, func(t *testing.T) {
+			exec, count, maxActive := concurrencyProbe(int32(max(1, parallel)))
+			require.NoError(t, NewParallelExecutor(parallel, exec, exec, exec)(t.Context()))
+			assert.Equal(t, int32(3), count.Load())
+			assert.Equal(t, int32(max(1, parallel)), maxActive.Load())
+		})
+	}
 }
 
 func TestNewParallelExecutorEmpty(t *testing.T) {
 	assert := assert.New(t)
 
-	ctx := context.Background()
+	ctx := t.Context()
 	require.NoError(t, NewParallelExecutor(2)(ctx))
 
-	canceledCtx, cancel := context.WithCancel(context.Background())
+	canceledCtx, cancel := context.WithCancel(t.Context())
 	cancel()
 
 	err := NewParallelExecutor(2)(canceledCtx)
 	assert.ErrorIs(err, context.Canceled)
 }
 
-func TestNewParallelExecutorFailed(t *testing.T) {
-	assert := assert.New(t)
-
-	ctx, cancel := context.WithCancel(context.Background())
-	cancel()
-
-	count := 0
-	errorWorkflow := NewPipelineExecutor(func(ctx context.Context) error {
-		count++
-		return errors.New("fake error")
-	})
-	err := NewParallelExecutor(1, errorWorkflow)(ctx)
-	assert.Equal(1, count)
-	assert.ErrorIs(context.Canceled, err)
-}
-
-func TestNewParallelExecutorCanceled(t *testing.T) {
-	assert := assert.New(t)
-
-	ctx, cancel := context.WithCancel(context.Background())
-	cancel()
-
-	errExpected := errors.New("fake error")
-
-	var count atomic.Int32
-	successWorkflow := NewPipelineExecutor(func(ctx context.Context) error {
-		count.Add(1)
-		return nil
-	})
-	errorWorkflow := NewPipelineExecutor(func(ctx context.Context) error {
-		count.Add(1)
-		return errExpected
-	})
-	err := NewParallelExecutor(3, errorWorkflow, successWorkflow, successWorkflow)(ctx)
-	assert.Equal(int32(3), count.Load())
-	assert.Error(errExpected, err) //nolint:testifylint // pre-existing issue from nektos/act
-}
-
-func TestNewParallelExecutorRunsRemainingAfterFailure(t *testing.T) {
-	var successCount atomic.Int32
-	executors := make([]Executor, 5)
-	for i := range executors {
-		executors[i] = func(ctx context.Context) error {
-			if i == 2 {
-				return errors.New("fake error")
+func TestNewParallelExecutorRunsAllTasksAfterFailureOrCancellation(t *testing.T) {
+	for name, tc := range map[string]struct {
+		canceled        bool
+		parallel, tasks int
+	}{
+		"failure":              {false, 2, 5},
+		"canceled":             {true, 2, 5},
+		"canceled single task": {true, 1, 1},
+	} {
+		t.Run(name, func(t *testing.T) {
+			ctx, cancel := context.WithCancel(t.Context())
+			defer cancel()
+			if tc.canceled {
+				cancel()
+			}
+			var calls atomic.Int32
+			executors := make([]Executor, tc.tasks)
+			for i := range executors {
+				executors[i] = func(_ctx context.Context) error {
+					calls.Add(1)
+					if i == tc.tasks/2 {
+						return errors.New("fake error")
+					}
+					return nil
+				}
 			}
-			successCount.Add(1)
-			return nil
-		}
-	}
 
-	require.Error(t, NewParallelExecutor(2, executors...)(context.Background()))
-	assert.Equal(t, int32(4), successCount.Load(), "a failing executor must not stop the others")
+			err := NewParallelExecutor(tc.parallel, executors...)(ctx)
+			if tc.canceled {
+				require.ErrorIs(t, err, context.Canceled)
+			} else {
+				require.EqualError(t, err, "fake error")
+			}
+			assert.Equal(t, int32(tc.tasks), calls.Load())
+		})
+	}
 }
 
 func TestExecutorConditionalsAndFinally(t *testing.T) {
-	ctx := context.Background()
+	ctx := t.Context()
 	var calls []string
 	record := func(name string) Executor {
-		return func(ctx context.Context) error {
+		return func(_ctx context.Context) error {
 			calls = append(calls, name)
 			return nil
 		}
@@ -170,19 +131,17 @@ func TestExecutorConditionalsAndFinally(t *testing.T) {
 	require.NoError(t, record("if-bool").IfBool(true)(ctx))
 	require.NoError(t, record("main").Finally(record("finally"))(ctx))
 
-	want := []string{"if-true", "if-not", "if-bool", "main", "finally"}
-	if !reflect.DeepEqual(calls, want) {
-		t.Fatalf("calls = %v, want %v", calls, want)
-	}
+	assert.Equal(t, []string{"if-true", "if-not", "if-bool", "main", "finally"}, calls)
 }
 
 func TestExecutorFinallyReturnsFinallyErrorWithOriginal(t *testing.T) {
-	mainErr := errors.New("main failed")
 	finalErr := errors.New("cleanup failed")
-
-	err := NewErrorExecutor(mainErr).Finally(NewErrorExecutor(finalErr))(context.Background())
-	require.Error(t, err)
-	if !strings.Contains(err.Error(), "cleanup failed") || !strings.Contains(err.Error(), "main failed") {
-		t.Fatalf("finally error = %q, want both cleanup and original error", err)
+	for _, mainErr := range []error{context.Canceled, nil} {
+		err := NewErrorExecutor(mainErr).Finally(NewErrorExecutor(finalErr))(t.Context())
+		require.EqualError(t, err, fmt.Sprintf("error occurred running finally: cleanup failed (original error: %v)", mainErr))
+		require.ErrorIs(t, err, finalErr)
+		if mainErr != nil {
+			require.ErrorIs(t, err, mainErr)
+		}
 	}
 }

act/common/git/fetch_action.go

@@ -0,0 +1,509 @@
+// Copyright 2026 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package git
+
+import (
+	"archive/tar"
+	"bytes"
+	"compress/gzip"
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"math/rand/v2"
+	"net"
+	"net/http"
+	"net/url"
+	"os"
+	"path/filepath"
+	"reflect"
+	"runtime"
+	"strconv"
+	"strings"
+	"sync"
+	"time"
+
+	"gitea.com/gitea/runner/act/common"
+)
+
+var actionFetches sync.Map
+
+var symlink = (*os.Root).Symlink
+
+var symlinkFallback = runtime.GOOS == "windows"
+
+const treeSizes = ".sizes" // beside the tree rather than in it, which is copied into job containers as it is
+
+type treeFile struct {
+	Name []byte // not a string, which JSON would turn into UTF-8, as git allows any bytes but NUL
+	Size int64
+}
+
+type actionFetch struct {
+	done     chan struct{}
+	dir, sha string
+	err      error
+	retry    bool // the leader was cancelled or panicked, so followers fetch themselves
+}
+
+var archiveRetryDelay = func(retryAfter string) time.Duration { // as actions/runner backs off
+	if seconds, err := strconv.Atoi(retryAfter); err == nil {
+		return min(max(time.Duration(seconds)*time.Second, 10*time.Second), 10*time.Minute)
+	}
+	return time.Duration(10+rand.IntN(21)) * time.Second
+}
+
+func FetchAction(ctx context.Context, input NewGitCloneExecutorInput) (string, string, error) { // input.Dir is one clone URL and ref's, holding a directory per commit
+	if !reflect.ValueOf(input).Comparable() {
+		return fetchAction(ctx, input)
+	}
+	for ctx.Err() == nil {
+		call := &actionFetch{done: make(chan struct{}), retry: true}
+		previous, loaded := actionFetches.LoadOrStore(input, call)
+		if !loaded {
+			func() {
+				defer func() { actionFetches.Delete(input); close(call.done) }()
+				call.dir, call.sha, call.err = fetchAction(ctx, input)
+				call.retry = ctx.Err() != nil
+			}()
+			if call.retry {
+				continue
+			}
+			return call.dir, call.sha, call.err
+		}
+		call, _ = previous.(*actionFetch)
+		select {
+		case <-ctx.Done():
+		case <-call.done:
+			if !call.retry && ctx.Err() == nil {
+				return call.dir, call.sha, call.err
+			}
+		}
+	}
+	return "", "", ctx.Err()
+}
+
+func fetchAction(ctx context.Context, input NewGitCloneExecutorInput) (string, string, error) {
+	unlock, err := AcquireCloneLock(ctx, input.Dir)
+	if err != nil {
+		return "", "", err
+	}
+	defer unlock()
+	if err := os.MkdirAll(input.Dir, 0o755); err != nil {
+		return "", "", err
+	}
+
+	tree := func(sha string) string { return filepath.Join(input.Dir, sha) }
+	record := filepath.Join(input.Dir, "ref")
+	data, _ := os.ReadFile(record)
+	sha, etag, _ := strings.Cut(string(data), "\n")
+	switch {
+	case !isFullObjectID(sha):
+		sha, etag = "", ""
+	case input.OfflineMode && exists(tree(sha)) && !exists(tree(sha)+treeSizes):
+		return tree(sha), sha, nil // from an older runner, with no sizes to check, so offline mode uses it as before
+	case !treeIntact(input.Dir, sha):
+		sha, etag = "", ""
+	case input.OfflineMode || isFullObjectID(input.Ref):
+		return tree(sha), sha, nil
+	}
+
+	newSha, newEtag, err := downloadArchive(ctx, input, sha, etag)
+	if err != nil && ctx.Err() == nil {
+		common.Logger(ctx).Debugf("Cloning %s@%s: %v", input.URL, input.Ref, err)
+		newEtag = ""
+		newSha, err = exportClone(ctx, input)
+	}
+	if err != nil {
+		return "", "", err
+	}
+	if newSha != sha || newEtag != etag {
+		if err := os.WriteFile(record, []byte(newSha+"\n"+newEtag), 0o600); err != nil {
+			return "", "", err
+		}
+	}
+	return tree(newSha), newSha, nil
+}
+
+func downloadArchive(ctx context.Context, input NewGitCloneExecutorInput, sha, etag string) (string, string, error) {
+	rewritten, err := gitOutput(ctx, "", "ls-remote", "--get-url", input.URL)
+	if err != nil {
+		return "", "", err
+	}
+	source, err := url.Parse(rewritten)
+	if err != nil || source.Scheme != "http" && source.Scheme != "https" || hexRefRegex.MatchString(input.Ref) && !isFullObjectID(input.Ref) { // only git tells a short commit from a branch
+		return "", "", errors.New("no archive")
+	}
+	archive := source.JoinPath("archive", input.Ref+".tar.gz")
+	if source.Host == "github.com" {
+		source.Host = "codeload.github.com"
+		archive = source.JoinPath("tar.gz", input.Ref)
+	}
+	client := &http.Client{Transport: input.Transport, Timeout: 5 * time.Minute, CheckRedirect: func(request *http.Request, via []*http.Request) error {
+		if len(via) >= 10 {
+			return errors.New("stopped after 10 redirects")
+		}
+		if request.URL.Host != via[0].URL.Host || request.URL.Scheme != via[0].URL.Scheme { // the token stays on its origin
+			request.Header.Del("Authorization")
+		}
+		return nil
+	}}
+	for attempt := 1; ; attempt++ {
+		newSha, newEtag, retryAfter, err := downloadArchiveOnce(ctx, client, archive.String(), input.Token, sha, etag, input.Dir)
+		if retryAfter == 0 || attempt == 3 || ctx.Err() != nil {
+			return newSha, newEtag, err
+		}
+		common.Logger(ctx).Warnf("Failed to download action '%s'. Error: %v. Back off %s before retry.", archive.Redacted(), err, retryAfter)
+		select {
+		case <-ctx.Done():
+			return "", "", ctx.Err()
+		case <-time.After(retryAfter):
+		}
+	}
+}
+
+func downloadArchiveOnce(ctx context.Context, client *http.Client, archive, token, sha, etag, dir string) (string, string, time.Duration, error) {
+	request, err := http.NewRequestWithContext(ctx, http.MethodGet, archive, nil)
+	if err != nil {
+		return "", "", 0, err
+	}
+	if etag != "" {
+		request.Header.Set("If-None-Match", etag)
+	}
+	if token != "" {
+		request.SetBasicAuth("token", token)
+	}
+	response, err := client.Do(request)
+	if err != nil {
+		var opErr *net.OpError
+		if errors.As(err, &opErr) && opErr.Op == "dial" {
+			return "", "", 0, err
+		}
+		return "", "", archiveRetryDelay(""), err
+	}
+	defer response.Body.Close()
+	switch status := response.StatusCode; {
+	case status == http.StatusNotModified && sha != "":
+		return sha, etag, 0, nil
+	case status == http.StatusOK:
+		newEtag := response.Header.Get("ETag")
+		gz, err := gzip.NewReader(response.Body)
+		if err == nil {
+			sha, err = extractTree(ctx, gz, dir, !strings.HasSuffix(newEtag, `-false"`)) // Gitea's mark of an unprefixed archive
+		}
+		var netErr net.Error
+		if errors.Is(err, io.ErrUnexpectedEOF) || errors.As(err, &netErr) {
+			return "", "", archiveRetryDelay(""), err
+		}
+		return sha, newEtag, 0, err
+	case status == http.StatusRequestTimeout || status == http.StatusTooManyRequests || status >= http.StatusInternalServerError:
+		return "", "", archiveRetryDelay(response.Header.Get("Retry-After")), errors.New(response.Status)
+	default:
+		return "", "", 0, errors.New(response.Status)
+	}
+}
+
+func exportClone(ctx context.Context, input NewGitCloneExecutorInput) (string, error) {
+	clone := input
+	clone.Dir = filepath.Join(input.Dir, "git")
+	sha, _, err := resolveClone(ctx, clone)
+	if err != nil || treeIntact(input.Dir, sha) {
+		return sha, err
+	}
+	archive, err := runGit(ctx, clone.Dir, nil, "archive", "--format=tar", sha)
+	if err != nil {
+		return "", err
+	}
+	_, err = extractTree(ctx, bytes.NewReader(archive), input.Dir, false)
+	return sha, err
+}
+
+func extractTree(ctx context.Context, archive io.Reader, dir string, strip bool) (string, error) { // into dir/<commit of the pax header>, strip dropping the directory wrapping the files
+	temp, err := os.MkdirTemp(dir, "tmp-")
+	if err != nil {
+		return "", err
+	}
+	defer os.RemoveAll(temp)
+	root, err := os.OpenRoot(temp)
+	if err != nil {
+		return "", err
+	}
+	defer root.Close()
+
+	sha := ""
+	sizes := map[string]int64{}
+	links := map[string]string{}
+	var deferred []string
+	reader := tar.NewReader(archive)
+	for {
+		header, err := reader.Next()
+		if errors.Is(err, io.EOF) {
+			break
+		}
+		if err != nil {
+			return "", err
+		}
+		if header.Typeflag == tar.TypeXGlobalHeader {
+			if sha = header.PAXRecords["comment"]; isFullObjectID(sha) && treeIntact(dir, sha) {
+				return sha, nil
+			}
+			continue
+		}
+		name := header.Name
+		if strip {
+			_, name, _ = strings.Cut(name, "/")
+		}
+		if name = strings.TrimSuffix(name, "/"); name == "" {
+			continue
+		}
+		switch header.Typeflag {
+		case tar.TypeDir:
+			err = root.MkdirAll(name, 0o755)
+		case tar.TypeReg:
+			sizes[name], err = writeTreeFile(root, name, header.Mode, reader)
+		case tar.TypeSymlink:
+			links[filepath.Clean(name)] = header.Linkname
+			deferred = append(deferred, filepath.Clean(name))
+		}
+		if err != nil {
+			return "", err
+		}
+	}
+	if !isFullObjectID(sha) {
+		return "", errors.New("the archive names no commit")
+	}
+	linksByParent := map[string][]string{}
+	if symlinkFallback {
+		for name := range links {
+			linksByParent[filepath.Dir(name)] = append(linksByParent[filepath.Dir(name)], filepath.Base(name))
+		}
+	}
+	for requireTarget := symlinkFallback; len(deferred) > 0; {
+		unresolved := deferred[:0]
+		for _, name := range deferred {
+			if err := ctx.Err(); err != nil {
+				return "", err
+			}
+			if requireTarget {
+				if _, err := root.Stat(filepath.Dir(name) + string(filepath.Separator) + links[name]); err != nil {
+					unresolved = append(unresolved, name)
+					continue
+				}
+			}
+			if err := symlink(root, links[name], name); err == nil || !symlinkFallback {
+				if err != nil {
+					return "", err
+				}
+				continue
+			}
+			if err := copyTreeLink(ctx, root, name, links, linksByParent, sizes); err != nil {
+				return "", fmt.Errorf("materialize symlink %q: %w", filepath.ToSlash(name), err)
+			}
+		}
+		if len(unresolved) == len(deferred) {
+			requireTarget = false
+		}
+		deferred = unresolved
+	}
+	if err := root.Close(); err != nil {
+		return "", err
+	}
+	return sha, installTree(ctx, dir, sha, temp, sizes)
+}
+
+func resolveTreeLink(name string, links map[string]string) (string, bool) {
+	if !filepath.IsLocal(name) {
+		return "", false
+	}
+	parts := strings.Split(name, string(filepath.Separator))
+	var resolved []string
+	for count := 0; len(parts) > 0; {
+		part := parts[0]
+		parts = parts[1:]
+		switch part {
+		case "", ".":
+			continue
+		case "..":
+			if len(resolved) == 0 {
+				return "", false
+			}
+			resolved = resolved[:len(resolved)-1]
+			continue
+		}
+		target, ok := links[filepath.Join(append(resolved, part)...)]
+		if !ok {
+			resolved = append(resolved, part)
+			continue
+		}
+		count++
+		if target == "" || os.IsPathSeparator(target[0]) || filepath.VolumeName(target) != "" || count > 255 {
+			return "", false
+		}
+		parts = append(strings.Split(filepath.FromSlash(target), string(filepath.Separator)), parts...)
+	}
+	return filepath.Join(append([]string{"."}, resolved...)...), true
+}
+
+var (
+	errTreeLinkTarget = errors.New("unmaterializable symlink target")
+	errTreeLinkCycle  = fmt.Errorf("cyclic %w", errTreeLinkTarget)
+)
+
+func copyTreeLink(ctx context.Context, root *os.Root, name string, links map[string]string, linksByParent map[string][]string, sizes map[string]int64) error {
+	writeLinkText := func(destination, target string) error { // as git writes links it cannot create
+		if err := root.RemoveAll(destination); err != nil {
+			return err
+		}
+		for written := range sizes {
+			if written == destination || strings.HasPrefix(written, destination+string(filepath.Separator)) {
+				delete(sizes, written)
+			}
+		}
+		size, err := writeTreeFile(root, destination, 0o644, strings.NewReader(target))
+		sizes[destination] = size
+		return err
+	}
+	active := map[string]bool{}
+	var copyTarget func(string, string) error
+	copyTarget = func(source, destination string) error {
+		if err := ctx.Err(); err != nil {
+			return err
+		}
+		source, ok := resolveTreeLink(source, links)
+		if !ok {
+			return errTreeLinkTarget
+		}
+		file, err := root.Open(source)
+		if err != nil {
+			if errors.Is(err, os.ErrNotExist) {
+				return errTreeLinkTarget
+			}
+			return err
+		}
+		defer file.Close()
+		info, err := file.Stat()
+		if err != nil {
+			return err
+		}
+		if info.Mode().IsRegular() {
+			sizes[destination], err = writeTreeFile(root, destination, int64(info.Mode().Perm()), file)
+			return err
+		}
+		if !info.IsDir() {
+			return errTreeLinkTarget
+		}
+		if active[source] {
+			return errTreeLinkCycle
+		}
+		active[source] = true
+		defer delete(active, source)
+		entries, err := file.ReadDir(-1)
+		if err != nil {
+			return err
+		}
+		children := map[string]bool{}
+		for _, entry := range entries {
+			children[entry.Name()] = true
+		}
+		for _, child := range linksByParent[source] {
+			children[child] = true
+		}
+		if err := root.MkdirAll(destination, info.Mode().Perm()); err != nil {
+			return err
+		}
+		for child := range children {
+			childSource, childDestination := filepath.Join(source, child), filepath.Join(destination, child)
+			err := copyTarget(childSource, childDestination)
+			if target, isLink := links[childSource]; isLink && errors.Is(err, errTreeLinkTarget) && !errors.Is(err, errTreeLinkCycle) {
+				err = writeLinkText(childDestination, target)
+			}
+			if err != nil {
+				return err
+			}
+		}
+		return nil
+	}
+	if err := copyTarget(name, name); !errors.Is(err, errTreeLinkTarget) {
+		return err
+	}
+	if err := ctx.Err(); err != nil {
+		return err
+	}
+	return writeLinkText(name, links[name])
+}
+
+var lockTree = AcquireCloneLock // replaced in tests to see installTree wait for a job holding the tree
+
+// installTree moves temp into place as dir/sha, replacing a tree that failed treeIntact.
+func installTree(ctx context.Context, dir, sha, temp string, sizes map[string]int64) error {
+	files := make([]treeFile, 0, len(sizes))
+	for name, size := range sizes {
+		files = append(files, treeFile{[]byte(name), size})
+	}
+	data, err := json.Marshal(files)
+	if err != nil {
+		return err
+	}
+	// Written before the swap: it describes the commit, not a copy of it, so it holds for whichever tree is left.
+	if err := os.WriteFile(filepath.Join(dir, sha+treeSizes), data, 0o600); err != nil { // a torn record fails treeIntact, so it needs no rename
+		return err
+	}
+	tree := filepath.Join(dir, sha)
+	if !exists(tree) {
+		return os.Rename(temp, tree)
+	}
+	stale, err := os.MkdirTemp(dir, "tmp-")
+	if err != nil {
+		return err
+	}
+	defer os.RemoveAll(stale)          // after the unlock, as no job reads the old tree once it is moved
+	unlock, err := lockTree(ctx, tree) // jobs copying the old tree hold it
+	if err != nil {
+		return err
+	}
+	defer unlock()
+	if err := os.Rename(tree, filepath.Join(stale, sha)); err != nil {
+		return err
+	}
+	return os.Rename(temp, tree)
+}
+
+// treeIntact reports whether dir/sha still holds each file extracted into it at the size it was written.
+// Only sizes are compared, not content: a stat per file is cheap enough for every job, hashing is not.
+func treeIntact(dir, sha string) bool {
+	data, err := os.ReadFile(filepath.Join(dir, sha+treeSizes))
+	if err != nil || !exists(filepath.Join(dir, sha)) {
+		return false
+	}
+	var files []treeFile
+	if json.Unmarshal(data, &files) != nil {
+		return false
+	}
+	for _, file := range files {
+		info, err := os.Lstat(filepath.Join(dir, sha, filepath.FromSlash(string(file.Name))))
+		if err != nil || !info.Mode().IsRegular() || info.Size() != file.Size {
+			return false
+		}
+	}
+	return true
+}
+
+func writeTreeFile(root *os.Root, name string, mode int64, content io.Reader) (int64, error) {
+	perm := os.FileMode(0o644)
+	if mode&0o111 != 0 {
+		perm = 0o755
+	}
+	file, err := root.OpenFile(name, os.O_CREATE|os.O_EXCL|os.O_WRONLY, perm)
+	if err != nil {
+		return 0, err
+	}
+	n, err := io.Copy(file, content)
+	return n, errors.Join(err, file.Close())
+}
+
+func exists(name string) bool {
+	_, err := os.Stat(name)
+	return err == nil
+}

act/common/git/fetch_action_test.go

@@ -0,0 +1,562 @@
+// Copyright 2026 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package git
+
+import (
+	"archive/tar"
+	"bytes"
+	"context"
+	"encoding/base64"
+	"errors"
+	"fmt"
+	"net/http"
+	"net/http/cgi"
+	"net/http/httptest"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"runtime"
+	"strings"
+	"sync"
+	"sync/atomic"
+	"testing"
+	"time"
+
+	"gitea.com/gitea/runner/act/common"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestFetchAction(t *testing.T) {
+	original := archiveRetryDelay
+	archiveRetryDelay = func(_retryAfter string) time.Duration { return time.Nanosecond }
+	t.Cleanup(func() { archiveRetryDelay = original })
+
+	root := t.TempDir()
+	remote := filepath.Join(root, "org", "action")
+	require.NoError(t, gitCmd("init", "--initial-branch=main", remote))
+	require.NoError(t, os.WriteFile(filepath.Join(remote, "action.yml"), []byte("name: action\n"), 0o644))
+	require.NoError(t, os.WriteFile(filepath.Join(remote, "run.sh"), []byte("#!/bin/sh\n"), 0o755))
+	require.NoError(t, os.Symlink("action.yml", filepath.Join(remote, "link")))
+	require.NoError(t, gitCmd("-C", remote, "add", "."))
+	require.NoError(t, gitCmd("-C", remote, "update-index", "--chmod=+x", "run.sh"))
+	require.NoError(t, gitCmd("-C", remote, "commit", "-m", "initial"))
+	require.NoError(t, gitCmd("-C", remote, "tag", "v1"))
+	expectedSha := gitRevParse(t, remote, "main")
+
+	gitPath, err := exec.LookPath("git")
+	require.NoError(t, err)
+	backend := &cgi.Handler{Path: gitPath, Args: []string{"http-backend"}, Env: []string{"GIT_PROJECT_ROOT=" + root, "GIT_HTTP_EXPORT_ALL=1"}}
+	var mu sync.Mutex
+	var archiveRequests []http.Header
+	var mirror *httptest.Server
+	archiveCache := map[string][]byte{}
+	requests, archives, failures := 0, "", 0
+	handler := http.HandlerFunc(func(writer http.ResponseWriter, request *http.Request) {
+		mu.Lock()
+		defer mu.Unlock()
+		requests++
+		ref, ok := strings.CutPrefix(request.URL.Path, "/org/action/archive/")
+		if !ok {
+			backend.ServeHTTP(writer, request)
+			return
+		}
+		archiveRequests = append(archiveRequests, request.Header.Clone())
+		switch {
+		case failures > 0:
+			failures--
+			writer.WriteHeader(http.StatusServiceUnavailable)
+			return
+		case archives == "none":
+			http.NotFound(writer, request)
+			return
+		case archives == "unreachable":
+			http.Redirect(writer, request, "http://127.0.0.1:1"+request.URL.Path, http.StatusFound)
+			return
+		case archives == "redirect" && request.Host != mirror.Listener.Addr().String():
+			http.Redirect(writer, request, mirror.URL+request.URL.Path, http.StatusFound)
+			return
+		}
+		sha, _ := gitOutput(request.Context(), remote, "rev-parse", strings.TrimSuffix(ref, ".tar.gz"))
+		etag := fmt.Sprintf(`W/"%s-tar.gz-%t"`, sha, archives != "unprefixed")
+		if request.Header.Get("If-None-Match") == etag {
+			writer.WriteHeader(http.StatusNotModified)
+			return
+		}
+		args := []string{"archive", "--format=tar.gz", sha}
+		if archives != "unprefixed" {
+			args = append(args, "--prefix=action/")
+		}
+		archiveKey := strings.Join(args, "\x00")
+		archive, ok := archiveCache[archiveKey]
+		if !ok {
+			archive, _ = runGit(request.Context(), remote, nil, args...)
+			archiveCache[archiveKey] = archive
+		}
+		writer.Header().Set("ETag", etag)
+		_, _ = writer.Write(archive)
+	})
+	server := httptest.NewServer(handler)
+	mirror = httptest.NewServer(handler)
+	t.Cleanup(server.Close)
+	t.Cleanup(mirror.Close)
+	serve := func(mode string, failing int) {
+		mu.Lock()
+		defer mu.Unlock()
+		requests, archives, failures, archiveRequests = 0, mode, failing, nil
+	}
+	served := func() (int, []http.Header) {
+		mu.Lock()
+		defer mu.Unlock()
+		return requests, append([]http.Header(nil), archiveRequests...)
+	}
+	newInput := func(ref string) NewGitCloneExecutorInput {
+		return NewGitCloneExecutorInput{URL: server.URL + "/org/action", Ref: ref, Dir: t.TempDir(), Token: "secret"}
+	}
+
+	t.Run("shares identical fetches and isolates cancellation, panics and differing inputs", func(t *testing.T) {
+		for _, scenario := range []string{"shared", "leader cancelled", "leader panics", "different token"} {
+			t.Run(scenario, func(t *testing.T) {
+				serve("prefixed", 0)
+				input := newInput("main")
+				started, release := make(chan struct{}), make(chan struct{})
+				releaseFetches := sync.OnceFunc(func() { close(release) })
+				t.Cleanup(releaseFetches)
+				var once sync.Once
+				var panicked atomic.Bool
+				transport := actionFetchTransport(func(request *http.Request) (*http.Response, error) {
+					once.Do(func() { close(started) })
+					select {
+					case <-request.Context().Done():
+						return nil, request.Context().Err()
+					case <-release:
+					}
+					if scenario == "leader panics" && panicked.CompareAndSwap(false, true) {
+						panic("broken archive")
+					}
+					return http.DefaultTransport.RoundTrip(request)
+				})
+				input.Transport = &transport
+				leaderCtx, cancelLeader := context.WithCancel(t.Context())
+				defer cancelLeader()
+				waiting := &actionFetchContext{Context: t.Context(), waiting: make(chan struct{})}
+				followerInput := input
+				expectedRequests := 1
+				if scenario == "different token" {
+					followerInput.Token, expectedRequests = "other", 2
+				}
+				leaderDone, followerDone := make(chan error, 1), make(chan error, 1)
+				fetch := func(ctx context.Context, input NewGitCloneExecutorInput, done chan<- error) {
+					var err error
+					defer func() { done <- err }()
+					defer common.RecoverPanic(&err)
+					var tree, sha string
+					if tree, sha, err = FetchAction(ctx, input); err == nil {
+						assert.Equal(t, expectedSha, sha)
+						assert.Equal(t, filepath.Join(input.Dir, sha), tree)
+					}
+				}
+				go fetch(leaderCtx, input, leaderDone)
+				<-started
+				go fetch(waiting, followerInput, followerDone)
+				<-waiting.waiting
+				if scenario == "leader cancelled" {
+					cancelLeader()
+					require.ErrorIs(t, <-leaderDone, context.Canceled)
+				}
+				releaseFetches()
+				switch scenario {
+				case "leader cancelled":
+				case "leader panics":
+					require.ErrorContains(t, <-leaderDone, "panic: broken archive")
+				default:
+					require.NoError(t, <-leaderDone)
+				}
+				require.NoError(t, <-followerDone)
+				_, headers := served()
+				assert.Len(t, headers, expectedRequests)
+				if scenario == "different token" {
+					assert.NotEqual(t, headers[0].Get("Authorization"), headers[1].Get("Authorization"))
+				}
+			})
+		}
+	})
+
+	t.Run("downloads, revalidates and follows a moved tag", func(t *testing.T) {
+		serve("prefixed", 0)
+		input := newInput("v1")
+		tree, sha, err := FetchAction(t.Context(), input)
+		require.NoError(t, err)
+		assert.Equal(t, expectedSha, sha)
+		assert.Equal(t, filepath.Join(input.Dir, sha), tree)
+		assert.NoDirExists(t, filepath.Join(tree, ".git"))
+		info, err := os.Stat(filepath.Join(tree, "run.sh"))
+		require.NoError(t, err)
+		if runtime.GOOS != "windows" {
+			assert.EqualValues(t, 0o755, info.Mode().Perm())
+		}
+		link, err := os.Readlink(filepath.Join(tree, "link"))
+		require.NoError(t, err)
+		assert.Equal(t, "action.yml", link)
+
+		again, _, err := FetchAction(t.Context(), input)
+		require.NoError(t, err)
+		assert.Equal(t, tree, again)
+
+		require.NoError(t, gitCmd("-C", remote, "commit", "--allow-empty", "-m", "moved"))
+		require.NoError(t, gitCmd("-C", remote, "tag", "--force", "v1"))
+		expectedSha = gitRevParse(t, remote, "v1")
+		moved, movedSha, err := FetchAction(t.Context(), input)
+		require.NoError(t, err)
+		assert.Equal(t, expectedSha, movedSha)
+		assert.NotEqual(t, tree, moved)
+		assert.FileExists(t, filepath.Join(tree, "action.yml"))
+
+		input.OfflineMode = true
+		_, offlineSha, err := FetchAction(t.Context(), input)
+		require.NoError(t, err)
+		assert.Equal(t, movedSha, offlineSha)
+		require.NoError(t, os.Truncate(filepath.Join(moved, "action.yml"), 4)) // fetched again, offline or not
+		_, _, err = FetchAction(t.Context(), input)
+		require.NoError(t, err)
+		require.NoError(t, os.Remove(moved+treeSizes)) // from an older runner, used as it is offline
+		reused, _, err := FetchAction(t.Context(), input)
+		require.NoError(t, err)
+		assert.Equal(t, moved, reused)
+
+		requests, headers := served()
+		assert.Equal(t, 4, requests)
+		require.Len(t, headers, 4)
+		assert.Equal(t, "Basic "+base64.StdEncoding.EncodeToString([]byte("token:secret")), headers[0].Get("Authorization"))
+		assert.Empty(t, headers[0].Get("If-None-Match"))
+		assert.Equal(t, fmt.Sprintf(`W/"%s-tar.gz-true"`, sha), headers[1].Get("If-None-Match"))
+		assert.Equal(t, headers[1].Get("If-None-Match"), headers[2].Get("If-None-Match"))
+	})
+
+	t.Run("downloads a pinned commit once and rejects a short one", func(t *testing.T) {
+		serve("prefixed", 0)
+		sha := expectedSha
+		input := newInput(sha)
+		for range 2 {
+			tree, got, err := FetchAction(t.Context(), input)
+			require.NoError(t, err)
+			assert.Equal(t, sha, got)
+			assert.FileExists(t, filepath.Join(tree, "action.yml"))
+		}
+		_, _, err := FetchAction(t.Context(), newInput(sha[:7]))
+		require.ErrorIs(t, err, ErrShortRef)
+		_, headers := served()
+		assert.Len(t, headers, 1)
+		assert.NoDirExists(t, filepath.Join(input.Dir, "git"))
+	})
+
+	t.Run("downloads again over a tree whose files changed size or that has no record, not under a job copying it", func(t *testing.T) {
+		sha := gitRevParse(t, remote, "main")
+		for _, mode := range []string{"prefixed", "none"} {
+			serve(mode, 0)
+			input := newInput(sha)
+			tree, _, err := FetchAction(t.Context(), input)
+			require.NoError(t, err, mode)
+			yml := filepath.Join(tree, "action.yml")
+			require.NoError(t, os.WriteFile(filepath.Join(tree, "trampoline.js"), nil, 0o644)) // the runner's own, no damage
+			_, _, err = FetchAction(t.Context(), input)
+			require.NoError(t, err, mode)
+			for _, damage := range []func() error{
+				func() error { return os.Truncate(yml, 4) },
+				func() error { return os.Remove(tree + treeSizes) },
+			} {
+				require.NoError(t, damage(), mode)
+				_, _, err := FetchAction(t.Context(), input)
+				require.NoError(t, err, mode)
+				body, err := os.ReadFile(yml)
+				require.NoError(t, err, mode)
+				assert.Equal(t, "name: action\n", string(body), mode)
+			}
+			_, headers := served()
+			assert.Len(t, headers, 3, mode)
+		}
+
+		serve("prefixed", 0)
+		input := newInput(sha)
+		tree, _, err := FetchAction(t.Context(), input)
+		require.NoError(t, err)
+		yml := filepath.Join(tree, "action.yml")
+		require.NoError(t, os.Truncate(yml, 4))
+		unlock, err := AcquireCloneLock(t.Context(), tree)
+		require.NoError(t, err)
+		release := sync.OnceFunc(unlock)
+		defer release()
+		waiting := make(chan struct{})
+		lockTree = func(ctx context.Context, dir string) (func(), error) {
+			close(waiting)
+			return AcquireCloneLock(ctx, dir)
+		}
+		t.Cleanup(func() { lockTree = AcquireCloneLock })
+		done := make(chan error, 1)
+		go func() {
+			_, _, err := FetchAction(t.Context(), input)
+			done <- err
+		}()
+		select {
+		case err := <-done:
+			t.Fatalf("FetchAction replaced the tree without waiting for the job holding it: %v", err)
+		case <-waiting:
+		}
+		info, err := os.Stat(yml)
+		require.NoError(t, err)
+		assert.Equal(t, int64(4), info.Size(), "the tree a job holds is left alone")
+		release()
+		require.NoError(t, <-done)
+		body, err := os.ReadFile(yml)
+		require.NoError(t, err)
+		assert.Equal(t, "name: action\n", string(body))
+	})
+
+	t.Run("retries a failing download and drops the token on a redirect to another origin", func(t *testing.T) {
+		serve("redirect", 2)
+		input := newInput("main")
+		_, sha, err := FetchAction(t.Context(), input)
+		require.NoError(t, err)
+		assert.Equal(t, expectedSha, sha)
+		assert.NoDirExists(t, filepath.Join(input.Dir, "git"))
+		_, headers := served()
+		require.Len(t, headers, 4)
+		assert.NotEmpty(t, headers[2].Get("Authorization"))
+		assert.Empty(t, headers[3].Get("Authorization"))
+	})
+
+	t.Run("keeps an unprefixed archive whole, downloads where insteadOf points and exports a clone without an archive or from an unreachable host", func(t *testing.T) {
+		for _, mode := range []string{"unprefixed", "none", "unreachable"} {
+			serve(mode, 0)
+			tree, sha, err := FetchAction(t.Context(), newInput("main"))
+			require.NoError(t, err, mode)
+			assert.Equal(t, expectedSha, sha, mode)
+			assert.FileExists(t, filepath.Join(tree, "action.yml"), mode)
+			assert.NoDirExists(t, filepath.Join(tree, ".git"), mode)
+			_, headers := served()
+			assert.Len(t, headers, 1, mode)
+		}
+
+		serve("prefixed", 0)
+		config := filepath.Join(t.TempDir(), "gitconfig")
+		require.NoError(t, os.WriteFile(config, []byte("[url \""+server.URL+"/org/\"]\n\tinsteadOf = https://example.invalid/org/\n"), 0o644))
+		t.Setenv("GIT_CONFIG_GLOBAL", config)
+		input := newInput("main")
+		input.URL = "https://example.invalid/org/action"
+		_, sha, err := FetchAction(t.Context(), input)
+		require.NoError(t, err)
+		assert.Equal(t, expectedSha, sha)
+		_, headers := served()
+		assert.Len(t, headers, 1)
+		assert.NoDirExists(t, filepath.Join(input.Dir, "git"))
+	})
+}
+
+type actionFetchTransport func(*http.Request) (*http.Response, error)
+
+func (transport actionFetchTransport) RoundTrip(request *http.Request) (*http.Response, error) {
+	return transport(request)
+}
+
+type actionFetchContext struct {
+	context.Context
+	waiting chan struct{}
+	once    sync.Once
+}
+
+func (ctx *actionFetchContext) Done() <-chan struct{} {
+	ctx.once.Do(func() { close(ctx.waiting) })
+	return ctx.Context.Done()
+}
+
+func TestExtractTreeConfinesEntries(t *testing.T) {
+	outside := t.TempDir()
+	for name, entries := range map[string][]*tar.Header{
+		"parent path":       {{Name: "../escape", Typeflag: tar.TypeReg}},
+		"through a symlink": {{Name: "out", Typeflag: tar.TypeSymlink, Linkname: outside}, {Name: "out/escape", Typeflag: tar.TypeReg}},
+	} {
+		t.Run(name, func(t *testing.T) {
+			var archive bytes.Buffer
+			writer := tar.NewWriter(&archive)
+			require.NoError(t, writer.WriteHeader(&tar.Header{Typeflag: tar.TypeXGlobalHeader, PAXRecords: map[string]string{"comment": strings.Repeat("a", 40)}}))
+			for _, entry := range entries {
+				require.NoError(t, writer.WriteHeader(entry))
+			}
+			require.NoError(t, writer.Close())
+
+			dir := t.TempDir()
+			_, err := extractTree(t.Context(), &archive, dir, false)
+			require.Error(t, err)
+			assert.NoFileExists(t, filepath.Join(dir, "escape"))
+			assert.NoFileExists(t, filepath.Join(outside, "escape"))
+		})
+	}
+}
+
+func TestExtractTreeCopiesDeferredLinks(t *testing.T) {
+	originalSymlink, originalFallback := symlink, symlinkFallback
+	symlink = func(_root *os.Root, _target, _name string) error { return errors.New("symlink privilege unavailable") }
+	symlinkFallback = true
+	t.Cleanup(func() { symlink, symlinkFallback = originalSymlink, originalFallback })
+
+	for _, test := range []struct {
+		name  string
+		links [][2]string
+		files []string
+		text  bool
+	}{
+		{name: "file chain", links: [][2]string{{"index.js", "entry.js"}, {"entry.js", "dist/index.js"}}, files: []string{"index.js", "entry.js"}},
+		{name: "directory chain", links: [][2]string{{"lib", "bundle"}, {"bundle", "dist"}, {"dist/entry.js", "index.js"}}, files: []string{"lib/index.js", "lib/entry.js", "lib/nested/index.js", "bundle/index.js", "bundle/entry.js", "bundle/nested/index.js"}},
+		{name: "directory in target path", links: [][2]string{{"index.js", "bundle/nested/index.js"}, {"bundle", "dist"}}, files: []string{"index.js", "bundle/nested/index.js"}},
+		{name: "parent after directory link", links: [][2]string{{"index.js", "bundle/../index.js"}, {"bundle", "dist/nested"}}, files: []string{"index.js", "bundle/index.js"}},
+		{name: "outside", links: [][2]string{{"index.js", "../outside.js"}}, text: true},
+		{name: "absolute", links: [][2]string{{"index.js", t.TempDir()}}, text: true},
+		{name: "dangling", links: [][2]string{{"index.js", "missing.js"}}, text: true},
+		{name: "dangling child of directory link", links: [][2]string{{"lib", "dist"}, {"dist/optional", "missing.js"}}, files: []string{"lib/index.js", "lib/nested/index.js"}},
+		{name: "cycle", links: [][2]string{{"index.js", "entry.js"}, {"entry.js", "index.js"}}, text: true},
+		{name: "directory cycle", links: [][2]string{{"dist/loop", "."}}, text: true},
+	} {
+		t.Run(test.name, func(t *testing.T) {
+			sha := strings.Repeat("a", 40)
+			var archive bytes.Buffer
+			writer := tar.NewWriter(&archive)
+			require.NoError(t, writer.WriteHeader(&tar.Header{Typeflag: tar.TypeXGlobalHeader, PAXRecords: map[string]string{"comment": sha}}))
+			require.NoError(t, writer.WriteHeader(&tar.Header{Name: "dist", Typeflag: tar.TypeDir, Mode: 0o755}))
+			require.NoError(t, writer.WriteHeader(&tar.Header{Name: "dist/nested", Typeflag: tar.TypeDir, Mode: 0o755}))
+			for _, link := range test.links {
+				require.NoError(t, writer.WriteHeader(&tar.Header{Name: link[0], Typeflag: tar.TypeSymlink, Linkname: link[1]}))
+			}
+			content := "console.log('action');\n"
+			for _, name := range []string{"dist/index.js", "dist/nested/index.js"} {
+				require.NoError(t, writer.WriteHeader(&tar.Header{Name: name, Typeflag: tar.TypeReg, Mode: 0o755, Size: int64(len(content))}))
+				_, err := writer.Write([]byte(content))
+				require.NoError(t, err)
+			}
+			require.NoError(t, writer.Close())
+
+			dir := t.TempDir()
+			_, err := extractTree(t.Context(), &archive, dir, false)
+			require.NoError(t, err)
+			assert.True(t, treeIntact(dir, sha))
+			if test.text {
+				for _, link := range test.links {
+					data, err := os.ReadFile(filepath.Join(dir, sha, link[0]))
+					require.NoError(t, err)
+					assert.Equal(t, link[1], string(data))
+					info, err := os.Lstat(filepath.Join(dir, sha, link[0]))
+					require.NoError(t, err)
+					assert.True(t, info.Mode().IsRegular())
+				}
+			}
+			for _, name := range test.files {
+				data, err := os.ReadFile(filepath.Join(dir, sha, name))
+				require.NoError(t, err)
+				assert.Equal(t, content, string(data))
+				info, err := os.Lstat(filepath.Join(dir, sha, name))
+				require.NoError(t, err)
+				assert.True(t, info.Mode().IsRegular())
+				if runtime.GOOS != "windows" {
+					assert.Equal(t, os.FileMode(0o755), info.Mode().Perm())
+				}
+				require.NoError(t, os.WriteFile(filepath.Join(dir, sha, name), nil, 0o644))
+				assert.False(t, treeIntact(dir, sha), name)
+				require.NoError(t, os.WriteFile(filepath.Join(dir, sha, name), []byte(content), 0o755))
+			}
+		})
+	}
+}
+
+func TestTreeIntactFindsNamesThatAreNotUTF8(t *testing.T) {
+	if runtime.GOOS != "linux" {
+		t.Skip("macOS and Windows store no name that is not UTF-8")
+	}
+	sha := strings.Repeat("a", 40)
+	var archive bytes.Buffer
+	writer := tar.NewWriter(&archive)
+	require.NoError(t, writer.WriteHeader(&tar.Header{Typeflag: tar.TypeXGlobalHeader, PAXRecords: map[string]string{"comment": sha}}))
+	require.NoError(t, writer.WriteHeader(&tar.Header{Name: "caf\xe9.js", Typeflag: tar.TypeReg, Mode: 0o644, Size: 1, Format: tar.FormatGNU}))
+	_, err := writer.Write([]byte("x"))
+	require.NoError(t, err)
+	require.NoError(t, writer.Close())
+
+	dir := t.TempDir()
+	_, err = extractTree(t.Context(), &archive, dir, false)
+	require.NoError(t, err)
+	require.FileExists(t, filepath.Join(dir, sha, "caf\xe9.js"))
+	assert.True(t, treeIntact(dir, sha))
+}
+
+func TestExtractTreeCreatesLinksInPlatformOrder(t *testing.T) {
+	if runtime.GOOS == "windows" {
+		t.Skip("requires symlink privileges")
+	}
+	original, originalFallback := symlink, symlinkFallback
+	var created []string
+	symlink = func(root *os.Root, target, name string) error {
+		created = append(created, name)
+		return root.Symlink(target, name)
+	}
+	t.Cleanup(func() { symlink, symlinkFallback = original, originalFallback })
+
+	var archive bytes.Buffer
+	writer := tar.NewWriter(&archive)
+	require.NoError(t, writer.WriteHeader(&tar.Header{Typeflag: tar.TypeXGlobalHeader, PAXRecords: map[string]string{"comment": strings.Repeat("a", 40)}}))
+	for _, entry := range []*tar.Header{
+		{Name: "a", Typeflag: tar.TypeSymlink, Linkname: "b"},
+		{Name: "b", Typeflag: tar.TypeSymlink, Linkname: "dist"},
+		{Name: "dangling", Typeflag: tar.TypeSymlink, Linkname: "missing"},
+		{Name: "dist", Typeflag: tar.TypeDir, Mode: 0o755},
+	} {
+		require.NoError(t, writer.WriteHeader(entry))
+	}
+	require.NoError(t, writer.Close())
+	for _, test := range []struct {
+		name     string
+		fallback bool
+		want     []string
+	}{
+		{name: "native", want: []string{"a", "b", "dangling"}},
+		{name: "fallback", fallback: true, want: []string{"b", "a", "dangling"}},
+	} {
+		t.Run(test.name, func(t *testing.T) {
+			symlinkFallback = test.fallback
+			created = nil
+			_, err := extractTree(t.Context(), bytes.NewReader(archive.Bytes()), t.TempDir(), false)
+			require.NoError(t, err)
+			assert.Equal(t, test.want, created)
+		})
+	}
+}
+
+func TestCopyTreeLinkCancellationBetweenEntries(t *testing.T) {
+	root, err := os.OpenRoot(t.TempDir())
+	require.NoError(t, err)
+	defer root.Close()
+	require.NoError(t, root.Mkdir("source", 0o755))
+	for _, name := range []string{"first", "second"} {
+		_, err := writeTreeFile(root, filepath.Join("source", name), 0o644, strings.NewReader("content"))
+		require.NoError(t, err)
+	}
+	sizes := map[string]int64{}
+	ctx, cancel := context.WithCancel(t.Context())
+	defer cancel()
+	observed := &treeCopyContext{Context: ctx, check: func() {
+		if len(sizes) == 1 {
+			cancel()
+		}
+	}}
+	require.ErrorIs(t, copyTreeLink(observed, root, "copy", map[string]string{"copy": "source"}, nil, sizes), context.Canceled)
+	assert.Len(t, sizes, 1)
+}
+
+type treeCopyContext struct {
+	context.Context
+	check func()
+}
+
+func (ctx *treeCopyContext) Err() error {
+	ctx.check()
+	return ctx.Context.Err()
+}

act/common/git/git.go

@@ -5,45 +5,71 @@
 package git
 
 import (
+	"bytes"
 	"context"
+	"crypto/sha256"
+	"encoding/base64"
 	"errors"
 	"fmt"
 	"io"
+	"net/http"
+	"net/url"
 	"os"
+	"os/exec"
 	"path"
+	"path/filepath"
 	"regexp"
+	"runtime"
+	"slices"
+	"strconv"
 	"strings"
-	"sync"
+	"time"
 
 	"gitea.com/gitea/runner/act/common"
+	"gitea.com/gitea/runner/act/common/logging"
 	"gitea.com/gitea/runner/internal/pkg/lock"
-
-	"github.com/go-git/go-git/v5"
-	"github.com/go-git/go-git/v5/config"
-	"github.com/go-git/go-git/v5/plumbing"
-	"github.com/go-git/go-git/v5/plumbing/storer"
-	"github.com/go-git/go-git/v5/plumbing/transport/http"
-	"github.com/mattn/go-isatty"
-	log "github.com/sirupsen/logrus"
+	"gitea.com/gitea/runner/internal/pkg/process"
 )
 
 var (
 	codeCommitHTTPRegex = regexp.MustCompile(`^https?://git-codecommit\.(.+)\.amazonaws.com/v1/repos/(.+)$`)
 	codeCommitSSHRegex  = regexp.MustCompile(`ssh://git-codecommit\.(.+)\.amazonaws.com/v1/repos/(.+)$`)
-	githubHTTPRegex     = regexp.MustCompile(`^https?://.*github.com.*/(.+)/(.+?)(?:.git)?$`)
-	githubSSHRegex      = regexp.MustCompile(`github.com[:/](.+)/(.+?)(?:.git)?$`)
+	hexRefRegex         = regexp.MustCompile(`^[0-9a-fA-F]+$`)
+
+	LocalEnvVars = []string{ // `git rev-parse --local-env-vars`, inherited ones point git at another repository
+		"GIT_ALTERNATE_OBJECT_DIRECTORIES", "GIT_CONFIG", "GIT_CONFIG_PARAMETERS", "GIT_CONFIG_COUNT", "GIT_OBJECT_DIRECTORY",
+		"GIT_DIR", "GIT_WORK_TREE", "GIT_IMPLICIT_WORK_TREE", "GIT_GRAFT_FILE", "GIT_INDEX_FILE", "GIT_NO_REPLACE_OBJECTS",
+		"GIT_REPLACE_REF_BASE", "GIT_PREFIX", "GIT_SHALLOW_FILE", "GIT_COMMON_DIR",
+	}
 
 	cloneLocks lock.Keyed[string] // key: clone target directory
 
 	ErrShortRef = errors.New("short SHA references are not supported")
 )
 
-// AcquireCloneLock returns an unlock function after locking the per-directory mutex for dir.
-// Only concurrent operations targeting the same directory are serialized; clones into different directories run in parallel.
-// Callers reading files inside dir (e.g. tarring a checked-out action into a job container) must hold this lock too,
-// otherwise a concurrent NewGitCloneExecutor on the same dir can mutate the worktree mid-read.
-func AcquireCloneLock(dir string) func() {
-	return cloneLocks.Lock(dir)
+// AcquireCloneLock serializes access to dir across runner processes, or within this one where no lock file can be created. Readers of dir must hold it too.
+func AcquireCloneLock(ctx context.Context, dir string) (func(), error) {
+	dir = filepath.Clean(dir)
+	if runtime.GOOS == "plan9" {
+		return cloneLocks.Lock(dir), nil
+	}
+	if err := os.MkdirAll(filepath.Dir(dir), 0o755); err != nil {
+		return nil, err
+	}
+	for {
+		release, err := lock.TryLock(dir)
+		if err == nil {
+			return func() { _ = release() }, nil
+		}
+		if !errors.Is(err, lock.ErrLocked) {
+			return cloneLocks.Lock(dir), nil
+		}
+		select {
+		case <-ctx.Done():
+			return nil, ctx.Err()
+		case <-time.After(50 * time.Millisecond):
+		}
+	}
 }
 
 type Error struct {
@@ -51,196 +77,97 @@ type Error struct {
 	commit string
 }
 
-func (e *Error) Error() string {
-	return e.err.Error()
-}
-
-func (e *Error) Unwrap() error {
-	return e.err
-}
-
-func (e *Error) Commit() string {
-	return e.commit
-}
-
-// goGitMu serializes go-git repository access across the process. go-git is not safe for
-// concurrent use of the same repository (even read access decodes packfiles into shared
-// state), so parallel jobs inspecting the shared workdir repo race without this. The guarded
-// operations are fast local reads; gitea runs one job per process, so the lock is effectively
-// uncontended in production.
-var goGitMu sync.Mutex
+func (e *Error) Error() string  { return e.err.Error() }
+func (e *Error) Unwrap() error  { return e.err }
+func (e *Error) Commit() string { return e.commit }
 
 // FindGitRevision get the current git revision
-func FindGitRevision(ctx context.Context, file string) (shortSha, sha string, err error) {
-	goGitMu.Lock()
-	defer goGitMu.Unlock()
-	return findGitRevision(ctx, file)
-}
-
-func findGitRevision(ctx context.Context, file string) (shortSha, sha string, err error) {
+func FindGitRevision(ctx context.Context, file string) (string, error) {
 	logger := common.Logger(ctx)
-
-	gitDir, err := git.PlainOpenWithOptions(
-		file,
-		&git.PlainOpenOptions{
-			DetectDotGit:          true,
-			EnableDotGitCommonDir: true,
-		},
-	)
+	sha, err := gitOutput(ctx, file, "rev-parse", "--verify", "HEAD^{commit}")
 	if err != nil {
 		logger.WithError(err).Error("path", file, "not located inside a git repository")
-		return "", "", err
+		return "", err
 	}
-
-	head, err := gitDir.Reference(plumbing.HEAD, true)
-	if err != nil {
-		return "", "", err
+	if len(sha) < 7 {
+		return "", errors.New("HEAD could not be resolved")
 	}
-
-	if head.Hash().IsZero() {
-		return "", "", errors.New("HEAD sha1 could not be resolved")
-	}
-
-	hash := head.Hash().String()
-
-	logger.Debugf("Found revision: %s", hash)
-	return hash[:7], strings.TrimSpace(hash), nil
+	logger.Debugf("Found revision: %s", sha)
+	return sha, nil
 }
 
 // FindGitRef get the current git ref
 func FindGitRef(ctx context.Context, file string) (string, error) {
-	goGitMu.Lock()
-	defer goGitMu.Unlock()
-
 	logger := common.Logger(ctx)
-
 	logger.Debugf("Loading revision from git directory")
-	_, ref, err := findGitRevision(ctx, file)
+	revision, err := FindGitRevision(ctx, file)
 	if err != nil {
 		return "", err
 	}
+	logger.Debugf("HEAD points to '%s'", revision)
 
-	logger.Debugf("HEAD points to '%s'", ref)
-
-	// Prefer the git library to iterate over the references and find a matching tag or branch.
-	refTag := ""
-	refBranch := ""
-	repo, err := git.PlainOpenWithOptions(
-		file,
-		&git.PlainOpenOptions{
-			DetectDotGit:          true,
-			EnableDotGitCommonDir: true,
-		},
-	)
+	refs, err := gitOutput(ctx, file, "for-each-ref", "--points-at=HEAD", "--format=%(refname)", "refs/tags", "refs/heads")
 	if err != nil {
 		return "", err
 	}
-
-	iter, err := repo.References()
-	if err != nil {
-		return "", err
-	}
-
-	// find the reference that matches the revision's has
-	err = iter.ForEach(func(r *plumbing.Reference) error {
-		/* tags and branches will have the same hash
-		 * when a user checks out a tag, it is not mentioned explicitly
-		 * in the go-git package, we must identify the revision
-		 * then check if any tag matches that revision,
-		 * if so then we checked out a tag
-		 * else we look for branches and if matches,
-		 * it means we checked out a branch
-		 *
-		 * If a branches matches first we must continue and check all tags (all references)
-		 * in case we match with a tag later in the interation
-		 */
-		if r.Hash().String() == ref {
-			if r.Name().IsTag() {
-				refTag = r.Name().String()
-			}
-			if r.Name().IsBranch() {
-				refBranch = r.Name().String()
-			}
+	var tag, branch string
+	for ref := range strings.FieldsSeq(refs) {
+		switch {
+		case strings.HasPrefix(ref, "refs/tags/"):
+			tag = ref
+		case strings.HasPrefix(ref, "refs/heads/"):
+			branch = ref
 		}
-
-		// we found what we where looking for
-		if refTag != "" && refBranch != "" {
-			return storer.ErrStop
-		}
-
-		return nil
-	})
-	if err != nil {
-		return "", err
 	}
-
-	// order matters here see above comment.
-	if refTag != "" {
-		return refTag, nil
+	if tag != "" {
+		return tag, nil
 	}
-	if refBranch != "" {
-		return refBranch, nil
+	if branch != "" {
+		return branch, nil
 	}
-
-	return "", fmt.Errorf("failed to identify reference (tag/branch) for the checked-out revision '%s'", ref)
+	return "", fmt.Errorf("failed to identify reference (tag/branch) for the checked-out revision '%s'", revision)
 }
 
 // FindGithubRepo get the repo
-func FindGithubRepo(ctx context.Context, file, githubInstance string) (string, error) {
-	goGitMu.Lock()
-	defer goGitMu.Unlock()
-
-	url, err := findGitRemoteURL(ctx, file, "origin")
+func FindGithubRepo(ctx context.Context, file string) (string, error) {
+	url, err := findGitRemoteURL(ctx, file)
 	if err != nil {
 		return "", err
 	}
-	_, slug := findGitSlug(url, githubInstance)
-	return slug, nil
+	return findGitSlug(url)
 }
 
-func findGitRemoteURL(_ context.Context, file, remoteName string) (string, error) {
-	repo, err := git.PlainOpenWithOptions(
-		file,
-		&git.PlainOpenOptions{
-			DetectDotGit:          true,
-			EnableDotGitCommonDir: true,
-		},
-	)
+func findGitRemoteURL(ctx context.Context, file string) (string, error) {
+	urls, err := gitOutput(ctx, file, "config", "--get-all", "remote.origin.url") // `remote get-url` applies insteadOf
 	if err != nil {
 		return "", err
 	}
-
-	remote, err := repo.Remote(remoteName)
-	if err != nil {
-		return "", err
+	if urls == "" {
+		return "", errors.New("remote 'origin' exists but has no URL")
 	}
-
-	if len(remote.Config().URLs) < 1 {
-		return "", fmt.Errorf("remote '%s' exists but has no URL", remoteName)
-	}
-
-	return remote.Config().URLs[0], nil
+	url, _, _ := strings.Cut(urls, "\n")
+	return url, nil
 }
 
-func findGitSlug(url, githubInstance string) (string, string) {
-	if matches := codeCommitHTTPRegex.FindStringSubmatch(url); matches != nil {
-		return "CodeCommit", matches[2]
-	} else if matches := codeCommitSSHRegex.FindStringSubmatch(url); matches != nil {
-		return "CodeCommit", matches[2]
-	} else if matches := githubHTTPRegex.FindStringSubmatch(url); matches != nil {
-		return "GitHub", fmt.Sprintf("%s/%s", matches[1], matches[2])
-	} else if matches := githubSSHRegex.FindStringSubmatch(url); matches != nil {
-		return "GitHub", fmt.Sprintf("%s/%s", matches[1], matches[2])
-	} else if githubInstance != "github.com" {
-		gheHTTPRegex := regexp.MustCompile(fmt.Sprintf(`^https?://%s/(.+)/(.+?)(?:.git)?$`, githubInstance))
-		gheSSHRegex := regexp.MustCompile(githubInstance + "[:/](.+)/(.+?)(?:.git)?$")
-		if matches := gheHTTPRegex.FindStringSubmatch(url); matches != nil {
-			return "GitHubEnterprise", fmt.Sprintf("%s/%s", matches[1], matches[2])
-		} else if matches := gheSSHRegex.FindStringSubmatch(url); matches != nil {
-			return "GitHubEnterprise", fmt.Sprintf("%s/%s", matches[1], matches[2])
-		}
+func findGitSlug(remoteURL string) (string, error) {
+	if matches := codeCommitHTTPRegex.FindStringSubmatch(remoteURL); matches != nil {
+		return matches[2], nil
+	} else if matches := codeCommitSSHRegex.FindStringSubmatch(remoteURL); matches != nil {
+		return matches[2], nil
 	}
-	return "", url
+	if host, repoPath, ok := strings.Cut(remoteURL, ":"); ok && filepath.VolumeName(remoteURL) == "" && !strings.Contains(host, "/") && !strings.HasPrefix(repoPath, "//") {
+		remoteURL = "ssh://" + host + "/" + repoPath // scp-like [user@]host:path
+	}
+	parsed, err := url.Parse(remoteURL)
+	if err != nil {
+		return "", errors.New("cannot parse the origin remote URL")
+	}
+	owner, repo := path.Split(strings.TrimSuffix(strings.Trim(parsed.Path, "/"), ".git"))
+	owner = path.Base(owner)
+	if parsed.Host == "" || repo == "" || owner == "." || owner == "/" {
+		return "", errors.New("cannot determine owner and repository from the origin remote URL")
+	}
+	return owner + "/" + repo, nil
 }
 
 // NewGitCloneExecutorInput the input for the NewGitCloneExecutor
@@ -255,277 +182,188 @@ type NewGitCloneExecutorInput struct {
 	// 0 for full clone.
 	Depth int
 
-	// Quiet drops the informational clone line to debug level, for callers that log their own
-	// download summary (the setup section's action report).
-	Quiet bool
-
 	// For Gitea
-	InsecureSkipTLS bool
+	InsecureSkipTLS               bool
+	ClientCertFile, ClientKeyFile string            // PEM, absolute as git runs in other directories
+	Transport                     http.RoundTripper // for FetchAction's archive downloads, nil for http.DefaultTransport
 }
 
-// CloneIfRequired returns the repository and a boolean indicating whether an existing local clone was reused.
-func CloneIfRequired(ctx context.Context, refName plumbing.ReferenceName, input NewGitCloneExecutorInput, logger log.FieldLogger) (*git.Repository, bool, error) {
-	r, err := git.PlainOpen(input.Dir)
+// CloneIfRequired reports whether an existing local clone was reused.
+func CloneIfRequired(ctx context.Context, input NewGitCloneExecutorInput, logger *logging.Logger) (bool, error) {
+	var origin string
+	_, err := os.Stat(filepath.Join(input.Dir, ".git")) // without it git would discover a repository around Dir
 	if err == nil {
-		// Verify the cached clone still points to the resolved URL before reusing it.
-		remote, err := r.Remote("origin")
-		if err == nil && len(remote.Config().URLs) > 0 && remote.Config().URLs[0] == input.URL {
-			// Reuse existing clone
-			return r, true, nil
-		}
-
-		switch {
-		case err != nil:
-			logger.Debugf("Removing cached clone at %s because origin cannot be read: %v", input.Dir, err)
-		case len(remote.Config().URLs) == 0:
-			logger.Debugf("Removing cached clone at %s because origin has no URL", input.Dir)
-		default:
-			logger.Debugf("Removing cached clone at %s because origin URL changed from %s to %s", input.Dir, remote.Config().URLs[0], input.URL)
-		}
-		if err := os.RemoveAll(input.Dir); err != nil {
-			return nil, false, fmt.Errorf("remove cached clone %s: %w", input.Dir, err)
-		}
+		origin, err = findGitRemoteURL(ctx, input.Dir)
 	}
-
-	var progressWriter io.Writer
-	if isatty.IsTerminal(os.Stdout.Fd()) || isatty.IsCygwinTerminal(os.Stdout.Fd()) {
-		if entry, ok := logger.(*log.Entry); ok {
-			progressWriter = entry.WriterLevel(log.DebugLevel)
-		} else if lgr, ok := logger.(*log.Logger); ok {
-			progressWriter = lgr.WriterLevel(log.DebugLevel)
-		} else {
-			log.Errorf("Unable to get writer from logger (type=%T)", logger)
-			progressWriter = os.Stdout
-		}
+	if err == nil && origin == input.URL {
+		return true, nil
 	}
-
-	cloneOptions := git.CloneOptions{
-		URL:      input.URL,
-		Progress: progressWriter,
-
-		InsecureSkipTLS: input.InsecureSkipTLS, // For Gitea
+	if ctxErr := ctx.Err(); ctxErr != nil { // a cancelled origin lookup must not discard a valid clone
+		return false, ctxErr
 	}
-	if input.Token != "" {
-		cloneOptions.Auth = &http.BasicAuth{
-			Username: "token",
-			Password: input.Token,
-		}
+	if err == nil {
+		logger.Debugf("Removing cached clone at %s because origin URL changed from %s to %s", input.Dir, origin, input.URL)
+	} else if _, statErr := os.Stat(input.Dir); statErr == nil {
+		logger.Debugf("Removing cached clone at %s because origin cannot be read: %v", input.Dir, err)
 	}
-
-	r, err = cloneAtDepth(ctx, input, cloneOptions, logger)
-	if err != nil {
-		logger.Errorf("Unable to clone %v %s: %v", input.URL, refName, err)
-		return nil, false, err
+	if err := os.RemoveAll(input.Dir); err != nil {
+		return false, fmt.Errorf("remove cached clone %s: %w", input.Dir, err)
 	}
-
-	if err = os.Chmod(input.Dir, 0o755); err != nil {
-		return nil, false, err
+	if err := clone(ctx, input); err != nil {
+		return false, err
 	}
-
-	return r, false, nil
-}
-
-func gitOptions(token string) (fetchOptions git.FetchOptions, pullOptions git.PullOptions) {
-	fetchOptions.RefSpecs = []config.RefSpec{"refs/*:refs/*", "HEAD:refs/heads/HEAD"}
-	fetchOptions.Force = true
-	pullOptions.Force = true
-
-	if token != "" {
-		auth := &http.BasicAuth{
-			Username: "token",
-			Password: token,
-		}
-		fetchOptions.Auth = auth
-		pullOptions.Auth = auth
+	if err := os.Chmod(input.Dir, 0o755); err != nil {
+		return false, err
 	}
-
-	return fetchOptions, pullOptions
-}
-
-// staleRefreshErr reports why a failed refresh must abort: the resolve and
-// checkout that follow are local and succeed on a cancelled context, which
-// would hand back the cached revision as if it were fresh.
-func staleRefreshErr(ctx context.Context, err error) error {
-	if err == nil || errors.Is(err, git.NoErrAlreadyUpToDate) {
-		return nil
-	}
-	return ctx.Err()
+	return false, nil
 }
 
 // NewGitCloneExecutor creates an executor to clone git repos
 func NewGitCloneExecutor(input NewGitCloneExecutorInput) common.Executor {
 	return func(ctx context.Context) error {
 		logger := common.Logger(ctx)
-		if input.Quiet {
-			logger.Debugf("git clone '%s' # ref=%s", input.URL, input.Ref)
-		} else {
-			logger.Infof("git clone '%s' # ref=%s", input.URL, input.Ref)
-		}
+		logger.Infof("git clone '%s' # ref=%s", input.URL, input.Ref)
 		logger.Debugf("  cloning %s to %s", input.URL, input.Dir)
-
-		defer AcquireCloneLock(input.Dir)()
-
-		refName := plumbing.ReferenceName("refs/heads/" + input.Ref)
-		r, reused, err := CloneIfRequired(ctx, refName, input, logger)
+		unlock, err := AcquireCloneLock(ctx, input.Dir)
 		if err != nil {
 			return err
 		}
+		defer unlock()
 
-		isOfflineMode := input.OfflineMode
-
-		// fetch latest changes
-		fetchOptions, pullOptions := gitOptions(input.Token)
-
-		if input.InsecureSkipTLS { // For Gitea
-			fetchOptions.InsecureSkipTLS = true
-			pullOptions.InsecureSkipTLS = true
-		}
-
-		// Action clones only ever need the tip commit, so keep a shallow cache cheap on update at depth 1 regardless of its original depth
-		// Turning action_shallow_clone off does not convert an existing shallow cache; evict it for a full clone.
-		shallow := isShallow(r)
-		if shallow {
-			fetchOptions.Depth = 1
-			if spec, ok := shallowFetchRefSpec(r, input.Ref); ok {
-				fetchOptions.RefSpecs = []config.RefSpec{spec}
-			}
-		}
-
-		// A just-cloned ref is as current as a fetch would make it, and a commit hash never moves.
-		_, _, present := refRevision(r, input.Ref)
-		refresh := !isOfflineMode && (!present || (reused && !plumbing.IsHash(input.Ref)))
-
-		if refresh {
-			err = r.FetchContext(ctx, &fetchOptions)
-			if err != nil && !errors.Is(err, git.NoErrAlreadyUpToDate) {
-				return err
-			}
-		}
-
-		var hash *plumbing.Hash
-		rev := plumbing.Revision(input.Ref)
-		if hash, err = r.ResolveRevision(rev); err != nil {
-			// ResolveRevision returns a nil hash on error, and a branch ref legitimately fails
-			// here (no local refs/heads/<ref>); the duck-typing below resolves it.
-			logger.Errorf("Unable to resolve %s: %v", input.Ref, err)
-		} else if hash.String() != input.Ref && strings.HasPrefix(hash.String(), input.Ref) {
-			return &Error{
-				err:    ErrShortRef,
-				commit: hash.String(),
-			}
-		}
-
-		rev, refType, _ := refRevision(r, input.Ref)
-
-		if hash, err = r.ResolveRevision(rev); err != nil {
-			logger.Errorf("Unable to resolve %s: %v", input.Ref, err)
+		resolved, reused, err := resolveClone(ctx, input)
+		if err != nil {
 			return err
 		}
-
-		var w *git.Worktree
-		if w, err = r.Worktree(); err != nil {
-			return err
+		if _, err := runGit(ctx, input.Dir, nil, "checkout", "--force", "--detach", resolved); err != nil {
+			return fmt.Errorf("checkout %s: %w", resolved, err)
 		}
-
-		// If the hash resolved doesn't match the ref provided in a workflow then we're
-		// using a branch or tag ref, not a sha
-		//
-		// Repos on disk point to commit hashes, and need to checkout input.Ref before
-		// we try and pull down any changes
-		if hash.String() != input.Ref && refType == "branch" {
-			logger.Debugf("Provided ref is not a sha. Checking out branch before pulling changes")
-			sourceRef := plumbing.ReferenceName(path.Join("refs", "remotes", "origin", input.Ref))
-			if err = w.Checkout(&git.CheckoutOptions{
-				Branch: sourceRef,
-				Force:  true,
-			}); err != nil {
-				logger.Errorf("Unable to checkout %s: %v", sourceRef, err)
-				return err
-			}
-		}
-
 		reusedMsg := ""
-
-		switch {
-		case refresh && !shallow:
-			// In shallow mode the depth-limited fetch above already advanced the ref.
-			if err = w.PullContext(ctx, &pullOptions); err != nil && !errors.Is(err, git.NoErrAlreadyUpToDate) {
-				logger.Debugf("Unable to pull %s: %v", refName, err)
-			}
-			if err := staleRefreshErr(ctx, err); err != nil {
-				return err
-			}
-		case isOfflineMode && reused:
+		if input.OfflineMode && reused {
 			reusedMsg = " (reused in offline mode)"
 		}
-
 		logger.Debugf("Cloned %s to %s%s", input.URL, input.Dir, reusedMsg)
-
-		if hash.String() != input.Ref && refType == "branch" {
-			logger.Debugf("Provided ref is not a sha. Updating branch ref after pull")
-			if hash, err = r.ResolveRevision(rev); err != nil {
-				logger.Errorf("Unable to resolve %s: %v", input.Ref, err)
-				return err
-			}
-		}
-		if err = w.Checkout(&git.CheckoutOptions{
-			Hash:  *hash,
-			Force: true,
-		}); err != nil {
-			logger.Errorf("Unable to checkout %s: %v", *hash, err)
-			return err
-		}
-
-		if err = w.Reset(&git.ResetOptions{
-			Mode:   git.HardReset,
-			Commit: *hash,
-		}); err != nil {
-			logger.Errorf("Unable to reset to %s: %v", hash.String(), err)
-			return err
-		}
-
 		logger.Debugf("Checked out %s", input.Ref)
 		return nil
 	}
 }
 
-// cloneAtDepth falls back to a full clone when the shallow attempt fails.
-func cloneAtDepth(ctx context.Context, input NewGitCloneExecutorInput, opts git.CloneOptions, logger log.FieldLogger) (*git.Repository, error) {
-	if input.Depth > 0 {
-		if plumbing.IsHash(input.Ref) {
-			r, err := fetchPinnedSHA(ctx, input, opts)
-			if err == nil {
-				return r, nil
-			}
-			logger.Debugf("Shallow fetch of %s at %s failed: %v", input.URL, input.Ref, err)
-			if err := removePartialClone(input.Dir); err != nil {
-				return nil, err
-			}
-		} else {
-			for _, refName := range []plumbing.ReferenceName{
-				plumbing.NewBranchReferenceName(input.Ref),
-				plumbing.NewTagReferenceName(input.Ref),
-			} {
-				shallowOpts := opts
-				shallowOpts.Depth = input.Depth
-				shallowOpts.SingleBranch = true
-				shallowOpts.ReferenceName = refName
-				shallowOpts.Tags = git.NoTags
+func resolveClone(ctx context.Context, input NewGitCloneExecutorInput) (string, bool, error) { // the caller holds input.Dir's lock
+	logger := common.Logger(ctx)
+	reused, err := CloneIfRequired(ctx, input, logger)
+	if err != nil {
+		return "", false, err
+	}
+	resolved, err := resolveRef(ctx, input.Dir, input.Ref)
+	if errors.Is(err, ErrShortRef) || (err != nil && input.OfflineMode) {
+		return "", false, err
+	}
+	if !input.OfflineMode && (err != nil || (reused && !isFullHash(input.Ref, resolved))) {
+		if err := fetch(ctx, input); err != nil {
+			return "", false, err
+		}
+		resolved, err = resolveRef(ctx, input.Dir, input.Ref)
+	}
+	if err != nil {
+		logger.Errorf("Unable to resolve %s: %v", input.Ref, err)
+	}
+	return resolved, reused, err
+}
 
-				r, err := git.PlainCloneContext(ctx, input.Dir, false, &shallowOpts)
-				if err == nil {
-					return r, nil
+func clone(ctx context.Context, input NewGitCloneExecutorInput) error {
+	if input.Depth > 0 && isFullObjectID(input.Ref) {
+		if err := shallowPinnedClone(ctx, input); err == nil {
+			return nil
+		} else if err := removePartialClone(input.Dir); err != nil {
+			return err
+		}
+	}
+	args := []string{"clone", "--no-checkout"}
+	if input.Depth > 0 {
+		args = append(args, "--no-local", "--depth", strconv.Itoa(input.Depth), "--no-tags")
+		if input.Ref != "HEAD" && !strings.HasPrefix(input.Ref, "refs/") {
+			args = append(args, "--branch", input.Ref)
+		}
+	}
+	args = append(args, input.URL, input.Dir)
+	if _, err := runGit(ctx, "", &input, args...); err == nil {
+		return nil
+	} else if input.Depth == 0 {
+		return err
+	}
+	if err := removePartialClone(input.Dir); err != nil {
+		return err
+	}
+	_, err := runGit(ctx, "", &input, "clone", "--no-checkout", input.URL, input.Dir)
+	return err
+}
+
+func shallowPinnedClone(ctx context.Context, input NewGitCloneExecutorInput) error {
+	if _, err := runGit(ctx, "", &input, "init", "--object-format="+ObjectFormat(input.Ref), input.Dir); err != nil {
+		return err
+	}
+	if _, err := runGit(ctx, input.Dir, &input, "remote", "add", "origin", input.URL); err != nil {
+		return err
+	}
+	_, err := runGit(ctx, input.Dir, &input, "fetch", "--depth", strconv.Itoa(input.Depth), "--no-tags", "origin", "+"+input.Ref+":refs/pinned/"+input.Ref)
+	return err
+}
+
+func fetch(ctx context.Context, input NewGitCloneExecutorInput) error {
+	args := []string{"fetch", "--force", "--no-prune"}
+	if _, err := os.Stat(filepath.Join(input.Dir, ".git", "shallow")); err == nil {
+		args = append(args, "--depth", "1", "--no-tags")
+	}
+	_, err := runGit(ctx, input.Dir, &input, append(args, "origin", "+"+input.Ref+":"+cachedRef(input.Ref))...) // git picks the remote ref, a tag before a branch
+	return err
+}
+
+func cachedRef(ref string) string {
+	return fmt.Sprintf("refs/runner/%x", sha256.Sum256([]byte(ref)))
+}
+
+func resolveRef(ctx context.Context, dir, ref string) (string, error) {
+	if !isFullObjectID(ref) {
+		revisions := []string{cachedRef(ref) + "^{commit}", "refs/tags/" + ref + "^{commit}", "refs/remotes/origin/" + ref + "^{commit}"}
+		if strings.ContainsAny(ref, "\x00\n") {
+			for _, revision := range revisions {
+				if sha, err := gitOutput(ctx, dir, "rev-parse", "--verify", revision); err == nil {
+					return sha, nil
 				}
-				logger.Debugf("Shallow clone of %s as %s failed: %v", input.URL, refName, err)
-				if err := removePartialClone(input.Dir); err != nil {
-					return nil, err
+			}
+		} else if output, err := runGitWithStdin(ctx, dir, nil, strings.NewReader(strings.Join(revisions, "\n")+"\n"), "cat-file", "--batch-check=%(objectname)"); err == nil {
+			for sha := range strings.SplitSeq(string(output), "\n") {
+				if isFullObjectID(sha) {
+					return sha, nil
 				}
 			}
 		}
-		logger.Debugf("Falling back to a full clone of %s for ref %q", input.URL, input.Ref)
 	}
+	sha, err := gitOutput(ctx, dir, "rev-parse", "--verify", ref+"^{commit}")
+	if err == nil && hexRefRegex.MatchString(ref) && len(sha) != len(ref) {
+		return "", &Error{err: ErrShortRef, commit: sha}
+	}
+	return sha, err
+}
 
-	return git.PlainCloneContext(ctx, input.Dir, false, &opts)
+func isFullObjectID(ref string) bool {
+	return ObjectFormat(ref) != ""
+}
+
+func isFullHash(ref, resolved string) bool {
+	return isFullObjectID(ref) && len(ref) == len(resolved)
+}
+
+// ObjectFormat returns the object format of a full commit hash, empty for anything else.
+func ObjectFormat(sha string) string {
+	switch {
+	case !hexRefRegex.MatchString(sha):
+		return ""
+	case len(sha) == 40:
+		return "sha1"
+	case len(sha) == 64:
+		return "sha256"
+	}
+	return ""
 }
 
 func removePartialClone(dir string) error {
@@ -535,71 +373,127 @@ func removePartialClone(dir string) error {
 	return nil
 }
 
-func fetchPinnedSHA(ctx context.Context, input NewGitCloneExecutorInput, opts git.CloneOptions) (*git.Repository, error) {
-	r, err := git.PlainInit(input.Dir, false)
+func gitOutput(ctx context.Context, dir string, args ...string) (string, error) {
+	output, err := runGit(ctx, dir, nil, args...)
+	return strings.TrimSpace(string(output)), err
+}
+
+func RemoteConfig(token string, insecureSkipTLS bool) []string {
+	var config []string
+	if insecureSkipTLS {
+		config = append(config, "http.sslVerify=false")
+	}
+	if token != "" {
+		config = append(config, "http.extraHeader=", "http.extraHeader=Authorization: Basic "+base64.StdEncoding.EncodeToString([]byte("token:"+token)))
+	}
+	return config
+}
+
+func ClientCertConfig(prefix, certFile, keyFile, executionOS string) []string {
+	if certFile == "" {
+		return nil
+	}
+	config := []string{prefix + "sslCert=" + certFile, prefix + "sslKey=" + keyFile}
+	if strings.EqualFold(executionOS, "windows") {
+		config = append(config, prefix+"sslBackend=openssl")
+	}
+	return config
+}
+
+// ConfigEnv applies `-c` style entries through the environment, keeping secrets out of argv.
+func ConfigEnv(config ...string) map[string]string {
+	env := map[string]string{"GIT_CONFIG_COUNT": strconv.Itoa(len(config))}
+	for i, entry := range config {
+		key, value, _ := strings.Cut(entry, "=")
+		env["GIT_CONFIG_KEY_"+strconv.Itoa(i)] = key
+		env["GIT_CONFIG_VALUE_"+strconv.Itoa(i)] = value
+	}
+	return env
+}
+
+func ListFiles(ctx context.Context, dir string) ([]string, error) {
+	listed, err := runGit(ctx, dir, nil, "ls-files", "-z", "-t", "--stage", "--others", "--exclude-standard")
 	if err != nil {
 		return nil, err
 	}
-	if _, err := r.CreateRemote(&config.RemoteConfig{Name: "origin", URLs: []string{input.URL}}); err != nil {
-		return nil, err
+	var files, repos []string
+	for entry := range strings.SplitSeq(string(listed), "\x00") {
+		tag, file, ok := strings.Cut(entry, " ")
+		if tag != "?" {
+			var meta string
+			meta, file, ok = strings.Cut(file, "\t")
+			if strings.HasPrefix(meta, "160000 ") {
+				file += "/"
+			}
+		}
+		if repo, isRepo := strings.CutSuffix(file, "/"); isRepo {
+			repos = append(repos, repo)
+		} else if ok {
+			files = append(files, file)
+		}
 	}
-	if err := r.FetchContext(ctx, &git.FetchOptions{
-		RefSpecs:        []config.RefSpec{pinnedRefSpec(input.Ref)},
-		Depth:           input.Depth,
-		Tags:            git.NoTags,
-		Auth:            opts.Auth,
-		Progress:        opts.Progress,
-		InsecureSkipTLS: opts.InsecureSkipTLS,
-	}); err != nil {
-		return nil, err
+	slices.Sort(repos)
+	for _, repo := range slices.Compact(repos) {
+		files = append(files, repo)
+		if _, err := os.Lstat(filepath.Join(dir, repo, ".git")); err != nil {
+			continue // git lists an uninitialized submodule as "./" from inside it
+		}
+		nested, err := ListFiles(ctx, filepath.Join(dir, repo))
+		if err != nil {
+			return nil, err
+		}
+		for _, file := range nested {
+			files = append(files, repo+"/"+file)
+		}
 	}
-	return r, nil
+	return files, nil
 }
 
-// pinnedRefSpec keeps a hash-shaped name out of refs/heads and refs/tags.
-func pinnedRefSpec(sha string) config.RefSpec {
-	return config.RefSpec(fmt.Sprintf("+%s:refs/pinned/%s", sha, sha))
+func runGit(ctx context.Context, dir string, input *NewGitCloneExecutorInput, args ...string) ([]byte, error) {
+	return runGitWithStdin(ctx, dir, input, nil, args...)
 }
 
-// refRevision picks the revision to check out and reports whether it resolves locally.
-func refRevision(r *git.Repository, ref string) (plumbing.Revision, string, bool) {
-	if plumbing.IsHash(ref) {
-		// git ignores a ref named as 40 hex digits, so a full hash always denotes the commit itself.
-		_, err := r.CommitObject(plumbing.NewHash(ref))
-		return plumbing.Revision(ref), "sha", err == nil
+func runGitWithStdin(ctx context.Context, dir string, input *NewGitCloneExecutorInput, stdin io.Reader, args ...string) ([]byte, error) {
+	config := []string{"core.autocrlf=false", "core.eol=lf"} // keep action files LF
+	if input != nil {
+		config = append(config, RemoteConfig(input.Token, input.InsecureSkipTLS)...)
+		config = append(config, ClientCertConfig("http.", input.ClientCertFile, input.ClientKeyFile, runtime.GOOS)...)
 	}
-	if _, err := r.Tag(ref); err == nil {
-		return plumbing.Revision(path.Join("refs", "tags", ref)), "tag", true
+	if dir != "" {
+		args = append([]string{"-C", dir}, args...)
 	}
-	remoteRef := plumbing.ReferenceName(path.Join("refs", "remotes", "origin", ref))
-	if _, err := r.Reference(remoteRef, false); err == nil {
-		return plumbing.Revision(remoteRef), "branch", true
+	cmd := exec.CommandContext(ctx, "git", args...)
+	cmd.Stdin = stdin
+	cmd.Env = slices.DeleteFunc(os.Environ(), func(entry string) bool {
+		name, _, _ := strings.Cut(entry, "=")
+		return slices.Contains(LocalEnvVars, name)
+	})
+	for key, value := range ConfigEnv(config...) {
+		cmd.Env = append(cmd.Env, key+"="+value)
 	}
-	rev := plumbing.Revision(ref)
-	_, err := r.ResolveRevision(rev)
-	return rev, "sha", err == nil
-}
-
-// isShallow reports whether the local repository was cloned with a limited depth.
-func isShallow(r *git.Repository) bool {
-	shallows, err := r.Storer.Shallow()
-	return err == nil && len(shallows) > 0
-}
-
-// shallowFetchRefSpec limits a shallow update to the requested ref, falling back to the broad refspec when it is not present locally.
-func shallowFetchRefSpec(r *git.Repository, ref string) (config.RefSpec, bool) {
-	tagRef := plumbing.NewTagReferenceName(ref)
-	if _, err := r.Reference(tagRef, false); err == nil {
-		return config.RefSpec(fmt.Sprintf("+%s:%s", tagRef, tagRef)), true
-	}
-	remoteRef := plumbing.NewRemoteReferenceName("origin", ref)
-	if _, err := r.Reference(remoteRef, false); err == nil {
-		branchRef := plumbing.NewBranchReferenceName(ref)
-		return config.RefSpec(fmt.Sprintf("+%s:%s", branchRef, remoteRef)), true
-	}
-	if plumbing.IsHash(ref) {
-		// The broad refspec carries only advertised tips, never a pinned commit.
-		return pinnedRefSpec(ref), true
-	}
-	return "", false
+	cmd.Env = append(cmd.Env, "GIT_TERMINAL_PROMPT=0")
+	var treeKill *process.TreeKill
+	if runtime.GOOS == "windows" {
+		treeKill = process.NewTreeKill(cmd) // a cancelled git leaves its remote helper holding the repository otherwise
+	} else {
+		cmd.Cancel = func() error { return cmd.Process.Signal(os.Interrupt) } // lets git remove its lock files
+	}
+	cmd.WaitDelay = time.Second
+	var stdout bytes.Buffer
+	var stderr strings.Builder
+	cmd.Stdout = &stdout
+	cmd.Stderr = &stderr
+	err := cmd.Start()
+	if err == nil {
+		if treeKill != nil {
+			if killer, captureErr := treeKill.Capture(cmd.Process); captureErr == nil {
+				defer killer.Close()
+			}
+		}
+		err = cmd.Wait()
+	}
+	if err != nil {
+		return stdout.Bytes(), fmt.Errorf("git %s: %w: %s", strings.Join(args, " "), err, strings.TrimSpace(stderr.String()))
+	}
+	return stdout.Bytes(), nil
 }

act/common/git/git_test.go

@@ -6,7 +6,7 @@ package git
 
 import (
 	"context"
-	"errors"
+	"encoding/base64"
 	"fmt"
 	"net/http"
 	"net/http/httptest"
@@ -16,48 +16,88 @@ import (
 	"strconv"
 	"strings"
 	"sync"
-	"sync/atomic"
 	"syscall"
 	"testing"
+	"testing/synctest"
 	"time"
 
-	"gitea.com/gitea/runner/act/common"
+	"gitea.com/gitea/runner/act/common/logging"
+	"gitea.com/gitea/runner/act/common/logging/logtest"
+	"gitea.com/gitea/runner/internal/pkg/lock"
 
-	gogit "github.com/go-git/go-git/v5"
-	gogitconfig "github.com/go-git/go-git/v5/config"
-	"github.com/go-git/go-git/v5/plumbing/transport"
-	gogitclient "github.com/go-git/go-git/v5/plumbing/transport/client"
-	gogitfile "github.com/go-git/go-git/v5/plumbing/transport/file"
-	log "github.com/sirupsen/logrus"
-	logrustest "github.com/sirupsen/logrus/hooks/test"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 )
 
-func TestFindGitSlug(t *testing.T) {
-	assert := assert.New(t)
+var gitFixtureDir string
 
-	slugTests := []struct {
-		url      string // input
-		provider string // expected result
-		slug     string // expected result
-	}{
-		{"https://git-codecommit.us-east-1.amazonaws.com/v1/repos/my-repo-name", "CodeCommit", "my-repo-name"},
-		{"ssh://git-codecommit.us-west-2.amazonaws.com/v1/repos/my-repo", "CodeCommit", "my-repo"},
-		{"git@github.com:nektos/act.git", "GitHub", "nektos/act"},
-		{"git@github.com:nektos/act", "GitHub", "nektos/act"},
-		{"https://github.com/nektos/act.git", "GitHub", "nektos/act"},
-		{"http://github.com/nektos/act.git", "GitHub", "nektos/act"},
-		{"https://github.com/nektos/act", "GitHub", "nektos/act"},
-		{"http://github.com/nektos/act", "GitHub", "nektos/act"},
-		{"git+ssh://git@github.com/owner/repo.git", "GitHub", "owner/repo"},
-		{"http://myotherrepo.com/act.git", "", "http://myotherrepo.com/act.git"},
+func TestMain(m *testing.M) {
+	var err error
+	gitFixtureDir, err = os.MkdirTemp("", "runner-git-fixture-")
+	if err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(1)
 	}
+	code := 1
+	if err = gitCmd("init", "--quiet", "--template=", "--bare", "--initial-branch=main", filepath.Join(gitFixtureDir, "remote")); err == nil {
+		err = gitCmd("init", "--quiet", "--template=", "--initial-branch=main", filepath.Join(gitFixtureDir, "work"))
+	}
+	if err == nil {
+		code = m.Run()
+	} else {
+		fmt.Fprintln(os.Stderr, err)
+	}
+	if err := os.RemoveAll(gitFixtureDir); err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		code = 1
+	}
+	os.Exit(code)
+}
 
-	for _, tt := range slugTests {
-		provider, slug := findGitSlug(tt.url, "github.com")
-		assert.Equal(tt.provider, provider)
-		assert.Equal(tt.slug, slug)
+func TestClientCertConfig(t *testing.T) {
+	for _, testcase := range []struct {
+		prefix, certFile, executionOS string
+		expected                      []string
+	}{
+		{"http.", "cert.pem", "windows", []string{"http.sslCert=cert.pem", "http.sslKey=key.pem", "http.sslBackend=openssl"}},
+		{"http.https://example.com/.", "cert.pem", "Windows", []string{"http.https://example.com/.sslCert=cert.pem", "http.https://example.com/.sslKey=key.pem", "http.https://example.com/.sslBackend=openssl"}},
+		{"http.", "cert.pem", "Linux", []string{"http.sslCert=cert.pem", "http.sslKey=key.pem"}},
+		{"http.", "", "Windows", nil},
+	} {
+		t.Run(testcase.prefix+testcase.certFile+testcase.executionOS, func(t *testing.T) {
+			assert.Equal(t, testcase.expected, ClientCertConfig(testcase.prefix, testcase.certFile, "key.pem", testcase.executionOS))
+		})
+	}
+}
+
+func TestFindGitSlug(t *testing.T) {
+	for _, testcase := range []struct {
+		remoteURL string
+		slug      string
+	}{
+		{"https://git-codecommit.us-east-1.amazonaws.com/v1/repos/my-repo-name", "my-repo-name"},
+		{"ssh://git-codecommit.us-west-2.amazonaws.com/v1/repos/my-repo", "my-repo"},
+		{"git@github.com:nektos/act.git", "nektos/act"},
+		{"git@github.com:nektos/act", "nektos/act"},
+		{"https://github.com/nektos/act.git", "nektos/act"},
+		{"http://github.com/nektos/act.git", "nektos/act"},
+		{"https://github.com/nektos/act", "nektos/act"},
+		{"http://github.com/nektos/act", "nektos/act"},
+		{"git+ssh://git@github.com/owner/repo.git", "owner/repo"},
+		{"https://example.com:3000/gitea/owner/repo.git/", "owner/repo"},
+		{"ssh://git@example.com:2222/gitea/owner/repo.git", "owner/repo"},
+		{"example.com:owner/repo.git", "owner/repo"},
+		{"http://myotherrepo.com/act.git", ""},
+		{"https://user:secret@example.com/act.git", ""},
+		{"/tmp/owner/repo.git", ""},
+		{"./owner/repo:branch", ""},
+	} {
+		t.Run(testcase.remoteURL, func(t *testing.T) {
+			slug, err := findGitSlug(testcase.remoteURL)
+			assert.Equal(t, testcase.slug == "", err != nil)
+			assert.NotContains(t, fmt.Sprint(err), "secret")
+			assert.Equal(t, testcase.slug, slug)
+		})
 	}
 }
 
@@ -68,144 +108,120 @@ func TestErrorWrapsCommitAndCause(t *testing.T) {
 	require.Equal(t, "abc123", err.Commit())
 }
 
-func cleanGitHooks(dir string) error {
-	hooksDir := filepath.Join(dir, ".git", "hooks")
-	files, err := os.ReadDir(hooksDir)
-	if err != nil {
-		if os.IsNotExist(err) {
-			return nil
-		}
-		return err
-	}
-	for _, f := range files {
-		if f.IsDir() {
-			continue
-		}
-		relName := filepath.Join(hooksDir, f.Name())
-		if err := os.Remove(relName); err != nil {
-			return err
-		}
-	}
-	return nil
-}
-
-func TestFindGithubRepoUsesOrigin(t *testing.T) {
+func TestFindGitMetadataOfSHA256RepositoryUsesOrigin(t *testing.T) {
+	t.Parallel()
 	basedir := t.TempDir()
 	const remoteURL = "https://github.com/owner/repo.git"
-	require.NoError(t, gitCmd("init", basedir))
-	require.NoError(t, cleanGitHooks(basedir))
+	require.NoError(t, gitCmd("init", "--object-format=sha256", "--initial-branch=main", basedir))
+	require.NoError(t, os.RemoveAll(filepath.Join(basedir, ".git", "hooks")))
+	require.NoError(t, gitCmd("-C", basedir, "commit", "--allow-empty", "-m", "init"))
 	require.NoError(t, gitCmd("-C", basedir, "remote", "add", "origin", remoteURL))
+	require.NoError(t, gitCmd("-C", basedir, "config", "--add", "remote.origin.url", "https://github.com/other/repo.git"))
 
-	url, err := findGitRemoteURL(context.Background(), basedir, "origin")
+	sha, err := FindGitRevision(t.Context(), basedir)
+	require.NoError(t, err)
+	require.Equal(t, gitRevParse(t, basedir, "HEAD"), sha)
+	require.Len(t, sha, 64)
+
+	ref, err := FindGitRef(t.Context(), basedir)
+	require.NoError(t, err)
+	require.Equal(t, "refs/heads/main", ref)
+
+	url, err := findGitRemoteURL(t.Context(), basedir)
 	require.NoError(t, err)
 	require.Equal(t, remoteURL, url)
 
-	slug, err := FindGithubRepo(context.Background(), basedir, "github.com")
+	slug, err := FindGithubRepo(t.Context(), basedir)
 	require.NoError(t, err)
 	require.Equal(t, "owner/repo", slug)
 }
 
 func TestGitFindRef(t *testing.T) {
+	t.Parallel()
 	basedir := t.TempDir()
 
 	for name, tt := range map[string]struct {
-		Prepare func(t *testing.T, dir string)
-		Assert  func(t *testing.T, ref string, err error)
+		commands [][]string
+		ref      string
 	}{
-		"new_repo": {
-			Prepare: func(t *testing.T, dir string) {},
-			Assert: func(t *testing.T, ref string, err error) {
-				require.Error(t, err)
-			},
-		},
+		"new_repo": {},
 		"new_repo_with_commit": {
-			Prepare: func(t *testing.T, dir string) {
-				require.NoError(t, gitCmd("-C", dir, "commit", "--allow-empty", "-m", "msg"))
-			},
-			Assert: func(t *testing.T, ref string, err error) {
-				require.NoError(t, err)
-				require.Equal(t, "refs/heads/master", ref)
-			},
+			commands: [][]string{{"commit", "--allow-empty", "-m", "msg"}},
+			ref:      "refs/heads/master",
 		},
 		"current_head_is_tag": {
-			Prepare: func(t *testing.T, dir string) {
-				require.NoError(t, gitCmd("-C", dir, "commit", "--allow-empty", "-m", "commit msg"))
-				require.NoError(t, gitCmd("-C", dir, "tag", "v1.2.3"))
-				require.NoError(t, gitCmd("-C", dir, "checkout", "v1.2.3"))
-			},
-			Assert: func(t *testing.T, ref string, err error) {
-				require.NoError(t, err)
-				require.Equal(t, "refs/tags/v1.2.3", ref)
+			commands: [][]string{
+				{"commit", "--allow-empty", "-m", "commit msg"},
+				{"tag", "v1.2.3"},
+				{"checkout", "v1.2.3"},
 			},
+			ref: "refs/tags/v1.2.3",
 		},
 		"current_head_is_same_as_tag": {
-			Prepare: func(t *testing.T, dir string) {
-				require.NoError(t, gitCmd("-C", dir, "commit", "--allow-empty", "-m", "1.4.2 release"))
-				require.NoError(t, gitCmd("-C", dir, "tag", "v1.4.2"))
-			},
-			Assert: func(t *testing.T, ref string, err error) {
-				require.NoError(t, err)
-				require.Equal(t, "refs/tags/v1.4.2", ref)
+			commands: [][]string{
+				{"commit", "--allow-empty", "-m", "1.4.2 release"},
+				{"tag", "v1.4.2"},
 			},
+			ref: "refs/tags/v1.4.2",
 		},
 		"current_head_is_not_tag": {
-			Prepare: func(t *testing.T, dir string) {
-				require.NoError(t, gitCmd("-C", dir, "commit", "--allow-empty", "-m", "msg"))
-				require.NoError(t, gitCmd("-C", dir, "tag", "v1.4.2"))
-				require.NoError(t, gitCmd("-C", dir, "commit", "--allow-empty", "-m", "msg2"))
-			},
-			Assert: func(t *testing.T, ref string, err error) {
-				require.NoError(t, err)
-				require.Equal(t, "refs/heads/master", ref)
+			commands: [][]string{
+				{"commit", "--allow-empty", "-m", "msg"},
+				{"tag", "v1.4.2"},
+				{"commit", "--allow-empty", "-m", "msg2"},
 			},
+			ref: "refs/heads/master",
 		},
 		"current_head_is_another_branch": {
-			Prepare: func(t *testing.T, dir string) {
-				require.NoError(t, gitCmd("-C", dir, "checkout", "-b", "mybranch"))
-				require.NoError(t, gitCmd("-C", dir, "commit", "--allow-empty", "-m", "msg"))
-			},
-			Assert: func(t *testing.T, ref string, err error) {
-				require.NoError(t, err)
-				require.Equal(t, "refs/heads/mybranch", ref)
+			commands: [][]string{
+				{"checkout", "-b", "mybranch"},
+				{"commit", "--allow-empty", "-m", "msg"},
 			},
+			ref: "refs/heads/mybranch",
 		},
 	} {
 		t.Run(name, func(t *testing.T) {
 			dir := filepath.Join(basedir, name)
-			require.NoError(t, os.MkdirAll(dir, 0o755))
-			require.NoError(t, gitCmd("-C", dir, "init", "--initial-branch=master"))
-			require.NoError(t, cleanGitHooks(dir))
-			tt.Prepare(t, dir)
-			ref, err := FindGitRef(context.Background(), dir)
-			tt.Assert(t, ref, err)
+			require.NoError(t, os.CopyFS(dir, os.DirFS(filepath.Join(gitFixtureDir, "work"))))
+			require.NoError(t, os.WriteFile(filepath.Join(dir, ".git", "HEAD"), []byte("ref: refs/heads/master\n"), 0o644))
+			for _, command := range tt.commands {
+				require.NoError(t, gitCmd(append([]string{"-C", dir}, command...)...))
+			}
+			ref, err := FindGitRef(t.Context(), dir)
+			if tt.ref == "" {
+				require.Error(t, err)
+			} else {
+				require.NoError(t, err)
+				require.Equal(t, tt.ref, ref)
+			}
 		})
 	}
 }
 
 func TestGitCloneExecutor(t *testing.T) {
-	// Build a local bare "remote" so this runs offline and fast. The cases below mirror
-	// the tag/branch/sha/short-sha ref paths the executor handles, formerly exercised by
-	// cloning actions/checkout and anchore/scan-action over the network.
-	remoteDir := t.TempDir()
-	require.NoError(t, gitCmd("init", "--bare", "--initial-branch=main", remoteDir))
-
-	workDir := t.TempDir()
-	require.NoError(t, gitCmd("clone", remoteDir, workDir))
-	require.NoError(t, gitCmd("-C", workDir, "checkout", "-b", "main"))
-	require.NoError(t, gitCmd("-C", workDir, "commit", "--allow-empty", "-m", "initial"))
+	remoteDir, workDir := newGitRemote(t)
+	require.NoError(t, os.WriteFile(filepath.Join(workDir, "action.sh"), []byte("#!/bin/sh\necho hi\n"), 0o755))
+	require.NoError(t, os.WriteFile(filepath.Join(workDir, ".gitattributes"), []byte("*.sh text\n"), 0o644))
+	require.NoError(t, gitCmd("-C", workDir, "add", "action.sh", ".gitattributes"))
+	require.NoError(t, gitCmd("-C", workDir, "commit", "-m", "initial"))
 	require.NoError(t, gitCmd("-C", workDir, "tag", "v2"))
 	require.NoError(t, gitCmd("-C", workDir, "push", "-u", "origin", "main"))
 	require.NoError(t, gitCmd("-C", workDir, "push", "origin", "v2"))
 
-	// A branch with a dash in the name (mirrors the historical scan-action@act-fails case).
 	require.NoError(t, gitCmd("-C", workDir, "checkout", "-b", "act-fails"))
 	require.NoError(t, gitCmd("-C", workDir, "commit", "--allow-empty", "-m", "branch-commit"))
 	require.NoError(t, gitCmd("-C", workDir, "push", "origin", "act-fails"))
 
-	out, err := exec.Command("git", "-C", workDir, "rev-parse", "main").Output()
-	require.NoError(t, err)
-	fullSha := strings.TrimSpace(string(out))
+	fullSha := gitRevParse(t, workDir, "main")
 
+	require.NoError(t, gitCmd("-C", workDir, "push", "origin", "main:refs/heads/"+fullSha[:4]))
+
+	hostConfig := filepath.Join(t.TempDir(), "gitconfig")
+	require.NoError(t, os.WriteFile(hostConfig, []byte("[core]\n\tautocrlf = true\n\teol = crlf\n[url "+strconv.Quote(remoteDir)+"]\n\tinsteadOf = https://example.invalid/action\n"), 0o644))
+	t.Setenv("GIT_CONFIG_GLOBAL", hostConfig)
+	t.Setenv("GIT_DIR", t.TempDir())
+
+	var clones sync.WaitGroup
 	for name, tt := range map[string]struct {
 		Err error
 		Ref string
@@ -226,34 +242,47 @@ func TestGitCloneExecutor(t *testing.T) {
 			Err: &Error{ErrShortRef, fullSha},
 			Ref: fullSha[:7],
 		},
+		"HEAD": {
+			Ref: "HEAD",
+		},
+		"hex branch named like its own commit": {
+			Ref: fullSha[:4],
+		},
 	} {
-		t.Run(name, func(t *testing.T) {
-			clone := NewGitCloneExecutor(NewGitCloneExecutorInput{
-				URL: remoteDir,
-				Ref: tt.Ref,
-				Dir: t.TempDir(),
-			})
+		clones.Go(func() {
+			t.Run(name, func(t *testing.T) {
+				dir := t.TempDir()
+				clone := NewGitCloneExecutor(NewGitCloneExecutorInput{
+					URL: "https://example.invalid/action",
+					Ref: tt.Ref,
+					Dir: dir,
+				})
 
-			err := clone(context.Background())
-			if tt.Err != nil {
-				assert.Error(t, err) //nolint:testifylint // pre-existing issue from nektos/act
-				assert.Equal(t, tt.Err, err)
-			} else {
-				assert.Empty(t, err) //nolint:testifylint // pre-existing issue from nektos/act
-			}
+				err := clone(t.Context())
+				if tt.Err != nil {
+					require.Error(t, err)
+					assert.Equal(t, tt.Err, err)
+					assert.Equal(t, tt.Err, clone(t.Context()), "a retry on the cache keeps the error")
+					return
+				}
+				require.NoError(t, err)
+				marker := filepath.Join(dir, "marker")
+				require.NoError(t, os.WriteFile(marker, nil, 0o644))
+				require.NoError(t, clone(t.Context()))
+				assert.FileExists(t, marker, "an insteadOf rewrite must not evict the cache")
+				script, err := os.ReadFile(filepath.Join(dir, "action.sh"))
+				require.NoError(t, err)
+				assert.Equal(t, "#!/bin/sh\necho hi\n", string(script), "host core.autocrlf must not convert action files")
+			})
 		})
 	}
+	clones.Wait()
 }
 
 func TestGitCloneExecutorReclonesWhenOriginURLChanges(t *testing.T) {
+	t.Parallel()
 	createRemote := func(message string) string {
-		remoteDir := t.TempDir()
-		require.NoError(t, gitCmd("init", "--bare", "--initial-branch=main", remoteDir))
-
-		workDir := t.TempDir()
-		require.NoError(t, gitCmd("clone", remoteDir, workDir))
-		require.NoError(t, gitCmd("-C", workDir, "checkout", "-b", "main"))
-		require.NoError(t, gitCmd("-C", workDir, "commit", "--allow-empty", "-m", message))
+		remoteDir, workDir := newGitRemote(t, message)
 		require.NoError(t, gitCmd("-C", workDir, "push", "-u", "origin", "main"))
 
 		return remoteDir
@@ -269,16 +298,27 @@ func TestGitCloneExecutorReclonesWhenOriginURLChanges(t *testing.T) {
 		Dir: cacheDir,
 	})(t.Context()))
 
+	nested := filepath.Join(cacheDir, "nested")
+	require.NoError(t, os.Mkdir(nested, 0o755))
+	require.NoError(t, NewGitCloneExecutor(NewGitCloneExecutorInput{URL: oldRemoteDir, Ref: "main", Dir: nested})(t.Context()))
+	assert.DirExists(t, filepath.Join(nested, ".git"), "an empty cache dir inside a clone of the same URL gets its own repository")
+
 	markerPath := filepath.Join(cacheDir, "stale-marker")
 	require.NoError(t, os.WriteFile(markerPath, []byte("stale"), 0o644))
 
+	cancelled, cancel := context.WithCancel(t.Context())
+	cancel()
+	_, err := CloneIfRequired(cancelled, NewGitCloneExecutorInput{URL: oldRemoteDir, Ref: "main", Dir: cacheDir}, logging.New(logtest.New()))
+	require.ErrorIs(t, err, context.Canceled)
+	require.FileExists(t, markerPath)
+
 	require.NoError(t, NewGitCloneExecutor(NewGitCloneExecutorInput{
 		URL: newRemoteDir,
 		Ref: "main",
 		Dir: cacheDir,
 	})(t.Context()))
 
-	originURL, err := findGitRemoteURL(t.Context(), cacheDir, "origin")
+	originURL, err := findGitRemoteURL(t.Context(), cacheDir)
 	require.NoError(t, err)
 	assert.Equal(t, newRemoteDir, originURL)
 
@@ -290,87 +330,58 @@ func TestGitCloneExecutorReclonesWhenOriginURLChanges(t *testing.T) {
 	require.True(t, os.IsNotExist(err), "stale cached directory should be removed before recloning")
 }
 
-func TestGitCloneExecutorNonFastForwardRef(t *testing.T) {
-	// Simulate the scenario where a remote ref (e.g. a GitHub PR head ref) changes
-	// non-fast-forward between two fetches. Before the fix, the fetch used Force=false,
-	// causing go-git to return ErrForceNeeded and short-circuit the checkout.
-
-	// Create a bare "remote" repo with an initial commit on main and a feature branch.
-	remoteDir := t.TempDir()
-	require.NoError(t, gitCmd("init", "--bare", "--initial-branch=main", remoteDir))
-
-	// We need a working clone to push commits from.
-	workDir := t.TempDir()
-	require.NoError(t, gitCmd("clone", remoteDir, workDir))
-	require.NoError(t, gitCmd("-C", workDir, "checkout", "-b", "main"))
-	require.NoError(t, gitCmd("-C", workDir, "commit", "--allow-empty", "-m", "initial"))
+func TestGitCloneExecutorFollowsRemoteRefChanges(t *testing.T) {
+	t.Parallel()
+	remoteDir, workDir := newGitRemote(t, "initial", "feature-1")
 	require.NoError(t, gitCmd("-C", workDir, "push", "-u", "origin", "main"))
 
-	// Create a feature branch (simulates refs/pull/N/head).
-	require.NoError(t, gitCmd("-C", workDir, "checkout", "-b", "feature"))
-	require.NoError(t, gitCmd("-C", workDir, "commit", "--allow-empty", "-m", "feature-1"))
-	require.NoError(t, gitCmd("-C", workDir, "push", "origin", "feature"))
+	dir := t.TempDir()
+	clone := NewGitCloneExecutor(NewGitCloneExecutorInput{URL: remoteDir, Ref: "main", Dir: dir})
+	require.NoError(t, clone(t.Context()))
+	require.NoError(t, gitCmd("-C", dir, "config", "fetch.prune", "true"))
+	require.NoError(t, clone(t.Context()))
 
-	// First clone via the executor — should succeed and cache the repo.
-	cloneDir := t.TempDir()
-	clone := NewGitCloneExecutor(NewGitCloneExecutorInput{
-		URL: remoteDir,
-		Ref: "main",
-		Dir: cloneDir,
-	})
-	require.NoError(t, clone(context.Background()))
-
-	// Now force-push the feature branch to a non-fast-forward commit (simulates
-	// a PR rebase). This makes refs/heads/feature non-fast-forward.
-	require.NoError(t, gitCmd("-C", workDir, "checkout", "main"))
-	require.NoError(t, gitCmd("-C", workDir, "branch", "-D", "feature"))
-	require.NoError(t, gitCmd("-C", workDir, "checkout", "-b", "feature"))
+	require.NoError(t, gitCmd("-C", workDir, "reset", "--hard", "HEAD~1"))
 	require.NoError(t, gitCmd("-C", workDir, "commit", "--allow-empty", "-m", "feature-rewritten"))
-	require.NoError(t, gitCmd("-C", workDir, "push", "--force", "origin", "feature"))
+	require.NoError(t, gitCmd("-C", workDir, "push", "--force", "origin", "main"))
+	require.NoError(t, clone(t.Context()), "a non-fast-forward ref must update")
+	assert.Equal(t, "feature-rewritten", gitHeadSubject(t, dir))
 
-	// Also advance main so we can verify the clone picks up the new commit.
-	require.NoError(t, gitCmd("-C", workDir, "checkout", "main"))
-	require.NoError(t, gitCmd("-C", workDir, "commit", "--allow-empty", "-m", "second"))
-	require.NoError(t, gitCmd("-C", workDir, "push", "origin", "main"))
+	tagDir := t.TempDir()
+	tagClone := NewGitCloneExecutor(NewGitCloneExecutorInput{URL: remoteDir, Ref: "v9", Dir: tagDir})
+	require.Error(t, tagClone(t.Context()))
+	require.NoError(t, gitCmd("-C", workDir, "tag", "v9"))
+	require.NoError(t, gitCmd("-C", workDir, "push", "origin", "v9"))
+	require.NoError(t, tagClone(t.Context()), "a tag published after a failed lookup must be fetched")
 
-	// Second clone to the same directory — before the fix this returned ErrForceNeeded
-	// and left the working tree at the old commit.
-	err := clone(context.Background())
-	require.NoError(t, err, "fetch with non-fast-forward refs must not fail when Force=true")
-
-	// Verify the working tree was actually updated to the latest main commit.
-	out, err := exec.Command("git", "-C", cloneDir, "log", "--oneline", "-1", "--format=%s").Output()
-	require.NoError(t, err)
-	assert.Equal(t, "second", strings.TrimSpace(string(out)), "working tree should be at the latest commit")
+	require.NoError(t, gitCmd("-C", workDir, "commit", "--allow-empty", "-m", "tag-moved"))
+	require.NoError(t, gitCmd("-C", workDir, "tag", "--force", "v9"))
+	require.NoError(t, gitCmd("-C", workDir, "push", "--force", "origin", "v9"))
+	for range 2 {
+		require.NoError(t, tagClone(t.Context()), "a moved tag must update and stay current")
+		assert.Equal(t, "tag-moved", gitHeadSubject(t, tagDir))
+	}
 }
 
 func TestGitCloneExecutorOfflineMode(t *testing.T) {
-	// Build a local "remote" with a single commit on main.
-	remoteDir := t.TempDir()
-	require.NoError(t, gitCmd("init", "--bare", "--initial-branch=main", remoteDir))
-	workDir := t.TempDir()
-	require.NoError(t, gitCmd("clone", remoteDir, workDir))
-	require.NoError(t, gitCmd("-C", workDir, "checkout", "-b", "main"))
-	require.NoError(t, gitCmd("-C", workDir, "commit", "--allow-empty", "-m", "initial"))
+	t.Parallel()
+	remoteDir, workDir := newGitRemote(t, "initial")
 	require.NoError(t, gitCmd("-C", workDir, "push", "-u", "origin", "main"))
 
-	// Prime the cache with an online clone of main.
 	cacheDir := t.TempDir()
 	require.NoError(t, NewGitCloneExecutor(NewGitCloneExecutorInput{
 		URL: remoteDir,
 		Ref: "main",
 		Dir: cacheDir,
-	})(context.Background()))
+	})(t.Context()))
 
 	t.Run("cached branch resolves without fetching", func(t *testing.T) {
-		// Offline reuse of a cached branch must succeed even though ResolveRevision(input.Ref)
-		// finds no local refs/heads/<ref>.
 		err := NewGitCloneExecutor(NewGitCloneExecutorInput{
 			URL:         remoteDir,
 			Ref:         "main",
 			Dir:         cacheDir,
 			OfflineMode: true,
-		})(context.Background())
+		})(t.Context())
 		require.NoError(t, err)
 
 		out, err := exec.Command("git", "-C", cacheDir, "log", "--oneline", "-1", "--format=%s").Output()
@@ -379,65 +390,19 @@ func TestGitCloneExecutorOfflineMode(t *testing.T) {
 	})
 
 	t.Run("unresolvable cached ref returns error", func(t *testing.T) {
-		// The ref was never cached; offline mode cannot resolve it and must return an error.
 		err := NewGitCloneExecutor(NewGitCloneExecutorInput{
 			URL:         remoteDir,
 			Ref:         "never-fetched",
 			Dir:         cacheDir,
 			OfflineMode: true,
-		})(context.Background())
+		})(t.Context())
 		require.Error(t, err)
 	})
 }
 
-func TestGitCloneExecutorQuietDemotesCloneLine(t *testing.T) {
-	remoteDir := t.TempDir()
-	require.NoError(t, gitCmd("init", "--bare", "--initial-branch=main", remoteDir))
-	workDir := t.TempDir()
-	require.NoError(t, gitCmd("clone", remoteDir, workDir))
-	require.NoError(t, gitCmd("-C", workDir, "checkout", "-b", "main"))
-	require.NoError(t, gitCmd("-C", workDir, "commit", "--allow-empty", "-m", "initial"))
-	require.NoError(t, gitCmd("-C", workDir, "push", "-u", "origin", "main"))
-
-	// Quiet callers report the download themselves, so the clone line must not reach the job log.
-	for name, quiet := range map[string]bool{"quiet": true, "not quiet": false} {
-		t.Run(name, func(t *testing.T) {
-			logger, hook := logrustest.NewNullLogger()
-			logger.SetLevel(log.InfoLevel)
-			ctx := common.WithLogger(context.Background(), logger.WithField("job", "j1"))
-
-			require.NoError(t, NewGitCloneExecutor(NewGitCloneExecutorInput{
-				URL:   remoteDir,
-				Ref:   "main",
-				Dir:   t.TempDir(),
-				Quiet: quiet,
-			})(ctx))
-
-			var cloneLines int
-			for _, entry := range hook.AllEntries() {
-				if strings.HasPrefix(entry.Message, "git clone ") {
-					cloneLines++
-				}
-			}
-			if quiet {
-				assert.Zero(t, cloneLines)
-			} else {
-				assert.Equal(t, 1, cloneLines)
-			}
-		})
-	}
-}
-
 func TestGitCloneExecutorShallow(t *testing.T) {
-	// Build a local "remote" with several commits on main plus a tag, so a full clone would pull noticeably more history than a shallow one.
-	remoteDir := t.TempDir()
-	require.NoError(t, gitCmd("init", "--bare", "--initial-branch=main", remoteDir))
-	workDir := t.TempDir()
-	require.NoError(t, gitCmd("clone", remoteDir, workDir))
-	require.NoError(t, gitCmd("-C", workDir, "checkout", "-b", "main"))
-	for _, m := range []string{"c1", "c2", "c3"} {
-		require.NoError(t, gitCmd("-C", workDir, "commit", "--allow-empty", "-m", m))
-	}
+	t.Parallel()
+	remoteDir, workDir := newGitRemote(t, "c1", "c2", "c3")
 	require.NoError(t, gitCmd("-C", workDir, "tag", "v1"))
 	unadvertisedSHA := gitRevParse(t, workDir, "HEAD~1")
 	require.NoError(t, gitCmd("-C", workDir, "push", "-u", "origin", "main"))
@@ -445,25 +410,17 @@ func TestGitCloneExecutorShallow(t *testing.T) {
 
 	shallowMarker := func(dir string) string { return filepath.Join(dir, ".git", "shallow") }
 
-	t.Run("branch is cloned shallowly", func(t *testing.T) {
-		dir := t.TempDir()
-		require.NoError(t, NewGitCloneExecutor(NewGitCloneExecutorInput{
-			URL: remoteDir, Ref: "main", Dir: dir, Depth: 1,
-		})(t.Context()))
-		assert.FileExists(t, shallowMarker(dir), "clone should be shallow")
-		assert.Equal(t, 1, gitRevCount(t, dir), "only the tip commit should be present")
-		assert.Equal(t, "c3", gitHeadSubject(t, dir))
-	})
-
-	t.Run("tag is cloned shallowly", func(t *testing.T) {
-		dir := t.TempDir()
-		require.NoError(t, NewGitCloneExecutor(NewGitCloneExecutorInput{
-			URL: remoteDir, Ref: "v1", Dir: dir, Depth: 1,
-		})(t.Context()))
-		assert.FileExists(t, shallowMarker(dir), "clone should be shallow")
-		assert.Equal(t, 1, gitRevCount(t, dir))
-		assert.Equal(t, "c3", gitHeadSubject(t, dir))
-	})
+	for name, ref := range map[string]string{"branch is cloned shallowly": "main", "tag is cloned shallowly": "v1"} {
+		t.Run(name, func(t *testing.T) {
+			dir := t.TempDir()
+			require.NoError(t, NewGitCloneExecutor(NewGitCloneExecutorInput{
+				URL: remoteDir, Ref: ref, Dir: dir, Depth: 1,
+			})(t.Context()))
+			assert.FileExists(t, shallowMarker(dir), "clone should be shallow")
+			assert.Equal(t, 1, gitRevCount(t, dir), "only the tip commit should be present")
+			assert.Equal(t, "c3", gitHeadSubject(t, dir))
+		})
+	}
 
 	unadvertisedRemote := func(t *testing.T, allowUnadvertised bool) string {
 		remote := filepath.Join(t.TempDir(), "remote.git")
@@ -472,12 +429,11 @@ func TestGitCloneExecutorShallow(t *testing.T) {
 		return remote
 	}
 
-	t.Run("commit hash falls back to a full clone when the remote refuses unadvertised objects", func(t *testing.T) {
+	t.Run("commit hash resolves when the remote accepts a direct shallow fetch", func(t *testing.T) {
 		dir := t.TempDir()
 		require.NoError(t, NewGitCloneExecutor(NewGitCloneExecutorInput{
 			URL: unadvertisedRemote(t, false), Ref: unadvertisedSHA, Dir: dir, Depth: 1,
 		})(t.Context()))
-		assert.NoFileExists(t, shallowMarker(dir))
 		assert.Equal(t, unadvertisedSHA, gitRevParse(t, dir, "HEAD"))
 	})
 
@@ -504,61 +460,47 @@ func TestGitCloneExecutorShallow(t *testing.T) {
 		assert.Equal(t, olderSHA, gitRevParse(t, dir, "HEAD"))
 	})
 
-	t.Run("moving branch updates while staying shallow", func(t *testing.T) {
+	t.Run("moving hexadecimal-named branch updates while staying shallow", func(t *testing.T) {
+		require.NoError(t, gitCmd("-C", workDir, "push", "origin", "main:deadbeef"))
 		dir := t.TempDir()
-		require.NoError(t, NewGitCloneExecutor(NewGitCloneExecutorInput{
-			URL: remoteDir, Ref: "main", Dir: dir, Depth: 1,
-		})(t.Context()))
+		clone := NewGitCloneExecutor(NewGitCloneExecutorInput{
+			URL: remoteDir, Ref: "deadbeef", Dir: dir, Depth: 1,
+		})
+		require.NoError(t, clone(t.Context()))
 		require.Equal(t, "c3", gitHeadSubject(t, dir))
 
-		// Advance main on the remote, then reuse the existing shallow clone.
 		require.NoError(t, gitCmd("-C", workDir, "commit", "--allow-empty", "-m", "c4"))
-		require.NoError(t, gitCmd("-C", workDir, "push", "origin", "main"))
+		require.NoError(t, gitCmd("-C", workDir, "push", "origin", "main:deadbeef"))
 
-		require.NoError(t, NewGitCloneExecutor(NewGitCloneExecutorInput{
-			URL: remoteDir, Ref: "main", Dir: dir, Depth: 1,
-		})(t.Context()))
+		require.NoError(t, clone(t.Context()))
 		assert.Equal(t, "c4", gitHeadSubject(t, dir), "reused shallow clone should update to the new tip")
 		assert.FileExists(t, shallowMarker(dir), "repo should remain shallow after update")
 		assert.Equal(t, 1, gitRevCount(t, dir))
 	})
-}
 
-func TestGitCloneExecutorColdCloneSkipsRefresh(t *testing.T) {
-	remoteDir := t.TempDir()
-	require.NoError(t, gitCmd("init", "--bare", "--initial-branch=main", remoteDir))
-	workDir := t.TempDir()
-	require.NoError(t, gitCmd("clone", remoteDir, workDir))
-	require.NoError(t, gitCmd("-C", workDir, "checkout", "-b", "main"))
-	require.NoError(t, gitCmd("-C", workDir, "commit", "--allow-empty", "-m", "c1"))
-	require.NoError(t, gitCmd("-C", workDir, "tag", "v1"))
-	require.NoError(t, gitCmd("-C", workDir, "push", "-u", "origin", "main"))
-	require.NoError(t, gitCmd("-C", workDir, "push", "origin", "v1"))
-
-	for name, tt := range map[string]struct {
-		Ref   string
-		Depth int
-	}{
-		"shallow branch": {"main", 1},
-		"full clone tag": {"v1", 0},
-	} {
-		t.Run(name, func(t *testing.T) {
-			counter := installCountingTransport(t)
-			require.NoError(t, NewGitCloneExecutor(NewGitCloneExecutorInput{
-				URL: remoteDir, Ref: tt.Ref, Dir: t.TempDir(), Depth: tt.Depth,
-			})(t.Context()))
-			assert.Equal(t, int64(1), counter.sessions.Load())
-		})
-	}
+	t.Run("sha256 full hash is cloned shallowly, reused without the remote, and its 40-character prefix is short", func(t *testing.T) {
+		remote := filepath.Join(t.TempDir(), "remote.git")
+		require.NoError(t, gitCmd("init", "--bare", "--object-format=sha256", "--initial-branch=main", remote))
+		work := t.TempDir()
+		require.NoError(t, gitCmd("init", "--object-format=sha256", "--initial-branch=main", work))
+		require.NoError(t, gitCmd("-C", work, "remote", "add", "origin", remote))
+		require.NoError(t, gitCmd("-C", work, "commit", "--allow-empty", "-m", "pinned"))
+		require.NoError(t, gitCmd("-C", work, "push", "origin", "main"))
+		sha := gitRevParse(t, work, "HEAD")
+		dir := t.TempDir()
+		clone := NewGitCloneExecutor(NewGitCloneExecutorInput{URL: remote, Ref: sha, Dir: dir, Depth: 1})
+		require.NoError(t, clone(t.Context()))
+		assert.FileExists(t, shallowMarker(dir))
+		require.ErrorIs(t, NewGitCloneExecutor(NewGitCloneExecutorInput{URL: remote, Ref: sha[:40], Dir: dir, Depth: 1, OfflineMode: true})(t.Context()), ErrShortRef)
+		require.NoError(t, os.RemoveAll(remote))
+		require.NoError(t, clone(t.Context()))
+		assert.Equal(t, sha, gitRevParse(t, dir, "HEAD"))
+	})
 }
 
 func TestGitCloneExecutorPinnedHashIgnoresShadowingRef(t *testing.T) {
-	remoteDir := t.TempDir()
-	require.NoError(t, gitCmd("init", "--bare", "--initial-branch=main", remoteDir))
-	workDir := t.TempDir()
-	require.NoError(t, gitCmd("clone", remoteDir, workDir))
-	require.NoError(t, gitCmd("-C", workDir, "checkout", "-b", "main"))
-	require.NoError(t, gitCmd("-C", workDir, "commit", "--allow-empty", "-m", "pinned"))
+	t.Parallel()
+	remoteDir, workDir := newGitRemote(t, "pinned")
 	pinned := gitRevParse(t, workDir, "HEAD")
 	require.NoError(t, gitCmd("-C", workDir, "commit", "--allow-empty", "-m", "decoy"))
 	require.NoError(t, gitCmd("-C", workDir, "tag", pinned))
@@ -576,23 +518,19 @@ func TestGitCloneExecutorPinnedHashIgnoresShadowingRef(t *testing.T) {
 	}
 }
 
-type countingTransport struct {
-	transport.Transport
-	sessions atomic.Int64
-}
-
-func (c *countingTransport) NewUploadPackSession(ep *transport.Endpoint, auth transport.AuthMethod) (transport.UploadPackSession, error) {
-	c.sessions.Add(1)
-	return c.Transport.NewUploadPackSession(ep, auth)
-}
-
-func installCountingTransport(t *testing.T) *countingTransport {
+func newGitRemote(t *testing.T, messages ...string) (string, string) {
 	t.Helper()
-	counter := &countingTransport{Transport: gogitfile.DefaultClient}
-	gogitclient.InstallProtocol("file", counter)
-	t.Cleanup(func() { gogitclient.InstallProtocol("file", gogitfile.DefaultClient) })
-
-	return counter
+	remoteDir, workDir := t.TempDir(), t.TempDir()
+	require.NoError(t, os.CopyFS(remoteDir, os.DirFS(filepath.Join(gitFixtureDir, "remote"))))
+	require.NoError(t, os.CopyFS(workDir, os.DirFS(filepath.Join(gitFixtureDir, "work"))))
+	config, err := os.ReadFile(filepath.Join(workDir, ".git", "config"))
+	require.NoError(t, err)
+	require.NoError(t, os.WriteFile(filepath.Join(workDir, ".git", "config"),
+		fmt.Appendf(config, "\n[remote \"origin\"]\n\turl = %s\n\tfetch = +refs/heads/*:refs/remotes/origin/*\n", strconv.Quote(remoteDir)), 0o644))
+	for _, message := range messages {
+		require.NoError(t, gitCmd("-C", workDir, "commit", "--allow-empty", "-m", message))
+	}
+	return remoteDir, workDir
 }
 
 func gitRevParse(t *testing.T, dir, rev string) string {
@@ -622,9 +560,6 @@ func gitCmd(args ...string) error {
 	cmd := exec.Command("git", args...)
 	cmd.Stdout = os.Stdout
 	cmd.Stderr = os.Stderr
-	// Inject a deterministic identity and ignore the host's global/system config so commits
-	// succeed regardless of the host having no user.name/user.email (e.g. CI, GITHUB_ACTIONS
-	// unset) or a global commit.gpgsign, and without mutating the developer's ~/.gitconfig.
 	cmd.Env = append(os.Environ(),
 		"GIT_AUTHOR_NAME=Unit Test",
 		"GIT_AUTHOR_EMAIL=test@test.com",
@@ -645,14 +580,42 @@ func gitCmd(args ...string) error {
 }
 
 func TestAcquireCloneLock(t *testing.T) {
+	t.Run("blocks on a lock held by another process despite a trailing separator", func(t *testing.T) {
+		dir := filepath.Join(t.TempDir(), "cache")
+		release, err := lock.TryLock(dir)
+		require.NoError(t, err)
+		defer func() { require.NoError(t, release()) }()
+		synctest.Test(t, func(t *testing.T) {
+			ctx, cancel := context.WithTimeout(t.Context(), time.Second)
+			defer cancel()
+			_, err := AcquireCloneLock(ctx, dir+string(filepath.Separator))
+			require.ErrorIs(t, err, context.DeadlineExceeded)
+		})
+	})
+
+	t.Run("read-only parent falls back to an in-process lock", func(t *testing.T) {
+		parent := t.TempDir()
+		dir := filepath.Join(parent, "cache")
+		require.NoError(t, os.Mkdir(dir, 0o755))
+		require.NoError(t, os.Chmod(parent, 0o555))
+		defer func() { require.NoError(t, os.Chmod(parent, 0o755)) }()
+		unlock, err := AcquireCloneLock(t.Context(), dir)
+		require.NoError(t, err)
+		unlock()
+	})
+
 	t.Run("same directory serializes", func(t *testing.T) {
 		dir := t.TempDir()
 
-		unlock1 := AcquireCloneLock(dir)
+		unlock1, err := AcquireCloneLock(t.Context(), dir)
+		require.NoError(t, err)
 
 		secondAcquired := make(chan struct{})
 		go func() {
-			unlock := AcquireCloneLock(dir)
+			unlock, err := AcquireCloneLock(t.Context(), dir)
+			if !assert.NoError(t, err) {
+				return
+			}
 			close(secondAcquired)
 			unlock()
 		}()
@@ -676,12 +639,16 @@ func TestAcquireCloneLock(t *testing.T) {
 		dirA := t.TempDir()
 		dirB := t.TempDir()
 
-		unlockA := AcquireCloneLock(dirA)
+		unlockA, err := AcquireCloneLock(t.Context(), dirA)
+		require.NoError(t, err)
 		defer unlockA()
 
 		done := make(chan struct{})
 		go func() {
-			unlock := AcquireCloneLock(dirB)
+			unlock, err := AcquireCloneLock(t.Context(), dirB)
+			if !assert.NoError(t, err) {
+				return
+			}
 			unlock()
 			close(done)
 		}()
@@ -694,13 +661,17 @@ func TestAcquireCloneLock(t *testing.T) {
 	})
 }
 
-// An unresponsive remote must not pin a job: the refresh has to be interruptible.
-func TestNewGitCloneExecutorFetchHonoursContext(t *testing.T) {
+func TestNewGitCloneExecutorFetchSendsTokenAndHonoursContext(t *testing.T) {
+	t.Parallel()
 	block := make(chan struct{})
 	reached := make(chan struct{})
 	var once sync.Once
-	server := httptest.NewServer(http.HandlerFunc(func(_ http.ResponseWriter, _ *http.Request) {
-		once.Do(func() { close(reached) })
+	var authorization string
+	server := httptest.NewServer(http.HandlerFunc(func(_ http.ResponseWriter, request *http.Request) {
+		once.Do(func() {
+			authorization = request.Header.Get("Authorization")
+			close(reached)
+		})
 		<-block
 	}))
 	t.Cleanup(func() {
@@ -709,24 +680,23 @@ func TestNewGitCloneExecutorFetchHonoursContext(t *testing.T) {
 	})
 
 	dir := filepath.Join(t.TempDir(), "cached-action")
-	repo, err := gogit.PlainInit(dir, false)
-	require.NoError(t, err)
-	_, err = repo.CreateRemote(&gogitconfig.RemoteConfig{Name: "origin", URLs: []string{server.URL}})
-	require.NoError(t, err)
+	require.NoError(t, gitCmd("init", dir))
+	require.NoError(t, gitCmd("-C", dir, "remote", "add", "origin", server.URL))
 
 	ctx, cancel := context.WithCancel(t.Context())
 	defer cancel()
 
 	done := make(chan error, 1)
 	go func() {
-		done <- NewGitCloneExecutor(NewGitCloneExecutorInput{URL: server.URL, Ref: "main", Dir: dir})(ctx)
+		done <- NewGitCloneExecutor(NewGitCloneExecutorInput{URL: server.URL, Ref: "main", Dir: dir, Token: "secret"})(ctx)
 	}()
 
 	select {
 	case <-reached:
-	case <-time.After(10 * time.Second):
-		t.Fatal("the executor never reached the remote")
+	case err := <-done:
+		t.Fatalf("the executor finished before reaching the remote: %v", err)
 	}
+	assert.Equal(t, "Basic "+base64.StdEncoding.EncodeToString([]byte("token:secret")), authorization)
 	cancel()
 
 	select {
@@ -736,12 +706,3 @@ func TestNewGitCloneExecutorFetchHonoursContext(t *testing.T) {
 		t.Fatal("fetch ignored context cancellation")
 	}
 }
-
-func TestStaleRefreshErr(t *testing.T) {
-	ctx, cancel := context.WithCancel(t.Context())
-	require.NoError(t, staleRefreshErr(ctx, errors.New("remote hung up")))
-
-	cancel()
-	require.ErrorIs(t, staleRefreshErr(ctx, errors.New("remote hung up")), context.Canceled)
-	require.NoError(t, staleRefreshErr(ctx, gogit.NoErrAlreadyUpToDate))
-}

act/common/job_error.go

@@ -14,13 +14,8 @@ const jobErrorContextKeyVal = jobErrorContextKey("job.error")
 
 // JobError returns the job error for current context if any
 func JobError(ctx context.Context) error {
-	val := ctx.Value(jobErrorContextKeyVal)
-	if val != nil {
-		if container, ok := val.(map[string]error); ok {
-			return container["error"]
-		}
-	}
-	return nil
+	container, _ := ctx.Value(jobErrorContextKeyVal).(map[string]error)
+	return container["error"]
 }
 
 func SetJobError(ctx context.Context, err error) {
@@ -31,6 +26,5 @@ func SetJobError(ctx context.Context, err error) {
 
 // WithJobErrorContainer adds a value to the context as a container for an error
 func WithJobErrorContainer(ctx context.Context) context.Context {
-	container := map[string]error{}
-	return context.WithValue(ctx, jobErrorContextKeyVal, container)
+	return context.WithValue(ctx, jobErrorContextKeyVal, map[string]error{})
 }

act/common/line_writer.go

@@ -26,9 +26,7 @@ type lineWriter struct {
 
 // NewLineWriter creates a new instance of a line writer
 func NewLineWriter(handlers ...LineHandler) io.Writer {
-	w := new(lineWriter)
-	w.handlers = handlers
-	return w
+	return &lineWriter{handlers: handlers}
 }
 
 // FlushWriter flushes w if it implements Flusher. It is a no-op otherwise, so
@@ -39,24 +37,15 @@ func FlushWriter(w io.Writer) {
 	}
 }
 
-func (lw *lineWriter) Write(p []byte) (n int, err error) {
-	pBuf := bytes.NewBuffer(p)
-	written := 0
-	for {
-		line, err := pBuf.ReadString('\n')
-		w, _ := lw.buffer.WriteString(line)
-		written += w
-		if err != nil {
-			if err == io.EOF {
-				break
-			}
-			return written, err
+func (lw *lineWriter) Write(p []byte) (int, error) {
+	for line := range bytes.SplitAfterSeq(p, []byte{'\n'}) {
+		_, _ = lw.buffer.Write(line)
+		if len(line) > 0 && line[len(line)-1] == '\n' {
+			lw.handleLine(lw.buffer.String())
+			lw.buffer.Reset()
 		}
-		lw.handleLine(lw.buffer.String())
-		lw.buffer.Reset()
 	}
-
-	return written, nil
+	return len(p), nil
 }
 
 // Flush emits any buffered, not-yet-newline-terminated content as a final line.
@@ -72,8 +61,7 @@ func (lw *lineWriter) Flush() {
 
 func (lw *lineWriter) handleLine(line string) {
 	for _, h := range lw.handlers {
-		ok := h(line)
-		if !ok {
+		if !h(line) {
 			break
 		}
 	}

act/common/line_writer_test.go

@@ -9,24 +9,24 @@ import (
 	"testing"
 
 	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
 )
 
-func TestLineWriter(t *testing.T) {
-	lines := make([]string, 0)
-	lineHandler := func(s string) bool {
+func TestLineWriterBuffersAndFlushesLines(t *testing.T) {
+	var lines []string
+	lineWriter := NewLineWriter(func(s string) bool {
 		lines = append(lines, s)
 		return true
-	}
-
-	lineWriter := NewLineWriter(lineHandler)
+	})
 
 	assert := assert.New(t)
 	write := func(s string) {
 		n, err := lineWriter.Write([]byte(s))
-		assert.NoError(err) //nolint:testifylint // pre-existing issue from nektos/act
+		require.NoError(t, err)
 		assert.Equal(len(s), n, s)
 	}
 
+	write("")
 	write("hello")
 	write(" ")
 	write("world!!\nextra")
@@ -34,39 +34,17 @@ func TestLineWriter(t *testing.T) {
 	write(" line\n")
 	write("no newline here...")
 
-	assert.Len(lines, 4)
-	assert.Equal("hello world!!\n", lines[0])
-	assert.Equal("extra line\n", lines[1])
-	assert.Equal(" and another\n", lines[2])
-	assert.Equal("last line\n", lines[3])
-}
+	expected := []string{"hello world!!\n", "extra line\n", " and another\n", "last line\n"}
+	assert.Equal(expected, lines)
 
-func TestLineWriterFlush(t *testing.T) {
-	lines := make([]string, 0)
-	lineHandler := func(s string) bool {
-		lines = append(lines, s)
-		return true
-	}
-
-	lineWriter := NewLineWriter(lineHandler)
-
-	assert := assert.New(t)
-	_, err := lineWriter.Write([]byte("complete line\npartial line without newline"))
-	assert.NoError(err) //nolint:testifylint // pre-existing pattern from nektos/act
-
-	// Only the newline-terminated line is emitted before flushing.
-	assert.Equal([]string{"complete line\n"}, lines)
-
-	// Flushing emits the buffered, not-yet-terminated trailing line.
 	FlushWriter(lineWriter)
-	assert.Equal([]string{"complete line\n", "partial line without newline"}, lines)
+	expected = append(expected, "no newline here...")
+	assert.Equal(expected, lines)
 
-	// Flushing again is a no-op: nothing is buffered.
 	FlushWriter(lineWriter)
-	assert.Len(lines, 2)
+	assert.Equal(expected, lines)
 }
 
 func TestFlushWriterIgnoresNonFlusher(t *testing.T) {
-	// FlushWriter must be a safe no-op for writers that do not buffer lines.
 	assert.NotPanics(t, func() { FlushWriter(io.Discard) })
 }

act/common/logger.go

@@ -7,46 +7,51 @@ package common
 import (
 	"context"
 
-	"github.com/sirupsen/logrus"
+	"gitea.com/gitea/runner/act/common/logging"
 )
 
 type loggerContextKey string
 
-const loggerContextKeyVal = loggerContextKey("logrus.FieldLogger")
+const loggerContextKeyVal = loggerContextKey("logging.Logger")
 
 // Logger returns the appropriate logger for current context
-func Logger(ctx context.Context) logrus.FieldLogger {
-	val := ctx.Value(loggerContextKeyVal)
-	if val != nil {
-		if logger, ok := val.(logrus.FieldLogger); ok {
-			return logger
-		}
+func Logger(ctx context.Context) *logging.Logger {
+	if logger, ok := ctx.Value(loggerContextKeyVal).(*logging.Logger); ok {
+		return logger
 	}
-	return logrus.StandardLogger()
+	return logging.Default()
 }
 
 // WithLogger adds a value to the context for the logger
-func WithLogger(ctx context.Context, logger logrus.FieldLogger) context.Context {
+func WithLogger(ctx context.Context, logger *logging.Logger) context.Context {
 	return context.WithValue(ctx, loggerContextKeyVal, logger)
 }
 
-type loggerHookKey string
+type loggerHandlerKey string
 
-const loggerHookKeyVal = loggerHookKey("logrus.Hook")
+const loggerHandlerKeyVal = loggerHandlerKey("logging.Handler")
 
-// LoggerHook returns the appropriate logger hook for current context
-// the hook affects job logger, not global logger
-func LoggerHook(ctx context.Context) logrus.Hook {
-	val := ctx.Value(loggerHookKeyVal)
-	if val != nil {
-		if hook, ok := val.(logrus.Hook); ok {
-			return hook
-		}
-	}
-	return nil
+// LoggerHandler returns the extra handler the job logger sends its records to, or nil.
+// It affects the job logger, not the global logger.
+func LoggerHandler(ctx context.Context) logging.Handler {
+	h, _ := ctx.Value(loggerHandlerKeyVal).(logging.Handler)
+	return h
 }
 
-// WithLoggerHook adds a value to the context for the logger hook
-func WithLoggerHook(ctx context.Context, hook logrus.Hook) context.Context {
-	return context.WithValue(ctx, loggerHookKeyVal, hook)
+// WithLoggerHandler adds the extra handler for the job logger to the context
+func WithLoggerHandler(ctx context.Context, h logging.Handler) context.Context {
+	return context.WithValue(ctx, loggerHandlerKeyVal, h)
+}
+
+type stepIDsContextKey struct{}
+
+// StepIDs returns the IDs of the step and the composite steps enclosing the current one, outermost first.
+func StepIDs(ctx context.Context) []string {
+	ids, _ := ctx.Value(stepIDsContextKey{}).([]string)
+	return ids
+}
+
+// WithStepIDs replaces the step IDs in the context
+func WithStepIDs(ctx context.Context, ids []string) context.Context {
+	return context.WithValue(ctx, stepIDsContextKey{}, ids)
 }

act/common/logging/console.go

@@ -0,0 +1,284 @@
+// Copyright 2026 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package logging
+
+import (
+	"bytes"
+	"context"
+	"fmt"
+	"io"
+	"log/slog"
+	"maps"
+	"reflect"
+	"runtime"
+	"slices"
+	"strconv"
+	"strings"
+	"sync"
+	"time"
+)
+
+const (
+	ansiReset    = "\x1b[0m"
+	ansiRed      = "\x1b[31m"
+	ansiYellow   = "\x1b[33m"
+	ansiCyan     = "\x1b[36m"
+	ansiDimCyan  = "\x1b[2;36m"
+	ansiDimWhite = "\x1b[2;37m"
+)
+
+// consoleStart is the zero of the elapsed-seconds stamp used when full timestamps are off.
+var consoleStart = time.Now()
+
+// console is the state shared by every consoleHandler derived from one another.
+type console struct {
+	mu           sync.Mutex
+	out          io.Writer
+	terminal     bool
+	opts         TextOptions
+	reportCaller bool
+	level        slog.LevelVar
+}
+
+func newConsole(out io.Writer) *console {
+	c := &console{}
+	c.setOutput(out)
+	return c
+}
+
+func (c *console) setOutput(w io.Writer) {
+	terminal := checkIfTerminal(w)
+	c.mu.Lock()
+	defer c.mu.Unlock()
+	c.out, c.terminal = w, terminal
+}
+
+// consoleHandler is a slog.Handler writing the text format the runner has always used, so that
+// moving off logrus changes nothing a user can see: sorted key=value fields on a plain stream,
+// and a colored prefix with elapsed or full time on a terminal.
+type consoleHandler struct {
+	c     *console
+	attrs []slog.Attr
+}
+
+func (h *consoleHandler) Enabled(_ context.Context, level slog.Level) bool {
+	return level >= h.c.level.Level()
+}
+
+func (h *consoleHandler) WithAttrs(attrs []slog.Attr) slog.Handler {
+	return &consoleHandler{c: h.c, attrs: append(slices.Clone(h.attrs), attrs...)}
+}
+
+// WithGroup is a no-op, as only NewSlogHandler wraps a consoleHandler and it never groups.
+func (h *consoleHandler) WithGroup(string) slog.Handler { return h }
+
+func (h *consoleHandler) Handle(_ context.Context, r slog.Record) error {
+	c := h.c
+	c.mu.Lock()
+	opts, reportCaller, terminal := c.opts, c.reportCaller, c.terminal
+	c.mu.Unlock()
+
+	data := make(map[string]any, len(h.attrs)+r.NumAttrs())
+	for _, a := range h.attrs {
+		data[a.Key] = a.Value.Resolve().Any()
+	}
+	r.Attrs(func(a slog.Attr) bool {
+		data[a.Key] = a.Value.Resolve().Any()
+		return true
+	})
+
+	var caller *runtime.Frame
+	if reportCaller && r.PC != 0 {
+		frame, _ := runtime.CallersFrames([]uintptr{r.PC}).Next()
+		caller = &frame
+	}
+	prefixFieldClashes(data, caller != nil)
+
+	keys := slices.Sorted(maps.Keys(data))
+
+	var b bytes.Buffer
+	if terminal && !opts.DisableColors {
+		printColored(&b, opts, r, caller, keys, data)
+	} else {
+		printPlain(&b, opts, r, caller, keys, data)
+	}
+
+	line := b.Bytes()
+	if opts.Filter != nil {
+		line = opts.Filter(line)
+	}
+	c.mu.Lock()
+	defer c.mu.Unlock()
+	_, err := c.out.Write(line)
+	return err
+}
+
+// prefixFieldClashes moves fields that share a name with a fixed key out of its way.
+func prefixFieldClashes(data map[string]any, reportCaller bool) {
+	for _, key := range []string{"time", "level", "msg"} {
+		if v, ok := data[key]; ok {
+			data["fields."+key] = v
+			delete(data, key)
+		}
+	}
+	if reportCaller {
+		for _, key := range []string{"func", "file"} {
+			if v, ok := data[key]; ok {
+				data["fields."+key] = v
+			}
+		}
+	}
+}
+
+func printPlain(b *bytes.Buffer, opts TextOptions, r slog.Record, caller *runtime.Frame, keys []string, data map[string]any) {
+	if !opts.DisableTimestamp {
+		appendKeyValue(b, "time", r.Time.Format(time.RFC3339))
+	}
+	appendKeyValue(b, "level", plainLevel(Level(r.Level)))
+	if r.Message != "" {
+		appendKeyValue(b, "msg", r.Message)
+	}
+	if caller != nil {
+		funcVal, fileVal := callerText(opts, caller)
+		if funcVal != "" {
+			appendKeyValue(b, "func", funcVal)
+		}
+		if fileVal != "" {
+			appendKeyValue(b, "file", fileVal)
+		}
+	}
+	for _, k := range keys {
+		appendKeyValue(b, k, data[k])
+	}
+	b.WriteByte('\n')
+}
+
+func callerText(opts TextOptions, caller *runtime.Frame) (funcVal, fileVal string) {
+	if opts.CallerPrettyfier != nil {
+		return opts.CallerPrettyfier(caller)
+	}
+	return caller.Function, caller.File + ":" + strconv.Itoa(caller.Line)
+}
+
+func printColored(b *bytes.Buffer, opts TextOptions, r slog.Record, caller *runtime.Frame, keys []string, data map[string]any) {
+	msg := strings.TrimSuffix(r.Message, "\n")
+
+	var callerStr string
+	if caller != nil {
+		funcVal, fileVal := callerText(opts, caller)
+		if opts.CallerPrettyfier == nil && caller.Function != "" {
+			funcVal += "()"
+		}
+		switch {
+		case fileVal == "":
+			callerStr = funcVal
+		case funcVal == "":
+			callerStr = fileVal
+		default:
+			callerStr = fileVal + " " + funcVal
+		}
+	}
+
+	level := Level(r.Level)
+	prefix := colorize(level, strings.ToUpper(plainLevel(level))[:4])
+	switch {
+	case opts.DisableTimestamp:
+		fmt.Fprintf(b, "%s%s %-44s ", prefix, callerStr, msg)
+	case !opts.FullTimestamp:
+		fmt.Fprintf(b, "%s[%04d]%s %-44s ", prefix, int(r.Time.Sub(consoleStart)/time.Second), callerStr, msg)
+	default:
+		fmt.Fprintf(b, "%s[%s]%s %-44s ", prefix, r.Time.Format(time.RFC3339), callerStr, msg)
+	}
+	for _, k := range keys {
+		b.WriteByte(' ')
+		b.WriteString(colorize(level, k))
+		b.WriteByte('=')
+		appendValue(b, data[k])
+	}
+	b.WriteByte('\n')
+}
+
+// plainLevel spells Warn the way logrus did, as "warning".
+func plainLevel(l Level) string {
+	if s := l.String(); s != "warn" {
+		return s
+	}
+	return "warning"
+}
+
+func colorize(l Level, s string) string {
+	var color string
+	switch {
+	case l <= LevelTrace:
+		color = ansiDimWhite
+	case l <= LevelDebug:
+		color = ansiDimCyan
+	case l <= LevelInfo:
+		color = ansiCyan
+	case l <= LevelWarn:
+		color = ansiYellow
+	default:
+		color = ansiRed
+	}
+	return color + s + ansiReset
+}
+
+func appendKeyValue(b *bytes.Buffer, key string, value any) {
+	if b.Len() > 0 {
+		b.WriteByte(' ')
+	}
+	b.WriteString(key)
+	b.WriteByte('=')
+	appendValue(b, value)
+}
+
+func appendValue(b *bytes.Buffer, value any) {
+	switch v := value.(type) {
+	case string:
+		appendString(b, v)
+	case []byte:
+		appendString(b, string(v))
+	case error:
+		appendFormatted(b, v, v.Error)
+	case fmt.Stringer:
+		appendFormatted(b, v, v.String)
+	default:
+		appendString(b, fmt.Sprint(value))
+	}
+}
+
+// appendFormatted writes what get returns, and "<nil>" if that panics on a nil receiver.
+func appendFormatted(b *bytes.Buffer, v any, get func() string) {
+	defer func() {
+		if r := recover(); r != nil {
+			if rv := reflect.ValueOf(v); rv.Kind() == reflect.Pointer && rv.IsNil() {
+				appendString(b, "<nil>")
+			} else {
+				appendString(b, fmt.Sprintf("%%!v(PANIC=%v)", r))
+			}
+		}
+	}()
+	appendString(b, get())
+}
+
+func appendString(b *bytes.Buffer, s string) {
+	if needsQuoting(s) {
+		b.WriteString(strconv.Quote(s))
+		return
+	}
+	b.WriteString(s)
+}
+
+func needsQuoting(s string) bool {
+	for i := range len(s) {
+		c := s[i]
+		switch {
+		case c >= 'a' && c <= 'z', c >= 'A' && c <= 'Z', c >= '0' && c <= '9':
+		case c == '-', c == '.', c == '_', c == '/', c == '@', c == '^', c == '+':
+		default:
+			return true
+		}
+	}
+	return false
+}

act/common/logging/console_test.go

@@ -0,0 +1,78 @@
+// Copyright 2026 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package logging
+
+import (
+	"bytes"
+	"errors"
+	"log/slog"
+	"runtime"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func consoleLine(t *testing.T, opts TextOptions, terminal, reportCaller bool, build func(*Logger)) string {
+	t.Helper()
+	var out bytes.Buffer
+	c := newConsole(&out)
+	c.opts, c.terminal, c.reportCaller = opts, terminal, reportCaller
+	c.level.Set(slog.LevelDebug)
+	build(New(NewSlogHandler(&consoleHandler{c: c})))
+	return out.String()
+}
+
+func TestConsolePlain(t *testing.T) {
+	line := consoleLine(t, TextOptions{DisableTimestamp: true}, false, false, func(l *Logger) {
+		l.With("job", "build x", "n", 3).WithError(errors.New("boom")).Warnf("hello world")
+		l.With("msg", "clash", "empty", "").Info("")
+	})
+	assert.Equal(t, "level=warning msg=\"hello world\" error=boom job=\"build x\" n=3\n"+
+		"level=info empty= fields.msg=clash\n", line)
+}
+
+func TestConsolePlainTimeFilterAndCaller(t *testing.T) {
+	opts := TextOptions{
+		CallerPrettyfier: func(f *runtime.Frame) (string, string) {
+			return "[fn]", "[" + strings.TrimPrefix(f.Function, "x") + "]"
+		},
+		Filter: func(b []byte) []byte { return bytes.ReplaceAll(b, []byte("secret"), []byte("***")) },
+	}
+	line := consoleLine(t, opts, false, true, func(l *Logger) { l.With("k", "secret").Debugf("a secret") })
+	assert.Regexp(t, `^time="[^"]+" level=debug msg="a \*\*\*" func="\[fn\]" file="\[.*TestConsolePlainTimeFilterAndCaller[^"]*\]" k=\*\*\*\n$`, line)
+}
+
+func TestConsoleColored(t *testing.T) {
+	line := consoleLine(t, TextOptions{DisableTimestamp: true}, true, false, func(l *Logger) {
+		l.With("job", "j").Warn("careful")
+	})
+	assert.Equal(t, "\x1b[33mWARN\x1b[0m "+"careful"+strings.Repeat(" ", 44-len("careful"))+"  \x1b[33mjob\x1b[0m=j\n", line)
+
+	full := consoleLine(t, TextOptions{FullTimestamp: true}, true, false, func(l *Logger) { l.Error("bad") })
+	assert.Regexp(t, `^\x1b\[31mERRO\x1b\[0m\[\d{4}-\d\d-\d\dT[^\]]+\] bad`, full)
+
+	elapsed := consoleLine(t, TextOptions{}, true, false, func(l *Logger) { l.Info("x") })
+	assert.Regexp(t, `^\x1b\[36mINFO\x1b\[0m\[\d{4}\] x`, elapsed)
+
+	plain := consoleLine(t, TextOptions{DisableColors: true, DisableTimestamp: true}, true, false, func(l *Logger) { l.Info("x") })
+	assert.Equal(t, "level=info msg=x\n", plain)
+}
+
+func TestConsoleLevelAndOutput(t *testing.T) {
+	var out bytes.Buffer
+	c := newConsole(&out)
+	h := &consoleHandler{c: c}
+	assert.False(t, h.Enabled(t.Context(), slog.LevelDebug)) // info unless raised
+	c.level.Set(slog.LevelError)
+	assert.False(t, h.Enabled(t.Context(), slog.LevelWarn))
+	assert.True(t, h.Enabled(t.Context(), slog.LevelError))
+
+	rec := slog.NewRecord(time.Unix(0, 0), slog.LevelError, "m", 0)
+	rec.AddAttrs(slog.String("c", "3"))
+	require.NoError(t, h.WithAttrs([]slog.Attr{slog.Int("a", 1)}).Handle(t.Context(), rec))
+	assert.Contains(t, out.String(), "a=1 c=3")
+}

act/common/logging/global.go

@@ -0,0 +1,83 @@
+// Copyright 2026 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package logging
+
+import (
+	"io"
+	"log/slog"
+	"os"
+	"runtime"
+	"sync/atomic"
+)
+
+// TextOptions describes how the process-wide Logger writes a record as text.
+type TextOptions struct {
+	DisableColors    bool
+	DisableTimestamp bool
+	FullTimestamp    bool
+	// CallerPrettyfier renames the function and file reported with a record when ReportCaller is on.
+	CallerPrettyfier func(*runtime.Frame) (function, file string)
+	// Filter rewrites each formatted line, for example to mask secrets.
+	Filter func(line []byte) []byte
+}
+
+var (
+	std      atomic.Pointer[Logger]
+	stdState = newConsole(os.Stderr)
+)
+
+func init() {
+	std.Store(New(NewSlogHandler(&consoleHandler{c: stdState})))
+}
+
+// Default returns the process-wide Logger.
+func Default() *Logger { return std.Load() }
+
+// SetDefault replaces the process-wide Logger, which tests use to capture what the package
+// functions log. SetLevel, GetLevel, SetOutput and the format functions keep configuring the
+// initial console Logger.
+func SetDefault(l *Logger) { std.Store(l) }
+
+// SetLevel sets the minimum level of the initial process-wide Logger.
+func SetLevel(level Level) { stdState.level.Set(slog.Level(level)) }
+
+// GetLevel returns the minimum level of the initial process-wide Logger.
+func GetLevel() Level { return Level(stdState.level.Level()) }
+
+// SetOutput sets where the initial process-wide Logger writes.
+func SetOutput(w io.Writer) { stdState.setOutput(w) }
+
+// Output returns where the initial process-wide Logger writes.
+func Output() io.Writer {
+	stdState.mu.Lock()
+	defer stdState.mu.Unlock()
+	return stdState.out
+}
+
+// SetTextFormat sets the text format of the initial process-wide Logger.
+func SetTextFormat(o TextOptions) {
+	stdState.mu.Lock()
+	defer stdState.mu.Unlock()
+	stdState.opts = o
+}
+
+// SetReportCaller makes the initial process-wide Logger record where each call came from, which costs time.
+func SetReportCaller(on bool) {
+	stdState.mu.Lock()
+	defer stdState.mu.Unlock()
+	stdState.reportCaller = on
+}
+
+func Enabled(level Level) bool { return Default().Enabled(level) }
+
+func With(args ...any) *Logger          { return Default().With(args...) }
+func WithError(err error) *Logger       { return Default().WithError(err) }
+func Debugf(format string, args ...any) { Default().logf(LevelDebug, format, args) }
+func Infof(format string, args ...any)  { Default().logf(LevelInfo, format, args) }
+func Warnf(format string, args ...any)  { Default().logf(LevelWarn, format, args) }
+func Errorf(format string, args ...any) { Default().logf(LevelError, format, args) }
+func Debug(args ...any)                 { Default().log(LevelDebug, args) }
+func Info(args ...any)                  { Default().log(LevelInfo, args) }
+func Warn(args ...any)                  { Default().log(LevelWarn, args) }
+func Error(args ...any)                 { Default().log(LevelError, args) }

act/common/logging/handler.go

@@ -0,0 +1,114 @@
+// Copyright 2026 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package logging
+
+import (
+	"context"
+	"errors"
+	"slices"
+	"time"
+)
+
+// Attr is a structured key/value pair attached to a log record.
+type Attr struct {
+	Key   string
+	Value any
+}
+
+// Record is one log event. Attrs holds the call-site attributes only, the ones added with
+// Logger.With are accumulated by the Handler.
+type Record struct {
+	Time    time.Time
+	Level   Level
+	Message string
+	PC      uintptr // program counter of the logging call, 0 if unknown
+	Attrs   []Attr
+}
+
+// Attr returns the value of the last attribute named key.
+func (r Record) Attr(key string) (any, bool) {
+	for _, a := range slices.Backward(r.Attrs) {
+		if a.Key == key {
+			return a.Value, true
+		}
+	}
+	return nil, false
+}
+
+// Handler consumes records, and is shaped like slog.Handler so that a slog backend can replace
+// the current one without touching callers. Handle must not modify the Attrs slice it is given.
+type Handler interface {
+	Enabled(ctx context.Context, level Level) bool
+	Handle(ctx context.Context, r Record) error
+	// WithAttrs returns a Handler that adds attrs to every record it handles.
+	WithAttrs(attrs []Attr) Handler
+}
+
+type multiHandler []Handler
+
+// NewMultiHandler fans every record out to all handlers that have its level enabled.
+func NewMultiHandler(handlers ...Handler) Handler {
+	return multiHandler(handlers)
+}
+
+func (m multiHandler) Enabled(ctx context.Context, level Level) bool {
+	for _, h := range m {
+		if h.Enabled(ctx, level) {
+			return true
+		}
+	}
+	return false
+}
+
+func (m multiHandler) Handle(ctx context.Context, r Record) error {
+	var errs []error
+	for _, h := range m {
+		if h.Enabled(ctx, r.Level) {
+			errs = append(errs, h.Handle(ctx, r))
+		}
+	}
+	return errors.Join(errs...)
+}
+
+func (m multiHandler) WithAttrs(attrs []Attr) Handler {
+	out := make(multiHandler, len(m))
+	for i, h := range m {
+		out[i] = h.WithAttrs(attrs)
+	}
+	return out
+}
+
+type discardHandler struct{}
+
+// DiscardHandler drops every record.
+var DiscardHandler Handler = discardHandler{}
+
+func (discardHandler) Enabled(context.Context, Level) bool  { return false }
+func (discardHandler) Handle(context.Context, Record) error { return nil }
+func (d discardHandler) WithAttrs([]Attr) Handler           { return d }
+
+type levelHandler struct {
+	h        Handler
+	minLevel Level
+}
+
+// NewLevelHandler passes only records at or above minLevel on to h.
+func NewLevelHandler(h Handler, minLevel Level) Handler {
+	return levelHandler{h: h, minLevel: minLevel}
+}
+
+func (l levelHandler) Enabled(ctx context.Context, level Level) bool {
+	return level >= l.minLevel && l.h.Enabled(ctx, level)
+}
+
+func (l levelHandler) Handle(ctx context.Context, r Record) error {
+	if r.Level < l.minLevel {
+		return nil
+	}
+	return l.h.Handle(ctx, r)
+}
+
+func (l levelHandler) WithAttrs(attrs []Attr) Handler {
+	return levelHandler{h: l.h.WithAttrs(attrs), minLevel: l.minLevel}
+}

act/common/logging/level.go

@@ -0,0 +1,53 @@
+// Copyright 2026 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package logging
+
+import (
+	"fmt"
+	"strings"
+)
+
+// Level is a log severity. The values match log/slog, with Trace added below Debug.
+type Level int
+
+const (
+	LevelTrace Level = -8
+	LevelDebug Level = -4
+	LevelInfo  Level = 0
+	LevelWarn  Level = 4
+	LevelError Level = 8
+)
+
+func (l Level) String() string {
+	switch {
+	case l <= LevelTrace:
+		return "trace"
+	case l <= LevelDebug:
+		return "debug"
+	case l <= LevelInfo:
+		return "info"
+	case l <= LevelWarn:
+		return "warn"
+	default:
+		return "error"
+	}
+}
+
+// ParseLevel accepts every name logrus does. "fatal" and "panic" map to LevelError because
+// the Logger has no level above it.
+func ParseLevel(s string) (Level, error) {
+	switch strings.ToLower(s) {
+	case "trace":
+		return LevelTrace, nil
+	case "debug":
+		return LevelDebug, nil
+	case "info":
+		return LevelInfo, nil
+	case "warn", "warning":
+		return LevelWarn, nil
+	case "error", "fatal", "panic":
+		return LevelError, nil
+	}
+	return LevelInfo, fmt.Errorf("not a valid log level: %q", s)
+}

act/common/logging/logger.go

@@ -0,0 +1,105 @@
+// Copyright 2026 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package logging
+
+import (
+	"context"
+	"fmt"
+	"runtime"
+	"time"
+)
+
+const badKey = "!BADKEY"
+
+// Logger writes printf-style messages with structured attributes to a Handler.
+type Logger struct {
+	h   Handler
+	ctx context.Context
+}
+
+func New(h Handler) *Logger {
+	return &Logger{h: h, ctx: context.Background()}
+}
+
+// With returns a Logger that adds the key/value pairs to every record, like slog.Logger.With.
+func (l *Logger) With(args ...any) *Logger {
+	if len(args) == 0 {
+		return l
+	}
+	return &Logger{h: l.h.WithAttrs(argsToAttrs(args)), ctx: l.ctx}
+}
+
+func (l *Logger) WithError(err error) *Logger {
+	return l.With("error", err)
+}
+
+// WithContext returns a Logger that passes ctx to its Handler.
+func (l *Logger) WithContext(ctx context.Context) *Logger {
+	return &Logger{h: l.h, ctx: ctx}
+}
+
+func (l *Logger) Enabled(level Level) bool {
+	return l.h.Enabled(l.ctx, level)
+}
+
+func (l *Logger) Debugf(format string, args ...any) { l.logf(LevelDebug, format, args) }
+func (l *Logger) Infof(format string, args ...any)  { l.logf(LevelInfo, format, args) }
+func (l *Logger) Warnf(format string, args ...any)  { l.logf(LevelWarn, format, args) }
+func (l *Logger) Errorf(format string, args ...any) { l.logf(LevelError, format, args) }
+
+// Trace and the methods below format their arguments like fmt.Sprint.
+func (l *Logger) Trace(args ...any) { l.log(LevelTrace, args) }
+func (l *Logger) Debug(args ...any) { l.log(LevelDebug, args) }
+func (l *Logger) Info(args ...any)  { l.log(LevelInfo, args) }
+func (l *Logger) Warn(args ...any)  { l.log(LevelWarn, args) }
+func (l *Logger) Error(args ...any) { l.log(LevelError, args) }
+
+func (l *Logger) logf(level Level, format string, args []any) {
+	if !l.Enabled(level) {
+		return
+	}
+	l.emit(callerPC(4), level, fmt.Sprintf(format, args...))
+}
+
+func (l *Logger) log(level Level, args []any) {
+	if !l.Enabled(level) {
+		return
+	}
+	l.emit(callerPC(4), level, fmt.Sprint(args...))
+}
+
+// emit drops the Handler error, as a logger has nowhere to report it.
+func (l *Logger) emit(pc uintptr, level Level, msg string) {
+	_ = l.h.Handle(l.ctx, Record{Time: time.Now(), Level: level, Message: msg, PC: pc})
+}
+
+// callerPC returns the program counter skip frames up, 4 being the caller of an exported method.
+func callerPC(skip int) uintptr {
+	var pcs [1]uintptr
+	runtime.Callers(skip, pcs[:])
+	return pcs[0]
+}
+
+func argsToAttrs(args []any) []Attr {
+	attrs := make([]Attr, 0, len(args)/2+1)
+	for len(args) > 0 {
+		switch k := args[0].(type) {
+		case Attr:
+			attrs = append(attrs, k)
+			args = args[1:]
+		case string:
+			if len(args) == 1 {
+				attrs = append(attrs, Attr{Key: badKey, Value: k})
+				args = nil
+			} else {
+				attrs = append(attrs, Attr{Key: k, Value: args[1]})
+				args = args[2:]
+			}
+		default:
+			attrs = append(attrs, Attr{Key: badKey, Value: k})
+			args = args[1:]
+		}
+	}
+	return attrs
+}

act/common/logging/logging_test.go

@@ -0,0 +1,145 @@
+// Copyright 2026 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package logging_test
+
+import (
+	"errors"
+	"log/slog"
+	"runtime"
+	"strings"
+	"testing"
+
+	"gitea.com/gitea/runner/act/common/logging"
+	"gitea.com/gitea/runner/act/common/logging/logtest"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestParseLevel(t *testing.T) {
+	for in, want := range map[string]logging.Level{
+		"trace": logging.LevelTrace, "DEBUG": logging.LevelDebug, "info": logging.LevelInfo,
+		"warn": logging.LevelWarn, "warning": logging.LevelWarn,
+		"error": logging.LevelError, "fatal": logging.LevelError, "panic": logging.LevelError,
+	} {
+		got, err := logging.ParseLevel(in)
+		require.NoError(t, err, in)
+		assert.Equal(t, want, got, in)
+	}
+	_, err := logging.ParseLevel("loud")
+	require.Error(t, err)
+	assert.Equal(t, "warn", logging.LevelWarn.String())
+}
+
+type countingStringer struct{ n *int }
+
+func (c countingStringer) String() string { *c.n++; return "x" }
+
+func TestLogger(t *testing.T) {
+	h := logtest.NewWithLevel(logging.LevelTrace)
+	assert.Nil(t, h.LastRecord())
+	l := logging.New(h)
+
+	l.With("job", "j1").WithError(errors.New("boom")).Warnf("step %d", 2)
+	l.Info("a", 1, 2, "b")
+	l.With("k").With(7).Debug("x")
+
+	recs := h.AllRecords()
+	require.Len(t, recs, 3)
+	assert.Equal(t, "step 2", recs[0].Message)
+	assert.Equal(t, logging.LevelWarn, recs[0].Level)
+	assert.False(t, recs[0].Time.IsZero())
+	job, _ := recs[0].Attr("job")
+	assert.Equal(t, "j1", job)
+	errv, _ := recs[0].Attr("error")
+	require.EqualError(t, errv.(error), "boom")
+	assert.Equal(t, "a1 2b", recs[1].Message)
+	bad, _ := recs[2].Attr("!BADKEY")
+	assert.Equal(t, 7, bad)
+}
+
+func TestLoggerSkipsFormattingWhenDisabled(t *testing.T) {
+	n := 0
+	l := logging.New(logging.NewLevelHandler(logtest.NewWithLevel(logging.LevelTrace), logging.LevelWarn))
+	l.Debugf("%v", countingStringer{&n})
+	assert.Zero(t, n)
+	assert.False(t, l.Enabled(logging.LevelInfo))
+}
+
+func TestMultiHandler(t *testing.T) {
+	assert.False(t, logging.DiscardHandler.Enabled(t.Context(), logging.LevelError))
+	all, warnOnly := logtest.New(), logtest.NewWithLevel(logging.LevelTrace)
+	l := logging.New(logging.NewMultiHandler(all, logging.NewLevelHandler(warnOnly, logging.LevelWarn), logging.DiscardHandler)).With("a", 1)
+	l.Info("i")
+	l.Error("e")
+	assert.Len(t, all.AllRecords(), 2)
+	require.Len(t, warnOnly.AllRecords(), 1)
+	v, _ := warnOnly.LastRecord().Attr("a")
+	assert.Equal(t, 1, v)
+}
+
+func frameOf(t *testing.T, pc uintptr) runtime.Frame {
+	t.Helper()
+	require.NotZero(t, pc)
+	f, _ := runtime.CallersFrames([]uintptr{pc}).Next()
+	return f
+}
+
+func TestCallerPC(t *testing.T) {
+	l, h := logtest.NewLogger()
+	l.Infof("method")
+	l.Info("method")
+
+	prev := logging.Default()
+	t.Cleanup(func() { logging.SetDefault(prev) })
+	logging.SetDefault(l)
+	logging.Infof("global")
+	logging.Error("global")
+
+	require.Len(t, h.AllRecords(), 4)
+	for _, r := range h.AllRecords() {
+		assert.True(t, strings.HasSuffix(frameOf(t, r.PC).Function, "TestCallerPC"), r.Message)
+	}
+}
+
+func TestDefaultLevel(t *testing.T) {
+	prev := logging.GetLevel()
+	t.Cleanup(func() { logging.SetLevel(prev) })
+
+	logging.SetLevel(logging.LevelWarn)
+	assert.Equal(t, logging.LevelWarn, logging.GetLevel())
+	assert.True(t, logging.Enabled(logging.LevelError))
+	assert.False(t, logging.Enabled(logging.LevelInfo))
+}
+
+func TestSlogHandler(t *testing.T) {
+	var buf strings.Builder
+	l := logging.New(logging.NewSlogHandler(slog.NewTextHandler(&buf, &slog.HandlerOptions{Level: slog.LevelDebug}))).With("job", "j1")
+
+	assert.False(t, l.Enabled(logging.LevelTrace))
+	l.WithError(errors.New("boom")).Errorf("fail %s", "x")
+
+	out := buf.String()
+	assert.Contains(t, out, "level=ERROR")
+	assert.Contains(t, out, `msg="fail x"`)
+	assert.Contains(t, out, "job=j1")
+	assert.Contains(t, out, "error=boom")
+}
+
+func TestSlogBridge(t *testing.T) {
+	h := logtest.SetDefault(t)
+	slog.With("lib", "actionslib").Warn("from a library", "n", 1)
+	_, _, line, _ := runtime.Caller(0)
+	slog.Debug("dropped")
+
+	recs := h.AllRecords()
+	require.Len(t, recs, 1)
+	assert.Equal(t, "from a library", recs[0].Message)
+	assert.Equal(t, logging.LevelWarn, recs[0].Level)
+	lib, _ := recs[0].Attr("lib")
+	assert.Equal(t, "actionslib", lib)
+	n, _ := recs[0].Attr("n")
+	assert.EqualValues(t, 1, n)
+	assert.Equal(t, line-1, frameOf(t, recs[0].PC).Line)
+}

act/common/logging/logtest/logtest.go

@@ -0,0 +1,83 @@
+// Copyright 2026 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+// Package logtest provides a Handler that keeps records in memory for assertions.
+package logtest
+
+import (
+	"context"
+	"slices"
+	"sync"
+	"testing"
+
+	"gitea.com/gitea/runner/act/common/logging"
+)
+
+type store struct {
+	mu      sync.Mutex
+	records []logging.Record
+}
+
+// Handler records what it receives at or above its level. Loggers derived with WithAttrs share one store.
+type Handler struct {
+	store    *store
+	attrs    []logging.Attr
+	minLevel logging.Level
+}
+
+// New records from LevelInfo up, like the logger of logrus's hooks/test.
+func New() *Handler {
+	return NewWithLevel(logging.LevelInfo)
+}
+
+// NewLogger returns a Logger writing to a new Handler from New, and that Handler.
+func NewLogger() (*logging.Logger, *Handler) {
+	h := New()
+	return logging.New(h), h
+}
+
+func NewWithLevel(minLevel logging.Level) *Handler {
+	return &Handler{store: &store{}, minLevel: minLevel}
+}
+
+func (h *Handler) Enabled(_ context.Context, level logging.Level) bool { return level >= h.minLevel }
+
+// Handle stores the record with the attributes accumulated by WithAttrs placed first.
+func (h *Handler) Handle(_ context.Context, r logging.Record) error {
+	r.Attrs = append(slices.Clone(h.attrs), r.Attrs...)
+	h.store.mu.Lock()
+	defer h.store.mu.Unlock()
+	h.store.records = append(h.store.records, r)
+	return nil
+}
+
+func (h *Handler) WithAttrs(attrs []logging.Attr) logging.Handler {
+	return &Handler{store: h.store, attrs: append(slices.Clone(h.attrs), attrs...), minLevel: h.minLevel}
+}
+
+func (h *Handler) AllRecords() []logging.Record {
+	h.store.mu.Lock()
+	defer h.store.mu.Unlock()
+	return slices.Clone(h.store.records)
+}
+
+// LastRecord returns nil when nothing was logged.
+func (h *Handler) LastRecord() *logging.Record {
+	h.store.mu.Lock()
+	defer h.store.mu.Unlock()
+	if len(h.store.records) == 0 {
+		return nil
+	}
+	r := h.store.records[len(h.store.records)-1]
+	return &r
+}
+
+// SetDefault makes the process-wide Logger record into a new Handler until the test ends.
+func SetDefault(t testing.TB) *Handler {
+	t.Helper()
+	prev := logging.Default()
+	logger, h := NewLogger()
+	logging.SetDefault(logger)
+	t.Cleanup(func() { logging.SetDefault(prev) })
+	return h
+}

act/common/logging/slog.go

@@ -0,0 +1,81 @@
+// Copyright 2026 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package logging
+
+import (
+	"context"
+	"log/slog"
+	"slices"
+)
+
+func init() {
+	slog.SetDefault(slog.New(slogBridge{}))
+}
+
+// slogBridge hands what libraries log through slog's global logger to the process-wide Logger.
+type slogBridge struct {
+	attrs []Attr
+}
+
+func (b slogBridge) Enabled(ctx context.Context, level slog.Level) bool {
+	return Default().h.Enabled(ctx, Level(level))
+}
+
+func (b slogBridge) Handle(ctx context.Context, r slog.Record) error {
+	h := Default().h
+	if len(b.attrs) > 0 {
+		h = h.WithAttrs(b.attrs)
+	}
+	attrs := make([]Attr, 0, r.NumAttrs())
+	r.Attrs(func(a slog.Attr) bool {
+		attrs = append(attrs, fromSlogAttr(a))
+		return true
+	})
+	return h.Handle(ctx, Record{Time: r.Time, Level: Level(r.Level), Message: r.Message, PC: r.PC, Attrs: attrs})
+}
+
+func (b slogBridge) WithAttrs(attrs []slog.Attr) slog.Handler {
+	out := slices.Clone(b.attrs)
+	for _, a := range attrs {
+		out = append(out, fromSlogAttr(a))
+	}
+	return slogBridge{attrs: out}
+}
+
+func (b slogBridge) WithGroup(string) slog.Handler { return b }
+
+func fromSlogAttr(a slog.Attr) Attr {
+	return Attr{Key: a.Key, Value: a.Value.Resolve().Any()}
+}
+
+type slogHandler struct {
+	h slog.Handler
+}
+
+// NewSlogHandler writes to h. Levels map one to one, as Level uses slog's values.
+func NewSlogHandler(h slog.Handler) Handler {
+	return slogHandler{h: h}
+}
+
+func (s slogHandler) Enabled(ctx context.Context, level Level) bool {
+	return s.h.Enabled(ctx, slog.Level(level))
+}
+
+func (s slogHandler) Handle(ctx context.Context, r Record) error {
+	rec := slog.NewRecord(r.Time, slog.Level(r.Level), r.Message, r.PC)
+	rec.AddAttrs(toSlogAttrs(r.Attrs)...)
+	return s.h.Handle(ctx, rec)
+}
+
+func (s slogHandler) WithAttrs(attrs []Attr) Handler {
+	return slogHandler{h: s.h.WithAttrs(toSlogAttrs(attrs))}
+}
+
+func toSlogAttrs(attrs []Attr) []slog.Attr {
+	out := make([]slog.Attr, len(attrs))
+	for i, a := range attrs {
+		out[i] = slog.Any(a.Key, a.Value)
+	}
+	return out
+}

act/common/logging/terminal_other.go

@@ -0,0 +1,20 @@
+// Copyright 2026 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+//go:build !windows
+
+package logging
+
+import (
+	"io"
+	"os"
+
+	"golang.org/x/term"
+)
+
+func checkIfTerminal(w io.Writer) bool {
+	if f, ok := w.(*os.File); ok {
+		return term.IsTerminal(int(f.Fd()))
+	}
+	return false
+}

act/common/logging/terminal_windows.go

@@ -0,0 +1,27 @@
+// Copyright 2026 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+//go:build windows
+
+package logging
+
+import (
+	"io"
+	"os"
+
+	"golang.org/x/sys/windows"
+)
+
+// checkIfTerminal also turns on virtual terminal processing, which the console needs to show colors.
+func checkIfTerminal(w io.Writer) bool {
+	f, ok := w.(*os.File)
+	if !ok {
+		return false
+	}
+	handle := windows.Handle(f.Fd())
+	var mode uint32
+	if err := windows.GetConsoleMode(handle, &mode); err != nil {
+		return false
+	}
+	return windows.SetConsoleMode(handle, mode|windows.ENABLE_VIRTUAL_TERMINAL_PROCESSING) == nil
+}

act/common/lookup_fold.go

@@ -0,0 +1,20 @@
+// Copyright 2026 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package common
+
+import "strings"
+
+// LookupFold finds name in values, ignoring case where the environment does, as GitHub's inputs always do.
+func LookupFold[V any](values map[string]V, name string, caseInsensitive bool) (V, bool) {
+	if value, ok := values[name]; ok || !caseInsensitive {
+		return value, ok
+	}
+	for key, value := range values {
+		if strings.EqualFold(key, name) {
+			return value, true
+		}
+	}
+	var zero V
+	return zero, false
+}

act/common/outbound_ip.go

@@ -10,6 +10,11 @@ import (
 	"strings"
 )
 
+type interfaceIP struct {
+	net.IP
+	Name string
+}
+
 // GetOutboundIP returns an outbound IP address of this machine.
 // It tries to access the internet and returns the local IP address of the connection.
 // If the machine cannot access the internet, it returns a preferred IP address from network interfaces.
@@ -26,11 +31,7 @@ func GetOutboundIP() net.IP {
 
 	// So the machine cannot access the internet. Pick an IP address from network interfaces.
 	if ifs, err := net.Interfaces(); err == nil {
-		type IP struct {
-			net.IP
-			net.Interface
-		}
-		var ips []IP
+		var ips []interfaceIP
 		for _, i := range ifs {
 			if addrs, err := i.Addrs(); err == nil {
 				for _, addr := range addrs {
@@ -42,40 +43,41 @@ func GetOutboundIP() net.IP {
 						ip = v.IP
 					}
 					if ip.IsGlobalUnicast() {
-						ips = append(ips, IP{ip, i})
+						ips = append(ips, interfaceIP{ip, i.Name})
 					}
 				}
 			}
 		}
-		if len(ips) > 1 {
-			sort.Slice(ips, func(i, j int) bool {
-				ifi := ips[i].Interface
-				ifj := ips[j].Interface
-
-				// ethernet is preferred
-				if vi, vj := strings.HasPrefix(ifi.Name, "e"), strings.HasPrefix(ifj.Name, "e"); vi != vj {
-					return vi
-				}
-
-				ipi := ips[i].IP
-				ipj := ips[j].IP
-
-				// IPv4 is preferred
-				if vi, vj := ipi.To4() != nil, ipj.To4() != nil; vi != vj {
-					return vi
-				}
-
-				// en0 is preferred to en1
-				if ifi.Name != ifj.Name {
-					return ifi.Name < ifj.Name
-				}
-
-				// fallback
-				return ipi.String() < ipj.String()
-			})
-			return ips[0].IP
-		}
+		return preferredIP(ips)
 	}
 
 	return nil
 }
+
+func preferredIP(ips []interfaceIP) net.IP {
+	if len(ips) == 0 {
+		return nil
+	}
+	sort.Slice(ips, func(i, j int) bool {
+		first, second := ips[i], ips[j]
+
+		// ethernet is preferred
+		if vi, vj := strings.HasPrefix(first.Name, "e"), strings.HasPrefix(second.Name, "e"); vi != vj {
+			return vi
+		}
+
+		// IPv4 is preferred
+		if vi, vj := first.To4() != nil, second.To4() != nil; vi != vj {
+			return vi
+		}
+
+		// en0 is preferred to en1
+		if first.Name != second.Name {
+			return first.Name < second.Name
+		}
+
+		// fallback
+		return first.String() < second.String()
+	})
+	return ips[0].IP
+}

act/common/outbound_ip_test.go

@@ -0,0 +1,20 @@
+// Copyright 2026 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package common
+
+import (
+	"net"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestPreferredIP(t *testing.T) {
+	assert.Nil(t, preferredIP(nil))
+	assert.Equal(t, net.ParseIP("2001:db8::1"), preferredIP([]interfaceIP{{IP: net.ParseIP("2001:db8::1")}}))
+	assert.Equal(t, net.ParseIP("2001:db8::1"), preferredIP([]interfaceIP{
+		{IP: net.ParseIP("192.0.2.1"), Name: "wlan0"},
+		{IP: net.ParseIP("2001:db8::1"), Name: "eth0"},
+	}))
+}

act/container/container_types.go

@@ -9,6 +9,11 @@ import (
 	"errors"
 	"fmt"
 	"io"
+	"path"
+	"runtime"
+	"strings"
+	"sync"
+	"sync/atomic"
 
 	"gitea.com/gitea/runner/act/common"
 
@@ -16,6 +21,8 @@ import (
 	"github.com/moby/moby/api/types/container"
 )
 
+var hostOS = runtime.GOOS // replaced in tests
+
 // ExitCodeError reports a non-zero process exit code from a container command.
 type ExitCodeError int
 
@@ -71,19 +78,29 @@ const (
 	HealthUnhealthy = string(container.Unhealthy)
 )
 
+// marks what a runner creates for its jobs, telling its leftovers from another runner's
+const runnerUUIDLabel = "com.gitea.runner.uuid"
+
 // ErrContainerNotFound reports a container the daemon no longer knows. Its text is a
 // fragment, missingContainerError composes it into the message every operation shares.
 var ErrContainerNotFound = errors.New("does not exist")
 
 // DockerProxy is a job's docker socket, fronting the daemon's for the job's lifetime.
 type DockerProxy struct {
-	Socket string
-	close  func(context.Context) error
+	Socket    string
+	close     func(context.Context) error
+	closeOnce sync.Once
+	closeErr  error
+	mounts    atomic.Value
+}
+
+func (p *DockerProxy) SetMounts(mounts map[string]string) {
+	p.mounts.Store(mounts)
 }
 
-// Close removes what the job created through the socket, then stops serving it.
 func (p *DockerProxy) Close(ctx context.Context) error {
-	return p.close(ctx)
+	p.closeOnce.Do(func() { p.closeErr = p.close(ctx) })
+	return p.closeErr
 }
 
 // Info is a snapshot of a container, as of one inspect.
@@ -98,6 +115,16 @@ type Info struct {
 	Mounts       map[string]string // container path to its source on the daemon
 }
 
+// DaemonPath maps target to its daemon path through the nearest mount with a source, empty without one.
+func (info *Info) DaemonPath(target string) string {
+	for dir := target; dir != "/" && dir != "."; dir = path.Dir(dir) {
+		if source := info.Mounts[dir]; source != "" {
+			return path.Join(source, strings.TrimPrefix(target, dir))
+		}
+	}
+	return ""
+}
+
 // Container for managing docker run containers
 type Container interface {
 	Create(capAdd, capDrop []string) common.Executor

act/container/docker_auth.go

@@ -2,25 +2,38 @@
 // Copyright 2021 The nektos/act Authors. All rights reserved.
 // SPDX-License-Identifier: MIT
 
-//go:build !(WITHOUT_DOCKER || !(linux || darwin || windows || netbsd))
+//go:build !(WITHOUT_DOCKER || !(linux || darwin || windows || netbsd || freebsd))
 
 package container
 
 import (
+	"bytes"
 	"context"
+	"encoding/base64"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"io/fs"
+	"maps"
+	"net"
+	"net/url"
+	"os"
+	"os/exec"
+	"os/user"
+	"path/filepath"
+	"runtime"
+	"strings"
 
 	"gitea.com/gitea/runner/act/common"
 
 	"github.com/distribution/reference"
-	"github.com/docker/cli/cli/config"
 	"github.com/moby/moby/api/types/registry"
 )
 
 func LoadDockerAuthConfig(ctx context.Context, image string) (registry.AuthConfig, error) {
 	logger := common.Logger(ctx)
-	// config.LoadDefaultConfigFile panics on nil io.Writer when the config
-	// file is malformed; use config.Load to route errors through the logger.
-	cfg, err := config.Load(config.Dir())
+	cfg, err := loadDockerConfig(ctx)
 	if err != nil {
 		logger.Warnf("Could not load docker config: %v", err)
 		return registry.AuthConfig{}, err
@@ -34,32 +47,27 @@ func LoadDockerAuthConfig(ctx context.Context, image string) (registry.AuthConfi
 		}
 	}
 
-	authConfig, err := cfg.GetAuthConfig(registryKey)
+	authConfig, err := cfg.authConfig(ctx, registryKey)
 	if err != nil {
 		logger.Warnf("Could not get auth config from docker config: %v", err)
 		return registry.AuthConfig{}, err
 	}
 
-	return registry.AuthConfig(authConfig), nil
+	return authConfig, nil
 }
 
 func LoadDockerAuthConfigs(ctx context.Context) map[string]registry.AuthConfig {
 	logger := common.Logger(ctx)
-	cfg, err := config.Load(config.Dir())
+	cfg, err := loadDockerConfig(ctx)
 	if err != nil {
 		logger.Warnf("Could not load docker config: %v", err)
 		return nil
 	}
-	creds, err := cfg.GetAllCredentials()
+	authConfigs, err := cfg.allAuthConfigs(ctx)
 	if err != nil {
 		logger.Warnf("Could not get docker auth configs: %v", err)
 		return nil
 	}
-	authConfigs := make(map[string]registry.AuthConfig, len(creds))
-	for k, v := range creds {
-		authConfigs[k] = registry.AuthConfig(v)
-	}
-
 	return authConfigs
 }
 
@@ -69,3 +77,226 @@ func registryAuthConfigKey(domainName string) string {
 	}
 	return domainName
 }
+
+type dockerConfig struct {
+	Auths       map[string]registry.AuthConfig `json:"auths"`
+	CredsStore  string                         `json:"credsStore"`
+	CredHelpers map[string]string              `json:"credHelpers"`
+	env         map[string]registry.AuthConfig // from DOCKER_AUTH_CONFIG, nil when unset or unusable
+}
+
+func loadDockerConfig(ctx context.Context) (*dockerConfig, error) {
+	dir := os.Getenv("DOCKER_CONFIG")
+	if dir == "" {
+		home, _ := os.UserHomeDir()
+		if home == "" && runtime.GOOS != "windows" {
+			if current, err := user.Current(); err == nil {
+				home = current.HomeDir
+			}
+		}
+		dir = filepath.Join(home, ".docker")
+	}
+	cfg := &dockerConfig{}
+	filename := filepath.Join(dir, "config.json")
+	file, err := os.Open(filename)
+	if err != nil && !errors.Is(err, fs.ErrNotExist) {
+		return nil, fmt.Errorf("loading config file: %w", err)
+	}
+	if err == nil {
+		defer file.Close()
+		if err := json.NewDecoder(file).Decode(cfg); err != nil && !errors.Is(err, io.EOF) {
+			return nil, fmt.Errorf("parsing config file (%s): %w", filename, err)
+		}
+	}
+	for address, auth := range cfg.Auths {
+		if auth.Auth != "" {
+			if auth.Username, auth.Password, err = decodeAuth(auth.Auth); err != nil {
+				return nil, fmt.Errorf("parsing config file (%s): %w", filename, err)
+			}
+		}
+		auth.Auth, auth.ServerAddress = "", address
+		cfg.Auths[address] = auth
+	}
+	if value := os.Getenv("DOCKER_AUTH_CONFIG"); value != "" {
+		if cfg.env, err = parseDockerAuthConfigEnv(value); err != nil {
+			common.Logger(ctx).Warnf("Failed to create credential store from DOCKER_AUTH_CONFIG: %v", err)
+		}
+	}
+	return cfg, nil
+}
+
+func decodeAuth(auth string) (string, string, error) {
+	decoded, err := base64.StdEncoding.DecodeString(auth)
+	if err != nil {
+		return "", "", err
+	}
+	username, password, ok := strings.Cut(string(decoded), ":")
+	if !ok || username == "" {
+		return "", "", errors.New("invalid auth configuration file")
+	}
+	return username, strings.Trim(password, "\x00"), nil
+}
+
+func parseDockerAuthConfigEnv(value string) (map[string]registry.AuthConfig, error) {
+	var env struct {
+		Auths map[string]struct {
+			Auth string `json:"auth"`
+		} `json:"auths"`
+	}
+	decoder := json.NewDecoder(strings.NewReader(value))
+	decoder.DisallowUnknownFields()
+	if err := decoder.Decode(&env); err != nil && !errors.Is(err, io.EOF) {
+		return nil, err
+	}
+	if decoder.More() {
+		return nil, errors.New("DOCKER_AUTH_CONFIG does not support more than one JSON object")
+	}
+	auths := make(map[string]registry.AuthConfig, len(env.Auths))
+	for address, entry := range env.Auths {
+		if entry.Auth == "" {
+			return nil, fmt.Errorf("DOCKER_AUTH_CONFIG environment variable is missing key `auth` for %s", address)
+		}
+		username, password, err := decodeAuth(entry.Auth)
+		if err != nil {
+			return nil, err
+		}
+		auths[address] = registry.AuthConfig{Username: username, Password: password, ServerAddress: address}
+	}
+	return auths, nil
+}
+
+func (c *dockerConfig) authConfig(ctx context.Context, key string) (registry.AuthConfig, error) {
+	if auth, ok := c.env[key]; ok {
+		return auth, nil
+	}
+	helper := c.CredsStore
+	if named, ok := c.CredHelpers[key]; ok {
+		helper = named
+	}
+	if helper == "" {
+		return c.fileAuth(key), nil
+	}
+	auth := c.fileAuth(key)
+	stored, err := helperCredentials(ctx, helper, key)
+	if err != nil {
+		return auth, err
+	}
+	auth.Username, auth.Password, auth.IdentityToken, auth.ServerAddress = stored.Username, stored.Password, stored.IdentityToken, stored.ServerAddress
+	return auth, nil
+}
+
+func (c *dockerConfig) fileAuth(key string) registry.AuthConfig {
+	if auth, ok := c.Auths[key]; ok {
+		return auth
+	}
+	for address, auth := range c.Auths {
+		if registryHostname(address) == key {
+			return auth
+		}
+	}
+	return registry.AuthConfig{}
+}
+
+func (c *dockerConfig) allAuthConfigs(ctx context.Context) (map[string]registry.AuthConfig, error) {
+	var auths map[string]registry.AuthConfig
+	if c.CredsStore == "" {
+		auths = maps.Clone(c.Auths)
+	} else {
+		var err error
+		if auths, err = c.helperAuthConfigs(ctx); err != nil {
+			if c.env == nil {
+				return nil, err
+			}
+			common.Logger(ctx).Warnf("Could not list the credentials of docker-credential-%s: %v", c.CredsStore, err)
+		}
+	}
+	if auths == nil {
+		auths = map[string]registry.AuthConfig{}
+	}
+	maps.Copy(auths, c.env)
+	if c.CredsStore == "" {
+		c.Auths = maps.Clone(auths) // docker's file store holds the DOCKER_AUTH_CONFIG entries after listing, and credHelpers set to "" read it
+	}
+	for address := range c.CredHelpers {
+		auth, err := c.authConfig(ctx, registryAuthConfigKey(address))
+		if err != nil {
+			common.Logger(ctx).Warnf("Failed to get credentials for registry: %s: %v", address, err)
+			continue
+		}
+		auths[address] = auth
+	}
+	return auths, nil
+}
+
+func (c *dockerConfig) helperAuthConfigs(ctx context.Context) (map[string]registry.AuthConfig, error) {
+	out, err := runCredentialHelper(ctx, c.CredsStore, "list", "unused")
+	if err != nil {
+		return nil, fmt.Errorf("error listing credentials - err: %w, out: `%s`", err, strings.TrimSpace(string(out)))
+	}
+	var addresses map[string]string
+	if err := json.NewDecoder(bytes.NewReader(out)).Decode(&addresses); err != nil {
+		return nil, err
+	}
+	auths := make(map[string]registry.AuthConfig, len(addresses))
+	for address := range addresses {
+		stored, err := helperCredentials(ctx, c.CredsStore, address)
+		if err != nil {
+			return nil, err
+		}
+		auth := c.Auths[address]
+		auth.Username, auth.Password, auth.IdentityToken = stored.Username, stored.Password, stored.IdentityToken
+		if auth.ServerAddress == "" {
+			auth.ServerAddress = stored.ServerAddress
+		}
+		auths[address] = auth
+	}
+	return auths, nil
+}
+
+func helperCredentials(ctx context.Context, helper, address string) (registry.AuthConfig, error) {
+	out, err := runCredentialHelper(ctx, helper, "get", address)
+	if err != nil {
+		if strings.TrimSpace(string(out)) == "credentials not found in native keychain" {
+			return registry.AuthConfig{}, nil
+		}
+		return registry.AuthConfig{}, fmt.Errorf("error getting credentials - err: %w, out: `%s`", err, strings.TrimSpace(string(out)))
+	}
+	var stored struct{ Username, Secret string }
+	if err := json.NewDecoder(bytes.NewReader(out)).Decode(&stored); err != nil {
+		return registry.AuthConfig{}, err
+	}
+	if stored.Username == "<token>" {
+		return registry.AuthConfig{IdentityToken: stored.Secret, ServerAddress: address}, nil
+	}
+	return registry.AuthConfig{Username: stored.Username, Password: stored.Secret, ServerAddress: address}, nil
+}
+
+func runCredentialHelper(ctx context.Context, helper, action, input string) ([]byte, error) {
+	cmd := exec.CommandContext(ctx, "docker-credential-"+helper, action)
+	cmd.Stdin = strings.NewReader(input)
+	cmd.Stderr = os.Stderr
+	return cmd.Output()
+}
+
+func registryHostname(address string) string {
+	if _, rest, ok := strings.Cut(address, "://"); ok {
+		if u, err := url.Parse(address); err == nil && u.Hostname() != "" {
+			if u.Port() == "" {
+				return u.Hostname()
+			}
+			return net.JoinHostPort(u.Hostname(), u.Port())
+		}
+		if host, _, _ := strings.Cut(rest, "/"); host != "" {
+			if colon := strings.LastIndex(host, ":"); strings.Count(host, ":") > 1 && !strings.HasPrefix(host, "[") && isDigits(host[colon+1:]) {
+				return net.JoinHostPort(host[:colon], host[colon+1:])
+			}
+			return host
+		}
+	}
+	host, _, _ := strings.Cut(address, "/")
+	return host
+}
+
+func isDigits(s string) bool {
+	return s != "" && strings.Trim(s, "0123456789") == ""
+}

act/container/docker_auth_test.go

@@ -0,0 +1,46 @@
+// Copyright 2026 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+//go:build !windows && !(WITHOUT_DOCKER || !(linux || darwin || netbsd || freebsd))
+
+package container
+
+import (
+	"encoding/base64"
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/moby/moby/api/types/registry"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestLoadDockerAuthConfigFromFileHelpersAndEnv(t *testing.T) {
+	dir := t.TempDir()
+	require.NoError(t, os.WriteFile(filepath.Join(dir, "docker-credential-fake"), []byte("#!/bin/sh\nread -r server\n[ \"$1\" = get ] && [ \"$server\" = helper.example.com ] && exec echo '{\"Username\":\"helped\",\"Secret\":\"pw\"}'\necho 'credentials not found in native keychain'\nexit 1\n"), 0o755))
+	t.Setenv("PATH", dir+string(os.PathListSeparator)+os.Getenv("PATH"))
+	auth := func(credentials string) string { return base64.StdEncoding.EncodeToString([]byte(credentials)) }
+	require.NoError(t, os.WriteFile(filepath.Join(dir, "config.json"), []byte(`{"auths": {"https://legacy.example.com/v1/": {"auth": "`+auth("legacy:pw")+`"}}, "credHelpers": {"helper.example.com": "fake", "gone.example.com": "fake", "env-legacy.example.com": ""}}`), 0o600))
+	t.Setenv("DOCKER_CONFIG", dir)
+	t.Setenv("DOCKER_AUTH_CONFIG", `{"auths": {"env.example.com": {"auth": "`+auth("env:pw")+`"}, "https://env-legacy.example.com/v1/": {"auth": "`+auth("env:pw")+`"}}}`)
+
+	for image, want := range map[string]registry.AuthConfig{
+		"legacy.example.com/app": {Username: "legacy", Password: "pw", ServerAddress: "https://legacy.example.com/v1/"},
+		"helper.example.com/app": {Username: "helped", Password: "pw", ServerAddress: "helper.example.com"},
+		"env.example.com/app":    {Username: "env", Password: "pw", ServerAddress: "env.example.com"},
+		"gone.example.com/app":   {},
+	} {
+		got, err := LoadDockerAuthConfig(t.Context(), image)
+		require.NoError(t, err)
+		assert.Equal(t, want, got, image)
+	}
+	assert.Equal(t, map[string]registry.AuthConfig{
+		"https://legacy.example.com/v1/":     {Username: "legacy", Password: "pw", ServerAddress: "https://legacy.example.com/v1/"},
+		"helper.example.com":                 {Username: "helped", Password: "pw", ServerAddress: "helper.example.com"},
+		"gone.example.com":                   {},
+		"env.example.com":                    {Username: "env", Password: "pw", ServerAddress: "env.example.com"},
+		"https://env-legacy.example.com/v1/": {Username: "env", Password: "pw", ServerAddress: "https://env-legacy.example.com/v1/"},
+		"env-legacy.example.com":             {Username: "env", Password: "pw", ServerAddress: "https://env-legacy.example.com/v1/"},
+	}, LoadDockerAuthConfigs(t.Context()))
+}

act/container/docker_build.go

@@ -2,20 +2,23 @@
 // Copyright 2020 The nektos/act Authors. All rights reserved.
 // SPDX-License-Identifier: MIT
 
-//go:build !(WITHOUT_DOCKER || !(linux || darwin || windows || netbsd))
+//go:build !(WITHOUT_DOCKER || !(linux || darwin || windows || netbsd || freebsd))
 
 package container
 
 import (
+	"archive/tar"
 	"context"
 	"io"
+	"io/fs"
 	"os"
 	"path/filepath"
+	"runtime"
+	"strings"
+	"time"
 
 	"gitea.com/gitea/runner/act/common"
 
-	"github.com/moby/go-archive"
-	"github.com/moby/go-archive/compression"
 	"github.com/moby/moby/client"
 	"github.com/moby/patternmatcher"
 	"github.com/moby/patternmatcher/ignorefile"
@@ -43,9 +46,8 @@ func NewDockerBuildExecutor(input NewDockerBuildExecutorInput) common.Executor {
 
 		logger.Debugf("Building image from '%v'", input.ContextDir)
 
-		tags := []string{input.ImageTag}
 		options := client.ImageBuildOptions{
-			Tags:        tags,
+			Tags:        []string{input.ImageTag},
 			Remove:      true,
 			AuthConfigs: LoadDockerAuthConfigs(ctx),
 			Dockerfile:  input.Dockerfile,
@@ -72,12 +74,10 @@ func NewDockerBuildExecutor(input NewDockerBuildExecutorInput) common.Executor {
 
 		logger.Debugf("Creating image from context dir '%s' with tag '%s' and platform '%s'", input.ContextDir, input.ImageTag, input.Platform)
 		resp, err := cli.ImageBuild(ctx, buildContext, options)
-
-		err = logDockerResponse(logger, resp.Body, err != nil)
 		if err != nil {
 			return err
 		}
-		return nil
+		return logDockerResponse(logger, resp.Body, false)
 	}
 }
 
@@ -115,14 +115,143 @@ func createBuildContext(ctx context.Context, contextDir, relDockerfile string) (
 		includes = append(includes, ".dockerignore", relDockerfile)
 	}
 
-	buildCtx, err := archive.TarWithOptions(contextDir, &archive.TarOptions{
-		Compression:     compression.None,
-		ExcludePatterns: excludes,
-		IncludeFiles:    includes,
-	})
+	pm, err := patternmatcher.New(excludes)
 	if err != nil {
 		return nil, err
 	}
-
-	return buildCtx, nil
+	reader, writer := io.Pipe()
+	go func() { writer.CloseWithError(writeBuildContext(ctx, writer, contextDir, includes, pm)) }()
+	return reader, nil
 }
+
+func writeBuildContext(ctx context.Context, w io.Writer, contextDir string, includes []string, pm *patternmatcher.PatternMatcher) error {
+	contextDir, err := filepath.EvalSymlinks(contextDir)
+	if err != nil {
+		return err
+	}
+	tw := tar.NewWriter(w)
+	seen := map[string]bool{}
+	hardlinks := map[uint64]string{}
+	buffer := make([]byte, 32*1024)
+	for _, include := range includes {
+		include = filepath.FromSlash(include)
+		var parents []parentMatch
+		err := filepath.WalkDir(filepath.Join(contextDir, include), func(file string, entry fs.DirEntry, err error) error {
+			if err != nil {
+				return leaveOut(ctx, file, err)
+			}
+			rel, err := filepath.Rel(contextDir, file)
+			if err != nil || rel == "." {
+				return nil
+			}
+			if rel != include {
+				for len(parents) > 0 && !strings.HasPrefix(rel, parents[len(parents)-1].dir+string(filepath.Separator)) {
+					parents = parents[:len(parents)-1]
+				}
+				var parentInfo patternmatcher.MatchInfo
+				if len(parents) > 0 {
+					parentInfo = parents[len(parents)-1].info
+				}
+				skip, info, err := pm.MatchesUsingParentResults(rel, parentInfo)
+				if err != nil {
+					return err
+				}
+				if entry.IsDir() {
+					parents = append(parents, parentMatch{rel, info})
+				}
+				if skip {
+					if entry.IsDir() && !hasExceptionWithin(pm, rel) {
+						return filepath.SkipDir
+					}
+					return nil
+				}
+			}
+			if seen[rel] {
+				return nil
+			}
+			seen[rel] = true
+			return addBuildContextEntry(ctx, tw, file, rel, entry, hardlinks, buffer)
+		})
+		if err != nil {
+			return err
+		}
+	}
+	return tw.Close()
+}
+
+type parentMatch struct {
+	dir  string
+	info patternmatcher.MatchInfo
+}
+
+func hasExceptionWithin(pm *patternmatcher.PatternMatcher, dir string) bool {
+	dirPrefix := dir + string(filepath.Separator)
+	for _, pattern := range pm.Patterns() {
+		if pattern.Exclusion() && strings.HasPrefix(pattern.String()+string(filepath.Separator), dirPrefix) {
+			return true
+		}
+	}
+	return false
+}
+
+func leaveOut(ctx context.Context, file string, err error) error {
+	common.Logger(ctx).Warnf("Leaving %s out of the build context: %v", file, err)
+	return nil
+}
+
+func addBuildContextEntry(ctx context.Context, tw *tar.Writer, file, rel string, entry fs.DirEntry, hardlinks map[uint64]string, buffer []byte) error {
+	info, err := entry.Info()
+	if err != nil {
+		return leaveOut(ctx, file, err)
+	}
+	if info.Mode()&fs.ModeSocket != 0 {
+		return nil // tar has no socket type
+	}
+	var link string
+	if info.Mode()&fs.ModeSymlink != 0 {
+		if link, err = os.Readlink(file); err != nil {
+			return leaveOut(ctx, file, err)
+		}
+	}
+	header, err := tar.FileInfoHeader(noNameLookups{info}, filepath.ToSlash(link))
+	if err != nil {
+		return err
+	}
+	header.Name = filepath.ToSlash(rel)
+	inode, linked := hardlinkInode(info)
+	if target, ok := hardlinks[inode]; linked && ok {
+		header.Typeflag, header.Linkname, header.Size = tar.TypeLink, target, 0
+	}
+	var content *os.File
+	if header.Typeflag == tar.TypeReg && header.Size > 0 {
+		if content, err = os.Open(file); err != nil {
+			return leaveOut(ctx, file, err)
+		}
+		defer content.Close()
+	}
+	if linked && header.Typeflag != tar.TypeLink {
+		hardlinks[inode] = header.Name
+	}
+	if info.IsDir() {
+		header.Name += "/"
+	}
+	header.Format = tar.FormatPAX
+	header.ModTime = header.ModTime.Truncate(time.Second)
+	header.AccessTime, header.ChangeTime = time.Time{}, time.Time{}
+	if runtime.GOOS == "windows" {
+		header.Mode = header.Mode&0o755 | 0o111 // Windows has no exec bit, so mark everything executable like docker build
+	}
+	if err := tw.WriteHeader(header); err != nil {
+		return err
+	}
+	if content != nil {
+		_, err = io.CopyBuffer(tw, struct{ io.Reader }{content}, buffer) // hides os.File's WriteTo, which would allocate a buffer per file
+	}
+	return err
+}
+
+type noNameLookups struct{ fs.FileInfo } // leaves Uname and Gname empty like docker build, so packing never waits on NSS
+
+func (noNameLookups) Uname() (string, error) { return "", nil }
+
+func (noNameLookups) Gname() (string, error) { return "", nil }

act/container/docker_build_test.go

@@ -0,0 +1,71 @@
+// Copyright 2026 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+//go:build !(WITHOUT_DOCKER || !(linux || darwin || windows || netbsd || freebsd))
+
+package container
+
+import (
+	"archive/tar"
+	"io"
+	"net/http"
+	"net/http/httptest"
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestDockerBuildReportsDaemonError(t *testing.T) {
+	daemon := httptest.NewServer(http.HandlerFunc(func(writer http.ResponseWriter, request *http.Request) {
+		writer.Header().Set("API-Version", "1.47")
+		if strings.HasSuffix(request.URL.Path, "/build") {
+			writer.Header().Set("Content-Type", "application/json")
+			writer.WriteHeader(http.StatusInternalServerError)
+			_, _ = io.WriteString(writer, `{"message":"build rejected"}`)
+		}
+	}))
+	t.Cleanup(daemon.Close)
+	t.Setenv("DOCKER_HOST", daemon.URL)
+	t.Setenv("DOCKER_CONFIG", t.TempDir())
+	t.Setenv("DOCKER_AUTH_CONFIG", "")
+
+	require.ErrorContains(t, NewDockerBuildExecutor(NewDockerBuildExecutorInput{
+		ImageTag: "action:test", Dockerfile: "Dockerfile", BuildContext: strings.NewReader(""),
+	})(t.Context()), "build rejected")
+}
+
+func TestCreateBuildContextFollowsDockerignoreAndSymlinkedRootButKeepsDockerfile(t *testing.T) {
+	dir := t.TempDir()
+	for name, content := range map[string]string{
+		".dockerignore": "*.log\nbuild\n!build/keep.txt\nDockerfile", "Dockerfile": "FROM scratch", "a.txt": "a",
+		"a.log": "log", "build/drop.txt": "drop", "build/keep.txt": "keep",
+	} {
+		require.NoError(t, os.MkdirAll(filepath.Join(dir, filepath.Dir(name)), 0o755))
+		require.NoError(t, os.WriteFile(filepath.Join(dir, name), []byte(content), 0o644))
+	}
+	require.NoError(t, os.Mkdir(filepath.Join(dir, "empty"), 0o755))
+
+	contexts := []string{dir}
+	if link := filepath.Join(t.TempDir(), "link"); os.Symlink(dir, link) == nil {
+		contexts = append(contexts, link, link+string(filepath.Separator))
+	}
+
+	for _, contextDir := range contexts {
+		buildContext, err := createBuildContext(t.Context(), contextDir, "Dockerfile")
+		require.NoError(t, err)
+		var names []string
+		for reader := tar.NewReader(buildContext); ; {
+			header, err := reader.Next()
+			if err == io.EOF {
+				break
+			}
+			require.NoError(t, err)
+			names = append(names, header.Name)
+		}
+		require.NoError(t, buildContext.Close())
+		require.Equal(t, []string{".dockerignore", "a.txt", "build/keep.txt", "empty/", "Dockerfile"}, names, contextDir)
+	}
+}

act/container/docker_build_unix.go

@@ -0,0 +1,18 @@
+// Copyright 2026 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+//go:build !WITHOUT_DOCKER && (linux || darwin || netbsd || freebsd)
+
+package container
+
+import (
+	"io/fs"
+	"syscall"
+)
+
+func hardlinkInode(info fs.FileInfo) (uint64, bool) {
+	if stat, ok := info.Sys().(*syscall.Stat_t); ok && !info.IsDir() && stat.Nlink > 1 {
+		return stat.Ino, true
+	}
+	return 0, false
+}

act/container/docker_build_unix_test.go

@@ -0,0 +1,35 @@
+// Copyright 2026 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+//go:build !WITHOUT_DOCKER && (linux || darwin || netbsd || freebsd)
+
+package container
+
+import (
+	"archive/tar"
+	"os"
+	"path/filepath"
+	"syscall"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestCreateBuildContextKeepsHardlinkedSpecialFilesLinked(t *testing.T) {
+	dir := t.TempDir()
+	require.NoError(t, syscall.Mkfifo(filepath.Join(dir, "first"), 0o644))
+	require.NoError(t, os.Link(filepath.Join(dir, "first"), filepath.Join(dir, "second")))
+
+	buildContext, err := createBuildContext(t.Context(), dir, "Dockerfile")
+	require.NoError(t, err)
+	defer buildContext.Close()
+	reader := tar.NewReader(buildContext)
+	first, err := reader.Next()
+	require.NoError(t, err)
+	assert.Equal(t, byte(tar.TypeFifo), first.Typeflag)
+	second, err := reader.Next()
+	require.NoError(t, err)
+	assert.Equal(t, byte(tar.TypeLink), second.Typeflag)
+	assert.Equal(t, first.Name, second.Linkname)
+}

act/container/docker_build_windows.go

@@ -0,0 +1,10 @@
+// Copyright 2026 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+//go:build !WITHOUT_DOCKER
+
+package container
+
+import "io/fs"
+
+func hardlinkInode(_info fs.FileInfo) (uint64, bool) { return 0, false }

act/container/docker_cli.go

@@ -2,12 +2,14 @@
 // Copyright 2022 The nektos/act Authors. All rights reserved.
 // SPDX-License-Identifier: MIT
 
-//go:build !(WITHOUT_DOCKER || !(linux || darwin || windows || netbsd))
+//go:build !(WITHOUT_DOCKER || !(linux || darwin || windows || netbsd || freebsd))
 
-// This file is exact copy of https://github.com/docker/cli/blob/dfc4efb1e2ab8c06d70d2a1366ad448d2f917e90/cli/command/container/opts.go with:
+// This file is based on https://github.com/docker/cli/blob/4a63305d74332de5ceba7fcbccbc3cbb7412f5ba/cli/command/container/opts.go with:
 // * appended with license information
-// * regexp and loader.ParseVolume in place of the import-restricted internal/lazyregexp and internal/volumespec
-// * invalidParameter from the package's errors.go, and convertPortSet/convertPortMap for the callers in docker_run.go
+// * regexp and ParseVolume in place of the import-restricted internal/lazyregexp and internal/volumespec
+// * cdiDeviceName in place of the container-device-interface parser's IsQualifiedName
+// * jsontext in place of json.Compact for the seccomp profile
+// * invalidParameter from the package's errors.go, and convertPortSet/convertPortMap for nat port types
 //
 // docker/cli is licensed under the Apache License, Version 2.0.
 // See DOCKER_LICENSE for the full license text.
@@ -32,14 +34,12 @@ import (
 	"time"
 
 	cerrdefs "github.com/containerd/errdefs"
-	"github.com/docker/cli/cli/compose/loader"
 	"github.com/docker/cli/opts"
 	"github.com/docker/go-connections/nat"
 	"github.com/moby/moby/api/types/container"
 	"github.com/moby/moby/api/types/mount"
 	"github.com/moby/moby/api/types/network"
 	"github.com/spf13/pflag"
-	cdi "tags.cncf.io/container-device-interface/pkg/parser"
 )
 
 const (
@@ -152,10 +152,8 @@ type containerOptions struct {
 	runtime             string
 	autoRemove          bool
 	init                bool
+	umask               opts.UmaskOpt
 	annotations         *opts.MapOpts
-
-	Image string
-	Args  []string
 }
 
 // addFlags adds all command line flags that will be used by parse to the FlagSet
@@ -326,6 +324,9 @@ func addFlags(flags *pflag.FlagSet) *containerOptions {
 	flags.Var(&copts.shmSize, "shm-size", "Size of /dev/shm")
 	flags.StringVar(&copts.utsMode, "uts", "", "UTS namespace to use")
 	flags.StringVar(&copts.runtime, "runtime", "", "Runtime to use for this container")
+	flags.Var(&copts.umask, "umask", "Set umask for the container")
+	flags.SetAnnotation("umask", "version", []string{"1.56"})
+	flags.SetAnnotation("umask", "ostype", []string{"linux"})
 
 	flags.BoolVar(&copts.init, "init", false, "Run an init inside the container that forwards signals and reaps processes")
 	flags.SetAnnotation("init", "version", []string{"1.25"})
@@ -350,7 +351,7 @@ type containerConfig struct {
 // parse parses the args for the specified command and generates a Config,
 // a HostConfig and returns them with the specified command.
 // If the specified args are not valid, it will return an error.
-func parse(flags *pflag.FlagSet, copts *containerOptions, serverOS string) (*containerConfig, error) { //nolint:gocyclo,unparam // verbatim copy from docker/cli
+func parse(flags *pflag.FlagSet, copts *containerOptions, serverOS string) (*containerConfig, error) { //nolint:gocyclo // verbatim copy from docker/cli
 	var (
 		attachStdin  = copts.attach.Get("stdin")
 		attachStdout = copts.attach.Get("stdout")
@@ -383,7 +384,7 @@ func parse(flags *pflag.FlagSet, copts *containerOptions, serverOS string) (*con
 	volumes := copts.volumes.GetMap()
 	// add any bind targets to the list of container volumes
 	for bind := range volumes {
-		parsed, err := loader.ParseVolume(bind)
+		parsed, err := ParseVolume(bind)
 		if err != nil {
 			return nil, err
 		}
@@ -391,7 +392,7 @@ func parse(flags *pflag.FlagSet, copts *containerOptions, serverOS string) (*con
 		if parsed.Source != "" {
 			toBind := bind
 
-			if parsed.Type == string(mount.TypeBind) {
+			if parsed.Type == mount.TypeBind {
 				if hostPart, targetPath, ok := strings.Cut(bind, ":"); ok {
 					if !filepath.IsAbs(hostPart) && strings.HasPrefix(hostPart, ".") {
 						if absHostPart, err := filepath.Abs(hostPart); err == nil {
@@ -418,12 +419,7 @@ func parse(flags *pflag.FlagSet, copts *containerOptions, serverOS string) (*con
 		tmpfs[k] = v
 	}
 
-	var runCmd, entrypoint []string
-
-	if len(copts.Args) > 0 {
-		runCmd = copts.Args
-	}
-
+	var entrypoint []string
 	if copts.entrypoint != "" {
 		entrypoint = []string{copts.entrypoint}
 	} else if flags.Changed("entrypoint") {
@@ -444,36 +440,15 @@ func parse(flags *pflag.FlagSet, copts *containerOptions, serverOS string) (*con
 	if err != nil {
 		return nil, err
 	}
-	portBindings := network.PortMap{}
-	for port, bindings := range natPortBindings {
-		p, err := network.ParsePort(string(port))
-		if err != nil {
-			return nil, err
-		}
-		portBindings[p] = []network.PortBinding{}
-		for _, b := range bindings {
-			var hostIP netip.Addr
-			if b.HostIP != "" {
-				hostIP, err = netip.ParseAddr(b.HostIP)
-				if err != nil {
-					return nil, err
-				}
-			}
-			portBindings[p] = append(portBindings[p], network.PortBinding{
-				HostIP:   hostIP,
-				HostPort: b.HostPort,
-			})
-		}
+	portBindings, err := convertPortMap(natPortBindings)
+	if err != nil {
+		return nil, err
 	}
 
 	// Add published ports as exposed ports.
-	exposedPorts := network.PortSet{}
-	for port := range ports {
-		p, err := network.ParsePort(string(port))
-		if err != nil {
-			return nil, err
-		}
-		exposedPorts[p] = struct{}{}
+	exposedPorts, err := convertPortSet(ports)
+	if err != nil {
+		return nil, err
 	}
 
 	// Merge in exposed ports to the map of published ports
@@ -499,7 +474,7 @@ func parse(flags *pflag.FlagSet, copts *containerOptions, serverOS string) (*con
 	deviceMappings := make([]container.DeviceMapping, 0, len(devices))
 	cdiDeviceNames := make([]string, 0, len(devices))
 	for _, device := range devices {
-		if cdi.IsQualifiedName(device) {
+		if cdiDeviceName.MatchString(device) {
 			cdiDeviceNames = append(cdiDeviceNames, device)
 			continue
 		}
@@ -614,11 +589,10 @@ func parse(flags *pflag.FlagSet, copts *containerOptions, serverOS string) (*con
 
 	deviceRequests := copts.gpus.Value()
 	if len(cdiDeviceNames) > 0 {
-		cdiDeviceRequest := container.DeviceRequest{
+		deviceRequests = append(deviceRequests, container.DeviceRequest{
 			Driver:    "cdi",
 			DeviceIDs: cdiDeviceNames,
-		}
-		deviceRequests = append(deviceRequests, cdiDeviceRequest)
+		})
 	}
 
 	resources := container.Resources{
@@ -664,8 +638,6 @@ func parse(flags *pflag.FlagSet, copts *containerOptions, serverOS string) (*con
 		AttachStdout: attachStdout,
 		AttachStderr: attachStderr,
 		Env:          envVariables,
-		Cmd:          runCmd,
-		Image:        copts.Image,
 		Volumes:      volumes,
 		Entrypoint:   entrypoint,
 		WorkingDir:   copts.workingDir,
@@ -721,6 +693,7 @@ func parse(flags *pflag.FlagSet, copts *containerOptions, serverOS string) (*con
 		MaskedPaths:    maskedPaths,
 		ReadonlyPaths:  readonlyPaths,
 		Annotations:    copts.annotations.GetAll(),
+		Umask:          copts.umask.Value(),
 	}
 
 	if copts.autoRemove && !hostConfig.RestartPolicy.IsNone() {
@@ -751,6 +724,10 @@ func parse(flags *pflag.FlagSet, copts *containerOptions, serverOS string) (*con
 	}, nil
 }
 
+func isUserDefinedNetwork(mode container.NetworkMode) bool { // Docker's helper uses the host OS instead of the daemon's.
+	return !mode.IsDefault() && mode != network.NetworkBridge && mode != network.NetworkHost && !mode.IsNone() && !mode.IsContainer()
+}
+
 // parseNetworkOpts converts --network advanced options to endpoint-specs, and combines
 // them with the old --network-alias and --links. If returns an error if conflicting options
 // are found.
@@ -779,7 +756,7 @@ func parseNetworkOpts(copts *containerOptions) (map[string]*network.EndpointSett
 	}
 
 	for i, n := range copts.netMode.Value() {
-		if container.NetworkMode(n.Target).IsUserDefined() {
+		if isUserDefinedNetwork(container.NetworkMode(n.Target)) {
 			hasUserDefined = true
 		} else {
 			hasNonUserDefined = true
@@ -805,10 +782,8 @@ func parseNetworkOpts(copts *containerOptions) (map[string]*network.EndpointSett
 		// For backward compatibility: if no custom options are provided for the network,
 		// and only a single network is specified, omit the endpoint-configuration
 		// on the client (the daemon will still create it when creating the container)
-		if i == 0 && len(copts.netMode.Value()) == 1 {
-			if ep == nil || reflect.ValueOf(*ep).IsZero() {
-				continue
-			}
+		if i == 0 && len(copts.netMode.Value()) == 1 && reflect.ValueOf(*ep).IsZero() {
+			continue
 		}
 		endpoints[n.Target] = ep
 	}
@@ -839,14 +814,12 @@ func applyContainerOptions(n *opts.NetworkAttachmentOpts, copts *containerOption
 		return invalidParameter(errors.New("conflicting options: cannot specify both --link-local-ip and per-network link-local IP addresses"))
 	}
 	if copts.aliases.Len() > 0 {
-		n.Aliases = make([]string, copts.aliases.Len())
-		copy(n.Aliases, copts.aliases.GetSlice())
+		n.Aliases = slices.Clone(copts.aliases.GetSlice())
 	}
 	// For a user-defined network, "--link" is an endpoint option, it creates an alias. But,
 	// for the default bridge it defines a legacy-link.
-	if container.NetworkMode(n.Target).IsUserDefined() && copts.links.Len() > 0 {
-		n.Links = make([]string, copts.links.Len())
-		copy(n.Links, copts.links.GetSlice())
+	if isUserDefinedNetwork(container.NetworkMode(n.Target)) && copts.links.Len() > 0 {
+		n.Links = slices.Clone(copts.links.GetSlice())
 	}
 	if copts.ipv4Address != nil {
 		if ipv4, ok := netip.AddrFromSlice(copts.ipv4Address.To4()); ok {
@@ -871,7 +844,7 @@ func parseNetworkAttachmentOpt(ep opts.NetworkAttachmentOpts) (*network.Endpoint
 	if strings.TrimSpace(ep.Target) == "" {
 		return nil, errors.New("no name set for network")
 	}
-	if !container.NetworkMode(ep.Target).IsUserDefined() {
+	if !isUserDefinedNetwork(container.NetworkMode(ep.Target)) {
 		if len(ep.Aliases) > 0 {
 			return nil, errors.New("network-scoped aliases are only supported for user-defined networks")
 		}
@@ -885,7 +858,6 @@ func parseNetworkAttachmentOpt(ep opts.NetworkAttachmentOpts) (*network.Endpoint
 	}
 	epConfig.Aliases = append(epConfig.Aliases, ep.Aliases...)
 	if len(ep.DriverOpts) > 0 {
-		epConfig.DriverOpts = make(map[string]string)
 		epConfig.DriverOpts = ep.DriverOpts
 	}
 	if len(ep.Links) > 0 {
@@ -929,11 +901,10 @@ func convertToStandardNotation(ports []string) ([]string, error) {
 }
 
 func parseLoggingOpts(loggingDriver string, loggingOpts []string) (map[string]string, error) {
-	loggingOptsMap := opts.ConvertKVStringsToMap(loggingOpts)
 	if loggingDriver == "none" && len(loggingOpts) > 0 {
 		return map[string]string{}, fmt.Errorf("invalid logging opts for driver %s", loggingDriver)
 	}
-	return loggingOptsMap, nil
+	return opts.ConvertKVStringsToMap(loggingOpts), nil
 }
 
 // takes a local seccomp daemon, reads the file contents for sending to the daemon
@@ -1191,6 +1162,8 @@ func convertPortSet(ports nat.PortSet) (network.PortSet, error) {
 	return converted, nil
 }
 
+var cdiDeviceName = regexp.MustCompile(`^[a-zA-Z]([a-zA-Z0-9_.-]*[a-zA-Z0-9])?/[a-zA-Z]([a-zA-Z0-9_.-]*[a-zA-Z0-9])?=[a-zA-Z0-9]([a-zA-Z0-9_.:-]*[a-zA-Z0-9])?$`)
+
 func convertPortMap(bindings nat.PortMap) (network.PortMap, error) {
 	converted := make(network.PortMap, len(bindings))
 	for port, portBindings := range bindings {

act/container/docker_cli_test.go

@@ -2,7 +2,7 @@
 // Copyright 2022 The nektos/act Authors. All rights reserved.
 // SPDX-License-Identifier: MIT
 
-// This file is exact copy of https://github.com/docker/cli/blob/dfc4efb1e2ab8c06d70d2a1366ad448d2f917e90/cli/command/container/opts_test.go with:
+// This file is based on https://github.com/docker/cli/blob/4a63305d74332de5ceba7fcbccbc3cbb7412f5ba/cli/command/container/opts_test.go with:
 // * appended with license information
 // * added tests for the locally changed parseDevice, validateDevice and invalidParameter
 //
@@ -25,13 +25,11 @@ import (
 	"testing"
 	"time"
 
-	"github.com/google/go-cmp/cmp/cmpopts"
 	"github.com/moby/moby/api/types/container"
 	networktypes "github.com/moby/moby/api/types/network"
 	"github.com/spf13/pflag"
-	"gotest.tools/v3/assert"
-	is "gotest.tools/v3/assert/cmp"
-	"gotest.tools/v3/skip"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
 )
 
 func mustParseMAC(s string) networktypes.HardwareAddr {
@@ -71,7 +69,6 @@ func parseRun(args []string) (*container.Config, *container.HostConfig, *network
 	if err := flags.Parse(args); err != nil {
 		return nil, nil, nil, err
 	}
-	// TODO(dnephin): fix tests to accept ContainerConfig; see https://github.com/moby/moby/pull/31621
 	containerCfg, err := parse(flags, copts, runtime.GOOS)
 	if err != nil {
 		return nil, nil, nil, err
@@ -83,14 +80,13 @@ func setupRunFlags() (*pflag.FlagSet, *containerOptions) {
 	flags := pflag.NewFlagSet("run", pflag.ContinueOnError)
 	flags.SetOutput(io.Discard)
 	flags.Usage = nil
-	copts := addFlags(flags)
-	return flags, copts
+	return flags, addFlags(flags)
 }
 
 func mustParse(t *testing.T, args string) (*container.Config, *container.HostConfig, *networktypes.NetworkingConfig) {
 	t.Helper()
-	config, hostConfig, nwConfig, err := parseRun(append(strings.Split(args, " "), "ubuntu", "bash"))
-	assert.NilError(t, err)
+	config, hostConfig, nwConfig, err := parseRun(strings.Split(args, " "))
+	require.NoError(t, err)
 	return config, hostConfig, nwConfig
 }
 
@@ -156,65 +152,46 @@ func TestParseRunLinks(t *testing.T) {
 	for _, tc := range tests {
 		t.Run(tc.name, func(t *testing.T) {
 			_, hostConfig, netConfig := mustParse(t, tc.input)
-			assert.Check(t, is.DeepEqual(hostConfig.Links, tc.expHostConfigLinks))
-			assert.Check(t, is.Len(netConfig.EndpointsConfig, len(tc.expNetConfigLinks)))
+			assert.Equal(t, tc.expHostConfigLinks, hostConfig.Links)
+			assert.Len(t, netConfig.EndpointsConfig, len(tc.expNetConfigLinks))
 			for netName, expLinks := range tc.expNetConfigLinks {
 				nc, ok := netConfig.EndpointsConfig[netName]
-				assert.Assert(t, ok)
-				assert.Check(t, is.DeepEqual(nc.Links, expLinks))
+				require.True(t, ok)
+				assert.Equal(t, expLinks, nc.Links)
 			}
 		})
 	}
 }
 
+func TestParseRunWithoutUmask(t *testing.T) {
+	_, hostConfig, _, err := parseRun([]string{"ubuntu", "bash"})
+	require.NoError(t, err)
+	require.Nil(t, hostConfig.Umask)
+}
+
+func TestParseRunUmask(t *testing.T) {
+	_, hostConfig, _, err := parseRun([]string{"--umask", "0022", "ubuntu", "bash"})
+	require.NoError(t, err)
+	require.NotNil(t, hostConfig.Umask)
+	require.Equal(t, uint32(0o22), *hostConfig.Umask)
+}
+
 func TestParseRunAttach(t *testing.T) {
-	tests := []struct {
-		input    string
-		expected container.Config
+	for _, tc := range []struct {
+		input                 string
+		stdin, stdout, stderr bool
 	}{
-		{
-			input: "",
-			expected: container.Config{
-				AttachStdout: true,
-				AttachStderr: true,
-			},
-		},
-		{
-			input: "-i",
-			expected: container.Config{
-				AttachStdin:  true,
-				AttachStdout: true,
-				AttachStderr: true,
-			},
-		},
-		{
-			input: "-a stdin",
-			expected: container.Config{
-				AttachStdin: true,
-			},
-		},
-		{
-			input: "-a stdin -a stdout",
-			expected: container.Config{
-				AttachStdin:  true,
-				AttachStdout: true,
-			},
-		},
-		{
-			input: "-a stdin -a stdout -a stderr",
-			expected: container.Config{
-				AttachStdin:  true,
-				AttachStdout: true,
-				AttachStderr: true,
-			},
-		},
-	}
-	for _, tc := range tests {
+		{"", false, true, true},
+		{"-i", true, true, true},
+		{"-a stdin", true, false, false},
+		{"-a stdin -a stdout", true, true, false},
+		{"-a stdin -a stdout -a stderr", true, true, true},
+	} {
 		t.Run(tc.input, func(t *testing.T) {
 			config, _, _ := mustParse(t, tc.input)
-			assert.Equal(t, config.AttachStdin, tc.expected.AttachStdin)
-			assert.Equal(t, config.AttachStdout, tc.expected.AttachStdout)
-			assert.Equal(t, config.AttachStderr, tc.expected.AttachStderr)
+			require.Equal(t, tc.stdin, config.AttachStdin)
+			require.Equal(t, tc.stdout, config.AttachStdout)
+			require.Equal(t, tc.stderr, config.AttachStderr)
 		})
 	}
 }
@@ -260,109 +237,52 @@ func TestParseRunWithInvalidArgs(t *testing.T) {
 	flags, _ := setupRunFlags()
 	for _, tc := range tests {
 		t.Run(strings.Join(tc.args, " "), func(t *testing.T) {
-			assert.Error(t, flags.Parse(tc.args), tc.error)
+			require.EqualError(t, flags.Parse(tc.args), tc.error)
 		})
 	}
 }
 
-func TestParseWithVolumes(t *testing.T) { //nolint:gocyclo // verbatim copy from docker/cli tests
-	// A single volume
-	arr, tryit := setupPlatformVolume([]string{`/tmp`}, []string{`c:\tmp`})
-	if config, hostConfig, _ := mustParse(t, tryit); hostConfig.Binds != nil {
-		t.Fatalf("Error parsing volume flags, %q should not mount-bind anything. Received %v", tryit, hostConfig.Binds)
-	} else if _, exists := config.Volumes[arr[0]]; !exists {
-		t.Fatalf("Error parsing volume flags, %q is missing from volumes. Received %v", tryit, config.Volumes)
-	}
-
-	// Two volumes
-	arr, tryit = setupPlatformVolume([]string{`/tmp`, `/var`}, []string{`c:\tmp`, `c:\var`})
-	if config, hostConfig, _ := mustParse(t, tryit); hostConfig.Binds != nil {
-		t.Fatalf("Error parsing volume flags, %q should not mount-bind anything. Received %v", tryit, hostConfig.Binds)
-	} else if _, exists := config.Volumes[arr[0]]; !exists {
-		t.Fatalf("Error parsing volume flags, %s is missing from volumes. Received %v", arr[0], config.Volumes)
-	} else if _, exists := config.Volumes[arr[1]]; !exists {
-		t.Fatalf("Error parsing volume flags, %s is missing from volumes. Received %v", arr[1], config.Volumes)
-	}
-
-	// A single bind mount
-	arr, tryit = setupPlatformVolume([]string{`/hostTmp:/containerTmp`}, []string{os.Getenv("TEMP") + `:c:\containerTmp`})
-	if config, hostConfig, _ := mustParse(t, tryit); hostConfig.Binds == nil || hostConfig.Binds[0] != arr[0] {
-		t.Fatalf("Error parsing volume flags, %q should mount-bind the path before the colon into the path after the colon. Received %v %v", arr[0], hostConfig.Binds, config.Volumes)
-	}
-
-	// Two bind mounts.
-	arr, tryit = setupPlatformVolume([]string{`/hostTmp:/containerTmp`, `/hostVar:/containerVar`}, []string{os.Getenv("ProgramData") + `:c:\ContainerPD`, os.Getenv("TEMP") + `:c:\containerTmp`})
-	if _, hostConfig, _ := mustParse(t, tryit); hostConfig.Binds == nil || compareRandomizedStrings(hostConfig.Binds[0], hostConfig.Binds[1], arr[0], arr[1]) != nil {
-		t.Fatalf("Error parsing volume flags, `%s and %s` did not mount-bind correctly. Received %v", arr[0], arr[1], hostConfig.Binds)
-	}
-
-	// Two bind mounts, first read-only, second read-write.
-	// TODO Windows: The Windows version uses read-write as that's the only mode it supports. Can change this post TP4
-	arr, tryit = setupPlatformVolume(
-		[]string{`/hostTmp:/containerTmp:ro`, `/hostVar:/containerVar:rw`},
-		[]string{os.Getenv("TEMP") + `:c:\containerTmp:rw`, os.Getenv("ProgramData") + `:c:\ContainerPD:rw`})
-	if _, hostConfig, _ := mustParse(t, tryit); hostConfig.Binds == nil || compareRandomizedStrings(hostConfig.Binds[0], hostConfig.Binds[1], arr[0], arr[1]) != nil {
-		t.Fatalf("Error parsing volume flags, `%s and %s` did not mount-bind correctly. Received %v", arr[0], arr[1], hostConfig.Binds)
-	}
-
-	// Similar to previous test but with alternate modes which are only supported by Linux
-	if runtime.GOOS != "windows" {
-		arr, tryit = setupPlatformVolume([]string{`/hostTmp:/containerTmp:ro,Z`, `/hostVar:/containerVar:rw,Z`}, []string{})
-		if _, hostConfig, _ := mustParse(t, tryit); hostConfig.Binds == nil || compareRandomizedStrings(hostConfig.Binds[0], hostConfig.Binds[1], arr[0], arr[1]) != nil {
-			t.Fatalf("Error parsing volume flags, `%s and %s` did not mount-bind correctly. Received %v", arr[0], arr[1], hostConfig.Binds)
+func TestParseWithVolumes(t *testing.T) {
+	for _, tc := range []struct {
+		unix, windows []string
+		binds         int
+	}{
+		{[]string{`/tmp`}, []string{`c:\tmp`}, 0},
+		{[]string{`/tmp`, `/var`}, []string{`c:\tmp`, `c:\var`}, 0},
+		{[]string{`/hostTmp:/containerTmp`}, []string{os.Getenv("TEMP") + `:c:\containerTmp`}, 1},
+		{[]string{`/hostTmp:/containerTmp`, `/hostVar:/containerVar`}, []string{os.Getenv("ProgramData") + `:c:\ContainerPD`, os.Getenv("TEMP") + `:c:\containerTmp`}, 2},
+		{[]string{`/hostTmp:/containerTmp:ro`, `/hostVar:/containerVar:rw`}, []string{os.Getenv("TEMP") + `:c:\containerTmp:rw`, os.Getenv("ProgramData") + `:c:\ContainerPD:rw`}, 2},
+		{[]string{`/hostTmp:/containerTmp:ro,Z`, `/hostVar:/containerVar:rw,Z`}, nil, 2},
+		{[]string{`/hostTmp:/containerTmp:Z`, `/hostVar:/containerVar:z`}, nil, 2},
+		{[]string{`/hostTmp:/containerTmp`, `/containerVar`}, []string{os.Getenv("TEMP") + `:c:\containerTmp`, `c:\containerTmp`}, 1},
+		{nil, []string{os.Getenv("SystemDrive") + `\:d:`}, 1},
+	} {
+		volumes := tc.unix
+		if runtime.GOOS == "windows" {
+			volumes = tc.windows
 		}
-
-		arr, tryit = setupPlatformVolume([]string{`/hostTmp:/containerTmp:Z`, `/hostVar:/containerVar:z`}, []string{})
-		if _, hostConfig, _ := mustParse(t, tryit); hostConfig.Binds == nil || compareRandomizedStrings(hostConfig.Binds[0], hostConfig.Binds[1], arr[0], arr[1]) != nil {
-			t.Fatalf("Error parsing volume flags, `%s and %s` did not mount-bind correctly. Received %v", arr[0], arr[1], hostConfig.Binds)
+		if len(volumes) == 0 {
+			continue
 		}
+		t.Run(strings.Join(volumes, ","), func(t *testing.T) {
+			var args []string
+			for _, volume := range volumes {
+				args = append(args, "-v", volume)
+			}
+			config, hostConfig, _, err := parseRun(args)
+			require.NoError(t, err)
+			if tc.binds == 0 {
+				assert.Nil(t, hostConfig.Binds)
+			} else {
+				assert.ElementsMatch(t, volumes[:tc.binds], hostConfig.Binds)
+			}
+			expectedVolumes := map[string]struct{}{}
+			for _, volume := range volumes[tc.binds:] {
+				expectedVolumes[volume] = struct{}{}
+			}
+			assert.Equal(t, expectedVolumes, config.Volumes)
+		})
 	}
-
-	// One bind mount and one volume
-	arr, tryit = setupPlatformVolume([]string{`/hostTmp:/containerTmp`, `/containerVar`}, []string{os.Getenv("TEMP") + `:c:\containerTmp`, `c:\containerTmp`})
-	if config, hostConfig, _ := mustParse(t, tryit); hostConfig.Binds == nil || len(hostConfig.Binds) > 1 || hostConfig.Binds[0] != arr[0] {
-		t.Fatalf("Error parsing volume flags, %s and %s should only one and only one bind mount %s. Received %s", arr[0], arr[1], arr[0], hostConfig.Binds)
-	} else if _, exists := config.Volumes[arr[1]]; !exists {
-		t.Fatalf("Error parsing volume flags %s and %s. %s is missing from volumes. Received %v", arr[0], arr[1], arr[1], config.Volumes)
-	}
-
-	// Root to non-c: drive letter (Windows specific)
-	if runtime.GOOS == "windows" {
-		arr, tryit = setupPlatformVolume([]string{}, []string{os.Getenv("SystemDrive") + `\:d:`})
-		if config, hostConfig, _ := mustParse(t, tryit); hostConfig.Binds == nil || len(hostConfig.Binds) > 1 || hostConfig.Binds[0] != arr[0] || len(config.Volumes) != 0 {
-			t.Fatalf("Error parsing %s. Should have a single bind mount and no volumes", arr[0])
-		}
-	}
-}
-
-// setupPlatformVolume takes two arrays of volume specs - a Unix style
-// spec and a Windows style spec. Depending on the platform being unit tested,
-// it returns one of them, along with a volume string that would be passed
-// on the docker CLI (e.g. -v /bar -v /foo).
-func setupPlatformVolume(u, w []string) ([]string, string) {
-	var a []string
-	if runtime.GOOS == "windows" {
-		a = w
-	} else {
-		a = u
-	}
-	s := ""
-	for _, v := range a {
-		s = s + "-v " + v + " "
-	}
-	return a, s
-}
-
-// check if (a == c && b == d) || (a == d && b == c)
-// because maps are randomized
-func compareRandomizedStrings(a, b, c, d string) error {
-	if a == c && b == d {
-		return nil
-	}
-	if a == d && b == c {
-		return nil
-	}
-	return errors.New("strings don't match")
 }
 
 // Simple parse with MacAddress validation
@@ -383,66 +303,49 @@ func TestRunFlagsParseWithMemory(t *testing.T) {
 	flags, _ := setupRunFlags()
 	args := []string{"--memory=invalid", "img", "cmd"}
 	err := flags.Parse(args)
-	assert.ErrorContains(t, err, `invalid argument "invalid" for "-m, --memory" flag`)
+	require.ErrorContains(t, err, `invalid argument "invalid" for "-m, --memory" flag`)
 
 	_, hostconfig, _ := mustParse(t, "--memory=1G")
-	assert.Check(t, is.Equal(int64(1073741824), hostconfig.Memory))
+	assert.Equal(t, int64(1073741824), hostconfig.Memory)
 }
 
 func TestParseWithMemorySwap(t *testing.T) {
 	flags, _ := setupRunFlags()
 	args := []string{"--memory-swap=invalid", "img", "cmd"}
 	err := flags.Parse(args)
-	assert.ErrorContains(t, err, `invalid argument "invalid" for "--memory-swap" flag`)
+	require.ErrorContains(t, err, `invalid argument "invalid" for "--memory-swap" flag`)
 
 	_, hostconfig, _ := mustParse(t, "--memory-swap=1G")
-	assert.Check(t, is.Equal(int64(1073741824), hostconfig.MemorySwap))
+	assert.Equal(t, int64(1073741824), hostconfig.MemorySwap)
 
 	_, hostconfig, _ = mustParse(t, "--memory-swap=-1")
-	assert.Check(t, is.Equal(int64(-1), hostconfig.MemorySwap))
+	assert.Equal(t, int64(-1), hostconfig.MemorySwap)
 }
 
 func TestParseHostname(t *testing.T) {
-	validHostnames := map[string]string{
-		"hostname":    "hostname",
-		"host-name":   "host-name",
-		"hostname123": "hostname123",
-		"123hostname": "123hostname",
-		"hostname-of-63-bytes-long-should-be-valid-and-without-any-error": "hostname-of-63-bytes-long-should-be-valid-and-without-any-error",
-	}
-	hostnameWithDomain := "--hostname=hostname.domainname"
-	hostnameWithDomainTld := "--hostname=hostname.domainname.tld"
-	for hostname, expectedHostname := range validHostnames {
-		if config, _, _ := mustParse(t, "--hostname="+hostname); config.Hostname != expectedHostname {
-			t.Fatalf("Expected the config to have 'hostname' as %q, got %q", expectedHostname, config.Hostname)
-		}
-	}
-	if config, _, _ := mustParse(t, hostnameWithDomain); config.Hostname != "hostname.domainname" || config.Domainname != "" {
-		t.Fatalf("Expected the config to have 'hostname' as hostname.domainname, got %q", config.Hostname)
-	}
-	if config, _, _ := mustParse(t, hostnameWithDomainTld); config.Hostname != "hostname.domainname.tld" || config.Domainname != "" {
-		t.Fatalf("Expected the config to have 'hostname' as hostname.domainname.tld, got %q", config.Hostname)
-	}
-}
-
-func TestParseHostnameDomainname(t *testing.T) {
-	validDomainnames := map[string]string{
-		"domainname":    "domainname",
-		"domain-name":   "domain-name",
-		"domainname123": "domainname123",
-		"123domainname": "123domainname",
-		"domainname-63-bytes-long-should-be-valid-and-without-any-errors": "domainname-63-bytes-long-should-be-valid-and-without-any-errors",
-	}
-	for domainname, expectedDomainname := range validDomainnames {
-		if config, _, _ := mustParse(t, "--domainname="+domainname); config.Domainname != expectedDomainname {
-			t.Fatalf("Expected the config to have 'domainname' as %q, got %q", expectedDomainname, config.Domainname)
-		}
-	}
-	if config, _, _ := mustParse(t, "--hostname=some.prefix --domainname=domainname"); config.Hostname != "some.prefix" || config.Domainname != "domainname" {
-		t.Fatalf("Expected the config to have 'hostname' as 'some.prefix' and 'domainname' as 'domainname', got %q and %q", config.Hostname, config.Domainname)
-	}
-	if config, _, _ := mustParse(t, "--hostname=another-prefix --domainname=domainname.tld"); config.Hostname != "another-prefix" || config.Domainname != "domainname.tld" {
-		t.Fatalf("Expected the config to have 'hostname' as 'another-prefix' and 'domainname' as 'domainname.tld', got %q and %q", config.Hostname, config.Domainname)
+	for _, tc := range []struct {
+		input, hostname, domainname string
+	}{
+		{"--hostname=hostname", "hostname", ""},
+		{"--hostname=host-name", "host-name", ""},
+		{"--hostname=hostname123", "hostname123", ""},
+		{"--hostname=123hostname", "123hostname", ""},
+		{"--hostname=hostname-of-63-bytes-long-should-be-valid-and-without-any-error", "hostname-of-63-bytes-long-should-be-valid-and-without-any-error", ""},
+		{"--hostname=hostname.domainname", "hostname.domainname", ""},
+		{"--hostname=hostname.domainname.tld", "hostname.domainname.tld", ""},
+		{"--domainname=domainname", "", "domainname"},
+		{"--domainname=domain-name", "", "domain-name"},
+		{"--domainname=domainname123", "", "domainname123"},
+		{"--domainname=123domainname", "", "123domainname"},
+		{"--domainname=domainname-63-bytes-long-should-be-valid-and-without-any-errors", "", "domainname-63-bytes-long-should-be-valid-and-without-any-errors"},
+		{"--hostname=some.prefix --domainname=domainname", "some.prefix", "domainname"},
+		{"--hostname=another-prefix --domainname=domainname.tld", "another-prefix", "domainname.tld"},
+	} {
+		t.Run(tc.input, func(t *testing.T) {
+			config, _, _ := mustParse(t, tc.input)
+			require.Equal(t, tc.hostname, config.Hostname)
+			require.Equal(t, tc.domainname, config.Domainname)
+		})
 	}
 }
 
@@ -461,7 +364,7 @@ func TestParseWithExpose(t *testing.T) {
 		for expose, expectedError := range tests {
 			t.Run(expose, func(t *testing.T) {
 				_, _, _, err := parseRun([]string{fmt.Sprintf("--expose=%v", expose), "img", "cmd"})
-				assert.Error(t, err, expectedError)
+				require.EqualError(t, err, expectedError)
 			})
 		}
 	})
@@ -476,30 +379,38 @@ func TestParseWithExpose(t *testing.T) {
 		for expose, exposedPorts := range tests {
 			t.Run(expose, func(t *testing.T) {
 				config, _, _, err := parseRun([]string{fmt.Sprintf("--expose=%v", expose), "img", "cmd"})
-				assert.NilError(t, err)
+				require.NoError(t, err)
 				for _, port := range exposedPorts {
 					_, ok := config.ExposedPorts[port]
-					assert.Check(t, ok, "missing port %q in exposed ports: %#+v", port, config.ExposedPorts[port])
+					assert.True(t, ok, "missing port %q in exposed ports: %#+v", port, config.ExposedPorts[port])
 				}
 			})
 		}
 	})
 
 	t.Run("merge with published", func(t *testing.T) {
-		// Merge with actual published port
-		config, _, _, err := parseRun([]string{"--publish=80", "--expose=80-81/tcp", "img", "cmd"})
-		assert.NilError(t, err)
-		assert.Check(t, is.Len(config.ExposedPorts, 2))
+		config, hostConfig, _, err := parseRun([]string{"--publish=80", "--publish=127.0.0.1:8080:80", "--publish=[::1]:8081:80", "--expose=80-81/tcp"})
+		require.NoError(t, err)
+		assert.Equal(t, networktypes.PortMap{
+			networktypes.MustParsePort("80/tcp"): {
+				{},
+				{HostIP: netip.MustParseAddr("127.0.0.1"), HostPort: "8080"},
+				{HostIP: netip.MustParseAddr("::1"), HostPort: "8081"},
+			},
+		}, hostConfig.PortBindings)
+		assert.Len(t, config.ExposedPorts, 2)
 		ports := []networktypes.Port{networktypes.MustParsePort("80/tcp"), networktypes.MustParsePort("81/tcp")}
 		for _, port := range ports {
 			_, ok := config.ExposedPorts[port]
-			assert.Check(t, ok, "missing port %q in exposed ports: %#+v", port, config.ExposedPorts[port])
+			assert.True(t, ok, "missing port %q in exposed ports: %#+v", port, config.ExposedPorts[port])
 		}
 	})
 }
 
 func TestParseDevice(t *testing.T) {
-	skip.If(t, runtime.GOOS != "linux") // Windows and macOS validate server-side
+	if runtime.GOOS != "linux" {
+		t.Skip("Windows and macOS validate server-side")
+	}
 	testCases := []struct {
 		devices        []string
 		deviceMapping  *container.DeviceMapping
@@ -573,17 +484,17 @@ func TestParseDevice(t *testing.T) {
 
 			_, hostconfig, _, err := parseRun(args)
 
-			assert.NilError(t, err)
+			require.NoError(t, err)
 
 			if tc.deviceMapping != nil {
-				if assert.Check(t, is.Len(hostconfig.Devices, 1)) {
-					assert.Check(t, is.DeepEqual(*tc.deviceMapping, hostconfig.Devices[0]))
+				if assert.Len(t, hostconfig.Devices, 1) {
+					assert.Equal(t, *tc.deviceMapping, hostconfig.Devices[0])
 				}
 			} else {
-				assert.Check(t, is.Len(hostconfig.Devices, 0))
+				assert.Empty(t, hostconfig.Devices)
 			}
 
-			assert.Check(t, is.DeepEqual(tc.deviceRequests, hostconfig.DeviceRequests))
+			assert.Equal(t, tc.deviceRequests, hostconfig.DeviceRequests)
 		})
 	}
 }
@@ -652,11 +563,11 @@ func TestParseDeviceByServerOS(t *testing.T) {
 		t.Run(tc.name, func(t *testing.T) {
 			got, err := parseDevice(tc.device, tc.serverOS)
 			if tc.wantErr != "" {
-				assert.Error(t, err, tc.wantErr)
+				require.EqualError(t, err, tc.wantErr)
 				return
 			}
-			assert.NilError(t, err)
-			assert.Equal(t, got, tc.want)
+			require.NoError(t, err)
+			require.Equal(t, tc.want, got)
 		})
 	}
 }
@@ -835,13 +746,13 @@ func TestParseNetworkConfig(t *testing.T) {
 			_, hConfig, nwConfig, err := parseRun(tc.flags)
 
 			if tc.expectedErr != "" {
-				assert.Error(t, err, tc.expectedErr)
+				require.EqualError(t, err, tc.expectedErr)
 				return
 			}
 
-			assert.NilError(t, err)
-			assert.DeepEqual(t, hConfig.NetworkMode, tc.expectedHostCfg.NetworkMode)
-			assert.DeepEqual(t, nwConfig.EndpointsConfig, tc.expected, cmpopts.EquateComparable(netip.Addr{}))
+			require.NoError(t, err)
+			require.Equal(t, tc.expectedHostCfg.NetworkMode, hConfig.NetworkMode)
+			require.Equal(t, tc.expected, nwConfig.EndpointsConfig)
 		})
 	}
 }
@@ -850,24 +761,24 @@ func TestParseModes(t *testing.T) {
 	// pid ko
 	flags, copts := setupRunFlags()
 	args := []string{"--pid=container:", "img", "cmd"}
-	assert.NilError(t, flags.Parse(args))
+	require.NoError(t, flags.Parse(args))
 	_, err := parse(flags, copts, runtime.GOOS)
-	assert.ErrorContains(t, err, "--pid: invalid PID mode")
+	require.ErrorContains(t, err, "--pid: invalid PID mode")
 
 	// pid ok
 	_, hostconfig, _, err := parseRun([]string{"--pid=host", "img", "cmd"})
-	assert.NilError(t, err)
+	require.NoError(t, err)
 	if !hostconfig.PidMode.Valid() {
 		t.Fatalf("Expected a valid PidMode, got %v", hostconfig.PidMode)
 	}
 
 	// uts ko
 	_, _, _, err = parseRun([]string{"--uts=container:", "img", "cmd"}) //nolint:dogsled // verbatim copy from docker/cli tests
-	assert.ErrorContains(t, err, "--uts: invalid UTS mode")
+	require.ErrorContains(t, err, "--uts: invalid UTS mode")
 
 	// uts ok
 	_, hostconfig, _, err = parseRun([]string{"--uts=host", "img", "cmd"})
-	assert.NilError(t, err)
+	require.NoError(t, err)
 	if !hostconfig.UTSMode.Valid() {
 		t.Fatalf("Expected a valid UTSMode, got %v", hostconfig.UTSMode)
 	}
@@ -879,11 +790,11 @@ func TestRunFlagsParseShmSize(t *testing.T) {
 	args := []string{"--shm-size=a128m", "img", "cmd"}
 	expectedErr := `invalid argument "a128m" for "--shm-size" flag:`
 	err := flags.Parse(args)
-	assert.ErrorContains(t, err, expectedErr)
+	require.ErrorContains(t, err, expectedErr)
 
 	// shm-size ok
 	_, hostconfig, _, err := parseRun([]string{"--shm-size=128m", "img", "cmd"})
-	assert.NilError(t, err)
+	require.NoError(t, err)
 	if hostconfig.ShmSize != 134217728 {
 		t.Fatalf("Expected a valid ShmSize, got %d", hostconfig.ShmSize)
 	}
@@ -954,11 +865,11 @@ func TestParseRestartPolicy(t *testing.T) {
 		t.Run(tc.input, func(t *testing.T) {
 			_, hostConfig, _, err := parseRun([]string{"--restart=" + tc.input, "img", "cmd"})
 			if tc.expectedErr != "" {
-				assert.Check(t, is.Error(err, tc.expectedErr))
-				assert.Check(t, is.Nil(hostConfig))
+				assert.Nil(t, hostConfig)
+				assert.EqualError(t, err, tc.expectedErr)
 			} else {
-				assert.NilError(t, err)
-				assert.Check(t, is.DeepEqual(hostConfig.RestartPolicy, tc.expected))
+				require.NoError(t, err)
+				assert.Equal(t, tc.expected, hostConfig.RestartPolicy)
 			}
 		})
 	}
@@ -967,45 +878,33 @@ func TestParseRestartPolicy(t *testing.T) {
 func TestParseRestartPolicyAutoRemove(t *testing.T) {
 	_, _, _, err := parseRun([]string{"--rm", "--restart=always", "img", "cmd"}) //nolint:dogsled // verbatim copy from docker/cli tests
 	const expected = "conflicting options: cannot specify both --restart and --rm"
-	assert.Check(t, is.Error(err, expected))
+	assert.EqualError(t, err, expected)
 }
 
 func TestParseHealth(t *testing.T) {
-	checkOk := func(args ...string) *container.HealthConfig {
-		config, _, _, err := parseRun(args)
-		if err != nil {
-			t.Fatalf("%#v: %v", args, err)
-		}
-		return config.Healthcheck
-	}
-	checkError := func(expected string, args ...string) {
-		config, _, _, err := parseRun(args)
-		if err == nil {
-			t.Fatalf("Expected error, but got %#v", config)
-		}
-		if err.Error() != expected {
-			t.Fatalf("Expected %#v, got %#v", expected, err)
-		}
-	}
-	health := checkOk("--no-healthcheck", "img", "cmd")
-	if health == nil || len(health.Test) != 1 || health.Test[0] != "NONE" {
-		t.Fatalf("--no-healthcheck failed: %#v", health)
-	}
-
-	health = checkOk("--health-cmd=/check.sh -q", "img", "cmd")
-	if len(health.Test) != 2 || health.Test[0] != "CMD-SHELL" || health.Test[1] != "/check.sh -q" {
-		t.Fatalf("--health-cmd: got %#v", health.Test)
-	}
-	if health.Timeout != 0 {
-		t.Fatalf("--health-cmd: timeout = %s", health.Timeout)
-	}
-
-	checkError("--no-healthcheck conflicts with --health-* options",
-		"--no-healthcheck", "--health-cmd=/check.sh -q", "img", "cmd")
-
-	health = checkOk("--health-timeout=2s", "--health-retries=3", "--health-interval=4.5s", "--health-start-period=5s", "--health-start-interval=1s", "img", "cmd")
-	if health.Timeout != 2*time.Second || health.Retries != 3 || health.Interval != 4500*time.Millisecond || health.StartPeriod != 5*time.Second || health.StartInterval != 1*time.Second {
-		t.Fatalf("--health-*: got %#v", health)
+	for _, tc := range []struct {
+		args     []string
+		expected *container.HealthConfig
+		wantErr  string
+	}{
+		{[]string{"--no-healthcheck", "img", "cmd"}, &container.HealthConfig{Test: []string{"NONE"}}, ""},
+		{[]string{"--health-cmd=/check.sh -q", "img", "cmd"}, &container.HealthConfig{Test: []string{"CMD-SHELL", "/check.sh -q"}}, ""},
+		{[]string{"--no-healthcheck", "--health-cmd=/check.sh -q", "img", "cmd"}, nil, "--no-healthcheck conflicts with --health-* options"},
+		{
+			[]string{"--health-timeout=2s", "--health-retries=3", "--health-interval=4.5s", "--health-start-period=5s", "--health-start-interval=1s", "img", "cmd"},
+			&container.HealthConfig{Timeout: 2 * time.Second, Retries: 3, Interval: 4500 * time.Millisecond, StartPeriod: 5 * time.Second, StartInterval: time.Second},
+			"",
+		},
+	} {
+		t.Run(strings.Join(tc.args, " "), func(t *testing.T) {
+			config, _, _, err := parseRun(tc.args)
+			if tc.wantErr != "" {
+				require.EqualError(t, err, tc.wantErr)
+			} else {
+				require.NoError(t, err)
+				require.Equal(t, tc.expected, config.Healthcheck)
+			}
+		})
 	}
 }
 
@@ -1024,93 +923,66 @@ func TestParseLoggingOpts(t *testing.T) {
 	}
 }
 
-func TestParseEnvfileVariables(t *testing.T) { //nolint:dupl // verbatim copy from docker/cli tests
-	expErr := "--env-file: open nonexistent: no such file or directory"
-	if runtime.GOOS == "windows" {
-		expErr = "--env-file: open nonexistent: The system cannot find the file specified."
-	}
-	// env ko
-	if _, _, _, err := parseRun([]string{"--env-file=nonexistent", "img", "cmd"}); err == nil || err.Error() != expErr {
-		t.Fatalf("Expected an error with message '%s', got %v", expErr, err)
-	}
-	// env ok
-	config, _, _, err := parseRun([]string{"--env-file=testdata/valid.env", "img", "cmd"})
-	if err != nil {
-		t.Fatal(err)
-	}
-	if len(config.Env) != 1 || config.Env[0] != "ENV1=value1" {
-		t.Fatalf("Expected a config with [ENV1=value1], got %v", config.Env)
-	}
-	config, _, _, err = parseRun([]string{"--env-file=testdata/valid.env", "--env=ENV2=value2", "img", "cmd"})
-	if err != nil {
-		t.Fatal(err)
-	}
-	if len(config.Env) != 2 || config.Env[0] != "ENV1=value1" || config.Env[1] != "ENV2=value2" {
-		t.Fatalf("Expected a config with [ENV1=value1 ENV2=value2], got %v", config.Env)
+func TestParseFileVariables(t *testing.T) {
+	for _, tc := range []struct {
+		flag, file, key string
+	}{
+		{"env", "valid.env", "ENV"},
+		{"label", "valid.label", "LABEL"},
+	} {
+		t.Run(tc.flag, func(t *testing.T) {
+			expectedError := "no such file or directory"
+			if runtime.GOOS == "windows" {
+				expectedError = "The system cannot find the file specified."
+			}
+			_, _, _, err := parseRun([]string{"--" + tc.flag + "-file=nonexistent"})
+			require.EqualError(t, err, "--"+tc.flag+"-file: open nonexistent: "+expectedError)
+			for _, extra := range []bool{false, true} {
+				args := []string{"--" + tc.flag + "-file=testdata/" + tc.file}
+				expected := []string{tc.key + "1=value1"}
+				if extra {
+					args = append(args, "--"+tc.flag+"="+tc.key+"2=value2")
+					expected = append(expected, tc.key+"2=value2")
+				}
+				config, _, _, err := parseRun(args)
+				require.NoError(t, err)
+				if tc.flag == "env" {
+					assert.Equal(t, expected, config.Env)
+				} else {
+					assert.Len(t, config.Labels, len(expected))
+					for _, label := range expected {
+						key, value, _ := strings.Cut(label, "=")
+						assert.Equal(t, value, config.Labels[key])
+					}
+				}
+			}
+		})
 	}
 }
 
 func TestParseEnvfileVariablesWithBOMUnicode(t *testing.T) {
-	// UTF8 with BOM
-	config, _, _, err := parseRun([]string{"--env-file=testdata/utf8.env", "img", "cmd"})
-	if err != nil {
-		t.Fatal(err)
-	}
-	env := []string{"FOO=BAR", "HELLO=" + string([]byte{0xe6, 0x82, 0xa8, 0xe5, 0xa5, 0xbd}), "BAR=FOO"}
-	if len(config.Env) != len(env) {
-		t.Fatalf("Expected a config with %d env variables, got %v: %v", len(env), len(config.Env), config.Env)
-	}
-	for i, v := range env {
-		if config.Env[i] != v {
-			t.Fatalf("Expected a config with [%s], got %v", v, []byte(config.Env[i]))
-		}
-	}
+	config, _, _, err := parseRun([]string{"--env-file=testdata/utf8.env"})
+	require.NoError(t, err)
+	assert.Equal(t, []string{"FOO=BAR", "HELLO=您好", "BAR=FOO"}, config.Env)
 
-	// UTF16 with BOM
-	e := "invalid utf8 bytes at line"
-	if _, _, _, err := parseRun([]string{"--env-file=testdata/utf16.env", "img", "cmd"}); err == nil || !strings.Contains(err.Error(), e) {
-		t.Fatalf("Expected an error with message '%s', got %v", e, err)
-	}
-	// UTF16BE with BOM
-	if _, _, _, err := parseRun([]string{"--env-file=testdata/utf16be.env", "img", "cmd"}); err == nil || !strings.Contains(err.Error(), e) {
-		t.Fatalf("Expected an error with message '%s', got %v", e, err)
-	}
-}
-
-func TestParseLabelfileVariables(t *testing.T) { //nolint:dupl // verbatim copy from docker/cli tests
-	expErr := "--label-file: open nonexistent: no such file or directory"
-	if runtime.GOOS == "windows" {
-		expErr = "--label-file: open nonexistent: The system cannot find the file specified."
-	}
-	// label ko
-	if _, _, _, err := parseRun([]string{"--label-file=nonexistent", "img", "cmd"}); err == nil || err.Error() != expErr {
-		t.Fatalf("Expected an error with message '%s', got %v", expErr, err)
-	}
-	// label ok
-	config, _, _, err := parseRun([]string{"--label-file=testdata/valid.label", "img", "cmd"})
-	if err != nil {
-		t.Fatal(err)
-	}
-	if len(config.Labels) != 1 || config.Labels["LABEL1"] != "value1" {
-		t.Fatalf("Expected a config with [LABEL1:value1], got %v", config.Labels)
-	}
-	config, _, _, err = parseRun([]string{"--label-file=testdata/valid.label", "--label=LABEL2=value2", "img", "cmd"})
-	if err != nil {
-		t.Fatal(err)
-	}
-	if len(config.Labels) != 2 || config.Labels["LABEL1"] != "value1" || config.Labels["LABEL2"] != "value2" {
-		t.Fatalf("Expected a config with [LABEL1:value1 LABEL2:value2], got %v", config.Labels)
+	for _, file := range []string{"utf16.env", "utf16be.env"} {
+		t.Run(file, func(t *testing.T) {
+			_, _, _, err := parseRun([]string{"--env-file=testdata/" + file})
+			require.ErrorContains(t, err, "invalid utf8 bytes at line")
+		})
 	}
 }
 
 func TestParseEntryPoint(t *testing.T) {
 	config, _, _, err := parseRun([]string{"--entrypoint=anything", "cmd", "img"})
-	assert.NilError(t, err)
-	assert.Check(t, is.DeepEqual(config.Entrypoint, []string{"anything"}))
+	require.NoError(t, err)
+	assert.Equal(t, []string{"anything"}, config.Entrypoint)
 }
 
 func TestValidateDevice(t *testing.T) {
-	skip.If(t, runtime.GOOS != "linux") // Windows and macOS validate server-side
+	if runtime.GOOS != "linux" {
+		t.Skip("Windows and macOS validate server-side")
+	}
 	valid := []string{
 		"/home",
 		"/home:/home",
@@ -1209,22 +1081,22 @@ func TestValidateDeviceByServerOS(t *testing.T) {
 		t.Run(tc.name, func(t *testing.T) {
 			got, err := validateDevice(tc.value, tc.serverOS)
 			if tc.wantError != "" {
-				assert.Error(t, err, tc.wantError)
+				require.EqualError(t, err, tc.wantError)
 				return
 			}
-			assert.NilError(t, err)
-			assert.Equal(t, got, tc.want)
+			require.NoError(t, err)
+			require.Equal(t, tc.want, got)
 		})
 	}
 }
 
 func TestDeviceCgroupRulesAndInvalidParameter(t *testing.T) {
 	got, err := validateDeviceCgroupRule("c 1:3 rwm")
-	assert.NilError(t, err)
-	assert.Equal(t, got, "c 1:3 rwm")
+	require.NoError(t, err)
+	require.Equal(t, "c 1:3 rwm", got)
 
 	_, err = validateDeviceCgroupRule("invalid")
-	assert.Error(t, err, "invalid device cgroup format 'invalid'")
+	require.EqualError(t, err, "invalid device cgroup format 'invalid'")
 
 	if invalidParameter(nil) != nil {
 		t.Fatal("invalidParameter(nil) should be nil")
@@ -1232,9 +1104,9 @@ func TestDeviceCgroupRulesAndInvalidParameter(t *testing.T) {
 	cause := errors.New("bad input")
 	err = invalidParameter(cause)
 	var invalid interface{ InvalidParameter() }
-	assert.Assert(t, errors.As(err, &invalid))
-	assert.Assert(t, errors.Is(err, cause))
-	assert.Equal(t, invalidParameter(err), err) // already invalid, so not wrapped twice
+	require.ErrorAs(t, err, &invalid)
+	require.ErrorIs(t, err, cause)
+	require.Condition(t, func() bool { return invalidParameter(err) == err })
 }
 
 func TestParseSystemPaths(t *testing.T) {
@@ -1285,9 +1157,9 @@ func TestParseSystemPaths(t *testing.T) {
 
 	for _, tc := range tests {
 		securityOpts, maskedPaths, readonlyPaths := parseSystemPaths(tc.in)
-		assert.DeepEqual(t, securityOpts, tc.out)
-		assert.DeepEqual(t, maskedPaths, tc.masked)
-		assert.DeepEqual(t, readonlyPaths, tc.readonly)
+		require.Equal(t, tc.out, securityOpts)
+		require.Equal(t, tc.masked, maskedPaths)
+		require.Equal(t, tc.readonly, readonlyPaths)
 	}
 }
 
@@ -1309,9 +1181,9 @@ func TestConvertToStandardNotation(t *testing.T) {
 	for key, ports := range valid {
 		convertedPorts, err := convertToStandardNotation(ports)
 		if err != nil {
-			assert.NilError(t, err)
+			require.NoError(t, err)
 		}
-		assert.DeepEqual(t, strings.Split(key, " "), convertedPorts)
+		require.Equal(t, strings.Split(key, " "), convertedPorts)
 	}
 
 	for _, ports := range invalid {

act/container/docker_create_flags.go

@@ -1,7 +1,7 @@
 // Copyright 2026 The Gitea Authors. All rights reserved.
 // SPDX-License-Identifier: MIT
 
-//go:build !(WITHOUT_DOCKER || !(linux || darwin || windows || netbsd))
+//go:build !(WITHOUT_DOCKER || !(linux || darwin || windows || netbsd || freebsd))
 
 package container
 

act/container/docker_images.go

@@ -2,16 +2,16 @@
 // Copyright 2020 The nektos/act Authors. All rights reserved.
 // SPDX-License-Identifier: MIT
 
-//go:build !(WITHOUT_DOCKER || !(linux || darwin || windows || netbsd))
+//go:build !(WITHOUT_DOCKER || !(linux || darwin || windows || netbsd || freebsd))
 
 package container
 
 import (
 	"context"
-	"fmt"
 
 	cerrdefs "github.com/containerd/errdefs"
 	"github.com/moby/moby/client"
+	specs "github.com/opencontainers/image-spec/specs-go/v1"
 )
 
 // ImageExistsLocally returns a boolean indicating if an image with the
@@ -30,11 +30,23 @@ func ImageExistsLocally(ctx context.Context, imageName, platform string) (bool,
 		return false, err
 	}
 
-	if platform == "" || platform == "any" || fmt.Sprintf("%s/%s", inspectImage.Os, inspectImage.Architecture) == platform {
+	if platform == "" || platform == "any" {
 		return true, nil
 	}
 
-	return false, nil
+	requested, err := parsePlatform(platform)
+	if err != nil {
+		return false, err
+	}
+	return platformMatches(requested, &specs.Platform{OS: inspectImage.Os, Architecture: inspectImage.Architecture, Variant: inspectImage.Variant}), nil
+}
+
+func platformMatches(requested, image *specs.Platform) bool {
+	variant := image.Variant
+	if variant == "" {
+		variant = map[string]string{"amd64": "v1", "arm": "v7", "arm64": "v8"}[image.Architecture]
+	}
+	return image.OS == requested.OS && image.Architecture == requested.Architecture && (requested.Variant == "" || requested.Variant == variant)
 }
 
 // RemoveImage removes image from local store, the function is used to run different
@@ -46,19 +58,14 @@ func RemoveImage(ctx context.Context, imageName string, force, pruneChildren boo
 	}
 	defer cli.Close()
 
-	inspectImage, err := cli.ImageInspect(ctx, imageName)
-	if cerrdefs.IsNotFound(err) {
+	if _, err = cli.ImageRemove(ctx, imageName, client.ImageRemoveOptions{
+		Force:         force,
+		PruneChildren: pruneChildren,
+	}); cerrdefs.IsNotFound(err) {
 		return false, nil
 	} else if err != nil {
 		return false, err
 	}
 
-	if _, err = cli.ImageRemove(ctx, inspectImage.ID, client.ImageRemoveOptions{
-		Force:         force,
-		PruneChildren: pruneChildren,
-	}); err != nil {
-		return false, err
-	}
-
 	return true, nil
 }

act/container/docker_images_test.go

@@ -5,65 +5,74 @@
 package container
 
 import (
+	"bytes"
 	"context"
 	"fmt"
-	"os"
-	"os/exec"
 	"strings"
 	"testing"
+	"time"
 
-	log "github.com/sirupsen/logrus"
+	"gitea.com/gitea/runner/act/common"
+	"gitea.com/gitea/runner/act/common/logging"
+
+	mobyclient "github.com/moby/moby/client"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 )
 
 func init() {
-	log.SetLevel(log.DebugLevel)
+	logging.SetLevel(logging.LevelDebug)
 }
 
-// buildScratchImage builds a tiny empty image for the given platform locally (FROM scratch, no
-// network or emulation since there is nothing to run) and returns its tag, removing it after
-// the test.
-func buildScratchImage(t *testing.T, platform string) string {
+func loadScratchImage(t *testing.T, platform string) string {
 	t.Helper()
-	tag := fmt.Sprintf("act-test-exists-%s:latest", strings.TrimPrefix(platform, "linux/"))
-	cmd := exec.Command("docker", "build", "--platform", platform, "-t", tag, "-")
-	cmd.Stdin = strings.NewReader("FROM scratch\nLABEL act-test=1\n")
-	// Force BuildKit: it records the requested architecture in the image config for a
-	// FROM-scratch build, whereas the classic builder ignores --platform and tags it with the
-	// host arch, which would break the per-platform existence assertions below.
-	cmd.Env = append(os.Environ(), "DOCKER_BUILDKIT=1")
-	out, err := cmd.CombinedOutput()
-	require.NoError(t, err, string(out))
-	t.Cleanup(func() { _ = exec.Command("docker", "rmi", "-f", tag).Run() })
+	tag := fmt.Sprintf("act-test-exists-%s-%d:latest", strings.TrimPrefix(platform, "linux/"), time.Now().UnixNano())
+	var archive bytes.Buffer
+	require.NoError(t, writeFilesTar(t.Context(), &archive, 0, 0,
+		&FileEntry{Name: "config.json", Mode: 0o600, Body: fmt.Sprintf(`{"architecture":%q,"os":"linux","rootfs":{"type":"layers","diff_ids":[]}}`, strings.TrimPrefix(platform, "linux/"))},
+		&FileEntry{Name: "manifest.json", Mode: 0o600, Body: fmt.Sprintf(`[{"Config":"config.json","RepoTags":[%q],"Layers":[]}]`, tag)},
+	))
+	cli, err := GetDockerClient(t.Context())
+	require.NoError(t, err)
+	t.Cleanup(func() { _ = cli.Close() })
+	response, err := cli.ImageLoad(t.Context(), &archive)
+	require.NoError(t, err)
+	defer response.Close()
+	require.NoError(t, logDockerResponse(common.Logger(t.Context()), response, false))
+	t.Cleanup(func() {
+		_, _ = cli.ImageRemove(context.WithoutCancel(t.Context()), tag, mobyclient.ImageRemoveOptions{Force: true})
+	})
 	return tag
 }
 
 func TestImageExistsLocally(t *testing.T) {
+	t.Parallel()
 	requireDocker(t)
-	ctx := context.Background()
+	ctx := t.Context()
 
-	// a non-existent image is reported absent
 	missing, err := ImageExistsLocally(ctx, "library/alpine:this-random-tag-will-never-exist", "linux/amd64")
 	assert.NoError(t, err) //nolint:testifylint // pre-existing issue from nektos/act
 	assert.False(t, missing)
 
-	// Build tiny images for two architectures locally so per-platform existence can be checked
-	// offline (formerly pulled node:24-bookworm-slim for amd64 and arm64 over the network).
-	amd64Ref := buildScratchImage(t, "linux/amd64")
-	arm64Ref := buildScratchImage(t, "linux/arm64")
+	amd64Ref := loadScratchImage(t, "linux/amd64")
+	arm64Ref := loadScratchImage(t, "linux/arm64")
 
 	amd64Exists, err := ImageExistsLocally(ctx, amd64Ref, "linux/amd64")
 	assert.NoError(t, err) //nolint:testifylint // pre-existing issue from nektos/act
 	assert.True(t, amd64Exists)
 
-	// a non-host architecture image is detected for its own architecture
 	arm64Exists, err := ImageExistsLocally(ctx, arm64Ref, "linux/arm64")
 	assert.NoError(t, err) //nolint:testifylint // pre-existing issue from nektos/act
 	assert.True(t, arm64Exists)
 
-	// a present image is reported absent for a different platform
 	wrongPlatform, err := ImageExistsLocally(ctx, amd64Ref, "linux/arm64")
 	assert.NoError(t, err) //nolint:testifylint // pre-existing issue from nektos/act
 	assert.False(t, wrongPlatform)
+
+	removed, err := RemoveImage(ctx, amd64Ref, false, false)
+	require.NoError(t, err)
+	assert.True(t, removed)
+	removed, err = RemoveImage(ctx, amd64Ref, false, false)
+	require.NoError(t, err)
+	assert.False(t, removed)
 }

act/container/docker_logger.go

@@ -2,7 +2,7 @@
 // Copyright 2020 The nektos/act Authors. All rights reserved.
 // SPDX-License-Identifier: MIT
 
-//go:build !(WITHOUT_DOCKER || !(linux || darwin || windows || netbsd))
+//go:build !(WITHOUT_DOCKER || !(linux || darwin || windows || netbsd || freebsd))
 
 package container
 
@@ -12,7 +12,7 @@ import (
 	"errors"
 	"io"
 
-	"github.com/sirupsen/logrus"
+	"gitea.com/gitea/runner/act/common/logging"
 )
 
 type dockerMessage struct {
@@ -26,25 +26,17 @@ type dockerMessage struct {
 	Progress string `json:"progress"`
 }
 
-func logDockerResponse(logger logrus.FieldLogger, dockerResponse io.ReadCloser, isError bool) error {
+func logDockerResponse(logger *logging.Logger, dockerResponse io.ReadCloser, isError bool) error {
 	if dockerResponse == nil {
 		return nil
 	}
 	defer dockerResponse.Close()
 
 	scanner := bufio.NewScanner(dockerResponse)
-	msg := dockerMessage{}
-
+	scanner.Buffer(nil, 64*1024*1024) // a build echoes long instructions in one record
 	for scanner.Scan() {
 		line := scanner.Bytes()
-
-		msg.ID = ""
-		msg.Stream = ""
-		msg.Error = ""
-		msg.ErrorDetail.Message = ""
-		msg.Status = ""
-		msg.Progress = ""
-
+		var msg dockerMessage
 		if err := json.Unmarshal(line, &msg); err != nil {
 			writeLog(logger, false, "Unable to unmarshal line [%s] ==> %v", string(line), err)
 			continue
@@ -74,10 +66,10 @@ func logDockerResponse(logger logrus.FieldLogger, dockerResponse io.ReadCloser,
 		}
 	}
 
-	return nil
+	return scanner.Err()
 }
 
-func writeLog(logger logrus.FieldLogger, isError bool, format string, args ...any) {
+func writeLog(logger *logging.Logger, isError bool, format string, args ...any) {
 	if isError {
 		logger.Errorf(format, args...)
 	} else {

act/container/docker_network.go

@@ -2,7 +2,7 @@
 // Copyright 2023 The nektos/act Authors. All rights reserved.
 // SPDX-License-Identifier: MIT
 
-//go:build !(WITHOUT_DOCKER || !(linux || darwin || windows || netbsd))
+//go:build !(WITHOUT_DOCKER || !(linux || darwin || windows || netbsd || freebsd))
 
 package container
 
@@ -10,21 +10,20 @@ import (
 	"context"
 	"errors"
 	"fmt"
+	"net/netip"
 	"strings"
 	"time"
 
 	"gitea.com/gitea/runner/act/common"
 
+	cerrdefs "github.com/containerd/errdefs"
+	"github.com/moby/moby/api/types/network"
 	"github.com/moby/moby/client"
 )
 
 const (
 	networkCreateAttempts   = 3
 	networkCreateRetryDelay = time.Second
-
-	// marks the networks a runner creates for its jobs, so it can tell its own leftovers from
-	// those of another runner sharing the daemon
-	runnerUUIDLabel = "com.gitea.runner.uuid"
 )
 
 // RemoveOrphanNetworks removes the networks this runner created for jobs whose teardown did
@@ -32,17 +31,17 @@ const (
 // had an endpoint on it at the time. Each one holds a subnet of the daemon's address pool
 // until it is removed. Networks created after createdBefore are left alone, so a job starting
 // while this runs cannot lose the network it has created but not yet attached a container to.
-func RemoveOrphanNetworks(ctx context.Context, runnerUUID string, createdBefore time.Time) error {
+func RemoveOrphanNetworks(ctx context.Context, runnerUUID, detach string, createdBefore time.Time) error {
 	cli, err := GetDockerClient(ctx)
 	if err != nil {
 		return fmt.Errorf("failed to connect to the docker daemon: %w", err)
 	}
 	defer cli.Close()
 
-	return removeOrphanNetworks(ctx, cli, runnerUUID, createdBefore)
+	return removeOrphanNetworks(ctx, cli, runnerUUID, detach, createdBefore)
 }
 
-func removeOrphanNetworks(ctx context.Context, cli client.APIClient, runnerUUID string, createdBefore time.Time) error {
+func removeOrphanNetworks(ctx context.Context, cli client.APIClient, runnerUUID, detach string, createdBefore time.Time) error {
 	networks, err := cli.NetworkList(ctx, client.NetworkListOptions{
 		Filters: make(client.Filters).Add("label", runnerUUIDLabel+"="+runnerUUID),
 	})
@@ -51,18 +50,32 @@ func removeOrphanNetworks(ctx context.Context, cli client.APIClient, runnerUUID
 	}
 
 	var errs []error
+networks:
 	for _, n := range networks.Items {
 		result, err := cli.NetworkInspect(ctx, n.ID, client.NetworkInspectOptions{})
-		if err != nil {
+		if cerrdefs.IsNotFound(err) {
+			continue
+		} else if err != nil {
 			errs = append(errs, fmt.Errorf("failed to inspect network %s: %w", n.Name, err))
 			continue
 		}
 		// the emptiness check, not the label, is what keeps a live job of another process
 		// sharing this registration safe
-		if len(result.Network.Containers) != 0 || result.Network.Created.After(createdBefore) {
+		if len(result.Network.Containers) > 1 || result.Network.Created.After(createdBefore) {
 			continue
 		}
-		if _, err := cli.NetworkRemove(ctx, n.ID, client.NetworkRemoveOptions{}); err != nil {
+		for containerID := range result.Network.Containers {
+			if detach == "" || !strings.HasPrefix(containerID, detach) {
+				continue networks
+			}
+			if err := disconnectNetwork(ctx, cli, n.ID, containerID); err != nil {
+				errs = append(errs, fmt.Errorf("failed to disconnect container from network %s: %w", n.Name, err))
+				continue networks
+			}
+		}
+		if _, err := cli.NetworkRemove(ctx, n.ID, client.NetworkRemoveOptions{}); cerrdefs.IsNotFound(err) {
+			continue
+		} else if err != nil {
 			errs = append(errs, fmt.Errorf("failed to remove network %s: %w", n.Name, err))
 			continue
 		}
@@ -72,51 +85,60 @@ func removeOrphanNetworks(ctx context.Context, cli client.APIClient, runnerUUID
 }
 
 func NewDockerNetworkCreateExecutor(name string, opts NewDockerNetworkCreateExecutorInput) common.Executor {
-	return func(ctx context.Context) error {
+	return common.Executor(func(ctx context.Context) error {
 		cli, err := GetDockerClient(ctx)
 		if err != nil {
 			return err
 		}
 		defer cli.Close()
+		return createDockerNetwork(ctx, cli, name, opts)
+	}).IfNot(common.Dryrun)
+}
 
-		// Only create the network if it doesn't exist
-		networks, err := cli.NetworkList(ctx, client.NetworkListOptions{})
-		if err != nil {
+func createDockerNetwork(ctx context.Context, cli client.APIClient, name string, opts NewDockerNetworkCreateExecutorInput) error {
+	// Only create the network if it doesn't exist
+	networks, err := cli.NetworkList(ctx, client.NetworkListOptions{})
+	if err != nil {
+		return err
+	}
+	var options map[string]string
+	// For Gitea, reduce log noise
+	// common.Logger(ctx).Debugf("%v", networks)
+	for _, n := range networks.Items {
+		if n.Name == name {
+			common.Logger(ctx).Debugf("Network %v exists", name)
+			return nil
+		}
+		// the daemon's mtu only reaches its default bridge, Docker's default is left out to keep default-network-opts
+		if mtu := n.Options["com.docker.network.driver.mtu"]; n.Name == network.NetworkBridge && mtu != "" && mtu != "1500" {
+			options = map[string]string{"com.docker.network.driver.mtu": mtu}
+		}
+	}
+
+	for i := range networkCreateAttempts {
+		if i > 0 {
+			common.Logger(ctx).Infof("Waiting for a free docker address pool to create network %s", name)
+			select {
+			case <-ctx.Done():
+				return ctx.Err()
+			case <-time.After(time.Duration(i) * networkCreateRetryDelay):
+			}
+		}
+		if _, err = cli.NetworkCreate(ctx, name, client.NetworkCreateOptions{
+			Driver:     "bridge",
+			Scope:      "local",
+			EnableIPv4: opts.EnableIPv4,
+			EnableIPv6: opts.EnableIPv6,
+			Options:    options,
+			Labels:     runnerLabels(opts.RunnerUUID),
+		}); err == nil {
+			return nil
+		}
+		if !isAddressPoolExhausted(err) {
 			return err
 		}
-		// For Gitea, reduce log noise
-		// common.Logger(ctx).Debugf("%v", networks)
-		for _, n := range networks.Items {
-			if n.Name == name {
-				common.Logger(ctx).Debugf("Network %v exists", name)
-				return nil
-			}
-		}
-
-		for i := range networkCreateAttempts {
-			if i > 0 {
-				common.Logger(ctx).Infof("Waiting for a free docker address pool to create network %s", name)
-				select {
-				case <-ctx.Done():
-					return ctx.Err()
-				case <-time.After(time.Duration(i) * networkCreateRetryDelay):
-				}
-			}
-			if _, err = cli.NetworkCreate(ctx, name, client.NetworkCreateOptions{
-				Driver:     "bridge",
-				Scope:      "local",
-				EnableIPv4: opts.EnableIPv4,
-				EnableIPv6: opts.EnableIPv6,
-				Labels:     runnerLabels(opts.RunnerUUID),
-			}); err == nil {
-				return nil
-			}
-			if !isAddressPoolExhausted(err) {
-				return err
-			}
-		}
-		return fmt.Errorf("docker has no address pool left for this job's network, lower runner.capacity or widen default-address-pools in the docker daemon config: %w", err)
 	}
+	return fmt.Errorf("docker has no address pool left for this job's network, lower runner.capacity or widen default-address-pools in the docker daemon config: %w", err)
 }
 
 func runnerLabels(runnerUUID string) map[string]string {
@@ -134,41 +156,130 @@ func isAddressPoolExhausted(err error) bool {
 		strings.Contains(msg, "could not find an available, non-overlapping IPv4 address pool among the defaults") // docker 24 and older
 }
 
-func NewDockerNetworkRemoveExecutor(name string) common.Executor {
-	return func(ctx context.Context) error {
+func NewDockerNetworkConnectExecutor(networkName, container string) common.Executor {
+	return common.Executor(func(ctx context.Context) error {
 		cli, err := GetDockerClient(ctx)
 		if err != nil {
 			return err
 		}
 		defer cli.Close()
+		if err := connectNetwork(ctx, cli, networkName, container); err != nil {
+			common.Logger(ctx).Warnf("cannot connect %s to network %s, so jobs on it cannot reach the cache: %v", container, networkName, err)
+		}
+		return nil
+	}).IfNot(common.Dryrun)
+}
 
-		// Make sure that all network of the specified name are removed
-		// cli.NetworkRemove refuses to remove a network if there are duplicates
-		networks, err := cli.NetworkList(ctx, client.NetworkListOptions{})
+func connectNetwork(ctx context.Context, cli client.APIClient, networkName, container string) error {
+	_, err := cli.NetworkConnect(ctx, networkName, client.NetworkConnectOptions{
+		Container:      container,
+		EndpointConfig: &network.EndpointSettings{Aliases: []string{container}},
+	})
+	if err != nil && (strings.Contains(err.Error(), "already exists in network") || strings.Contains(err.Error(), "already connected")) {
+		return nil
+	}
+	return err
+}
+
+func NewDockerNetworkDisconnectExecutor(networkName, container string) common.Executor {
+	return common.Executor(func(ctx context.Context) error {
+		cli, err := GetDockerClient(ctx)
 		if err != nil {
 			return err
 		}
-		// For Gitea, reduce log noise
-		// common.Logger(ctx).Debugf("%v", networks)
-		var errs []error
-		for _, n := range networks.Items {
-			if n.Name == name {
-				result, err := cli.NetworkInspect(ctx, n.ID, client.NetworkInspectOptions{})
-				if err != nil {
-					return err
-				}
+		defer cli.Close()
+		return disconnectNetwork(ctx, cli, networkName, container)
+	}).IfNot(common.Dryrun)
+}
 
-				// it holds a subnet out of the daemon's pool until something reclaims it
-				if len(result.Network.Containers) != 0 {
-					common.Logger(ctx).Warnf("Refusing to remove network %s because it still has active endpoints, the idle cleanup reclaims it once they are gone", name)
-					continue
-				}
-				if _, err = cli.NetworkRemove(ctx, n.ID, client.NetworkRemoveOptions{}); err != nil {
-					errs = append(errs, fmt.Errorf("failed to remove network %s: %w", name, err))
-				}
+func disconnectNetwork(ctx context.Context, cli client.APIClient, networkName, container string) error {
+	_, err := cli.NetworkDisconnect(ctx, networkName, client.NetworkDisconnectOptions{Container: container, Force: true})
+	if cerrdefs.IsNotFound(err) || (err != nil && strings.Contains(err.Error(), "is not connected")) {
+		return nil
+	}
+	return err
+}
+
+func NewDockerNetworkRemoveExecutor(name string) common.Executor {
+	return common.Executor(func(ctx context.Context) error {
+		cli, err := GetDockerClient(ctx)
+		if err != nil {
+			return err
+		}
+		defer cli.Close()
+		return removeNetwork(ctx, cli, name)
+	}).IfNot(common.Dryrun)
+}
+
+func removeNetwork(ctx context.Context, cli client.APIClient, name string) error {
+	networks, err := cli.NetworkList(ctx, client.NetworkListOptions{}) // NetworkRemove by name refuses duplicates, so remove each by ID
+	if err != nil {
+		return err
+	}
+	var errs []error
+	for _, n := range networks.Items {
+		if n.Name != name {
+			continue
+		}
+		result, err := cli.NetworkInspect(ctx, n.ID, client.NetworkInspectOptions{})
+		if cerrdefs.IsNotFound(err) {
+			continue
+		} else if err != nil {
+			return err
+		}
+		if len(result.Network.Containers) != 0 {
+			common.Logger(ctx).Warnf("Refusing to remove network %s because it still has active endpoints, the orphan cleanup reclaims it once they are gone", name)
+			continue
+		}
+		if _, err = cli.NetworkRemove(ctx, n.ID, client.NetworkRemoveOptions{}); err != nil && !cerrdefs.IsNotFound(err) {
+			errs = append(errs, fmt.Errorf("failed to remove network %s: %w", name, err))
+		}
+	}
+	return errors.Join(errs...)
+}
+
+// IsolatedCacheContainer returns the container holding addr, when jobs on jobNetwork cannot reach it there.
+func IsolatedCacheContainer(ctx context.Context, addr netip.Addr, jobNetwork string) (string, error) {
+	cli, err := GetDockerClient(ctx)
+	if err != nil {
+		return "", err
+	}
+	defer cli.Close()
+	return isolatedCacheContainer(ctx, cli, addr, jobNetwork)
+}
+
+func isolatedCacheContainer(ctx context.Context, cli client.APIClient, addr netip.Addr, jobNetwork string) (string, error) {
+	if jobNetwork == "host" || strings.HasPrefix(jobNetwork, "container:") {
+		return "", nil
+	}
+	containers, err := cli.ContainerList(ctx, client.ContainerListOptions{})
+	if err != nil {
+		return "", err
+	}
+	var holderID, holderContainer string
+	for _, summary := range containers.Items {
+		if summary.NetworkSettings == nil {
+			continue
+		}
+		for _, endpoint := range summary.NetworkSettings.Networks {
+			if endpoint != nil && (endpoint.IPAddress == addr || endpoint.GlobalIPv6Address == addr) {
+				holderID = endpoint.NetworkID
+				holderContainer = summary.ID[:12]
 			}
 		}
-
-		return errors.Join(errs...)
 	}
+	if holderID == "" {
+		return "", nil
+	}
+	holder, err := cli.NetworkInspect(ctx, holderID, client.NetworkInspectOptions{})
+	if err != nil || holder.Network.Driver != "bridge" {
+		return "", err
+	}
+	if jobNetwork != "" {
+		job, err := cli.NetworkInspect(ctx, jobNetwork, client.NetworkInspectOptions{})
+		if err != nil || job.Network.ID == holderID {
+			return "", err
+		}
+	}
+	return holderContainer, nil
 }

act/container/docker_network_test.go

@@ -6,27 +6,118 @@ package container
 import (
 	"context"
 	"errors"
+	"net/netip"
 	"testing"
 	"time"
 
 	cerrdefs "github.com/containerd/errdefs"
+	"github.com/moby/moby/api/types/container"
 	"github.com/moby/moby/api/types/network"
 	mobyclient "github.com/moby/moby/client"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 )
 
+func TestIsolatedCacheContainer(t *testing.T) {
+	ctx := t.Context()
+	cache, lan := netip.MustParseAddr("172.18.0.3"), netip.MustParseAddr("192.168.1.20")
+	client := &mockDockerClient{}
+	client.On("ContainerList", ctx, mobyclient.ContainerListOptions{}).Return(mobyclient.ContainerListResult{Items: []container.Summary{{}, {
+		ID: "0123456789abcdef",
+		NetworkSettings: &container.NetworkSettingsSummary{Networks: map[string]*network.EndpointSettings{
+			"compose": {NetworkID: "c0ffee", IPAddress: cache},
+			"lan":     {NetworkID: "beef", IPAddress: lan},
+		}},
+	}}}, nil)
+	for ref, inspected := range map[string]network.Network{
+		"c0ffee": {ID: "c0ffee", Name: "compose", Driver: "bridge"},
+		"beef":   {ID: "beef", Name: "lan", Driver: "macvlan"},
+		"c0f":    {ID: "c0ffee"},
+		"jobs":   {ID: "f00d"},
+	} {
+		client.On("NetworkInspect", ctx, ref, mobyclient.NetworkInspectOptions{}).
+			Return(mobyclient.NetworkInspectResult{Network: network.Inspect{Network: inspected}}, nil)
+	}
+	check := func(addr netip.Addr, jobNetwork, want string) {
+		got, err := isolatedCacheContainer(ctx, client, addr, jobNetwork)
+		require.NoError(t, err)
+		assert.Equal(t, want, got, jobNetwork)
+	}
+	check(cache, "", "0123456789ab")
+	check(cache, "jobs", "0123456789ab")
+	check(cache, "c0f", "")
+	check(cache, "host", "")
+	check(lan, "", "")
+	check(netip.MustParseAddr("10.0.0.5"), "", "")
+}
+
 func TestIsAddressPoolExhausted(t *testing.T) {
 	assert.True(t, isAddressPoolExhausted(cerrdefs.ErrInvalidArgument.WithMessage("Error response from daemon: all predefined address pools have been fully subnetted")))
 	assert.True(t, isAddressPoolExhausted(errors.New("could not find an available, non-overlapping IPv4 address pool among the defaults to assign to the network")))
 	assert.False(t, isAddressPoolExhausted(cerrdefs.ErrInvalidArgument.WithMessage("invalid subnet 10.0.0.0/8: it overlaps with an existing network")))
 }
 
-// Of this runner's networks, only the ones nothing is attached to and old enough to predate
-// any job now starting are the runner's to reclaim. An unexpected NetworkRemove fails the
-// test on its own, since testify has no expectation to match it against.
-func TestRemoveOrphanNetworks(t *testing.T) {
-	ctx := context.Background()
+func TestCreateDockerNetworkInheritsDaemonMTU(t *testing.T) {
+	ctx := t.Context()
+	for _, tc := range []struct {
+		bridgeOptions, want map[string]string
+	}{
+		{
+			map[string]string{"com.docker.network.bridge.host_binding_ipv4": "127.0.0.1", "com.docker.network.driver.mtu": "1450"},
+			map[string]string{"com.docker.network.driver.mtu": "1450"},
+		},
+		{map[string]string{"com.docker.network.driver.mtu": "1500"}, nil},
+	} {
+		client := &mockDockerClient{}
+		client.On("NetworkList", ctx, mobyclient.NetworkListOptions{}).
+			Return(mobyclient.NetworkListResult{Items: []network.Summary{{Name: network.NetworkBridge, Options: tc.bridgeOptions}}}, nil)
+		client.On("NetworkCreate", ctx, "job-network", mobyclient.NetworkCreateOptions{Driver: "bridge", Scope: "local", Options: tc.want}).
+			Return(mobyclient.NetworkCreateResult{}, nil)
+		require.NoError(t, createDockerNetwork(ctx, client, "job-network", NewDockerNetworkCreateExecutorInput{}))
+		client.AssertExpectations(t)
+	}
+}
+
+func (m *mockDockerClient) NetworkConnect(ctx context.Context, id string, opts mobyclient.NetworkConnectOptions) (mobyclient.NetworkConnectResult, error) {
+	return mobyclient.NetworkConnectResult{}, m.Called(ctx, id, opts).Error(0)
+}
+
+func (m *mockDockerClient) NetworkDisconnect(ctx context.Context, id string, opts mobyclient.NetworkDisconnectOptions) (mobyclient.NetworkDisconnectResult, error) {
+	return mobyclient.NetworkDisconnectResult{}, m.Called(ctx, id, opts).Error(0)
+}
+
+func TestConnectAndDisconnectNetwork(t *testing.T) {
+	ctx := t.Context()
+	connect := func(answer error) error {
+		client := &mockDockerClient{}
+		client.On("NetworkConnect", ctx, "jobs", mobyclient.NetworkConnectOptions{
+			Container:      "0123456789ab",
+			EndpointConfig: &network.EndpointSettings{Aliases: []string{"0123456789ab"}},
+		}).Return(answer).Once()
+		return connectNetwork(ctx, client, "jobs", "0123456789ab")
+	}
+	require.NoError(t, connect(nil))
+	require.NoError(t, connect(errors.New("endpoint with name runner already exists in network jobs")))
+	require.NoError(t, connect(errors.New("container runner already connected to network jobs")))
+	require.ErrorIs(t, connect(context.Canceled), context.Canceled)
+
+	disconnect := func(answer error) error {
+		client := &mockDockerClient{}
+		client.On("NetworkDisconnect", ctx, "jobs", mobyclient.NetworkDisconnectOptions{
+			Container: "0123456789ab", Force: true,
+		}).Return(answer).Once()
+		return disconnectNetwork(ctx, client, "jobs", "0123456789ab")
+	}
+	require.NoError(t, disconnect(cerrdefs.ErrNotFound))
+	require.NoError(t, disconnect(errors.New("container runner is not connected to the network jobs")))
+	require.ErrorIs(t, disconnect(context.Canceled), context.Canceled)
+}
+
+// Of this runner's networks, only the ones nothing but its own cache container is attached to
+// and old enough to predate any job now starting are the runner's to reclaim. An unexpected
+// NetworkRemove fails the test on its own, since testify has no expectation to match it against.
+func TestRemoveNetworks(t *testing.T) {
+	ctx := t.Context()
 	cutoff := time.Date(2026, time.April, 29, 20, 0, 0, 0, time.UTC)
 	client := &mockDockerClient{}
 	client.On("NetworkList", ctx, mobyclient.NetworkListOptions{
@@ -35,16 +126,46 @@ func TestRemoveOrphanNetworks(t *testing.T) {
 		{ID: "orphan"},
 		{ID: "busy"},
 		{ID: "starting"},
+		{ID: "cached"},
+		{ID: "shared"},
+		{ID: "gone"},
+		{ID: "raced"},
 	}}, nil)
 	client.On("NetworkInspect", ctx, "orphan", mobyclient.NetworkInspectOptions{}).
-		Return(mobyclient.NetworkInspectResult{}, nil)
+		Return(mobyclient.NetworkInspectResult{}, nil).Twice()
 	client.On("NetworkInspect", ctx, "busy", mobyclient.NetworkInspectOptions{}).
-		Return(mobyclient.NetworkInspectResult{Network: network.Inspect{Containers: map[string]network.EndpointResource{"c": {}}}}, nil)
+		Return(mobyclient.NetworkInspectResult{Network: network.Inspect{Containers: map[string]network.EndpointResource{"c": {}}}}, nil).Twice()
 	client.On("NetworkInspect", ctx, "starting", mobyclient.NetworkInspectOptions{}).
-		Return(mobyclient.NetworkInspectResult{Network: network.Inspect{Network: network.Network{Created: cutoff.Add(time.Second)}}}, nil)
+		Return(mobyclient.NetworkInspectResult{Network: network.Inspect{
+			Network:    network.Network{Created: cutoff.Add(time.Second)},
+			Containers: map[string]network.EndpointResource{"0123456789abcdef": {}},
+		}}, nil)
+	client.On("NetworkInspect", ctx, "cached", mobyclient.NetworkInspectOptions{}).
+		Return(mobyclient.NetworkInspectResult{Network: network.Inspect{Containers: map[string]network.EndpointResource{"0123456789abcdef": {}}}}, nil)
+	client.On("NetworkInspect", ctx, "shared", mobyclient.NetworkInspectOptions{}).
+		Return(mobyclient.NetworkInspectResult{Network: network.Inspect{Containers: map[string]network.EndpointResource{"0123456789abcdef": {}, "job": {}}}}, nil)
+	client.On("NetworkInspect", ctx, "gone", mobyclient.NetworkInspectOptions{}).
+		Return(mobyclient.NetworkInspectResult{}, cerrdefs.ErrNotFound).Twice()
+	client.On("NetworkInspect", ctx, "raced", mobyclient.NetworkInspectOptions{}).
+		Return(mobyclient.NetworkInspectResult{}, nil).Twice()
+	client.On("NetworkRemove", ctx, "raced", mobyclient.NetworkRemoveOptions{}).
+		Return(mobyclient.NetworkRemoveResult{}, cerrdefs.ErrNotFound).Twice()
 	client.On("NetworkRemove", ctx, "orphan", mobyclient.NetworkRemoveOptions{}).
-		Return(mobyclient.NetworkRemoveResult{}, nil)
+		Return(mobyclient.NetworkRemoveResult{}, nil).Twice()
+	client.On("NetworkDisconnect", ctx, "cached", mobyclient.NetworkDisconnectOptions{Container: "0123456789abcdef", Force: true}).
+		Return(nil).Once()
+	client.On("NetworkRemove", ctx, "cached", mobyclient.NetworkRemoveOptions{}).
+		Return(mobyclient.NetworkRemoveResult{}, nil).Once()
 
-	require.NoError(t, removeOrphanNetworks(ctx, client, "runner-1", cutoff))
+	require.NoError(t, removeOrphanNetworks(ctx, client, "runner-1", "0123456789ab", cutoff))
+
+	client.On("NetworkList", ctx, mobyclient.NetworkListOptions{}).Return(mobyclient.NetworkListResult{Items: []network.Summary{
+		{ID: "orphan", Name: "job"},
+		{ID: "busy", Name: "job"},
+		{ID: "gone", Name: "job"},
+		{ID: "raced", Name: "job"},
+		{ID: "shared", Name: "other"},
+	}}, nil)
+	require.NoError(t, removeNetwork(ctx, client, "job"))
 	client.AssertExpectations(t)
 }

act/container/docker_platform.go

@@ -2,7 +2,7 @@
 // Copyright 2025 The nektos/act Authors. All rights reserved.
 // SPDX-License-Identifier: MIT
 
-//go:build !(WITHOUT_DOCKER || !(linux || darwin || windows || netbsd))
+//go:build !(WITHOUT_DOCKER || !(linux || darwin || windows || netbsd || freebsd))
 
 package container
 

act/container/docker_platform_test.go

@@ -6,6 +6,7 @@ package container
 import (
 	"testing"
 
+	specs "github.com/opencontainers/image-spec/specs-go/v1"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 )
@@ -17,32 +18,17 @@ func TestParsePlatform(t *testing.T) {
 		assert.Nil(t, got)
 	})
 
-	t.Run("os/arch", func(t *testing.T) {
-		got, err := parsePlatform("linux/amd64")
-		require.NoError(t, err)
-		require.NotNil(t, got)
-		assert.Equal(t, "linux", got.OS)
-		assert.Equal(t, "amd64", got.Architecture)
-		assert.Empty(t, got.Variant)
-	})
-
-	t.Run("os/arch/variant", func(t *testing.T) {
-		got, err := parsePlatform("linux/arm/v7")
-		require.NoError(t, err)
-		require.NotNil(t, got)
-		assert.Equal(t, "linux", got.OS)
-		assert.Equal(t, "arm", got.Architecture)
-		assert.Equal(t, "v7", got.Variant)
-	})
-
-	t.Run("input is lowercased", func(t *testing.T) {
-		got, err := parsePlatform("Linux/AMD64/V8")
-		require.NoError(t, err)
-		require.NotNil(t, got)
-		assert.Equal(t, "linux", got.OS)
-		assert.Equal(t, "amd64", got.Architecture)
-		assert.Equal(t, "v8", got.Variant)
-	})
+	for input, want := range map[string]specs.Platform{
+		"linux/amd64":    {OS: "linux", Architecture: "amd64"},
+		"linux/arm/v7":   {OS: "linux", Architecture: "arm", Variant: "v7"},
+		"Linux/AMD64/V8": {OS: "linux", Architecture: "amd64", Variant: "v8"},
+	} {
+		t.Run(input, func(t *testing.T) {
+			got, err := parsePlatform(input)
+			require.NoError(t, err)
+			assert.Equal(t, &want, got)
+		})
+	}
 
 	for _, bad := range []string{
 		"amd64",
@@ -61,3 +47,26 @@ func TestParsePlatform(t *testing.T) {
 		})
 	}
 }
+
+func TestPlatformMatches(t *testing.T) {
+	for _, testcase := range []struct {
+		requested, image string
+		want             bool
+	}{
+		{"linux/amd64", "linux/amd64", true},
+		{"linux/amd64/v1", "linux/amd64", true},
+		{"linux/arm64", "linux/amd64", false},
+		{"linux/arm64/v8", "linux/arm64", true},
+		{"linux/arm/v7", "linux/arm/v7", true},
+		{"linux/arm", "linux/arm/v7", true},
+		{"linux/arm/v6", "linux/arm/v7", false},
+		{"linux/arm", "linux/arm/v6", true},
+		{"windows/arm/v7", "linux/arm/v7", false},
+	} {
+		requested, err := parsePlatform(testcase.requested)
+		require.NoError(t, err)
+		image, err := parsePlatform(testcase.image)
+		require.NoError(t, err)
+		assert.Equal(t, testcase.want, platformMatches(requested, image), "%s on %s", testcase.requested, testcase.image)
+	}
+}

act/container/docker_proxy.go

@@ -1,25 +1,29 @@
 // Copyright 2026 The Gitea Authors. All rights reserved.
 // SPDX-License-Identifier: MIT
 
-//go:build !(WITHOUT_DOCKER || !(linux || darwin || windows || netbsd))
+//go:build !(WITHOUT_DOCKER || !(linux || darwin || windows || netbsd || freebsd))
 
 package container
 
 import (
+	"bufio"
 	"bytes"
 	"context"
-	"crypto/sha256"
-	"encoding/hex"
 	"encoding/json"
 	"errors"
 	"fmt"
 	"io"
+	"maps"
+	"mime"
 	"net"
 	"net/http"
 	"net/http/httputil"
 	"os"
+	"path"
 	"path/filepath"
 	"regexp"
+	"runtime"
+	"slices"
 	"strings"
 	"sync"
 	"time"
@@ -33,91 +37,250 @@ import (
 )
 
 const (
-	jobLabel      = "com.gitea.runner.job"
+	jobLabel      = "com.gitea.runner.job."
 	maxCreateBody = 8 << 20
+
+	dockerProxyProbeTimeout       = 5 * time.Second
+	dockerProxyProbeWorkerTimeout = time.Minute
+	dockerProxyProbeTarget        = "/gitea-runner-probe"
 )
 
 var (
 	createPath    = regexp.MustCompile(`^(/v[0-9.]+)?/(containers|networks|volumes)/create$`)
 	rawStreamPath = regexp.MustCompile(`^(/v[0-9.]+)?/(containers/[^/]+/attach|exec/[^/]+/start)$`)
-	proxyProbe    struct {
-		sync.Mutex
-		decided bool
-		dir     string
-	}
 )
 
-// DockerProxyDir returns where job proxy sockets live, "" while undecided or when the daemon cannot open the runner's files.
-func DockerProxyDir(ctx context.Context) string {
-	proxyProbe.Lock()
-	defer proxyProbe.Unlock()
-	if proxyProbe.decided {
-		return proxyProbe.dir
-	}
-	dir := filepath.Join(os.TempDir(), "gitea-runner-docker")
-	ok, err := daemonSeesDir(ctx, dir)
-	if err != nil {
-		common.Logger(ctx).Debugf("docker proxy probe postponed: %v", err)
-		return ""
-	}
-	proxyProbe.decided = true
-	if ok {
-		proxyProbe.dir = dir
-	} else {
-		common.Logger(ctx).Infof("the docker daemon cannot reach the runner's filesystem, jobs get the daemon socket directly")
-	}
-	return proxyProbe.dir
+var dockerProxyProbes sync.Map
+
+type dockerProxyDirectory struct {
+	dir, daemonDir string
+	socket         os.FileInfo
 }
 
-func daemonSeesDir(ctx context.Context, dir string) (bool, error) {
-	if err := os.MkdirAll(dir, 0o700); err != nil {
-		return false, err
+type dockerProxyProbe struct {
+	directory dockerProxyDirectory
+	done      chan struct{}
+	seen      bool
+	err       error
+}
+
+func NewDockerProxy(ctx context.Context, job string) *DockerProxy {
+	if host := os.Getenv("DOCKER_HOST"); runtime.GOOS != "linux" || host != "" && !strings.HasPrefix(host, "unix://") {
+		return nil
 	}
-	probe := filepath.Join(dir, "probe")
-	if err := os.WriteFile(probe, nil, 0o600); err != nil {
-		return false, err
+	probeCtx, cancel := context.WithTimeout(ctx, dockerProxyProbeTimeout)
+	defer cancel()
+	cli, err := client.New(client.FromEnv) // negotiates on first request, so a cached probe costs no round trip
+	if err != nil {
+		return nil
 	}
-	cli, err := GetDockerClient(ctx)
+	defer cli.Close()
+	daemonSocket, ok := strings.CutPrefix(cli.DaemonHost(), "unix://")
+	if !ok {
+		return nil
+	}
+	socket, err := os.Stat(daemonSocket)
+	if err != nil || socket.Mode()&os.ModeSocket == 0 {
+		return nil
+	}
+	workdir, _ := os.Getwd()
+	key := [3]string{cli.DaemonHost(), workdir, os.TempDir()}
+	probe, err := probeDockerProxyDirectory(probeCtx, cli, key, socket)
+	if err != nil {
+		common.Logger(ctx).Infof("docker proxy probe failed, jobs get the daemon socket directly: %v", err)
+		return nil
+	}
+	if !probe.seen {
+		common.Logger(ctx).Infof("the docker daemon cannot reach the runner's temporary or working directory, jobs get the daemon socket directly")
+		return nil
+	}
+	if ctx.Err() != nil {
+		return nil
+	}
+	proxy, err := StartDockerProxy(daemonSocket, probe.directory.dir, job)
+	if err != nil {
+		dockerProxyProbes.CompareAndDelete(key, probe)
+		common.Logger(ctx).Warnf("docker proxy not started, the job gets the daemon socket directly: %v", err)
+		return nil
+	}
+	proxy.Socket = probe.directory.daemonDir + strings.TrimPrefix(proxy.Socket, probe.directory.dir)
+	return proxy
+}
+
+func probeDockerProxyDirectory(ctx context.Context, cli client.APIClient, key [3]string, socket os.FileInfo) (*dockerProxyProbe, error) {
+	for {
+		probe := &dockerProxyProbe{directory: dockerProxyDirectory{socket: socket}, done: make(chan struct{})}
+		actual, loaded := dockerProxyProbes.LoadOrStore(key, probe)
+		if loaded {
+			probe, _ = actual.(*dockerProxyProbe)
+			if !os.SameFile(probe.directory.socket, socket) { // daemon replacement invalidates cached paths
+				dockerProxyProbes.CompareAndDelete(key, probe)
+				continue
+			}
+		} else {
+			go func() { // outlives callers' deadlines so a slow daemon still gets its result cached
+				defer cli.Close()
+				ctx, cancel := context.WithTimeout(context.Background(), dockerProxyProbeWorkerTimeout)
+				defer cancel()
+				probe.directory.dir, probe.directory.daemonDir = runnerContainerWorkdir(ctx, cli)
+				probe.seen = probe.directory.daemonDir != ""
+				if !probe.seen {
+					if probe.directory.dir, probe.err = filepath.Abs(key[2]); probe.err == nil {
+						probe.directory.daemonDir = probe.directory.dir
+						probe.seen, probe.err = daemonSeesDir(ctx, cli, probe.directory.dir, probe.directory.daemonDir)
+					}
+				}
+				if probe.seen {
+					dockerProxyProbes.LoadOrStore(key, probe)
+				} else {
+					dockerProxyProbes.CompareAndDelete(key, probe)
+				}
+				close(probe.done)
+				removeStaleProbeContainers(cli)
+			}()
+		}
+		select {
+		case <-ctx.Done():
+			return &dockerProxyProbe{}, ctx.Err()
+		case <-probe.done:
+		}
+		if ctx.Err() == nil && errors.Is(probe.err, context.DeadlineExceeded) {
+			continue
+		}
+		return probe, probe.err
+	}
+}
+
+// runnerContainerWorkdir looks the runner's container up by hostname to find the daemon's path to its working directory.
+func runnerContainerWorkdir(ctx context.Context, cli client.APIClient) (workdir, daemonDir string) {
+	workdir, err := os.Getwd()
+	hostname, hostnameErr := os.Hostname()
+	if err != nil || hostnameErr != nil {
+		return "", ""
+	}
+	self, err := cli.ContainerInspect(ctx, hostname, client.ContainerInspectOptions{})
+	if err != nil {
+		return "", ""
+	}
+	if daemonDir = containerInfoFromInspect(self.Container).DaemonPath(workdir); daemonDir == "" {
+		return "", ""
+	}
+	if seen, _ := containerSeesMarker(ctx, cli, workdir, self.Container.ID, workdir); !seen { // the hostname may name another container
+		return "", ""
+	}
+	return workdir, daemonDir
+}
+
+func containerSeesMarker(ctx context.Context, cli client.APIClient, dir, id, containerDir string) (bool, error) {
+	marker, err := os.CreateTemp(dir, "gitea-runner-probe-")
 	if err != nil {
 		return false, err
 	}
-	defer cli.Close()
+	defer func() {
+		if err := os.Remove(marker.Name()); err != nil {
+			common.Logger(ctx).Warnf("removing the docker proxy probe marker failed: %v", err)
+		}
+	}()
+	if err := marker.Close(); err != nil {
+		return false, err
+	}
+	_, err = cli.ContainerStatPath(ctx, id, client.ContainerStatPathOptions{Path: path.Join(containerDir, filepath.Base(marker.Name()))})
+	if cerrdefs.IsNotFound(err) {
+		return false, nil
+	}
+	return err == nil, err
+}
+
+// daemonSeesDir reports whether the daemon opens the files the runner writes in dir by their path in daemonDir,
+// which is what a job's proxy socket mounted from there needs.
+func daemonSeesDir(ctx context.Context, cli client.APIClient, dir, daemonDir string) (bool, error) {
 	images, err := cli.ImageList(ctx, client.ImageListOptions{})
 	if err != nil {
 		return false, err
 	}
 	if len(images.Items) == 0 {
-		return false, errors.New("no image to probe with yet")
+		return false, errors.New("no image available for the docker proxy probe")
+	}
+	var created client.ContainerCreateResult
+	for _, image := range images.Items {
+		created, err = cli.ContainerCreate(ctx, client.ContainerCreateOptions{
+			Config: &container.Config{Image: image.ID, Cmd: []string{"true"}},
+			HostConfig: &container.HostConfig{Mounts: []mount.Mount{
+				{Type: mount.TypeBind, Source: daemonDir, Target: dockerProxyProbeTarget, ReadOnly: true}, // not the marker itself, podman creates a missing bind source where docker rejects it
+			}},
+		})
+		if !cerrdefs.IsNotFound(err) {
+			break
+		}
 	}
-	// creating validates that a bind source exists on the daemon's side, nothing is started
-	created, err := cli.ContainerCreate(ctx, client.ContainerCreateOptions{
-		Config:     &container.Config{Image: images.Items[0].ID, Cmd: []string{"true"}},
-		HostConfig: &container.HostConfig{Mounts: []mount.Mount{{Type: mount.TypeBind, Source: probe, Target: "/gitea-runner-probe"}}},
-	})
 	if cerrdefs.IsInvalidArgument(err) {
 		return false, nil
 	}
 	if err != nil {
 		return false, err
 	}
-	_, err = cli.ContainerRemove(ctx, created.ID, client.ContainerRemoveOptions{Force: true})
-	return true, err
+	seen, err := containerSeesMarker(ctx, cli, dir, created.ID, dockerProxyProbeTarget)
+	cleanupCtx, cancel := context.WithTimeout(context.WithoutCancel(ctx), dockerProxyProbeTimeout)
+	defer cancel()
+	if _, removeErr := cli.ContainerRemove(cleanupCtx, created.ID, client.ContainerRemoveOptions{Force: true, RemoveVolumes: true}); removeErr != nil {
+		return false, fmt.Errorf("removing the docker proxy probe container failed: %w", removeErr)
+	}
+	return seen, err
+}
+
+// removeStaleProbeContainers removes probe containers left by abandoned creates once any probe in flight when listed has ended.
+func removeStaleProbeContainers(cli client.APIClient) {
+	ctx, cancel := context.WithTimeout(context.Background(), dockerProxyProbeTimeout)
+	defer cancel()
+	listed, err := cli.ContainerList(ctx, client.ContainerListOptions{
+		All:     true,
+		Filters: make(client.Filters).Add("status", string(container.StateCreated)).Add("volume", dockerProxyProbeTarget),
+	})
+	if err != nil {
+		common.Logger(ctx).Warnf("listing stale docker proxy probe containers failed: %v", err)
+		return
+	}
+	listed.Items = slices.DeleteFunc(listed.Items, func(stale container.Summary) bool {
+		return stale.State != container.StateCreated || !slices.ContainsFunc(stale.Mounts, func(mountPoint container.MountPoint) bool {
+			return mountPoint.Type == mount.TypeBind && !mountPoint.RW && mountPoint.Destination == dockerProxyProbeTarget
+		})
+	})
+	if len(listed.Items) == 0 {
+		return
+	}
+	time.Sleep(dockerProxyProbeWorkerTimeout + dockerProxyProbeTimeout)
+	for _, stale := range listed.Items {
+		ctx, cancel := context.WithTimeout(context.Background(), dockerProxyProbeTimeout)
+		if err := (&containerReference{cli: cli, id: stale.ID}).remove()(ctx); err != nil {
+			common.Logger(ctx).Warnf("removing stale docker proxy probe container failed: %v", err)
+		}
+		cancel()
+	}
 }
 
 // StartDockerProxy serves a job's docker socket in dir, labelling what the job creates through it.
 func StartDockerProxy(daemonSocket, dir, job string) (*DockerProxy, error) {
-	if err := os.MkdirAll(dir, 0o700); err != nil {
-		return nil, err
-	}
-	digest := sha256.Sum256([]byte(job))
-	socket := filepath.Join(dir, hex.EncodeToString(digest[:8])+".sock")
-	_ = os.Remove(socket)
-	listener, err := net.Listen("unix", socket)
+	info, err := os.Stat(daemonSocket)
 	if err != nil {
 		return nil, err
 	}
-	if info, err := os.Stat(daemonSocket); err == nil {
-		_ = os.Chmod(socket, info.Mode().Perm())
+	if info.Mode()&os.ModeSocket == 0 {
+		return nil, errors.New("docker daemon path is not a Unix socket")
+	}
+	if err := os.MkdirAll(dir, 0o700); err != nil {
+		return nil, err
+	}
+	instance, err := os.MkdirTemp(dir, "p-")
+	if err != nil {
+		return nil, err
+	}
+	socket := filepath.Join(instance, "docker.sock")
+	listener, err := net.Listen("unix", socket)
+	if err != nil {
+		return nil, errors.Join(err, os.RemoveAll(instance))
+	}
+	if err := copyDockerSocketPermissions(daemonSocket, socket, info); err != nil {
+		return nil, errors.Join(err, listener.Close(), os.RemoveAll(instance))
 	}
 	dial := func(ctx context.Context, _, _ string) (net.Conn, error) {
 		return (&net.Dialer{}).DialContext(ctx, "unix", daemonSocket)
@@ -130,61 +293,110 @@ func StartDockerProxy(daemonSocket, dir, job string) (*DockerProxy, error) {
 		},
 		Transport: transport,
 	}
-	server := &http.Server{ReadHeaderTimeout: 30 * time.Second, Handler: http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-		switch {
-		case r.Method != http.MethodPost:
-		case createPath.MatchString(r.URL.Path):
-			if err := addLabel(r, job); err != nil {
-				http.Error(w, err.Error(), http.StatusBadRequest)
+	proxy := &DockerProxy{Socket: socket}
+	streams, cancelStreams := context.WithCancel(context.Background())
+	creates, cancelCreates := context.WithCancel(context.Background())
+	var admission sync.Mutex
+	var handlers sync.WaitGroup
+	server := &http.Server{ReadHeaderTimeout: 30 * time.Second, ConnContext: func(ctx context.Context, conn net.Conn) context.Context {
+		return context.WithValue(ctx, dockerProxyConnKey{}, conn)
+	}, Handler: http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		admission.Lock()
+		if streams.Err() != nil {
+			admission.Unlock()
+			http.Error(w, "docker proxy is closing", http.StatusServiceUnavailable)
+			return
+		}
+		handlers.Add(1)
+		admission.Unlock()
+		defer handlers.Done()
+		creating := r.Method == http.MethodPost && createPath.MatchString(r.URL.Path)
+		parent, lifetime := r.Context(), streams
+		if creating {
+			parent, lifetime = context.WithoutCancel(parent), creates
+		}
+		ctx, cancel := context.WithCancel(parent)
+		defer cancel()
+		stop := context.AfterFunc(lifetime, func() {
+			cancel()
+			if !creating {
+				if conn, ok := parent.Value(dockerProxyConnKey{}).(net.Conn); ok {
+					_ = conn.Close()
+				}
+			}
+		})
+		defer stop()
+		r = r.WithContext(ctx)
+		if creating {
+			r.Body = http.MaxBytesReader(w, r.Body, maxCreateBody)
+			mounts, _ := proxy.mounts.Load().(map[string]string)
+			if err := rewriteCreate(r, job, mounts); err != nil {
+				status := http.StatusBadRequest
+				if _, ok := errors.AsType[*http.MaxBytesError](err); ok {
+					status = http.StatusRequestEntityTooLarge
+				}
+				http.Error(w, err.Error(), status)
 				return
 			}
-		case rawStreamPath.MatchString(r.URL.Path):
-			tunnel(w, r, dial)
+		} else if r.Method == http.MethodPost && rawStreamPath.MatchString(r.URL.Path) {
+			tunnel(w, r, dial, forward)
 			return
 		}
 		forward.ServeHTTP(w, r)
 	})}
-	go func() { _ = server.Serve(listener) }()
-	return &DockerProxy{Socket: socket, close: func(ctx context.Context) error {
-		err := removeJobResources(ctx, job)
-		_ = server.Close()
+	served := make(chan struct{})
+	go func() {
+		defer close(served)
+		_ = server.Serve(listener)
+	}()
+	proxy.close = func(ctx context.Context) error {
+		ctx, cancel := context.WithTimeout(ctx, 30*time.Second)
+		defer cancel()
+		admission.Lock()
+		listenerErr := listener.Close()
+		cancelStreams()
+		admission.Unlock()
+		<-served
+		shutdownErr := server.Shutdown(ctx)
+		cancelCreates()
+		serverErr := server.Close()
+		handlers.Wait()
 		transport.CloseIdleConnections()
-		_ = os.Remove(socket)
-		return err
-	}}, nil
+		return errors.Join(ctx.Err(), listenerErr, shutdownErr, serverErr, os.RemoveAll(instance))
+	}
+	return proxy, nil
 }
 
-func addLabel(r *http.Request, job string) error {
-	body, err := io.ReadAll(io.LimitReader(r.Body, maxCreateBody+1))
+func rewriteCreate(r *http.Request, job string, mounts map[string]string) error {
+	body, err := io.ReadAll(r.Body)
 	if err != nil {
 		return err
 	}
-	if len(body) > maxCreateBody {
-		return errors.New("create request too large")
-	}
 	if len(bytes.TrimSpace(body)) == 0 {
-		r.Body = io.NopCloser(bytes.NewReader(body))
-		return nil
+		body = []byte("{}")
 	}
 	var fields map[string]json.RawMessage
+	var config struct{ Labels map[string]string }
 	if err := json.Unmarshal(body, &fields); err != nil {
 		return fmt.Errorf("invalid create request: %w", err)
 	}
-	key := "Labels"
-	for name := range fields {
-		if strings.EqualFold(name, key) {
-			key = name
-			break
-		}
+	if err := json.Unmarshal(body, &config); err != nil {
+		return fmt.Errorf("invalid create labels: %w", err)
 	}
-	labels := map[string]string{}
-	if raw := fields[key]; len(raw) > 0 && string(raw) != "null" {
-		if err := json.Unmarshal(raw, &labels); err != nil {
-			return fmt.Errorf("invalid create request: %w", err)
-		}
+	if fields == nil {
+		fields = make(map[string]json.RawMessage)
 	}
-	labels[jobLabel] = job
-	if fields[key], err = json.Marshal(labels); err != nil {
+	if len(mounts) > 0 && !hasAmbiguousFields(body) {
+		translateBinds(fields, createPath.FindStringSubmatch(r.URL.Path)[2], mounts)
+	}
+	maps.DeleteFunc(fields, func(name string, _ json.RawMessage) bool {
+		return strings.EqualFold(name, "Labels")
+	})
+	if config.Labels == nil {
+		config.Labels = make(map[string]string)
+	}
+	config.Labels[jobLabel+job] = "" // per-job key, so nested proxies keep each other's
+	if fields["Labels"], err = json.Marshal(config.Labels); err != nil {
 		return err
 	}
 	if body, err = json.Marshal(fields); err != nil {
@@ -196,44 +408,241 @@ func addLabel(r *http.Request, job string) error {
 	return nil
 }
 
-// tunnel splices attach and exec streams, which the daemon hijacks with or without an HTTP upgrade
-func tunnel(w http.ResponseWriter, r *http.Request, dial func(context.Context, string, string) (net.Conn, error)) {
-	hijacker, ok := w.(http.Hijacker)
-	if !ok {
-		http.Error(w, "connection cannot be hijacked", http.StatusInternalServerError)
-		return
+func translateBinds(fields map[string]json.RawMessage, kind string, mounts map[string]string) {
+	cleanedSource := func(source string) string {
+		cleaned := path.Clean(source)
+		if target := jobMount(cleaned, mounts); mounts[target] != "" {
+			return mounts[target] + cleaned[len(target):]
+		}
+		return source
 	}
+	spelledSource := func(source string) string { // dockerd checks these as spelled
+		target := jobMount(path.Clean(source), mounts)
+		if rest, spelled := strings.CutPrefix(source, target); mounts[target] != "" && spelled && (rest == "" || rest[0] == '/') && filepath.IsLocal("."+rest) {
+			return mounts[target] + rest
+		}
+		return cleanedSource(source)
+	}
+	switch kind {
+	case "volumes":
+		var driver string
+		var options map[string]any
+		decodeField(fields, "Driver", &driver)
+		if key := decodeField(fields, "DriverOpts", &options); options != nil {
+			translateDevice(driver, options, spelledSource)
+			if encoded, err := json.Marshal(options); err == nil {
+				fields[key] = encoded
+			}
+		}
+	case "containers":
+		var hostConfig map[string]any
+		key := decodeField(fields, "HostConfig", &hostConfig)
+		binds, _ := field(hostConfig, "Binds").([]any)
+		for i, bind := range binds {
+			bind, _ := bind.(string)
+			source, target, _ := strings.Cut(bind, ":")
+			if translated := cleanedSource(source); strings.HasPrefix(target, "/") && !strings.Contains(translated, ":") {
+				binds[i] = translated + ":" + target
+			}
+		}
+		specs, _ := field(hostConfig, "Mounts").([]any)
+		for _, spec := range specs {
+			spec, _ := spec.(map[string]any)
+			switch field(spec, "Type") {
+			case "bind":
+				if source, ok := field(spec, "Source").(string); ok {
+					spec["Source"] = spelledSource(source)
+				}
+			case "volume":
+				volumeOptions, _ := field(spec, "VolumeOptions").(map[string]any)
+				driverConfig, _ := field(volumeOptions, "DriverConfig").(map[string]any)
+				translateDevice(field(driverConfig, "Name"), field(driverConfig, "Options"), spelledSource)
+			}
+		}
+		if encoded, err := json.Marshal(hostConfig); err == nil && hostConfig != nil {
+			fields[key] = encoded
+		}
+	}
+}
+
+func decodeField(fields map[string]json.RawMessage, name string, value any) string {
+	for key, raw := range fields {
+		if strings.EqualFold(key, name) {
+			decoder := json.NewDecoder(bytes.NewReader(raw))
+			decoder.UseNumber()
+			_ = decoder.Decode(value) // wrong types stay unset for dockerd to reject
+			return key
+		}
+	}
+	return ""
+}
+
+func translateDevice(driver, options any, translate func(string) string) {
+	optionMap, _ := options.(map[string]any)
+	device, ok := optionMap["device"].(string)
+	flags, _ := optionMap["o"].(string)
+	tokens := strings.Split(flags, ",")
+	local := driver == nil || driver == "" || driver == "local"
+	if ok && local && (slices.Contains(tokens, "bind") || slices.Contains(tokens, "rbind")) && !slices.Contains(tokens, "remount") {
+		optionMap["device"] = translate(device)
+	}
+}
+
+// field also renames the matched key to name.
+func field(object map[string]any, name string) any {
+	for key, value := range object {
+		if strings.EqualFold(key, name) {
+			delete(object, key)
+			object[name] = value
+			return value
+		}
+	}
+	return nil
+}
+
+var (
+	requestFields = []string{"hostconfig", "driver", "driveropts"}
+	asciiFolds    = strings.NewReplacer("ſ", "s", "K", "k") // the non-ASCII runes strings.EqualFold matches to ASCII letters
+)
+
+// dockerd settles repeated names by order, which re-encoding loses.
+func hasAmbiguousFields(body []byte) bool {
+	type frame struct {
+		names     map[string]bool
+		key       string
+		expectKey bool
+		nested    bool
+	}
+	decoder := json.NewDecoder(bytes.NewReader(body))
+	decoder.UseNumber()
+	stack := []*frame{{}}
+	for {
+		token, err := decoder.Token()
+		if err != nil {
+			return !errors.Is(err, io.EOF)
+		}
+		top := stack[len(stack)-1]
+		if name, ok := token.(string); ok && top.expectKey {
+			top.key, top.expectKey = strings.ToLower(asciiFolds.Replace(name)), false
+			if top.names[top.key] && (top.nested || slices.Contains(requestFields, top.key)) {
+				return true
+			}
+			top.names[top.key] = true
+			continue
+		}
+		top.expectKey = top.names != nil
+		nested := top.nested || len(stack) == 2 && slices.Contains(requestFields, top.key)
+		switch token {
+		case json.Delim('{'):
+			stack = append(stack, &frame{names: map[string]bool{}, expectKey: true, nested: nested})
+		case json.Delim('['):
+			stack = append(stack, &frame{nested: nested})
+		case json.Delim('}'), json.Delim(']'):
+			stack = stack[:len(stack)-1]
+		}
+	}
+}
+
+// jobMount returns "" also for a path already naming a daemon source.
+func jobMount(source string, mounts map[string]string) string {
+	target := ""
+	for destination, daemonSource := range mounts {
+		if daemonSource != "" && (source == daemonSource || strings.HasPrefix(source, daemonSource+"/")) {
+			return ""
+		}
+		if len(destination) > len(target) && (source == destination || strings.HasPrefix(source, destination+"/")) {
+			target = destination
+		}
+	}
+	return target
+}
+
+type dockerProxyConnKey struct{}
+
+type dockerProxyResponse struct {
+	response *http.Response
+}
+
+func (r dockerProxyResponse) RoundTrip(_ *http.Request) (*http.Response, error) {
+	return r.response, nil
+}
+
+// tunnel splices attach and exec streams, which the daemon hijacks with or without an HTTP upgrade
+func tunnel(w http.ResponseWriter, r *http.Request, dial func(context.Context, string, string) (net.Conn, error), forward *httputil.ReverseProxy) {
 	upstream, err := dial(r.Context(), "", "")
 	if err != nil {
 		http.Error(w, err.Error(), http.StatusBadGateway)
 		return
 	}
 	defer upstream.Close()
+	stop := context.AfterFunc(r.Context(), func() { _ = upstream.Close() })
+	defer stop()
 	if err := r.Write(upstream); err != nil {
 		http.Error(w, err.Error(), http.StatusBadGateway)
 		return
 	}
-	downstream, buffered, err := hijacker.Hijack()
+	reader := bufio.NewReader(upstream)
+	var response *http.Response
+	for {
+		response, err = http.ReadResponse(reader, r)
+		if err != nil {
+			http.Error(w, err.Error(), http.StatusBadGateway)
+			return
+		}
+		if response.StatusCode >= 200 || response.StatusCode == http.StatusSwitchingProtocols {
+			break
+		}
+		maps.Copy(w.Header(), response.Header)
+		w.WriteHeader(response.StatusCode)
+		clear(w.Header())
+		_ = response.Body.Close()
+	}
+	defer func() {
+		_ = upstream.Close()
+		_ = response.Body.Close()
+	}()
+	mediaType, _, _ := mime.ParseMediaType(response.Header.Get("Content-Type"))
+	if response.StatusCode != http.StatusSwitchingProtocols && (response.StatusCode != http.StatusOK || mediaType != "application/vnd.docker.raw-stream") {
+		ordinary := *forward
+		ordinary.Transport = dockerProxyResponse{response: response}
+		ordinary.ServeHTTP(w, r)
+		return
+	}
+	downstream, buffered, err := http.NewResponseController(w).Hijack()
 	if err != nil {
 		return
 	}
 	defer downstream.Close()
-	if _, err := io.CopyN(upstream, buffered, int64(buffered.Reader.Buffered())); err != nil {
+	if _, err := fmt.Fprintf(buffered, "%s %s\r\n", response.Proto, response.Status); err != nil {
 		return
 	}
-	done := make(chan struct{}, 2)
+	if err := response.Header.Write(buffered); err != nil {
+		return
+	}
+	if _, err := buffered.WriteString("\r\n"); err != nil {
+		return
+	}
+	if err := buffered.Flush(); err != nil {
+		return
+	}
+	done := make(chan struct{})
 	go func() {
-		_, _ = io.Copy(upstream, downstream)
-		done <- struct{}{}
-	}()
-	go func() {
-		_, _ = io.Copy(downstream, upstream)
-		done <- struct{}{}
+		defer close(done)
+		if _, err := io.Copy(upstream, io.MultiReader(io.LimitReader(buffered, int64(buffered.Reader.Buffered())), downstream)); err != nil { // Bypass net/http after the prefix so stdin EOF preserves output.
+			_ = upstream.Close()
+		} else if writer, ok := upstream.(interface{ CloseWrite() error }); ok {
+			_ = writer.CloseWrite()
+		} else {
+			_ = upstream.Close()
+		}
 	}()
+	_, _ = io.Copy(downstream, reader)
+	_ = downstream.Close()
+	_ = upstream.Close()
 	<-done
 }
 
-func removeJobResources(ctx context.Context, job string) error {
+func RemoveDockerJobResources(ctx context.Context, job string) error {
 	cli, err := GetDockerClient(ctx)
 	if err != nil {
 		return err
@@ -244,29 +653,24 @@ func removeJobResources(ctx context.Context, job string) error {
 
 func removeLabelled(ctx context.Context, cli client.APIClient, job string) error {
 	logger := common.Logger(ctx)
-	filters := make(client.Filters).Add("label", jobLabel+"="+job)
+	filters := make(client.Filters).Add("label", jobLabel+job)
 	containers, err := cli.ContainerList(ctx, client.ContainerListOptions{All: true, Filters: filters})
-	if err != nil {
-		return err
-	}
-	var errs []error
+	errs := []error{err}
 	for _, c := range containers.Items {
 		logger.Infof("removing container %s the job left behind", strings.TrimPrefix(strings.Join(c.Names, ","), "/"))
 		errs = append(errs, (&containerReference{cli: cli, id: c.ID}).remove()(ctx))
 	}
 	networks, err := cli.NetworkList(ctx, client.NetworkListOptions{Filters: filters})
-	if err != nil {
-		return errors.Join(append(errs, err)...)
-	}
+	errs = append(errs, err)
 	for _, n := range networks.Items {
-		if _, err := cli.NetworkRemove(ctx, n.ID, client.NetworkRemoveOptions{}); err != nil && !cerrdefs.IsNotFound(err) {
+		if _, err := cli.NetworkRemove(ctx, n.ID, client.NetworkRemoveOptions{}); n.Scope == "swarm" && cerrdefs.IsInvalidArgument(err) { // swarm refuses while a service or its tasks use it
+			logger.Infof("keeping network %s, a swarm service still uses it", n.Name)
+		} else if err != nil && !cerrdefs.IsNotFound(err) {
 			errs = append(errs, fmt.Errorf("failed to remove network %s: %w", n.Name, err))
 		}
 	}
 	volumes, err := cli.VolumeList(ctx, client.VolumeListOptions{Filters: filters})
-	if err != nil {
-		return errors.Join(append(errs, err)...)
-	}
+	errs = append(errs, err)
 	for _, v := range volumes.Items {
 		if _, err := cli.VolumeRemove(ctx, v.Name, client.VolumeRemoveOptions{}); err != nil && !cerrdefs.IsNotFound(err) {
 			errs = append(errs, fmt.Errorf("failed to remove volume %s: %w", v.Name, err))

act/container/docker_proxy_test.go

@@ -1,7 +1,7 @@
 // Copyright 2026 The Gitea Authors. All rights reserved.
 // SPDX-License-Identifier: MIT
 
-//go:build !(WITHOUT_DOCKER || !(linux || darwin || windows || netbsd))
+//go:build !(WITHOUT_DOCKER || !(linux || darwin || windows || netbsd || freebsd))
 
 package container
 
@@ -10,17 +10,25 @@ import (
 	"bufio"
 	"bytes"
 	"context"
-	"encoding/json"
+	"errors"
+	"fmt"
 	"io"
 	"net"
 	"net/http"
+	"os"
 	"path/filepath"
+	"runtime"
+	"strconv"
 	"strings"
+	"sync/atomic"
 	"testing"
+	"testing/synctest"
 	"time"
 
 	cerrdefs "github.com/containerd/errdefs"
 	"github.com/moby/moby/api/types/container"
+	"github.com/moby/moby/api/types/image"
+	"github.com/moby/moby/api/types/mount"
 	"github.com/moby/moby/api/types/network"
 	"github.com/moby/moby/api/types/volume"
 	mobyclient "github.com/moby/moby/client"
@@ -56,7 +64,13 @@ func daemonSocketPath(t testing.TB, cli mobyclient.APIClient) string {
 }
 
 func TestDockerProxy(t *testing.T) {
+	if runtime.GOOS == "windows" {
+		t.Skip("Unix socket ownership is unavailable on Windows")
+	}
 	bodies := make(chan []byte, 8)
+	createStarted, releaseCreate := make(chan struct{}), make(chan struct{})
+	streamsDone := make(chan struct{}, 2)
+	var probes atomic.Int32
 	daemonSocket := filepath.Join(shortTempDir(t), "d.sock")
 	listener, err := net.Listen("unix", daemonSocket)
 	require.NoError(t, err)
@@ -64,16 +78,51 @@ func TestDockerProxy(t *testing.T) {
 		switch {
 		case strings.HasSuffix(r.URL.Path, "/create"):
 			body, _ := io.ReadAll(r.Body)
+			if bytes.Contains(body, []byte(`"Image":"probe-image"`)) {
+				_, _ = w.Write([]byte(`{"Id":"probe"}`))
+				return
+			}
+			if r.URL.RawQuery == "wait" {
+				close(createStarted)
+				<-releaseCreate
+			}
 			bodies <- body
 			w.WriteHeader(http.StatusCreated)
-		case strings.HasSuffix(r.URL.Path, "/start"):
+		case strings.HasSuffix(r.URL.Path, "/images/json"):
+			if probes.Add(1) == 1 {
+				http.Error(w, "probe unavailable", http.StatusServiceUnavailable)
+				return
+			}
+			_, _ = w.Write([]byte(`[{"Id":"probe-image"}]`))
+		case strings.HasSuffix(r.URL.Path, "/containers/json"):
+			_, _ = w.Write([]byte(`[]`))
+		case strings.HasSuffix(r.URL.Path, "/json"):
+			http.NotFound(w, r)
+		case strings.HasSuffix(r.URL.Path, "/archive"):
+			w.Header().Set("X-Docker-Container-Path-Stat", "e30=")
+		case r.Method == http.MethodDelete:
+			w.WriteHeader(http.StatusNoContent)
+		case r.URL.Path == "/exec/detached/start" || r.URL.Path == "/exec/error/start":
+			if r.URL.Path == "/exec/error/start" {
+				w.Header().Set("Content-Type", "application/vnd.docker.raw-stream")
+				w.WriteHeader(http.StatusBadRequest)
+			}
+			_, _ = w.Write([]byte("ordinary"))
+		case rawStreamPath.MatchString(r.URL.Path) || r.URL.Path == "/session":
+			_, _ = io.Copy(io.Discard, r.Body)
 			conn, buffered, err := w.(http.Hijacker).Hijack()
 			if err != nil {
 				return
 			}
 			defer conn.Close()
-			_, _ = conn.Write([]byte("HTTP/1.1 200 OK\r\nContent-Type: application/vnd.docker.raw-stream\r\n\r\n"))
-			_, _ = io.Copy(conn, buffered)
+			if r.Header.Get("Upgrade") != "" {
+				_, _ = conn.Write([]byte("HTTP/1.1 101 Switching Protocols\r\nConnection: Upgrade\r\nUpgrade: tcp\r\n\r\nready\n"))
+			} else {
+				_, _ = conn.Write([]byte("HTTP/1.1 200 OK\r\nContent-Type: application/vnd.docker.raw-stream\r\n\r\nready\n"))
+			}
+			input, _ := io.ReadAll(buffered)
+			_, _ = conn.Write(append([]byte("final:"), input...))
+			streamsDone <- struct{}{}
 		default:
 			w.Header().Set("Api-Version", "1.47")
 			_, _ = w.Write([]byte("OK " + r.Method + " " + r.URL.Path))
@@ -83,34 +132,94 @@ func TestDockerProxy(t *testing.T) {
 	t.Cleanup(func() { _ = daemon.Close() })
 	proxy, err := StartDockerProxy(daemonSocket, shortTempDir(t), "job-1")
 	require.NoError(t, err)
-	client := &http.Client{Transport: &http.Transport{DialContext: func(ctx context.Context, _, _ string) (net.Conn, error) {
+	t.Cleanup(func() { _ = proxy.Close(context.Background()) })
+	proxy.SetMounts(map[string]string{"/workspace/o/r": "/volumes/job/_data", "/workspace/o/r/tmp": "", "/var/run/docker.sock": "/tmp/p/docker.sock", "/volumes": "/daemon/volumes"})
+	client := &http.Client{Timeout: 5 * time.Second, Transport: &http.Transport{DialContext: func(ctx context.Context, _, _ string) (net.Conn, error) {
 		return (&net.Dialer{}).DialContext(ctx, "unix", proxy.Socket)
 	}}}
+	t.Cleanup(client.CloseIdleConnections)
+	dialProxy := func(t *testing.T) *net.UnixConn {
+		t.Helper()
+		conn, err := net.DialUnix("unix", nil, &net.UnixAddr{Name: proxy.Socket, Net: "unix"})
+		require.NoError(t, err)
+		t.Cleanup(func() { _ = conn.Close() })
+		require.NoError(t, conn.SetDeadline(time.Now().Add(5*time.Second)))
+		return conn
+	}
+	startStream := func(t *testing.T, path, upgrade string) (*net.UnixConn, *bufio.Reader) {
+		t.Helper()
+		conn := dialProxy(t)
+		_, err := fmt.Fprintf(conn, "POST %s HTTP/1.1\r\nHost: docker\r\n%sContent-Length: 2\r\n\r\n{}input", path, upgrade)
+		require.NoError(t, err)
+		reader := bufio.NewReader(conn)
+		resp, err := http.ReadResponse(reader, nil)
+		require.NoError(t, err)
+		t.Cleanup(func() {
+			_ = conn.Close()
+			_ = resp.Body.Close()
+		})
+		prefix, err := reader.ReadString('\n')
+		require.NoError(t, err)
+		require.Equal(t, "ready\n", prefix)
+		return conn, reader
+	}
 
 	t.Run("labels creates", func(t *testing.T) {
-		for path, body := range map[string]string{
-			"/v1.47/containers/create": `{"Image":"alpine","Labels":{"own":"1"}}`,
-			"/networks/create":         `{"Name":"n"}`,
-			"/volumes/create":          `{"Name":"v","labels":null}`,
+		for _, testCase := range []struct{ path, body, want string }{
+			{
+				"/v1.47/containers/create", `{"Image":"alpine","Unknown":{"enabled":true},"Labels":{"own":"1","com.gitea.runner.job.job-0":""}}`,
+				`{"Image":"alpine","Unknown":{"enabled":true},"Labels":{"own":"1","com.gitea.runner.job.job-0":"","com.gitea.runner.job.job-1":""}}`,
+			},
+			{
+				"/containers/create", `{"HostConfig":{"Binds":["/workspace/o/r:/src:ro","/workspace/o/r/../r/sub/:/sub","workspace/o/r:/relative","/workspace/o/rest:/rest","/workspace/o/r/tmp/x:/tmp","named:/named","/anonymous","/workspace/o/r:ro","/volumes/job/_data/x:/daemon-path"]},"DriverOpts":{"o":"bind","device":"/workspace/o/r"},"Labels":{"Foo":"1","foo":"2"}}`,
+				`{"HostConfig":{"Binds":["/volumes/job/_data:/src:ro","/volumes/job/_data/sub:/sub","workspace/o/r:/relative","/workspace/o/rest:/rest","/workspace/o/r/tmp/x:/tmp","named:/named","/anonymous","/workspace/o/r:ro","/volumes/job/_data/x:/daemon-path"]},"DriverOpts":{"o":"bind","device":"/workspace/o/r"},"Labels":{"Foo":"1","foo":"2","com.gitea.runner.job.job-1":""}}`,
+			},
+			{
+				"/containers/create", `{"HostConfig":{"Mounts":[{"Type":"bind","Source":"/var/run/docker.sock","Target":"/var/run/docker.sock"},{"type":"bind","source":"/workspace/o/r/sub/","target":"/m"},{"Type":"bind","Source":"/workspace/o/r/sub/../data","Target":"/dotted"},{"Type":"bind","Source":"/workspace/o/r/../r","Target":"/escaping"},{"Type":"BIND","Source":"/workspace/o/r"},{"Type":"volume","Source":"/workspace/o/r"}]}}`,
+				`{"HostConfig":{"Mounts":[{"Type":"bind","Source":"/tmp/p/docker.sock","Target":"/var/run/docker.sock"},{"Type":"bind","Source":"/volumes/job/_data/sub/","target":"/m"},{"Type":"bind","Source":"/volumes/job/_data/sub/../data","Target":"/dotted"},{"Type":"bind","Source":"/volumes/job/_data","Target":"/escaping"},{"Type":"BIND","Source":"/workspace/o/r"},{"Type":"volume","Source":"/workspace/o/r"}]},"Labels":{"com.gitea.runner.job.job-1":""}}`,
+			},
+			{
+				"/containers/create", `{"HostConfig":{"Mounts":[{"Type":"volume","VolumeOptions":{"DriverConfig":{"Options":{"o":"bind","device":"/workspace/o/r/data"}}}},{"Type":"volume","VolumeOptions":{"DriverConfig":{"Options":{"o":"unbindable","device":"/workspace/o/r"}}}},{"Type":"volume","VolumeOptions":{"DriverConfig":{"Options":{"o":"bind,remount","device":"/workspace/o/r"}}}},{"Type":"volume","VolumeOptions":{"DriverConfig":{"Name":"plugin","Options":{"o":"bind","device":"/workspace/o/r"}}}}]}}`,
+				`{"HostConfig":{"Mounts":[{"Type":"volume","VolumeOptions":{"DriverConfig":{"Options":{"o":"bind","device":"/volumes/job/_data/data"}}}},{"Type":"volume","VolumeOptions":{"DriverConfig":{"Options":{"o":"unbindable","device":"/workspace/o/r"}}}},{"Type":"volume","VolumeOptions":{"DriverConfig":{"Options":{"o":"bind,remount","device":"/workspace/o/r"}}}},{"Type":"volume","VolumeOptions":{"DriverConfig":{"Name":"plugin","Options":{"o":"bind","device":"/workspace/o/r"}}}}]},"Labels":{"com.gitea.runner.job.job-1":""}}`,
+			},
+			{
+				"/containers/create", `{"HostConfig":{"privileged":true,"Privileged":false,"Binds":["/workspace/o/r:/src"]},"hoſtconfig":null}`,
+				`{"HostConfig":{"privileged":true,"Privileged":false,"Binds":["/workspace/o/r:/src"]},"hoſtconfig":null,"Labels":{"com.gitea.runner.job.job-1":""}}`,
+			},
+			{
+				"/networks/create", `{"Name":"n"}`,
+				`{"Name":"n","Labels":{"com.gitea.runner.job.job-1":""}}`,
+			},
+			{
+				"/volumes/create", `{"Name":"v","labels":null,"DriverOpts":{"type":"none","o":"rbind,ro","device":"/workspace/o/r/"},"HostConfig":{"Binds":["/workspace/o/r:/src"]}}`,
+				`{"Name":"v","Labels":{"com.gitea.runner.job.job-1":""},"DriverOpts":{"type":"none","o":"rbind,ro","device":"/volumes/job/_data/"},"HostConfig":{"Binds":["/workspace/o/r:/src"]}}`,
+			},
+			{
+				"/volumes/create", `{"Name":"d","DriverOpts":{"o":"bind","device":1,"device":"/workspace/o/r"}}`,
+				`{"Name":"d","DriverOpts":{"o":"bind","device":1,"device":"/workspace/o/r"},"Labels":{"com.gitea.runner.job.job-1":""}}`,
+			},
+			{
+				"/volumes/create", `{"Name":"p","Driver":"plugin","DriverOpts":{"o":"bind","device":"/workspace/o/r"}}`,
+				`{"Name":"p","Driver":"plugin","DriverOpts":{"o":"bind","device":"/workspace/o/r"},"Labels":{"com.gitea.runner.job.job-1":""}}`,
+			},
+			{
+				"/volumes/create", "",
+				`{"Labels":{"com.gitea.runner.job.job-1":""}}`,
+			},
+			{
+				"/volumes/create", "null",
+				`{"Labels":{"com.gitea.runner.job.job-1":""}}`,
+			},
+			{
+				"/volumes/create", `{"Labels":{"discard":"1"},"labels":null,"LABELS":{"own":"1"},"LABELS":{"extra":"2"}}`,
+				`{"Labels":{"own":"1","extra":"2","com.gitea.runner.job.job-1":""}}`,
+			},
 		} {
-			resp, err := client.Post("http://docker"+path, "application/json", strings.NewReader(body))
+			resp, err := client.Post("http://docker"+testCase.path, "application/json", strings.NewReader(testCase.body))
 			require.NoError(t, err)
 			resp.Body.Close()
-			assert.Equal(t, http.StatusCreated, resp.StatusCode)
-
-			var got map[string]json.RawMessage
-			require.NoError(t, json.Unmarshal(<-bodies, &got))
-			key := "Labels"
-			if _, ok := got["labels"]; ok {
-				key = "labels"
-			}
-			var labels map[string]string
-			require.NoError(t, json.Unmarshal(got[key], &labels))
-			assert.Equal(t, "job-1", labels[jobLabel], path)
-			if strings.Contains(body, "own") {
-				assert.Equal(t, "1", labels["own"])
-				assert.JSONEq(t, `"alpine"`, string(got["Image"]))
-			}
+			require.Equal(t, http.StatusCreated, resp.StatusCode)
+			assert.JSONEq(t, testCase.want, string(<-bodies), testCase.body)
 		}
 	})
 
@@ -123,58 +232,152 @@ func TestDockerProxy(t *testing.T) {
 		assert.Equal(t, "OK GET /v1.47/_ping", string(body))
 	})
 
-	t.Run("tunnels raw streams", func(t *testing.T) {
-		conn, err := net.Dial("unix", proxy.Socket)
-		require.NoError(t, err)
-		defer conn.Close()
-		_, err = conn.Write([]byte("POST /v1.47/exec/abc/start HTTP/1.1\r\nHost: docker\r\nContent-Length: 2\r\n\r\n{}ping\n"))
+	t.Run("discovery caches only successes", func(t *testing.T) {
+		if runtime.GOOS != "linux" {
+			t.Skip("automatic proxy discovery requires Linux")
+		}
+		t.Setenv("DOCKER_HOST", "unix://"+daemonSocket)
+		tempDir := shortTempDir(t)
+		t.Setenv("TMPDIR", tempDir)
+		require.Nil(t, NewDockerProxy(t.Context(), "failed"))
+		for _, job := range []string{"first", "second"} {
+			proxy := NewDockerProxy(t.Context(), job)
+			require.NotNil(t, proxy)
+			require.NoError(t, proxy.Close(context.Background()))
+		}
+		assert.EqualValues(t, 2, probes.Load())
+		workdir, err := os.Getwd()
 		require.NoError(t, err)
+		cached, _ := dockerProxyProbes.Load([3]string{"unix://" + daemonSocket, workdir, tempDir})
+		cached.(*dockerProxyProbe).directory.socket, _ = os.Stat(t.TempDir())
+		proxy := NewDockerProxy(t.Context(), "replaced daemon")
+		require.NotNil(t, proxy)
+		require.NoError(t, proxy.Close(context.Background()))
+		assert.EqualValues(t, 3, probes.Load())
+	})
+
+	t.Run("tunnels raw streams through stdin EOF", func(t *testing.T) {
+		for _, stream := range []struct{ path, upgrade string }{
+			{path: "/v1.47/exec/abc/start"},
+			{path: "/containers/abc/attach", upgrade: "Connection: Upgrade\r\nUpgrade: tcp\r\n"},
+		} {
+			conn, reader := startStream(t, stream.path, stream.upgrade)
+			require.NoError(t, conn.CloseWrite())
+			output, err := io.ReadAll(reader)
+			require.NoError(t, err)
+			assert.Equal(t, "final:input", string(output))
+			<-streamsDone
+		}
+	})
+
+	t.Run("detached and error responses retain keepalive label injection", func(t *testing.T) {
+		conn := dialProxy(t)
 		reader := bufio.NewReader(conn)
-		resp, err := http.ReadResponse(reader, nil)
+		for endpoint, status := range map[string]int{"detached": http.StatusOK, "error": http.StatusBadRequest} {
+			_, err := fmt.Fprintf(conn, "POST /exec/%s/start HTTP/1.1\r\nHost: docker\r\nContent-Length: 2\r\n\r\n{}", endpoint)
+			require.NoError(t, err)
+			resp, err := http.ReadResponse(reader, nil)
+			require.NoError(t, err)
+			body, err := io.ReadAll(resp.Body)
+			require.NoError(t, err)
+			require.NoError(t, resp.Body.Close())
+			assert.Equal(t, status, resp.StatusCode)
+			assert.Equal(t, "ordinary", string(body))
+			_, err = io.WriteString(conn, "POST /volumes/create HTTP/1.1\r\nHost: docker\r\nContent-Length: 0\r\n\r\n")
+			require.NoError(t, err)
+			resp, err = http.ReadResponse(reader, nil)
+			require.NoError(t, err)
+			require.NoError(t, resp.Body.Close())
+			require.Equal(t, http.StatusCreated, resp.StatusCode)
+			assert.JSONEq(t, `{"Labels":{"com.gitea.runner.job.job-1":""}}`, string(<-bodies))
+		}
+	})
+
+	t.Run("close joins streams and admitted create", func(t *testing.T) {
+		t.Cleanup(func() { close(releaseCreate) })
+		_, raw := startStream(t, "/exec/live/start", "")
+		_, upgraded := startStream(t, "/session", "Connection: Upgrade\r\nUpgrade: tcp\r\n")
+		creator := dialProxy(t)
+		_, err := io.WriteString(creator, "POST /volumes/create?wait HTTP/1.1\r\nHost: docker\r\nContent-Length: 2\r\n\r\n{}")
 		require.NoError(t, err)
-		defer resp.Body.Close()
-		assert.Equal(t, "application/vnd.docker.raw-stream", resp.Header.Get("Content-Type"))
-		echoed, err := reader.ReadString('\n')
+		<-createStarted
+		require.NoError(t, creator.CloseWrite())
+		closed := make(chan error, 1)
+		ctx, cancel := context.WithTimeout(t.Context(), 5*time.Second)
+		defer cancel()
+		go func() { closed <- proxy.Close(ctx) }()
+		for _, reader := range []*bufio.Reader{raw, upgraded} {
+			_, err := reader.ReadByte()
+			require.ErrorIs(t, err, io.EOF)
+			<-streamsDone
+		}
+		select {
+		case err := <-closed:
+			t.Fatalf("Close returned before admitted create settled: %v", err)
+		default:
+		}
+		releaseCreate <- struct{}{}
+		resp, err := http.ReadResponse(bufio.NewReader(creator), nil)
 		require.NoError(t, err)
-		assert.Equal(t, "{}ping\n", echoed)
+		require.NoError(t, resp.Body.Close())
+		require.Equal(t, http.StatusCreated, resp.StatusCode)
+		assert.JSONEq(t, `{"Labels":{"com.gitea.runner.job.job-1":""}}`, string(<-bodies))
+		require.NoError(t, <-closed)
 	})
 }
 
 func TestRemoveLabelledRemovesContainersNetworksAndVolumes(t *testing.T) {
-	ctx := context.Background()
-	filters := make(mobyclient.Filters).Add("label", jobLabel+"=job-1")
+	containerFailure := errors.New("container removal failed")
+	listFailure := errors.New("listing failed")
+	volumeFailure := errors.New("volume removal failed")
+	ctx := t.Context()
+	filters := make(mobyclient.Filters).Add("label", jobLabel+"job-1")
 	cli := &mockDockerClient{}
 	cli.On("ContainerList", ctx, mobyclient.ContainerListOptions{All: true, Filters: filters}).
-		Return(mobyclient.ContainerListResult{Items: []container.Summary{{ID: "c1", Names: []string{"/app"}}}}, nil)
-	cli.On("ContainerKill", ctx, "c1", mock.Anything).Return(mobyclient.ContainerKillResult{}, nil)
+		Return(mobyclient.ContainerListResult{Items: []container.Summary{{ID: "c1", Names: []string{"/app"}}}}, nil).Once()
+	cli.On("ContainerKill", ctx, "c1", mock.Anything).Return(mobyclient.ContainerKillResult{}, nil).Once()
 	cli.On("ContainerRemove", ctx, "c1", mobyclient.ContainerRemoveOptions{RemoveVolumes: true, Force: true}).
-		Return(mobyclient.ContainerRemoveResult{}, nil)
+		Return(mobyclient.ContainerRemoveResult{}, containerFailure).Once()
 	cli.On("NetworkList", ctx, mobyclient.NetworkListOptions{Filters: filters}).
-		Return(mobyclient.NetworkListResult{Items: []network.Summary{{ID: "n1", Name: "app_default"}}}, nil)
-	cli.On("NetworkRemove", ctx, "n1", mock.Anything).Return(mobyclient.NetworkRemoveResult{}, nil)
+		Return(mobyclient.NetworkListResult{Items: []network.Summary{{ID: "n1", Name: "stack_default", Scope: "swarm"}}}, listFailure).Once()
+	cli.On("NetworkRemove", ctx, "n1", mobyclient.NetworkRemoveOptions{}).Return(mobyclient.NetworkRemoveResult{}, cerrdefs.ErrInvalidArgument).Once()
 	cli.On("VolumeList", ctx, mobyclient.VolumeListOptions{Filters: filters}).
-		Return(mobyclient.VolumeListResult{Items: []volume.Volume{{Name: "app_data"}}}, nil)
-	cli.On("VolumeRemove", ctx, "app_data", mobyclient.VolumeRemoveOptions{}).Return(mobyclient.VolumeRemoveResult{}, nil)
+		Return(mobyclient.VolumeListResult{Items: []volume.Volume{{Name: "app_data"}}}, nil).Once()
+	cli.On("VolumeRemove", ctx, "app_data", mobyclient.VolumeRemoveOptions{}).Return(mobyclient.VolumeRemoveResult{}, volumeFailure).Once()
 
-	require.NoError(t, removeLabelled(ctx, cli, "job-1"))
+	err := removeLabelled(ctx, cli, "job-1")
+	require.ErrorIs(t, err, containerFailure)
+	require.ErrorIs(t, err, listFailure)
+	require.ErrorIs(t, err, volumeFailure)
+	require.NotErrorIs(t, err, cerrdefs.ErrInvalidArgument)
+	require.ErrorContains(t, err, "failed to remove container c1")
+	require.ErrorContains(t, err, "failed to remove volume app_data")
 	cli.AssertExpectations(t)
 }
 
 func TestDockerProxyWithDaemon(t *testing.T) {
 	requireDocker(t)
-	ctx := context.Background()
+	ctx := t.Context()
+	cleanupCtx := context.WithoutCancel(ctx)
 	require.NoError(t, NewDockerPullExecutor(NewDockerPullExecutorInput{Image: "alpine"})(ctx))
 	direct, err := GetDockerClient(ctx)
 	require.NoError(t, err)
 	defer direct.Close()
 	dir := shortTempDir(t)
-	seen, err := daemonSeesDir(ctx, dir)
+	seen, err := daemonSeesDir(ctx, direct, dir, dir)
 	require.NoError(t, err)
 	t.Logf("daemon sees the runner's filesystem: %v", seen)
-
-	job := "proxy-test-" + t.Name()
-	proxy, err := StartDockerProxy(daemonSocketPath(t, direct), dir, job)
+	seen, err = daemonSeesDir(ctx, direct, dir, shortTempDir(t))
 	require.NoError(t, err)
+	assert.False(t, seen)
+
+	job := "proxy-test-" + strconv.FormatInt(time.Now().UnixNano(), 36)
+	proxy, err := StartDockerProxy(daemonSocketPath(t, direct), dir, job)
+	if os.Geteuid() != 0 && errors.Is(err, os.ErrPermission) {
+		t.Skipf("non-root runners that cannot take the daemon socket's ownership get it directly: %v", err)
+	}
+	require.NoError(t, err)
+	t.Cleanup(func() { _ = proxy.Close(context.Background()) })
 	viaProxy, err := mobyclient.New(mobyclient.WithHost("unix://" + proxy.Socket))
 	require.NoError(t, err)
 	defer viaProxy.Close()
@@ -183,22 +386,24 @@ func TestDockerProxyWithDaemon(t *testing.T) {
 		Config: &container.Config{Image: "alpine", Cmd: []string{"sleep", "300"}, Labels: map[string]string{"own": "1"}},
 	})
 	require.NoError(t, err)
-	t.Cleanup(func() { _, _ = direct.ContainerRemove(ctx, created.ID, mobyclient.ContainerRemoveOptions{Force: true}) })
+	t.Cleanup(func() {
+		_, _ = direct.ContainerRemove(cleanupCtx, created.ID, mobyclient.ContainerRemoveOptions{Force: true})
+	})
 	_, err = viaProxy.ContainerStart(ctx, created.ID, mobyclient.ContainerStartOptions{})
 	require.NoError(t, err)
 	net, err := viaProxy.NetworkCreate(ctx, job, mobyclient.NetworkCreateOptions{})
 	require.NoError(t, err)
-	t.Cleanup(func() { _, _ = direct.NetworkRemove(ctx, net.ID, mobyclient.NetworkRemoveOptions{}) })
+	t.Cleanup(func() { _, _ = direct.NetworkRemove(cleanupCtx, net.ID, mobyclient.NetworkRemoveOptions{}) })
 	_, err = viaProxy.VolumeCreate(ctx, mobyclient.VolumeCreateOptions{Name: job})
 	require.NoError(t, err)
-	t.Cleanup(func() { _, _ = direct.VolumeRemove(ctx, job, mobyclient.VolumeRemoveOptions{Force: true}) })
+	t.Cleanup(func() { _, _ = direct.VolumeRemove(cleanupCtx, job, mobyclient.VolumeRemoveOptions{Force: true}) })
 
 	inspected, err := direct.ContainerInspect(ctx, created.ID, mobyclient.ContainerInspectOptions{})
 	require.NoError(t, err)
-	assert.Equal(t, map[string]string{"own": "1", jobLabel: job}, inspected.Container.Config.Labels)
+	assert.Subset(t, inspected.Container.Config.Labels, map[string]string{"own": "1", jobLabel + job: ""})
 	vol, err := direct.VolumeInspect(ctx, job, mobyclient.VolumeInspectOptions{})
 	require.NoError(t, err)
-	assert.Equal(t, job, vol.Volume.Labels[jobLabel])
+	assert.Contains(t, vol.Volume.Labels, jobLabel+job)
 
 	exec, err := viaProxy.ExecCreate(ctx, created.ID, mobyclient.ExecCreateOptions{Cmd: []string{"cat"}, AttachStdin: true, AttachStdout: true, TTY: true})
 	require.NoError(t, err)
@@ -212,6 +417,7 @@ func TestDockerProxyWithDaemon(t *testing.T) {
 	attached.Close()
 
 	require.NoError(t, proxy.Close(ctx))
+	require.NoError(t, RemoveDockerJobResources(ctx, job))
 	_, err = direct.ContainerInspect(ctx, created.ID, mobyclient.ContainerInspectOptions{})
 	assert.True(t, cerrdefs.IsNotFound(err))
 	_, err = direct.NetworkInspect(ctx, net.ID, mobyclient.NetworkInspectOptions{})
@@ -268,3 +474,332 @@ func BenchmarkDockerProxy(b *testing.B) {
 		})
 	}
 }
+
+type probeClient struct {
+	mobyclient.APIClient
+	create     func(context.Context, mobyclient.ContainerCreateOptions) (mobyclient.ContainerCreateResult, error)
+	remove     func(context.Context, string, mobyclient.ContainerRemoveOptions) (mobyclient.ContainerRemoveResult, error)
+	stat       func(string) error
+	mounts     []container.MountPoint
+	containers []container.Summary
+}
+
+func (c *probeClient) Info(_ctx context.Context, _opts mobyclient.InfoOptions) (mobyclient.SystemInfoResult, error) {
+	return mobyclient.SystemInfoResult{}, nil
+}
+
+func (c *probeClient) Close() error {
+	return nil
+}
+
+func (c *probeClient) ContainerList(context.Context, mobyclient.ContainerListOptions) (mobyclient.ContainerListResult, error) {
+	return mobyclient.ContainerListResult{Items: c.containers}, nil
+}
+
+func (c *probeClient) ContainerKill(context.Context, string, mobyclient.ContainerKillOptions) (mobyclient.ContainerKillResult, error) {
+	return mobyclient.ContainerKillResult{}, cerrdefs.ErrConflict
+}
+
+func (c *probeClient) ContainerInspect(context.Context, string, mobyclient.ContainerInspectOptions) (mobyclient.ContainerInspectResult, error) {
+	return mobyclient.ContainerInspectResult{Container: container.InspectResponse{Mounts: c.mounts}}, nil
+}
+
+func (c *probeClient) ImageList(context.Context, mobyclient.ImageListOptions) (mobyclient.ImageListResult, error) {
+	return mobyclient.ImageListResult{Items: []image.Summary{{ID: "removed-image"}, {ID: "probe-image"}}}, nil
+}
+
+func (c *probeClient) ContainerCreate(ctx context.Context, opts mobyclient.ContainerCreateOptions) (mobyclient.ContainerCreateResult, error) {
+	return c.create(ctx, opts)
+}
+
+func (c *probeClient) ContainerRemove(ctx context.Context, id string, opts mobyclient.ContainerRemoveOptions) (mobyclient.ContainerRemoveResult, error) {
+	return c.remove(ctx, id, opts)
+}
+
+func (c *probeClient) ContainerStatPath(_ context.Context, _ string, opts mobyclient.ContainerStatPathOptions) (mobyclient.ContainerStatPathResult, error) {
+	return mobyclient.ContainerStatPathResult{}, c.stat(opts.Path)
+}
+
+func TestDockerProxyDirectoryProbes(t *testing.T) {
+	type result struct {
+		seen bool
+		err  error
+	}
+	for name, createErr := range map[string]error{"unavailable directory": nil, "daemon error": errors.New("probe failed")} {
+		t.Run(name, func(t *testing.T) {
+			synctest.Test(t, func(t *testing.T) {
+				dir := t.TempDir()
+				socket, err := os.Stat(t.TempDir())
+				require.NoError(t, err)
+				key := [3]string{"daemon", dir, dir}
+				release := make(chan struct{})
+				var calls, removals atomic.Int32
+				visible := false
+				cli := &probeClient{
+					create: func(_ctx context.Context, _opts mobyclient.ContainerCreateOptions) (mobyclient.ContainerCreateResult, error) {
+						calls.Add(1)
+						<-release
+						return mobyclient.ContainerCreateResult{ID: "probe"}, createErr
+					},
+					stat: func(_path string) error {
+						if visible {
+							return nil
+						} else {
+							return cerrdefs.ErrNotFound
+						}
+					},
+					remove: func(_ctx context.Context, _id string, _opts mobyclient.ContainerRemoveOptions) (mobyclient.ContainerRemoveResult, error) {
+						removals.Add(1)
+						return mobyclient.ContainerRemoveResult{}, nil
+					},
+				}
+				results := make(chan result, 8)
+				for range cap(results) {
+					go func() {
+						probe, err := probeDockerProxyDirectory(t.Context(), cli, key, socket)
+						results <- result{probe.seen, err}
+					}()
+				}
+				synctest.Wait()
+				assert.EqualValues(t, 1, calls.Load())
+				replacement, err := os.Stat(t.TempDir())
+				require.NoError(t, err)
+				replaced := make(chan result, 1)
+				go func() {
+					probe, err := probeDockerProxyDirectory(t.Context(), cli, key, replacement)
+					replaced <- result{probe.seen, err}
+				}()
+				synctest.Wait()
+				assert.EqualValues(t, 2, calls.Load())
+				close(release)
+				for range cap(results) {
+					result := <-results
+					require.ErrorIs(t, result.err, createErr)
+					assert.False(t, result.seen)
+				}
+				replacementResult := <-replaced
+				require.ErrorIs(t, replacementResult.err, createErr)
+				assert.False(t, replacementResult.seen)
+				assert.EqualValues(t, 2, calls.Load())
+				if createErr == nil {
+					assert.EqualValues(t, 2, removals.Load())
+				} else {
+					assert.Zero(t, removals.Load())
+				}
+				createErr, visible = nil, true
+				probe, err := probeDockerProxyDirectory(t.Context(), cli, key, socket)
+				require.NoError(t, err)
+				assert.True(t, probe.seen)
+				assert.Equal(t, dir, probe.directory.dir)
+				assert.Equal(t, dir, probe.directory.daemonDir)
+				assert.EqualValues(t, 3, calls.Load())
+				entries, err := os.ReadDir(dir)
+				require.NoError(t, err)
+				assert.Empty(t, entries)
+			})
+		})
+	}
+	t.Run("cancelled caller leaves the probe to finish for the others", func(t *testing.T) {
+		synctest.Test(t, func(t *testing.T) {
+			dir := t.TempDir()
+			socket, err := os.Stat(t.TempDir())
+			require.NoError(t, err)
+			key := [3]string{"daemon", dir, dir}
+			ctx, cancel := context.WithCancel(t.Context())
+			defer cancel()
+			release := make(chan struct{})
+			var calls, removals atomic.Int32
+			cli := &probeClient{
+				create: func(ctx context.Context, _opts mobyclient.ContainerCreateOptions) (mobyclient.ContainerCreateResult, error) {
+					calls.Add(1)
+					<-release
+					return mobyclient.ContainerCreateResult{ID: "probe"}, ctx.Err()
+				},
+				stat: func(_path string) error { return nil },
+				remove: func(_ctx context.Context, _id string, _opts mobyclient.ContainerRemoveOptions) (mobyclient.ContainerRemoveResult, error) {
+					removals.Add(1)
+					return mobyclient.ContainerRemoveResult{}, nil
+				},
+			}
+			leader, follower, late := make(chan result, 1), make(chan result, 1), make(chan result, 1)
+			go func() {
+				probe, err := probeDockerProxyDirectory(ctx, cli, key, socket)
+				leader <- result{probe.seen, err}
+			}()
+			synctest.Wait()
+			go func() {
+				probe, err := probeDockerProxyDirectory(t.Context(), cli, key, socket)
+				follower <- result{probe.seen, err}
+			}()
+			synctest.Wait()
+			cancel()
+			leaderResult := <-leader
+			require.ErrorIs(t, leaderResult.err, context.Canceled)
+			assert.False(t, leaderResult.seen)
+			go func() {
+				probe, err := probeDockerProxyDirectory(t.Context(), cli, key, socket)
+				late <- result{probe.seen, err}
+			}()
+			synctest.Wait()
+			close(release)
+			for _, results := range []chan result{follower, late} {
+				result := <-results
+				require.NoError(t, result.err)
+				assert.True(t, result.seen)
+			}
+			assert.EqualValues(t, 1, calls.Load())
+			assert.EqualValues(t, 1, removals.Load())
+			_, cached := dockerProxyProbes.Load(key)
+			assert.True(t, cached)
+		})
+	})
+	t.Run("caller joining a probe that ran out of time retries", func(t *testing.T) {
+		synctest.Test(t, func(t *testing.T) {
+			dir := t.TempDir()
+			socket, err := os.Stat(t.TempDir())
+			require.NoError(t, err)
+			var calls atomic.Int32
+			cli := &probeClient{
+				create: func(ctx context.Context, _opts mobyclient.ContainerCreateOptions) (mobyclient.ContainerCreateResult, error) {
+					if calls.Add(1) == 1 {
+						<-ctx.Done()
+						return mobyclient.ContainerCreateResult{}, ctx.Err()
+					}
+					return mobyclient.ContainerCreateResult{ID: "probe"}, nil
+				},
+				stat: func(_path string) error { return nil },
+				remove: func(_ctx context.Context, _id string, _opts mobyclient.ContainerRemoveOptions) (mobyclient.ContainerRemoveResult, error) {
+					return mobyclient.ContainerRemoveResult{}, nil
+				},
+			}
+			probe, err := probeDockerProxyDirectory(t.Context(), cli, [3]string{"daemon", dir, dir}, socket)
+			require.NoError(t, err)
+			assert.True(t, probe.seen)
+			assert.EqualValues(t, 2, calls.Load())
+		})
+	})
+}
+
+func TestRemoveStaleProbeContainers(t *testing.T) {
+	synctest.Test(t, func(t *testing.T) {
+		probeMount := container.MountPoint{Type: mount.TypeBind, Destination: "/gitea-runner-probe"}
+		writableMount := container.MountPoint{Type: mount.TypeBind, Destination: "/gitea-runner-probe", RW: true}
+		var removed []string
+		cli := &probeClient{
+			containers: []container.Summary{
+				{ID: "abandoned", State: container.StateCreated, Mounts: []container.MountPoint{probeMount}},
+				{ID: "foreign", State: container.StateCreated, Mounts: []container.MountPoint{writableMount}},
+				{ID: "started", State: container.StateExited, Mounts: []container.MountPoint{probeMount}},
+			},
+			remove: func(_ctx context.Context, id string, _opts mobyclient.ContainerRemoveOptions) (mobyclient.ContainerRemoveResult, error) {
+				removed = append(removed, id)
+				return mobyclient.ContainerRemoveResult{}, nil
+			},
+		}
+		start := time.Now()
+		removeStaleProbeContainers(cli)
+		assert.Equal(t, []string{"abandoned"}, removed)
+		assert.GreaterOrEqual(t, time.Since(start), dockerProxyProbeWorkerTimeout+dockerProxyProbeTimeout)
+	})
+}
+
+func TestDaemonSeesDir(t *testing.T) {
+	dir := t.TempDir()
+	markers := make(map[string]bool)
+
+	for _, testCase := range []struct {
+		name      string
+		daemonDir string
+		removeErr error
+		seen      bool
+		removed   bool
+	}{
+		{name: "cleanup after cancellation", daemonDir: dir, seen: true, removed: true},
+		{name: "daemon without the directory", daemonDir: filepath.Join(dir, "missing")},
+		{name: "daemon with a different directory at that path", daemonDir: t.TempDir(), removed: true},
+		{name: "cleanup error after cancellation", daemonDir: dir, removeErr: errors.New("cleanup failed"), removed: true},
+	} {
+		t.Run(testCase.name, func(t *testing.T) {
+			ctx, cancel := context.WithCancel(t.Context())
+			defer cancel()
+			removed := false
+			var attemptedImages []string
+			cli := &probeClient{
+				create: func(_ctx context.Context, opts mobyclient.ContainerCreateOptions) (mobyclient.ContainerCreateResult, error) {
+					assert.Equal(t, []mount.Mount{{Type: mount.TypeBind, Source: testCase.daemonDir, Target: "/gitea-runner-probe", ReadOnly: true}}, opts.HostConfig.Mounts)
+					attemptedImages = append(attemptedImages, opts.Config.Image)
+					if opts.Config.Image == "removed-image" {
+						return mobyclient.ContainerCreateResult{}, cerrdefs.ErrNotFound
+					}
+					cancel()
+					if _, err := os.Stat(testCase.daemonDir); err != nil {
+						return mobyclient.ContainerCreateResult{}, cerrdefs.ErrInvalidArgument
+					}
+					return mobyclient.ContainerCreateResult{ID: "probe"}, nil
+				},
+				stat: func(path string) error {
+					marker := strings.TrimPrefix(path, "/gitea-runner-probe/")
+					assert.False(t, markers[marker])
+					markers[marker] = true
+					if _, err := os.Stat(filepath.Join(testCase.daemonDir, marker)); err != nil {
+						return cerrdefs.ErrNotFound
+					}
+					return nil
+				},
+				remove: func(ctx context.Context, id string, opts mobyclient.ContainerRemoveOptions) (mobyclient.ContainerRemoveResult, error) {
+					removed = true
+					assert.Equal(t, "probe", id)
+					assert.Equal(t, mobyclient.ContainerRemoveOptions{Force: true, RemoveVolumes: true}, opts)
+					require.NoError(t, ctx.Err())
+					_, bounded := ctx.Deadline()
+					assert.True(t, bounded)
+					return mobyclient.ContainerRemoveResult{}, testCase.removeErr
+				},
+			}
+			seen, err := daemonSeesDir(ctx, cli, dir, testCase.daemonDir)
+			require.ErrorIs(t, err, testCase.removeErr)
+			assert.Equal(t, []string{"removed-image", "probe-image"}, attemptedImages)
+			assert.Equal(t, testCase.seen, seen)
+			assert.Equal(t, testCase.removed, removed)
+
+			entries, err := os.ReadDir(dir)
+			require.NoError(t, err)
+			assert.Empty(t, entries)
+		})
+	}
+}
+
+func TestRunnerContainerWorkdir(t *testing.T) {
+	if runtime.GOOS == "windows" {
+		t.Skip("a runner container is Linux")
+	}
+	workdir := t.TempDir()
+	t.Chdir(workdir)
+	volume := container.MountPoint{Type: mount.TypeVolume, Source: "/daemon/_data", Destination: filepath.Dir(workdir)}
+	for _, testCase := range []struct {
+		name      string
+		mount     container.MountPoint
+		foreign   bool
+		daemonDir string
+	}{
+		{name: "volume above the working directory", mount: volume, daemonDir: filepath.Join(volume.Source, filepath.Base(workdir))},
+		{name: "tmpfs", mount: container.MountPoint{Type: mount.TypeTmpfs, Destination: volume.Destination}},
+		{name: "hostname of another container", mount: volume, foreign: true},
+	} {
+		cli := &probeClient{
+			mounts: []container.MountPoint{testCase.mount},
+			stat: func(path string) error {
+				if _, err := os.Stat(path); err != nil || testCase.foreign {
+					return cerrdefs.ErrNotFound
+				}
+				return nil
+			},
+		}
+		dir, daemonDir := runnerContainerWorkdir(t.Context(), cli)
+		assert.Equal(t, testCase.daemonDir, daemonDir, testCase.name)
+		assert.Equal(t, testCase.daemonDir != "", dir == workdir, testCase.name)
+	}
+	entries, err := os.ReadDir(workdir)
+	require.NoError(t, err)
+	assert.Empty(t, entries)
+}

act/container/docker_proxy_unix.go

@@ -0,0 +1,48 @@
+// Copyright 2026 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+//go:build !WITHOUT_DOCKER && (linux || darwin || netbsd || freebsd)
+
+package container
+
+import (
+	"encoding/binary"
+	"errors"
+	"io/fs"
+	"math"
+	"os"
+	"path/filepath"
+	"syscall"
+
+	"golang.org/x/sys/unix"
+)
+
+func copyDockerSocketPermissions(daemonSocket, socket string, info os.FileInfo) error {
+	stat, ok := info.Sys().(*syscall.Stat_t)
+	if !ok {
+		return errors.New("docker socket ownership is unavailable")
+	}
+	groupErr := os.Chown(socket, int(stat.Uid), int(stat.Gid))
+	if groupErr != nil && (!errors.Is(groupErr, fs.ErrPermission) || int(stat.Uid) != os.Geteuid()) {
+		return groupErr
+	}
+	if err := os.Chown(filepath.Dir(socket), int(stat.Uid), -1); err != nil {
+		return err
+	}
+	mode := uint16(info.Mode().Perm())
+	if err := os.Chmod(socket, fs.FileMode(mode)); err != nil || groupErr == nil {
+		return err
+	}
+	if size, err := unix.Getxattr(daemonSocket, "system.posix_acl_access", nil); err == nil && size > 0 {
+		return groupErr
+	}
+	owner, group, other := mode>>6, mode>>3&7, mode&7
+	acl := binary.LittleEndian.AppendUint32(nil, 2)
+	for _, entry := range []struct {
+		tag, perm uint16
+		id        uint32
+	}{{1, owner, math.MaxUint32}, {4, other, math.MaxUint32}, {8, group, stat.Gid}, {16, group | other, math.MaxUint32}, {32, other, math.MaxUint32}} {
+		acl = binary.LittleEndian.AppendUint32(binary.LittleEndian.AppendUint16(binary.LittleEndian.AppendUint16(acl, entry.tag), entry.perm), entry.id)
+	}
+	return unix.Setxattr(socket, "system.posix_acl_access", acl, 0) // names the group a rootless runner cannot chown to, its own group keeps what others had
+}

act/container/docker_proxy_windows.go

@@ -0,0 +1,15 @@
+// Copyright 2026 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+//go:build !WITHOUT_DOCKER
+
+package container
+
+import (
+	"errors"
+	"os"
+)
+
+func copyDockerSocketPermissions(_, _ string, _ os.FileInfo) error {
+	return errors.New("docker socket ownership cannot be preserved on Windows")
+}

act/container/docker_pull.go

@@ -2,7 +2,7 @@
 // Copyright 2020 The nektos/act Authors. All rights reserved.
 // SPDX-License-Identifier: MIT
 
-//go:build !(WITHOUT_DOCKER || !(linux || darwin || windows || netbsd))
+//go:build !(WITHOUT_DOCKER || !(linux || darwin || windows || netbsd || freebsd))
 
 package container
 
@@ -114,7 +114,7 @@ func getImagePullOptions(ctx context.Context, input NewDockerPullExecutorInput)
 		if err != nil {
 			return imagePullOptions, err
 		}
-		if authConfig.Username == "" && authConfig.Password == "" {
+		if authConfig.Username == "" && authConfig.Password == "" && authConfig.IdentityToken == "" && authConfig.RegistryToken == "" {
 			return imagePullOptions, nil
 		}
 		logger.Info("using DockerAuthConfig authentication for docker pull")

act/container/docker_pull_test.go

@@ -5,20 +5,24 @@
 package container
 
 import (
-	"context"
 	"io"
+	"os"
+	"path/filepath"
 	"strings"
 	"testing"
+	"testing/iotest"
 
-	"github.com/docker/cli/cli/config"
-	log "github.com/sirupsen/logrus"
-	"github.com/sirupsen/logrus/hooks/test"
+	"gitea.com/gitea/runner/act/common/logging"
+	"gitea.com/gitea/runner/act/common/logging/logtest"
+
+	"github.com/moby/moby/api/pkg/authconfig"
+	"github.com/moby/moby/api/types/registry"
 	assert "github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 )
 
 func init() {
-	log.SetLevel(log.DebugLevel)
+	logging.SetLevel(logging.LevelDebug)
 }
 
 func TestCleanImage(t *testing.T) {
@@ -36,18 +40,15 @@ func TestCleanImage(t *testing.T) {
 	}
 
 	for _, table := range tables {
-		imageOut := cleanImage(context.Background(), table.imageIn)
+		imageOut := cleanImage(t.Context(), table.imageIn)
 		assert.Equal(t, table.imageOut, imageOut)
 	}
 }
 
 func TestGetImagePullOptions(t *testing.T) {
-	ctx := context.Background()
+	ctx := t.Context()
 
-	orig := config.Dir()
-	t.Cleanup(func() { config.SetDir(orig) })
-
-	config.SetDir("/non-existent/docker")
+	t.Setenv("DOCKER_CONFIG", "/non-existent/docker")
 
 	options, err := getImagePullOptions(ctx, NewDockerPullExecutorInput{})
 	assert.NoError(t, err, "Failed to create ImagePullOptions")                                                 //nolint:testifylint // pre-existing issue from nektos/act
@@ -61,13 +62,28 @@ func TestGetImagePullOptions(t *testing.T) {
 	assert.NoError(t, err, "Failed to create ImagePullOptions") //nolint:testifylint // pre-existing issue from nektos/act
 	assert.Equal(t, "eyJ1c2VybmFtZSI6InVzZXJuYW1lIiwicGFzc3dvcmQiOiJwYXNzd29yZCJ9", options.RegistryAuth, "Username and Password should be provided")
 
-	config.SetDir("testdata/docker-pull-options")
+	t.Setenv("DOCKER_CONFIG", "testdata/docker-pull-options")
 
 	options, err = getImagePullOptions(ctx, NewDockerPullExecutorInput{
 		Image: "nektos/act",
 	})
 	assert.NoError(t, err, "Failed to create ImagePullOptions") //nolint:testifylint // pre-existing issue from nektos/act
 	assert.Equal(t, "eyJ1c2VybmFtZSI6InVzZXJuYW1lIiwicGFzc3dvcmQiOiJwYXNzd29yZFxuIiwic2VydmVyYWRkcmVzcyI6Imh0dHBzOi8vaW5kZXguZG9ja2VyLmlvL3YxLyJ9", options.RegistryAuth, "RegistryAuth should be taken from local docker config")
+
+	dir := t.TempDir()
+	require.NoError(t, os.WriteFile(filepath.Join(dir, "config.json"), []byte(`{"auths":{"identity.example.com":{"identitytoken":"identity-token"},"registry.example.com":{"registrytoken":"registry-token"}}}`), 0o600))
+	t.Setenv("DOCKER_CONFIG", dir)
+	for host, want := range map[string]registry.AuthConfig{
+		"identity.example.com": {IdentityToken: "identity-token", ServerAddress: "identity.example.com"},
+		"registry.example.com": {RegistryToken: "registry-token", ServerAddress: "registry.example.com"},
+	} {
+		options, err := getImagePullOptions(ctx, NewDockerPullExecutorInput{Image: host + "/app"})
+		require.NoError(t, err)
+		require.NotEmpty(t, options.RegistryAuth, host)
+		got, err := authconfig.Decode(options.RegistryAuth)
+		require.NoError(t, err)
+		assert.Equal(t, want, *got)
+	}
 }
 
 // A digest-pinned image is immutable, so its local copy is always current.
@@ -79,11 +95,15 @@ func TestIsPinnedImage(t *testing.T) {
 // The pull path reports a failure the daemon sent mid-stream, so it must carry the reason
 // whichever of the two shapes the daemon used.
 func TestLogDockerResponseError(t *testing.T) {
-	logger, _ := test.NewNullLogger()
+	logger := logging.New(logtest.New())
 	streamErr := func(line string) error {
 		return logDockerResponse(logger, io.NopCloser(strings.NewReader(line)), false)
 	}
 	require.EqualError(t, streamErr(`{"error":"toomanyrequests: rate limit exceeded"}`), "toomanyrequests: rate limit exceeded")
 	require.EqualError(t, streamErr(`{"errorDetail":{"message":"unexpected EOF"}}`), "unexpected EOF")
 	require.NoError(t, streamErr(`{"status":"Downloading"}`))
+	require.NoError(t, streamErr(`{"stream":"`+strings.Repeat("x", 70000)+`"}`))
+	require.ErrorIs(t, logDockerResponse(logger, io.NopCloser(io.MultiReader(
+		strings.NewReader(`{"status":"Downloading"}`+"\n"), iotest.ErrReader(io.ErrUnexpectedEOF),
+	)), false), io.ErrUnexpectedEOF)
 }

act/container/docker_ssh.go

@@ -0,0 +1,111 @@
+// Copyright 2026 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+//go:build !(WITHOUT_DOCKER || !(linux || darwin || windows || netbsd || freebsd))
+
+package container
+
+import (
+	"bytes"
+	"errors"
+	"fmt"
+	"io"
+	"net"
+	"os/exec"
+	"strings"
+	"sync"
+	"syscall"
+	"time"
+
+	"github.com/docker/cli/cli/connhelper/ssh"
+)
+
+func sshArgs(daemonURL string) ([]string, error) {
+	spec, err := ssh.ParseURL(daemonURL)
+	if err != nil {
+		return nil, err
+	}
+	remote := []string{"docker", "system", "dial-stdio"}
+	if strings.Trim(spec.Path, "/") != "" {
+		remote = []string{"docker", "--host=unix://" + spec.Path, "system", "dial-stdio"}
+	}
+	return spec.Command([]string{"-o", "ConnectTimeout=30", "-T"}, remote...)
+}
+
+func dialCommand(name string, args ...string) (net.Conn, error) {
+	conn := &commandConn{cmd: exec.Command(name, args...)}
+	conn.cmd.SysProcAttr = sshSysProcAttr() // a session of its own like docker's, so a ProxyCommand never reads the runner's terminal: https://github.com/docker/cli/issues/1707
+	conn.cmd.Stderr = &conn.stderr
+	conn.cmd.WaitDelay = time.Second // a ProxyCommand child keeping stderr open would otherwise block Wait after ssh exits
+	conn.wait = sync.OnceValue(func() error {
+		if err := conn.cmd.Wait(); err != nil && !errors.Is(err, exec.ErrWaitDelay) {
+			return fmt.Errorf("%s: %w: %s", strings.Join(conn.cmd.Args, " "), err, strings.TrimSpace(conn.stderr.String()))
+		}
+		return nil
+	})
+	var err error
+	if conn.stdin, err = conn.cmd.StdinPipe(); err != nil {
+		return nil, err
+	}
+	if conn.stdout, err = conn.cmd.StdoutPipe(); err != nil {
+		return nil, err
+	}
+	return conn, conn.cmd.Start()
+}
+
+type commandConn struct {
+	cmd    *exec.Cmd
+	stdin  io.WriteCloser
+	stdout io.ReadCloser
+	stderr cappedBuffer
+	wait   func() error
+}
+
+func (c *commandConn) waitWithin(timeout time.Duration) error {
+	timer := time.AfterFunc(timeout, func() { _ = c.cmd.Process.Kill() })
+	defer timer.Stop()
+	return c.wait()
+}
+
+func (c *commandConn) Read(p []byte) (int, error) {
+	n, err := c.stdout.Read(p)
+	if errors.Is(err, io.EOF) {
+		if waitErr := c.waitWithin(10 * time.Second); waitErr != nil {
+			return n, waitErr
+		}
+	}
+	return n, err
+}
+
+func (c *commandConn) Write(p []byte) (int, error) { return c.stdin.Write(p) }
+
+// CloseWrite lets the daemon see the end of a hijacked stream, like a TCP half-close.
+func (c *commandConn) CloseWrite() error { return c.stdin.Close() }
+
+func (c *commandConn) Close() error {
+	_ = c.stdin.Close()
+	if c.cmd.Process.Signal(syscall.SIGTERM) != nil { // SIGTERM lets ssh take its ProxyCommand down, Windows only kills
+		_ = c.cmd.Process.Kill()
+	}
+	_ = c.waitWithin(3 * time.Second)
+	return nil
+}
+
+func (c *commandConn) LocalAddr() net.Addr { return &net.UnixAddr{Name: "stdio", Net: "unix"} }
+
+func (c *commandConn) RemoteAddr() net.Addr { return &net.UnixAddr{Name: "stdio", Net: "unix"} }
+
+func (c *commandConn) SetDeadline(_deadline time.Time) error { return nil }
+
+func (c *commandConn) SetReadDeadline(_deadline time.Time) error { return nil }
+
+func (c *commandConn) SetWriteDeadline(_deadline time.Time) error { return nil }
+
+type cappedBuffer struct{ bytes.Buffer }
+
+func (b *cappedBuffer) Write(p []byte) (int, error) {
+	if b.Len() > 4096 {
+		b.Reset()
+	}
+	return b.Buffer.Write(p)
+}

act/container/docker_ssh_linux.go

@@ -0,0 +1,12 @@
+// Copyright 2026 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+//go:build !WITHOUT_DOCKER
+
+package container
+
+import "syscall"
+
+func sshSysProcAttr() *syscall.SysProcAttr {
+	return &syscall.SysProcAttr{Setsid: true, Pdeathsig: syscall.SIGKILL}
+}

act/container/docker_ssh_test.go

@@ -0,0 +1,52 @@
+// Copyright 2026 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+//go:build !(WITHOUT_DOCKER || !(linux || darwin || windows || netbsd || freebsd))
+
+package container
+
+import (
+	"io"
+	"os/exec"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestSSHArgs(t *testing.T) {
+	args, err := sshArgs("ssh://me@host:2222/run/user/1000/my docker.sock")
+	require.NoError(t, err)
+	assert.Equal(t, []string{"-l", "me", "-p", "2222", "-o", "ConnectTimeout=30", "-T", "--", "host", "docker '--host=unix:///run/user/1000/my docker.sock' system dial-stdio"}, args)
+
+	args, err = sshArgs("ssh://[::1]")
+	require.NoError(t, err)
+	assert.Equal(t, []string{"-o", "ConnectTimeout=30", "-T", "--", "::1", "docker system dial-stdio"}, args)
+
+	for _, invalid := range []string{"ssh://me:secret@host", "ssh://host?x=1", "ssh://host#x", "ssh://"} {
+		_, err := sshArgs(invalid)
+		assert.Error(t, err, invalid)
+	}
+}
+
+func TestDialCommandStreamsStdioAndReportsExit(t *testing.T) {
+	t.Parallel()
+	if _, err := exec.LookPath("sh"); err != nil {
+		t.Skip("needs a POSIX shell")
+	}
+	conn, err := dialCommand("sh", "-c", "cat")
+	require.NoError(t, err)
+	_, err = conn.Write([]byte("ping"))
+	require.NoError(t, err)
+	require.NoError(t, conn.(interface{ CloseWrite() error }).CloseWrite())
+	echoed, err := io.ReadAll(conn)
+	require.NoError(t, err)
+	assert.Equal(t, "ping", string(echoed))
+	require.NoError(t, conn.Close())
+
+	conn, err = dialCommand("sh", "-c", "exec 3<&0; cat <&3 >/dev/null & echo 'no route to host' >&2; exit 255")
+	require.NoError(t, err)
+	_, err = io.ReadAll(conn)
+	require.ErrorContains(t, err, "no route to host")
+	require.NoError(t, conn.Close())
+}

act/container/docker_ssh_unix.go

@@ -0,0 +1,12 @@
+// Copyright 2026 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+//go:build !WITHOUT_DOCKER && (darwin || netbsd || freebsd)
+
+package container
+
+import "syscall"
+
+func sshSysProcAttr() *syscall.SysProcAttr {
+	return &syscall.SysProcAttr{Setsid: true}
+}

act/container/docker_ssh_windows.go

@@ -0,0 +1,10 @@
+// Copyright 2026 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+//go:build !WITHOUT_DOCKER
+
+package container
+
+import "syscall"
+
+func sshSysProcAttr() *syscall.SysProcAttr { return nil }

act/container/docker_stub.go

@@ -2,13 +2,14 @@
 // Copyright 2023 The nektos/act Authors. All rights reserved.
 // SPDX-License-Identifier: MIT
 
-//go:build WITHOUT_DOCKER || !(linux || darwin || windows || netbsd)
+//go:build WITHOUT_DOCKER || !(linux || darwin || windows || netbsd || freebsd)
 
 package container
 
 import (
 	"context"
 	"errors"
+	"net/netip"
 	"runtime"
 	"time"
 
@@ -17,6 +18,10 @@ import (
 	"github.com/moby/moby/api/types/system"
 )
 
+func IsolatedCacheContainer(context.Context, netip.Addr, string) (string, error) {
+	return "", nil
+}
+
 // ImageExistsLocally returns a boolean indicating if an image with the
 // requested name, tag and architecture exists in the local docker image store
 func ImageExistsLocally(ctx context.Context, imageName, platform string) (bool, error) {
@@ -29,8 +34,12 @@ func RemoveImage(ctx context.Context, imageName string, force, pruneChildren boo
 	return false, errors.New("Unsupported Operation")
 }
 
-func DockerProxyDir(ctx context.Context) string {
-	return ""
+func RemoveDockerJobResources(_ context.Context, _ string) error {
+	return nil
+}
+
+func NewDockerProxy(_ context.Context, _ string) *DockerProxy {
+	return nil
 }
 
 func StartDockerProxy(daemonSocket, dir, job string) (*DockerProxy, error) {
@@ -82,6 +91,30 @@ func NewDockerNetworkRemoveExecutor(name string) common.Executor {
 	}
 }
 
-func RemoveOrphanNetworks(ctx context.Context, runnerUUID string, createdBefore time.Time) error {
+func NewDockerNetworkConnectExecutor(_, _ string) common.Executor {
+	return func(_ context.Context) error {
+		return nil
+	}
+}
+
+func NewDockerNetworkDisconnectExecutor(_, _ string) common.Executor {
+	return func(_ context.Context) error {
+		return nil
+	}
+}
+
+func RemoveOrphanNetworks(_ context.Context, _, _ string, _ time.Time) error {
+	return nil
+}
+
+func SanitizeBinds(_ context.Context, _, binds []string) []string {
+	return binds
+}
+
+func CreateJobVolumes(ctx context.Context, runnerUUID string, volumeNames []string) error {
+	return nil
+}
+
+func RemoveOrphanJobVolumes(ctx context.Context, runnerUUID string, createdBefore time.Time) error {
 	return nil
 }

act/container/docker_volume.go

@@ -2,46 +2,73 @@
 // Copyright 2020 The nektos/act Authors. All rights reserved.
 // SPDX-License-Identifier: MIT
 
-//go:build !(WITHOUT_DOCKER || !(linux || darwin || windows || netbsd))
+//go:build !(WITHOUT_DOCKER || !(linux || darwin || windows || netbsd || freebsd))
 
 package container
 
 import (
 	"context"
+	"errors"
+	"fmt"
+	"time"
 
 	"gitea.com/gitea/runner/act/common"
 
+	cerrdefs "github.com/containerd/errdefs"
 	"github.com/moby/moby/client"
 )
 
-func NewDockerVolumeRemoveExecutor(volumeName string, force bool) common.Executor {
-	return func(ctx context.Context) error {
-		cli, err := GetDockerClient(ctx)
-		if err != nil {
-			return err
-		}
-		defer cli.Close()
-
-		list, err := cli.VolumeList(ctx, client.VolumeListOptions{})
-		if err != nil {
-			return err
-		}
-
-		for _, vol := range list.Items {
-			if vol.Name == volumeName {
-				return removeExecutor(volumeName, force)(ctx)
-			}
-		}
-
-		// Volume not found - do nothing
-		return nil
+func CreateJobVolumes(ctx context.Context, runnerUUID string, volumeNames []string) error {
+	cli, err := GetDockerClient(ctx)
+	if err != nil {
+		return err
 	}
+	defer cli.Close()
+
+	for _, volumeName := range volumeNames {
+		if _, err := cli.VolumeCreate(ctx, client.VolumeCreateOptions{
+			Name:   volumeName,
+			Labels: runnerLabels(runnerUUID),
+		}); err != nil {
+			return err
+		}
+	}
+	return nil
 }
 
-func removeExecutor(volume string, force bool) common.Executor {
+func RemoveOrphanJobVolumes(ctx context.Context, runnerUUID string, createdBefore time.Time) error {
+	cli, err := GetDockerClient(ctx)
+	if err != nil {
+		return fmt.Errorf("failed to connect to the docker daemon: %w", err)
+	}
+	defer cli.Close()
+
+	volumes, err := cli.VolumeList(ctx, client.VolumeListOptions{
+		Filters: make(client.Filters).Add("label", runnerUUIDLabel+"="+runnerUUID).Add("dangling", "true"),
+	})
+	if err != nil {
+		return err
+	}
+
+	var errs []error
+	for _, item := range volumes.Items {
+		created, err := time.Parse(time.RFC3339, item.CreatedAt)
+		// an unreadable or recent timestamp may belong to a job that is still starting up
+		if err != nil || created.After(createdBefore) || item.Labels[runnerUUIDLabel] != runnerUUID {
+			continue
+		}
+		if _, err := cli.VolumeRemove(ctx, item.Name, client.VolumeRemoveOptions{}); err != nil && !cerrdefs.IsNotFound(err) {
+			errs = append(errs, fmt.Errorf("failed to remove volume %s: %w", item.Name, err))
+			continue
+		}
+		common.Logger(ctx).Infof("removed docker volume %s left behind by an earlier job", item.Name)
+	}
+	return errors.Join(errs...)
+}
+
+func NewDockerVolumeRemoveExecutor(volumeName string, force bool) common.Executor {
 	return func(ctx context.Context) error {
-		logger := common.Logger(ctx)
-		logger.Debugf("docker volume rm %s", volume)
+		common.Logger(ctx).Debugf("docker volume rm %s", volumeName)
 
 		if common.Dryrun(ctx) {
 			return nil
@@ -53,7 +80,10 @@ func removeExecutor(volume string, force bool) common.Executor {
 		}
 		defer cli.Close()
 
-		_, err = cli.VolumeRemove(ctx, volume, client.VolumeRemoveOptions{Force: force})
+		_, err = cli.VolumeRemove(ctx, volumeName, client.VolumeRemoveOptions{Force: force})
+		if cerrdefs.IsNotFound(err) { // already gone is the outcome we wanted
+			return nil
+		}
 		return err
 	}
 }

act/container/executions_environment.go

@@ -4,7 +4,18 @@
 
 package container
 
-import "context"
+import (
+	"context"
+	"path"
+	"strings"
+)
+
+func JoinPath(elem ...string) string { // path.Join would collapse the leading // of a UNC act path on a Windows host
+	if len(elem) > 0 && strings.HasPrefix(elem[0], "//") {
+		return "/" + path.Join(elem...)
+	}
+	return path.Join(elem...)
+}
 
 type ExecutionsEnvironment interface {
 	Container

act/container/helpers_test.go

@@ -4,7 +4,6 @@
 package container
 
 import (
-	"context"
 	"testing"
 
 	mobyclient "github.com/moby/moby/client"
@@ -15,7 +14,7 @@ import (
 // so the daemon has to be pinged explicitly here to decide whether to skip.
 func requireDocker(t *testing.T) {
 	t.Helper()
-	ctx := context.Background()
+	ctx := t.Context()
 	cli, err := GetDockerClient(ctx)
 	if err != nil {
 		t.Skipf("skipping: docker client unavailable: %v", err)

act/container/host_environment.go

@@ -7,6 +7,7 @@ package container
 import (
 	"archive/tar"
 	"bytes"
+	"cmp"
 	"context"
 	"errors"
 	"fmt"
@@ -27,9 +28,6 @@ import (
 	"gitea.com/gitea/runner/internal/pkg/process"
 
 	"github.com/creack/pty"
-	"github.com/go-git/go-billy/v5/helper/polyfill"
-	"github.com/go-git/go-billy/v5/osfs"
-	"github.com/go-git/go-git/v5/plumbing/format/gitignore"
 	"golang.org/x/term"
 )
 
@@ -42,7 +40,8 @@ type HostEnvironment struct {
 	// when Workdir points at a caller-owned checkout (e.g. `act` local mode).
 	CleanWorkdir bool
 	ActPath      string
-	CleanUp      func()
+	Root         string
+	TrackingID   string // RUNNER_TRACKING_ID of the job, a step with another value keeps its leftovers
 	StdOut       io.Writer
 	AllocatePTY  bool // allocate a pseudo-TTY for each step's process
 
@@ -67,15 +66,11 @@ func (e *HostEnvironment) processGroup(ctx context.Context) *process.Group {
 }
 
 func (e *HostEnvironment) Create(_, _ []string) common.Executor {
-	return func(ctx context.Context) error {
-		return nil
-	}
+	return common.NewPipelineExecutor()
 }
 
 func (e *HostEnvironment) Close() common.Executor {
-	return func(ctx context.Context) error {
-		return nil
-	}
+	return common.NewPipelineExecutor()
 }
 
 func (e *HostEnvironment) Copy(destPath string, files ...*FileEntry) common.Executor {
@@ -100,25 +95,16 @@ func (e *HostEnvironment) CopyDir(destPath, srcPath string, useGitIgnore, skipGi
 			srcPrefix += string(filepath.Separator)
 		}
 		logger.Debugf("Stripping prefix:%s src:%s", srcPrefix, srcPath)
-		var ignorer gitignore.Matcher
-		if useGitIgnore {
-			ps, err := gitignore.ReadPatterns(polyfill.New(osfs.New(srcPath)), nil)
-			if err != nil {
-				logger.Debugf("Error loading .gitignore: %v", err)
-			}
-
-			ignorer = gitignore.NewMatcher(ps)
-		}
 		fc := &filecollector.FileCollector{
-			Ignorer:    ignorer,
-			SrcPath:    srcPath,
-			SrcPrefix:  srcPrefix,
-			SkipGitDir: skipGitDir,
+			SrcPath:      srcPath,
+			SrcPrefix:    srcPrefix,
+			SkipGitDir:   skipGitDir,
+			UseGitIgnore: useGitIgnore,
 			Handler: &filecollector.CopyCollector{
 				DstDir: destPath,
 			},
 		}
-		return filepath.Walk(srcPath, fc.CollectFiles(ctx, []string{}))
+		return filepath.Walk(srcPath, fc.CollectFiles(ctx))
 	}
 }
 
@@ -152,7 +138,7 @@ func (e *HostEnvironment) GetContainerArchive(ctx context.Context, srcPath strin
 			SrcPrefix: srcPrefix,
 			Handler:   tc,
 		}
-		err = filepath.Walk(srcPath, fc.CollectFiles(ctx, []string{}))
+		err = filepath.Walk(srcPath, fc.CollectFiles(ctx))
 		if err != nil {
 			return nil, err
 		}
@@ -180,15 +166,11 @@ func (e *HostEnvironment) GetContainerArchive(ctx context.Context, srcPath strin
 }
 
 func (e *HostEnvironment) Pull(_ bool) common.Executor {
-	return func(ctx context.Context) error {
-		return nil
-	}
+	return common.NewPipelineExecutor()
 }
 
 func (e *HostEnvironment) Start(_ bool) common.Executor {
-	return func(ctx context.Context) error {
-		return nil
-	}
+	return common.NewPipelineExecutor()
 }
 
 type ptyWriter struct {
@@ -205,7 +187,6 @@ func (w *ptyWriter) Write(buf []byte) (int, error) {
 		}
 		if w.dirtyLine || len(buf) > 1 && buf[len(buf)-2] != '\n' {
 			_, _ = w.Out.Write([]byte("\n"))
-			return n, io.EOF
 		}
 		return n, io.EOF
 	}
@@ -245,53 +226,43 @@ func setupPty(cmd *exec.Cmd, cmdline string) (*os.File, *os.File, error) {
 	return ppty, tty, nil
 }
 
-func writeKeepAlive(ppty io.Writer) {
-	c := 1
-	var err error
-	for c == 1 && err == nil {
-		c, err = ppty.Write([]byte{4})
-		<-time.After(time.Second)
-	}
-}
-
-func copyPtyOutput(writer io.Writer, ppty io.Reader, finishLog context.CancelFunc) {
-	defer func() {
-		finishLog()
-	}()
-	if _, err := io.Copy(writer, ppty); err != nil {
-		return
+func writeKeepAlive(ctx context.Context, ppty io.Writer) {
+	for ctx.Err() == nil {
+		if count, err := ppty.Write([]byte{4}); count != 1 || err != nil {
+			return
+		}
+		select {
+		case <-ctx.Done():
+			return
+		case <-time.After(time.Second):
+		}
 	}
 }
 
 func (e *HostEnvironment) UpdateFromImageEnv(_ *map[string]string) common.Executor {
-	return func(ctx context.Context) error {
-		return nil
-	}
+	return common.NewPipelineExecutor()
 }
 
 func getEnvListFromMap(env map[string]string) []string {
-	envList := make([]string, 0)
-	for k, v := range env {
-		envList = append(envList, fmt.Sprintf("%s=%s", k, v))
+	envList := make([]string, 0, len(env))
+	for key, value := range env {
+		envList = append(envList, key+"="+value)
 	}
 	return envList
 }
 
-func (e *HostEnvironment) exec(ctx context.Context, command []string, cmdline string, env map[string]string, _, workdir string) error {
-	envList := getEnvListFromMap(env)
-	var wd string
+func (e *HostEnvironment) exec(ctx context.Context, command []string, cmdline string, env map[string]string, workdir string) error {
+	wd := e.Path
 	if workdir != "" {
-		if filepath.IsAbs(workdir) {
-			wd = workdir
-		} else {
+		wd = workdir
+		if !filepath.IsAbs(workdir) {
 			wd = filepath.Join(e.Path, workdir)
 		}
-	} else {
-		wd = e.Path
 	}
 	// Flush any buffered, not-yet-newline-terminated trailing line, as the docker backend
 	// does in waitForCommand, so the final line of a command's output is not lost.
 	defer common.FlushWriter(e.StdOut)
+	process.UTF8Console()
 
 	f, err := lookupPathHost(command[0], env, e.StdOut)
 	if err != nil {
@@ -300,9 +271,13 @@ func (e *HostEnvironment) exec(ctx context.Context, command []string, cmdline st
 	cmd := exec.CommandContext(ctx, f)
 	cmd.Path = f
 	cmd.Args = command
-	cmd.Stdin = nil
 	cmd.Stdout = e.StdOut
-	cmd.Env = envList
+	trackingID := e.TrackingID
+	if value, ok := common.LookupFold(env, "RUNNER_TRACKING_ID", e.IsEnvironmentCaseInsensitive()); ok {
+		trackingID = value
+	}
+	tracked := trackingID == e.TrackingID
+	cmd.Env = append(getEnvListFromMap(env), "RUNNER_TRACKING_ID="+trackingID)
 	cmd.Stderr = e.StdOut
 	cmd.Dir = wd
 	cmd.SysProcAttr = process.SysProcAttr(cmdline, false)
@@ -310,6 +285,7 @@ func (e *HostEnvironment) exec(ctx context.Context, command []string, cmdline st
 	// Kills the step's whole tree on cancellation and bounds the post-exit I/O
 	// wait, so an orphan holding cmd's stdout pipe cannot hang cmd.Wait().
 	treeKill := process.NewTreeKill(cmd)
+	treeKill.KeepLeftovers = !tracked
 
 	var ppty *os.File
 	var tty *os.File
@@ -334,48 +310,51 @@ func (e *HostEnvironment) exec(ctx context.Context, command []string, cmdline st
 		writer = &ptyWriter{Out: e.StdOut}
 		var finishLog context.CancelFunc
 		logctx, finishLog = context.WithCancel(context.Background())
-		go copyPtyOutput(writer, ppty, finishLog)
-		go writeKeepAlive(ppty)
+		go func() {
+			defer finishLog()
+			_, _ = io.Copy(writer, ppty)
+		}()
+		go writeKeepAlive(logctx, ppty)
 	}
 	if err := cmd.Start(); err != nil {
 		return err
 	}
-	// Assign before the step's Killer so the step's job nests inside the group's;
-	// cancellation still scopes to this step's tree.
-	if err := e.processGroup(ctx).Assign(cmd.Process); err != nil {
-		common.Logger(ctx).Warnf("could not assign the step's process to the job's process group; a process it leaves behind may outlive the job: %v", err)
+	if tracked {
+		if err := e.processGroup(ctx).Assign(cmd.Process); err != nil {
+			common.Logger(ctx).Warnf("could not assign the step's process to the job's process group, a process it leaves behind may outlive the job: %v", err)
+		}
 	}
 	if k, kerr := treeKill.Capture(cmd.Process); kerr != nil {
 		common.Logger(ctx).Warnf("process tree kill setup failed, falling back to single-process kill: %v", kerr)
 	} else {
 		defer k.Close()
 	}
-	err = cmd.Wait()
-	if err != nil {
-		if exitErr, ok := errors.AsType[*exec.ExitError](err); ok {
-			return ExitCodeError(exitErr.ExitCode())
-		}
-		return err
-	}
+	err = treeKill.Wait(ctx, cmd)
 	if tty != nil {
 		writer.AutoStop.Store(true)
 		if _, err := tty.WriteString("\x04"); err != nil {
 			common.Logger(ctx).Debug("Failed to write EOT")
 		}
-		<-logctx.Done()
+		select {
+		case <-logctx.Done():
+		case <-ctx.Done(): // a cancelled step does not wait on output nobody consumes
+		}
 		ppty.Close()
 		ppty = nil
 	}
+	if exitErr, ok := errors.AsType[*exec.ExitError](err); ok {
+		return ExitCodeError(exitErr.ExitCode())
+	}
 	return err
 }
 
-func (e *HostEnvironment) Exec(command []string /*cmdline string, */, env map[string]string, user, workdir string) common.Executor {
-	return e.ExecWithCmdLine(command, "", env, user, workdir)
+func (e *HostEnvironment) Exec(command []string, env map[string]string, _user, workdir string) common.Executor {
+	return e.ExecWithCmdLine(command, "", env, workdir)
 }
 
-func (e *HostEnvironment) ExecWithCmdLine(command []string, cmdline string, env map[string]string, user, workdir string) common.Executor {
+func (e *HostEnvironment) ExecWithCmdLine(command []string, cmdline string, env map[string]string, workdir string) common.Executor {
 	return func(ctx context.Context) error {
-		if err := e.exec(ctx, command, cmdline, env, user, workdir); err != nil {
+		if err := e.exec(ctx, command, cmdline, env, workdir); err != nil {
 			select {
 			case <-ctx.Done():
 				return fmt.Errorf("this step has been cancelled: %w", err)
@@ -388,15 +367,13 @@ func (e *HostEnvironment) ExecWithCmdLine(command []string, cmdline string, env
 }
 
 func (e *HostEnvironment) UpdateFromEnv(srcPath string, env *map[string]string) common.Executor {
-	return parseEnvFile(e, srcPath, env)
+	return parseEnvFile(e, srcPath, env, runtime.GOOS == "windows")
 }
 
 // removeAll is a var so tests can substitute a blocking stub.
 var removeAll = os.RemoveAll
 
-// removeAllWithContext returns once the delete finishes or ctx is cancelled. On
-// cancellation the goroutine leaks: a delete inside a syscall cannot be
-// interrupted (see runWithTimeout).
+// Returns on cancel while an uninterruptible delete keeps running, freeing the runner's capacity slot.
 func removeAllWithContext(ctx context.Context, path string) error {
 	done := make(chan error, 1)
 	go func() { done <- removeAll(path) }()
@@ -438,35 +415,6 @@ func removePathWithRetry(ctx context.Context, path string) error {
 	return lastErr
 }
 
-// buildWindowsWorkspaceKillScript builds a PowerShell command that taskkills
-// every process tree whose ExecutablePath or CommandLine references one of the
-// given workspace dirs, releasing file handles for cleanup. Win32_Process
-// exposes both fields (Get-Process doesn't, wmic is deprecated); matching is on
-// the dir+separator prefix via ordinal String methods, so a name-prefix sibling
-// (job1 vs job10) is spared and path metacharacters stay literal.
-func buildWindowsWorkspaceKillScript(dirs []string) string {
-	quoted := make([]string, len(dirs))
-	for i, d := range dirs {
-		// Single-quoted PowerShell literal; escape ' by doubling it.
-		quoted[i] = "'" + strings.ReplaceAll(d, "'", "''") + "'"
-	}
-
-	return `$paths = @(` + strings.Join(quoted, ",") + `)
-$selfPid = $PID
-Get-CimInstance Win32_Process -ErrorAction SilentlyContinue | Where-Object {
-    if ($_.ProcessId -eq $selfPid) { return $false }
-    foreach ($p in $paths) {
-        $prefix = $p + '\'
-        if ($_.ExecutablePath -and $_.ExecutablePath.StartsWith($prefix, [System.StringComparison]::OrdinalIgnoreCase)) { return $true }
-        if ($_.CommandLine -and $_.CommandLine.IndexOf($prefix, [System.StringComparison]::OrdinalIgnoreCase) -ge 0) { return $true }
-    }
-    return $false
-} | ForEach-Object {
-    & taskkill.exe /PID $_.ProcessId /T /F 2>$null | Out-Null
-}
-`
-}
-
 func (e *HostEnvironment) terminateRunningProcesses(ctx context.Context) {
 	if runtime.GOOS != "windows" {
 		return
@@ -500,20 +448,10 @@ func (e *HostEnvironment) terminateRunningProcesses(ctx context.Context) {
 		return
 	}
 
-	script := buildWindowsWorkspaceKillScript(dirs)
-
-	cmd := exec.CommandContext(killCtx, "powershell.exe", "-NoProfile", "-NonInteractive", "-Command", script)
-	out, err := cmd.CombinedOutput()
-	if err != nil {
-		logger.Debugf("workspace process-tree kill via PowerShell failed: %v output=%s", err, strings.TrimSpace(string(out)))
-	}
-
-	// Win32_Process exposes no working directory, so the scan above misses a
-	// process that merely runs in a workspace dir while pinning a handle on it.
-	if killed, err := process.KillProcessesWithCWDUnder(killCtx, dirs); err != nil {
-		logger.Debugf("workspace process kill by working directory reported errors: %v", err)
+	if killed, err := process.KillProcessesWithPaths(killCtx, dirs, e.TrackingID); err != nil {
+		logger.Debugf("workspace process cleanup reported errors: %v", err)
 	} else if killed > 0 {
-		logger.Debugf("terminated %d leftover process(es) by workspace working directory", killed)
+		logger.Debugf("terminated %d leftover workspace process(es)", killed)
 	}
 }
 
@@ -521,26 +459,6 @@ func (e *HostEnvironment) terminateRunningProcesses(ctx context.Context) {
 // wedge the runner slot. A var so tests can shrink it.
 var hostCleanupTimeout = 30 * time.Second
 
-// runWithTimeout returns context.DeadlineExceeded once timeout elapses, leaking
-// the goroutine: a delete blocked in a syscall (AV filter driver, dead network
-// mount) cannot be interrupted, and leaking scratch state beats losing the
-// runner's capacity slot forever. The idle stale-dir sweep reclaims it later.
-func runWithTimeout(fn func(), timeout time.Duration) error {
-	done := make(chan struct{})
-	go func() {
-		defer close(done)
-		fn()
-	}()
-	timer := time.NewTimer(timeout)
-	defer timer.Stop()
-	select {
-	case <-done:
-		return nil
-	case <-timer.C:
-		return context.DeadlineExceeded
-	}
-}
-
 func (e *HostEnvironment) Remove() common.Executor {
 	return func(ctx context.Context) error {
 		logger := common.Logger(ctx)
@@ -552,25 +470,14 @@ func (e *HostEnvironment) Remove() common.Executor {
 		}
 		e.terminateRunningProcesses(ctx)
 
-		// Removes per-job misc state only, never the toolcache root. Bounded because
-		// CleanUp is a caller-supplied, typically unbounded os.RemoveAll.
-		if e.CleanUp != nil {
-			logger.Debugf("running host environment cleanup callback")
-			if err := runWithTimeout(e.CleanUp, hostCleanupTimeout); err != nil {
-				logger.Warnf("host environment cleanup did not finish within %s; continuing job completion, scratch state may be leaked and is reclaimed by the idle stale-dir sweep", hostCleanupTimeout)
-			} else {
-				logger.Debugf("host environment cleanup callback finished")
-			}
-		}
-
 		// Detach: a cancelled ctx would skip removePathWithRetry's retries,
 		// which absorb Windows file-handle release lag after the kill above.
 		rmCtx, rmCancel := context.WithTimeout(context.Background(), hostCleanupTimeout)
 		defer rmCancel()
 
 		var errs []error
-		if err := removePathWithRetry(rmCtx, e.Path); err != nil {
-			logger.Warnf("failed to remove host misc state %s: %v", e.Path, err)
+		if err := removePathWithRetry(rmCtx, cmp.Or(e.Root, e.Path)); err != nil {
+			logger.Warnf("failed to remove host misc state %s: %v", cmp.Or(e.Root, e.Path), err)
 			errs = append(errs, err)
 		}
 		if e.CleanWorkdir {
@@ -617,8 +524,7 @@ func (*HostEnvironment) GetPathVariableName() string {
 }
 
 func (e *HostEnvironment) DefaultPathVariable() string {
-	v, _ := os.LookupEnv(e.GetPathVariableName())
-	return v
+	return os.Getenv(e.GetPathVariableName())
 }
 
 func (*HostEnvironment) JoinPathVariable(paths ...string) string {
@@ -628,30 +534,23 @@ func (*HostEnvironment) JoinPathVariable(paths ...string) string {
 // Reference for Arch values for runner.arch
 // https://docs.github.com/en/actions/learn-github-actions/contexts#runner-context
 func goArchToActionArch(arch string) string {
-	archMapper := map[string]string{
+	return cmp.Or(map[string]string{
 		"x86_64":  "X64",
 		"amd64":   "X64",
 		"386":     "X86",
 		"arm":     "ARM",
 		"aarch64": "ARM64",
 		"arm64":   "ARM64",
-	}
-	if arch, ok := archMapper[arch]; ok {
-		return arch
-	}
-	return arch
+	}[arch], arch)
 }
 
 func goOsToActionOs(os string) string {
-	osMapper := map[string]string{
+	return cmp.Or(map[string]string{
 		"linux":   "Linux",
 		"darwin":  "macOS",
 		"windows": "Windows",
-	}
-	if os, ok := osMapper[os]; ok {
-		return os
-	}
-	return os
+		"freebsd": "FreeBSD",
+	}[os], os)
 }
 
 func (e *HostEnvironment) GetRunnerContext(_ context.Context) map[string]any {

act/container/host_environment_test.go

@@ -10,61 +10,47 @@ import (
 	"context"
 	"io"
 	"os"
-	"path"
 	"path/filepath"
 	"runtime"
 	"strings"
 	"testing"
+	"testing/synctest"
 	"time"
 
 	"gitea.com/gitea/runner/act/common"
+	"gitea.com/gitea/runner/act/common/logging"
 
-	"github.com/sirupsen/logrus"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 )
 
-// Type assert HostEnvironment implements ExecutionsEnvironment
 var _ ExecutionsEnvironment = &HostEnvironment{}
 
 func TestActionPlatformNames(t *testing.T) {
-	assert.Equal(t, []string{"Linux", "macOS", "Windows"}, []string{goOsToActionOs("linux"), goOsToActionOs("darwin"), goOsToActionOs("windows")})
+	assert.Equal(t, []string{"Linux", "macOS", "Windows", "FreeBSD"}, []string{goOsToActionOs("linux"), goOsToActionOs("darwin"), goOsToActionOs("windows"), goOsToActionOs("freebsd")})
 	assert.Equal(t, []string{"X86", "X64", "ARM", "ARM64"}, []string{goArchToActionArch("386"), goArchToActionArch("amd64"), goArchToActionArch("arm"), goArchToActionArch("arm64")})
 }
 
 func TestCopyDir(t *testing.T) {
-	dir := t.TempDir()
-	ctx := context.Background()
-	e := &HostEnvironment{
-		Path:      filepath.Join(dir, "path"),
-		TmpDir:    filepath.Join(dir, "tmp"),
-		ToolCache: filepath.Join(dir, "tool_cache"),
-		ActPath:   filepath.Join(dir, "act_path"),
-		StdOut:    os.Stdout,
-		Workdir:   path.Join("testdata", "scratch"),
-	}
-	_ = os.MkdirAll(e.Path, 0o700)
-	_ = os.MkdirAll(e.TmpDir, 0o700)
-	_ = os.MkdirAll(e.ToolCache, 0o700)
-	_ = os.MkdirAll(e.ActPath, 0o700)
-	err := e.CopyDir(e.Workdir, e.Path, true, false)(ctx)
-	assert.NoError(t, err)
-}
-
-func TestCopyDirSkipGitDir(t *testing.T) {
-	for name, skipGitDir := range map[string]bool{"kept for a workspace copy": false, "skipped for an action copy": true} {
-		t.Run(name, func(t *testing.T) {
+	for _, test := range []struct {
+		name                     string
+		useGitIgnore, skipGitDir bool
+	}{
+		{name: "git dir kept for a workspace copy"},
+		{name: "git dir skipped for an action copy", skipGitDir: true},
+		{name: "unfiltered outside a git repository", useGitIgnore: true},
+	} {
+		t.Run(test.name, func(t *testing.T) {
 			src := filepath.Join(t.TempDir(), "action")
 			require.NoError(t, os.MkdirAll(filepath.Join(src, ".git", "objects"), 0o700))
 			require.NoError(t, os.WriteFile(filepath.Join(src, ".git", "objects", "pack"), []byte("x"), 0o600))
 			require.NoError(t, os.WriteFile(filepath.Join(src, "action.yml"), []byte("name: x\n"), 0o600))
 
 			dest := filepath.Join(t.TempDir(), "dest")
-			e := &HostEnvironment{StdOut: os.Stdout}
-			require.NoError(t, e.CopyDir(dest, src+string(filepath.Separator), false, skipGitDir)(context.Background()))
+			require.NoError(t, (&HostEnvironment{}).CopyDir(dest, src+string(filepath.Separator), test.useGitIgnore, test.skipGitDir)(t.Context()))
 
 			assert.FileExists(t, filepath.Join(dest, "action.yml"))
-			if skipGitDir {
+			if test.skipGitDir {
 				assert.NoDirExists(t, filepath.Join(dest, ".git"))
 			} else {
 				assert.FileExists(t, filepath.Join(dest, ".git", "objects", "pack"))
@@ -74,63 +60,68 @@ func TestCopyDirSkipGitDir(t *testing.T) {
 }
 
 func TestGetContainerArchive(t *testing.T) {
-	dir := t.TempDir()
-	ctx := context.Background()
-	e := &HostEnvironment{
-		Path:      filepath.Join(dir, "path"),
-		TmpDir:    filepath.Join(dir, "tmp"),
-		ToolCache: filepath.Join(dir, "tool_cache"),
-		ActPath:   filepath.Join(dir, "act_path"),
-		StdOut:    os.Stdout,
-		Workdir:   path.Join("testdata", "scratch"),
-	}
-	_ = os.MkdirAll(e.Path, 0o700)
-	_ = os.MkdirAll(e.TmpDir, 0o700)
-	_ = os.MkdirAll(e.ToolCache, 0o700)
-	_ = os.MkdirAll(e.ActPath, 0o700)
+	ctx := t.Context()
+	e := &HostEnvironment{Path: t.TempDir()}
 	expectedContent := []byte("sdde/7sh")
 	err := os.WriteFile(filepath.Join(e.Path, "action.yml"), expectedContent, 0o600)
-	assert.NoError(t, err) //nolint:testifylint // pre-existing issue from nektos/act
+	require.NoError(t, err)
 	archive, err := e.GetContainerArchive(ctx, e.Path)
-	assert.NoError(t, err) //nolint:testifylint // pre-existing issue from nektos/act
+	require.NoError(t, err)
 	defer archive.Close()
 	reader := tar.NewReader(archive)
 	h, err := reader.Next()
-	assert.NoError(t, err) //nolint:testifylint // pre-existing issue from nektos/act
+	require.NoError(t, err)
 	assert.Equal(t, "action.yml", h.Name)
 	content, err := io.ReadAll(reader)
-	assert.NoError(t, err) //nolint:testifylint // pre-existing issue from nektos/act
+	require.NoError(t, err)
 	assert.Equal(t, expectedContent, content)
 	_, err = reader.Next()
 	assert.ErrorIs(t, err, io.EOF)
 }
 
 func TestHostEnvironmentExecExitCode(t *testing.T) {
+	t.Parallel()
 	if runtime.GOOS == "windows" {
 		t.Skip("uses POSIX shell")
 	}
-	dir := t.TempDir()
-	ctx := context.Background()
-	e := &HostEnvironment{
-		Path:      filepath.Join(dir, "path"),
-		TmpDir:    filepath.Join(dir, "tmp"),
-		ToolCache: filepath.Join(dir, "tool_cache"),
-		ActPath:   filepath.Join(dir, "act_path"),
-		StdOut:    io.Discard,
-		Workdir:   filepath.Join(dir, "path"),
-	}
-	for _, p := range []string{e.Path, e.TmpDir, e.ToolCache, e.ActPath} {
-		assert.NoError(t, os.MkdirAll(p, 0o700)) //nolint:testifylint // test setup
-	}
+	for name, allocatePTY := range map[string]bool{"without PTY": false, "with PTY": true} {
+		t.Run(name, func(t *testing.T) {
+			t.Parallel()
+			synctest.Test(t, func(t *testing.T) {
+				reader, writer := io.Pipe()
+				defer reader.Close()
+				e := &HostEnvironment{Path: t.TempDir(), StdOut: writer, AllocatePTY: allocatePTY}
+				t.Cleanup(func() { assert.NoError(t, e.Remove()(t.Context())) })
 
-	err := e.Exec([]string{"sh", "-c", "exit 3"}, map[string]string{"PATH": os.Getenv("PATH")}, "", "")(ctx)
-	var exitErr ExitCodeError
-	require.ErrorAs(t, err, &exitErr)
-	assert.Equal(t, ExitCodeError(3), exitErr)
-	assert.Equal(t, "Process completed with exit code 3.", err.Error())
+				result := make(chan error, 1)
+				go func() {
+					defer writer.Close()
+					result <- e.Exec([]string{"sh", "-c", "printf 'failed\\n'; exit 3"}, map[string]string{"PATH": os.Getenv("PATH")}, "", "")(t.Context())
+				}()
+				first := make([]byte, 1)
+				_, err := io.ReadFull(reader, first)
+				require.NoError(t, err)
+				synctest.Wait()
+				select {
+				case err := <-result:
+					t.Fatalf("Exec returned before its output was consumed: %v", err)
+				default:
+				}
+				remaining, err := io.ReadAll(reader)
+				require.NoError(t, err)
+				err = <-result
+				var exitErr ExitCodeError
+				require.ErrorAs(t, err, &exitErr)
+				assert.Equal(t, ExitCodeError(3), exitErr)
+				assert.Equal(t, "Process completed with exit code 3.", err.Error())
+				assert.Equal(t, "failed\n", string(first)+string(remaining))
+			})
+		})
+	}
 }
 
 func TestHostEnvironmentAllocatePTY(t *testing.T) {
+	t.Parallel()
 	if runtime.GOOS == "windows" {
 		t.Skip("uses POSIX shell")
 	}
@@ -143,25 +134,18 @@ func TestHostEnvironmentAllocatePTY(t *testing.T) {
 		{name: "on", allocPTY: true, expect: "TTY"},
 	} {
 		t.Run(tc.name, func(t *testing.T) {
-			dir := t.TempDir()
+			t.Parallel()
 			buf := &bytes.Buffer{}
 			e := &HostEnvironment{
-				Path:        filepath.Join(dir, "path"),
-				TmpDir:      filepath.Join(dir, "tmp"),
-				ToolCache:   filepath.Join(dir, "tool_cache"),
-				ActPath:     filepath.Join(dir, "act_path"),
+				Path:        t.TempDir(),
 				StdOut:      buf,
-				Workdir:     filepath.Join(dir, "path"),
 				AllocatePTY: tc.allocPTY,
 			}
-			for _, p := range []string{e.Path, e.TmpDir, e.ToolCache, e.ActPath} {
-				require.NoError(t, os.MkdirAll(p, 0o700))
-			}
 
 			err := e.Exec(
 				[]string{"sh", "-c", "[ -t 1 ] && printf TTY || printf NOTTY"},
 				map[string]string{"PATH": os.Getenv("PATH")}, "", "",
-			)(context.Background())
+			)(t.Context())
 			require.NoError(t, err)
 			got := strings.TrimSpace(strings.ReplaceAll(buf.String(), "\r", ""))
 			assert.Equal(t, tc.expect, got)
@@ -169,222 +153,88 @@ func TestHostEnvironmentAllocatePTY(t *testing.T) {
 	}
 }
 
-func TestHostEnvironmentRemovePreservesWorkdirByDefault(t *testing.T) {
-	logger := logrus.New()
-	ctx := common.WithLogger(context.Background(), logrus.NewEntry(logger))
-	base := t.TempDir()
-	miscRoot := filepath.Join(base, "misc")
-	path := filepath.Join(miscRoot, "hostexecutor")
-	require.NoError(t, os.MkdirAll(path, 0o700))
-	workdir := filepath.Join(base, "workspace", "owner", "repo")
-	require.NoError(t, os.MkdirAll(workdir, 0o700))
-
-	e := &HostEnvironment{
-		Path:    path,
-		Workdir: workdir,
-		CleanUp: func() {
-			_ = os.RemoveAll(miscRoot)
-		},
-		StdOut: os.Stdout,
+func TestHostEnvironmentRemoveWorkdir(t *testing.T) {
+	for name, owned := range map[string]bool{"preserves caller workdir": false, "cleans owned workdir": true} {
+		t.Run(name, func(t *testing.T) {
+			miscRoot, workdir := t.TempDir(), t.TempDir()
+			e := &HostEnvironment{
+				Path:         filepath.Join(miscRoot, "hostexecutor"),
+				Workdir:      workdir,
+				CleanWorkdir: owned,
+				Root:         miscRoot,
+			}
+			require.NoError(t, os.MkdirAll(e.Path, 0o700))
+			require.NoError(t, os.MkdirAll(filepath.Join(miscRoot, "tmp"), 0o700))
+			require.NoError(t, e.Remove()(t.Context()))
+			assert.NoDirExists(t, miscRoot)
+			_, err := os.Stat(workdir)
+			if owned {
+				assert.ErrorIs(t, err, os.ErrNotExist)
+			} else {
+				require.NoError(t, err)
+			}
+		})
 	}
-	require.NoError(t, e.Remove()(ctx))
-	_, err := os.Stat(workdir)
-	require.NoError(t, err)
-}
-
-func TestHostEnvironmentRemoveCleansWorkdirWhenOwned(t *testing.T) {
-	logger := logrus.New()
-	ctx := common.WithLogger(context.Background(), logrus.NewEntry(logger))
-	base := t.TempDir()
-	miscRoot := filepath.Join(base, "misc")
-	path := filepath.Join(miscRoot, "hostexecutor")
-	require.NoError(t, os.MkdirAll(path, 0o700))
-	workdir := filepath.Join(base, "workspace", "123", "owner", "repo")
-	require.NoError(t, os.MkdirAll(workdir, 0o700))
-
-	e := &HostEnvironment{
-		Path:         path,
-		Workdir:      workdir,
-		CleanWorkdir: true,
-		CleanUp: func() {
-			_ = os.RemoveAll(miscRoot)
-		},
-		StdOut: os.Stdout,
-	}
-	require.NoError(t, e.Remove()(ctx))
-	_, err := os.Stat(workdir)
-	assert.ErrorIs(t, err, os.ErrNotExist)
 }
 
 func TestRemoveAllWithContextDoesNotHangOnStuckDelete(t *testing.T) {
-	release := make(chan struct{})
-	stubDone := make(chan struct{})
+	synctest.Test(t, func(t *testing.T) {
+		release := make(chan struct{})
+		stubDone := make(chan struct{})
 
-	orig := removeAll
-	removeAll = func(string) error {
-		defer close(stubDone)
-		<-release
-		return nil
-	}
-	// removeAllWithContext intentionally leaks the delete goroutine on timeout,
-	// and that goroutine still references removeAll. Unblock it and wait for it
-	// to return before restoring the var, so the restore can't race the read.
-	t.Cleanup(func() {
-		close(release)
-		<-stubDone
-		removeAll = orig
-	})
-
-	ctx, cancel := context.WithTimeout(context.Background(), 100*time.Millisecond)
-	defer cancel()
-
-	err := removeAllWithContext(ctx, t.TempDir())
-	require.ErrorIs(t, err, context.DeadlineExceeded)
-}
-
-// TestHostEnvironmentRemoveDoesNotHangOnStuckCleanUp guards against a stalled
-// CleanUp callback (e.g. an os.RemoveAll blocked by an AV/EDR filter driver or
-// an unresponsive mount) wedging the runner slot forever at "Cleaning up
-// container". Remove must time out the callback and complete job teardown.
-func TestHostEnvironmentRemoveDoesNotHangOnStuckCleanUp(t *testing.T) {
-	// Keep the suite fast: shrink the per-phase teardown timeout for this test.
-	orig := hostCleanupTimeout
-	hostCleanupTimeout = 100 * time.Millisecond
-	t.Cleanup(func() { hostCleanupTimeout = orig })
-
-	logger := logrus.New()
-	ctx := common.WithLogger(context.Background(), logrus.NewEntry(logger))
-	base := t.TempDir()
-	path := filepath.Join(base, "misc", "hostexecutor")
-	require.NoError(t, os.MkdirAll(path, 0o700))
-
-	release := make(chan struct{})
-	t.Cleanup(func() { close(release) }) // unblock the leaked goroutine at test end
-
-	e := &HostEnvironment{
-		Path: path,
-		CleanUp: func() {
-			<-release // simulate a delete syscall stuck indefinitely
-		},
-		StdOut: os.Stdout,
-	}
-
-	done := make(chan error, 1)
-	go func() { done <- e.Remove()(ctx) }()
-
-	select {
-	case err := <-done:
-		require.NoError(t, err)
-	case <-time.After(10 * time.Second):
-		t.Fatal("Remove() hung on a stuck CleanUp callback")
-	}
-}
-
-// TestHostEnvironmentRemoveDoesNotHangOnStuckPathRemoval guards against a
-// stalled os.RemoveAll on the misc/workspace paths (same AV/EDR wedge as
-// #1023) wedging job completion after the CleanUp callback has already timed
-// out or finished.
-func TestHostEnvironmentRemoveDoesNotHangOnStuckPathRemoval(t *testing.T) {
-	origTimeout := hostCleanupTimeout
-	hostCleanupTimeout = 100 * time.Millisecond
-	t.Cleanup(func() { hostCleanupTimeout = origTimeout })
-
-	release := make(chan struct{})
-	stubDone := make(chan struct{})
-
-	origRemoveAll := removeAll
-	removeAll = func(string) error {
-		defer close(stubDone)
-		<-release
-		return nil
-	}
-	// The stuck delete goroutine outlives the timed-out Remove and still reads
-	// removeAll; unblock it and wait before restoring to avoid a restore/read race.
-	t.Cleanup(func() {
-		close(release)
-		<-stubDone
-		removeAll = origRemoveAll
-	})
-
-	logger := logrus.New()
-	ctx := common.WithLogger(context.Background(), logrus.NewEntry(logger))
-	base := t.TempDir()
-	path := filepath.Join(base, "misc", "hostexecutor")
-	require.NoError(t, os.MkdirAll(path, 0o700))
-
-	e := &HostEnvironment{
-		Path:   path,
-		StdOut: os.Stdout,
-	}
-
-	done := make(chan error, 1)
-	go func() { done <- e.Remove()(ctx) }()
-
-	select {
-	case err := <-done:
-		require.NoError(t, err)
-	case <-time.After(10 * time.Second):
-		t.Fatal("Remove() hung on a stuck path removal")
-	}
-}
-
-func TestBuildWindowsWorkspaceKillScript(t *testing.T) {
-	t.Run("single dir", func(t *testing.T) {
-		s := buildWindowsWorkspaceKillScript([]string{`C:\workspace\job1`})
-		assert.Contains(t, s, `$paths = @('C:\workspace\job1')`)
-		// Self-PID guard is essential — without it the script could taskkill
-		// the PowerShell process running it.
-		assert.Contains(t, s, "$selfPid = $PID")
-		assert.Contains(t, s, "$_.ProcessId -eq $selfPid")
-		// Must match both ExecutablePath (binaries from the workspace) and
-		// CommandLine (system binaries invoked with workspace paths in args),
-		// both bounded by dir+separator so a name-prefix sibling is spared.
-		assert.Contains(t, s, `$prefix = $p + '\'`)
-		assert.Contains(t, s, "$_.ExecutablePath.StartsWith($prefix")
-		assert.Contains(t, s, "$_.CommandLine.IndexOf($prefix")
-		// Each matched PID must be tree-killed, not just stopped.
-		assert.Contains(t, s, "taskkill.exe /PID $_.ProcessId /T /F")
-	})
-
-	t.Run("multiple dirs comma-separated", func(t *testing.T) {
-		s := buildWindowsWorkspaceKillScript([]string{
-			`C:\work\path`,
-			`C:\work\workdir`,
-			`C:\Users\runner\AppData\Local\Temp\job-42`,
+		orig := removeAll
+		removeAll = func(string) error {
+			defer close(stubDone)
+			<-release
+			return nil
+		}
+		t.Cleanup(func() {
+			close(release)
+			<-stubDone
+			removeAll = orig
 		})
-		assert.Contains(t, s, `'C:\work\path'`)
-		assert.Contains(t, s, `'C:\work\workdir'`)
-		assert.Contains(t, s, `'C:\Users\runner\AppData\Local\Temp\job-42'`)
-		// Commas between entries — no trailing comma, no leading comma.
-		assert.Contains(t, s, `'C:\work\path','C:\work\workdir',`)
-	})
 
-	t.Run("path with single quote is escaped", func(t *testing.T) {
-		// In PowerShell single-quoted strings the only special char is the
-		// quote itself, escaped by doubling. A workspace path that ever
-		// contained `'` would inject a command into the script otherwise.
-		s := buildWindowsWorkspaceKillScript([]string{`C:\work\it's\path`})
-		assert.Contains(t, s, `'C:\work\it''s\path'`)
-		// And it must NOT appear unescaped — otherwise the quote would
-		// terminate the literal early.
-		assert.NotContains(t, s, `'C:\work\it's\path'`)
-	})
+		ctx, cancel := context.WithTimeout(t.Context(), 100*time.Millisecond)
+		defer cancel()
 
-	t.Run("path with wildcard metacharacters is matched literally", func(t *testing.T) {
-		// A path containing [ ] ? * must be embedded verbatim and matched with
-		// ordinal String methods, not -like, otherwise the metacharacters would
-		// be interpreted as wildcards and the leftover process could escape.
-		s := buildWindowsWorkspaceKillScript([]string{`C:\work\[job]?1`})
-		assert.Contains(t, s, `'C:\work\[job]?1'`)
-		assert.NotContains(t, s, "-like")
-		assert.Contains(t, s, "StartsWith")
-		assert.Contains(t, s, "IndexOf")
-	})
-
-	t.Run("empty dir list still produces a valid script", func(t *testing.T) {
-		s := buildWindowsWorkspaceKillScript(nil)
-		// Empty array literal — script runs, matches nothing, is a no-op.
-		assert.Contains(t, s, "$paths = @()")
-		assert.Contains(t, s, "Get-CimInstance Win32_Process")
+		err := removeAllWithContext(ctx, t.TempDir())
+		require.ErrorIs(t, err, context.DeadlineExceeded)
 	})
 }
+
+func TestHostEnvironmentRemoveDoesNotHang(t *testing.T) {
+	synctest.Test(t, func(t *testing.T) {
+		origTimeout, origRemoveAll := hostCleanupTimeout, removeAll
+		hostCleanupTimeout = 100 * time.Millisecond
+		release, stubDone := make(chan struct{}), make(chan struct{})
+		removeAll = func(string) error {
+			defer close(stubDone)
+			<-release
+			return nil
+		}
+		t.Cleanup(func() {
+			close(release)
+			<-stubDone
+			hostCleanupTimeout, removeAll = origTimeout, origRemoveAll
+		})
+		e := &HostEnvironment{Path: filepath.Join(t.TempDir(), "misc", "hostexecutor"), StdOut: os.Stdout}
+		require.NoError(t, os.MkdirAll(e.Path, 0o700))
+		done := make(chan error, 1)
+		go func() { done <- e.Remove()(common.WithLogger(t.Context(), logging.Default())) }()
+		select {
+		case err := <-done:
+			require.NoError(t, err)
+		case <-time.After(10 * time.Second):
+			t.Fatal("Remove() hung on a stuck path removal")
+		}
+	})
+}
+
+func TestJoinPath(t *testing.T) {
+	assert.Equal(t, "//server/share/act/workflow/envs.txt", JoinPath("//server/share/act", "workflow/envs.txt"))
+	assert.Equal(t, "/var/run/act/workflow/envs.txt", JoinPath("/var/run/act/", "workflow", "envs.txt"))
+	for _, root := range []string{"//server/share/act", "/var/run/act", "C:/act"} {
+		assert.Equal(t, root+"/actions/key/main.go.out", JoinPath(root+"/actions/key", "main.go.out"))
+		assert.Equal(t, root+"/workflow", JoinPath(root+"/workflow/outputcmd.txt", ".."))
+	}
+}

act/container/host_environment_windows_test.go

@@ -0,0 +1,138 @@
+// Copyright 2026 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package container
+
+import (
+	"bufio"
+	"context"
+	"fmt"
+	"io"
+	"net"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"strings"
+	"testing"
+	"time"
+	"unsafe"
+
+	"github.com/stretchr/testify/require"
+	"golang.org/x/sys/windows"
+)
+
+func TestHostEnvironmentTrackingCleanup(t *testing.T) {
+	for _, tracking := range []string{"default", "", "shared-helper"} {
+		t.Run("tracking="+tracking, func(t *testing.T) {
+			ctx, cancel := context.WithTimeout(t.Context(), 30*time.Second)
+			defer cancel()
+			listener, err := net.Listen("tcp4", "127.0.0.1:0")
+			require.NoError(t, err)
+			defer listener.Close()
+			stop := context.AfterFunc(ctx, func() { _ = listener.Close() })
+			defer stop()
+			workspace := t.TempDir()
+			environment := &HostEnvironment{Path: t.TempDir(), TmpDir: workspace, Workdir: workspace, TrackingID: "gitea_test", StdOut: io.Discard}
+			env := map[string]string{}
+			for _, entry := range os.Environ() {
+				if name, value, ok := strings.Cut(entry, "="); ok && !strings.EqualFold(name, "RUNNER_TRACKING_ID") {
+					env[name] = value
+				}
+			}
+			env["GITEA_TRACKING_HELPER"] = "step"
+			env["GITEA_TRACKING_WORKSPACE"] = workspace
+			env["GITEA_TRACKING_ADDRESS"] = listener.Addr().String()
+			if tracking == "default" {
+				env["RUNNER_TRACKING_ID"] = environment.TrackingID
+				env["runner_tracking_id"] = "shared-helper"
+			} else {
+				env["runner_tracking_id"] = tracking
+			}
+			result := make(chan error, 1)
+			go func() {
+				result <- environment.Exec([]string{os.Args[0], "-test.run=^TestHostTrackingHelper$"}, env, "", workspace)(ctx)
+			}()
+			step, err := listener.Accept()
+			require.NoError(t, err)
+			defer step.Close()
+			require.NoError(t, step.SetDeadline(time.Now().Add(20*time.Second)))
+			var stepPID int
+			_, err = fmt.Fscanln(step, &stepPID)
+			require.NoError(t, err)
+			stepHandle, err := windows.OpenProcess(windows.PROCESS_QUERY_LIMITED_INFORMATION, false, uint32(stepPID))
+			require.NoError(t, err)
+			defer func() { _ = windows.CloseHandle(stepHandle) }()
+			require.Eventually(t, func() bool {
+				var assigned int32
+				result, _, _ := windows.NewLazySystemDLL("kernel32.dll").NewProc("IsProcessInJob").Call(uintptr(stepHandle), 0, uintptr(unsafe.Pointer(&assigned)))
+				return result != 0 && assigned != 0
+			}, 5*time.Second, 10*time.Millisecond)
+			_, err = step.Write([]byte{1})
+			require.NoError(t, err)
+			var helpers []windows.Handle
+			for range 2 {
+				connection, err := listener.Accept()
+				require.NoError(t, err)
+				t.Cleanup(func() { _ = connection.Close() })
+				require.NoError(t, connection.SetReadDeadline(time.Now().Add(20*time.Second)))
+				var pid int
+				_, err = fmt.Fscanln(connection, &pid)
+				require.NoError(t, err)
+				handle, err := windows.OpenProcess(windows.SYNCHRONIZE|windows.PROCESS_TERMINATE, false, uint32(pid))
+				require.NoError(t, err)
+				t.Cleanup(func() {
+					_ = windows.TerminateProcess(handle, 1)
+					_, _ = windows.WaitForSingleObject(handle, 5000)
+					_ = windows.CloseHandle(handle)
+				})
+				helpers = append(helpers, handle)
+			}
+			select {
+			case err := <-result:
+				require.NoError(t, err)
+			case <-ctx.Done():
+				t.Fatal(ctx.Err())
+			}
+			require.NoError(t, environment.Remove()(ctx))
+			for _, handle := range helpers {
+				if tracking == "default" {
+					result, err := windows.WaitForSingleObject(handle, 5000)
+					require.NoError(t, err)
+					require.EqualValues(t, windows.WAIT_OBJECT_0, result)
+				} else {
+					result, err := windows.WaitForSingleObject(handle, 0)
+					require.NoError(t, err)
+					require.EqualValues(t, windows.WAIT_TIMEOUT, result)
+				}
+			}
+		})
+	}
+}
+
+func TestHostTrackingHelper(t *testing.T) {
+	mode := os.Getenv("GITEA_TRACKING_HELPER")
+	if mode == "" {
+		return
+	}
+	connection, err := net.Dial("tcp4", os.Getenv("GITEA_TRACKING_ADDRESS"))
+	require.NoError(t, err)
+	_, err = fmt.Fprintln(connection, os.Getpid())
+	require.NoError(t, err)
+	if mode == "step" {
+		_, err := bufio.NewReader(connection).ReadByte()
+		require.NoError(t, err)
+	}
+	if mode != "descendant" {
+		child := exec.Command(os.Args[0], "-test.run=^TestHostTrackingHelper$", filepath.Join(os.Getenv("GITEA_TRACKING_WORKSPACE"), "tracking-reference"))
+		child.Env = append(os.Environ(), "GITEA_TRACKING_HELPER="+map[string]string{"step": "helper", "helper": "descendant"}[mode])
+		require.NoError(t, child.Start())
+		if mode == "step" {
+			require.NoError(t, connection.Close())
+			os.Exit(0)
+		}
+	}
+	_, err = io.Copy(io.Discard, connection)
+	require.NoError(t, err)
+	require.NoError(t, connection.Close())
+	os.Exit(0)
+}

act/container/kubernetes.go

@@ -0,0 +1,699 @@
+// Copyright 2026 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package container
+
+import (
+	"bufio"
+	"bytes"
+	"cmp"
+	"compress/gzip"
+	"context"
+	"crypto/rand"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"maps"
+	"net"
+	"net/http"
+	"net/url"
+	"os"
+	"path"
+	"regexp"
+	"slices"
+	"strings"
+	"time"
+
+	"gitea.com/gitea/runner/act/common"
+	"gitea.com/gitea/runner/act/common/logging"
+
+	"github.com/kballard/go-shellquote"
+	"github.com/spf13/pflag"
+)
+
+// KubernetesOptions configures the pod a job runs in.
+type KubernetesOptions struct {
+	Kubeconfig   string
+	Namespace    string
+	PodTemplates []map[string]any // merged in order, a later one winning
+	MaxLifetime  time.Duration
+	ForcePull    bool
+	RunnerUUID   string
+	Transfer     *KubernetesTransfer
+}
+
+// KubernetesPod runs a job container and its service containers as one pod.
+type KubernetesPod struct {
+	options          KubernetesOptions
+	client           *kubeClient
+	name, secretName string
+	job              *kubernetesContainer
+	services         []*kubernetesContainer
+	arch, path       string
+	ips              []net.IP
+	transfer         *transferServer
+	transferImage    string
+	transferHelper   string // empty when copies go through the API server
+}
+
+type kubernetesContainer struct {
+	LinuxContainerEnvironmentExtensions
+	pod   *KubernetesPod
+	id    string // the workflow's service id, name is its DNS label form
+	name  string
+	input *NewContainerInput
+	probe map[string]any
+	gzip  bool // the container can gunzip, so copies into it go compressed
+}
+
+type containerStatus struct {
+	Name  string
+	Ready bool
+	State struct {
+		Waiting    *struct{ Reason, Message string }
+		Running    *struct{}
+		Terminated *struct {
+			ExitCode int
+			Message  string
+		}
+	}
+}
+
+type podStatus struct {
+	Spec   struct{ Containers []struct{} }
+	Status struct {
+		Phase, Reason, Message                   string
+		PodIPs                                   []struct{ IP string }
+		Conditions                               []struct{ Type, Status, Message string }
+		InitContainerStatuses, ContainerStatuses []containerStatus
+	}
+}
+
+func NewKubernetesPod(options KubernetesOptions) (*KubernetesPod, error) {
+	client, err := newKubeClient(options.Kubeconfig, options.Namespace)
+	if err != nil {
+		return nil, fmt.Errorf("connect to Kubernetes: %w", err)
+	}
+	return &KubernetesPod{options: options, client: client}, nil
+}
+
+// JobContainer returns the container of the pod the job's steps run in.
+func (p *KubernetesPod) JobContainer(input *NewContainerInput) ExecutionsEnvironment {
+	p.job = &kubernetesContainer{pod: p, name: "job", input: input}
+	return p.job
+}
+
+var (
+	invalidLabelChars = regexp.MustCompile(`[^a-z0-9-]+`)
+	dnsSubdomain      = regexp.MustCompile(`^[a-z0-9]([-a-z0-9]*[a-z0-9])?(\.[a-z0-9]([-a-z0-9]*[a-z0-9])?)*$`)
+)
+
+// kubernetesServiceName returns the container name of service id, made a DNS label as it must be.
+func kubernetesServiceName(id string) string {
+	name := strings.Trim(invalidLabelChars.ReplaceAllString(strings.ToLower(id), "-"), "-")
+	return strings.TrimRight(name[:min(63, len(name))], "-")
+}
+
+// KubernetesServiceHostnames returns the hostnames of service id, its container name and, where hostAliases accept it as a DNS subdomain, id lowercased.
+func KubernetesServiceHostnames(id string) []string {
+	name, host := kubernetesServiceName(id), strings.ToLower(id)
+	if host != name && len(host) <= 253 && dnsSubdomain.MatchString(host) { // https://github.com/kubernetes/apimachinery/blob/v0.35.1/pkg/util/validation/validation.go#L198-L207
+		return []string{name, host}
+	}
+	return []string{name}
+}
+
+// ServiceContainer returns a container of the pod the job reaches at KubernetesServiceHostnames(id).
+func (p *KubernetesPod) ServiceContainer(id string, input *NewContainerInput) ExecutionsEnvironment {
+	service := &kubernetesContainer{pod: p, id: id, name: kubernetesServiceName(id), input: input}
+	p.services = append(p.services, service)
+	return service
+}
+
+func (p *KubernetesPod) create(ctx context.Context) error {
+	prefix := strings.Trim(strings.ToLower(p.job.input.Name), "-")
+	prefix = cmp.Or(strings.TrimRight(prefix[:min(40, len(prefix))], "-"), "gitea-runner") + "-"
+	name := prefix + strings.ToLower(rand.Text()[:8]) // chosen here, so cleanup knows it even when a create response is lost
+	labels := map[string]any{"app.kubernetes.io/managed-by": "gitea-runner"}
+	if p.options.RunnerUUID != "" {
+		labels[runnerUUIDLabel] = p.options.RunnerUUID
+	}
+	metadata := map[string]any{"name": name, "labels": labels}
+	var runnerImage string
+	if hostname, err := os.Hostname(); p.client.inCluster && err == nil {
+		var runner struct {
+			Metadata struct{ Name, UID string }
+			Spec     struct{ Containers []struct{ Image string } }
+		}
+		if err := p.client.do(ctx, http.MethodGet, p.client.path("pods/"+hostname), nil, &runner); err == nil {
+			metadata["ownerReferences"] = []any{map[string]any{"apiVersion": "v1", "kind": "Pod", "name": runner.Metadata.Name, "uid": runner.Metadata.UID}}
+			if len(runner.Spec.Containers) == 1 {
+				runnerImage = runner.Spec.Containers[0].Image
+			}
+		} else {
+			common.Logger(ctx).Debugf("The runner is not pod %s, job pods get no owner: %v", hostname, err)
+		}
+	}
+	if err := p.setupTransfer(runnerImage); err != nil {
+		return err
+	}
+	secretData := map[string]string{}
+	manifest, err := p.manifest(name, secretData, metadata)
+	if err != nil {
+		return err
+	}
+	for _, service := range p.services {
+		if !slices.ContainsFunc(KubernetesServiceHostnames(service.id), func(hostname string) bool { return strings.EqualFold(hostname, service.id) }) { // glibc and Go match /etc/hosts case-insensitively
+			common.Logger(ctx).Warnf("Service %s is reachable as %s or localhost, as a Kubernetes hostname cannot be %q", service.id, service.name, service.id)
+		}
+	}
+	if len(secretData) > 0 {
+		p.secretName = name // named like the pod, RemoveOrphanKubernetesResources finds it by that
+		if err := p.client.do(ctx, http.MethodPost, p.client.path("secrets"), map[string]any{"metadata": metadata, "stringData": secretData}, nil); err != nil {
+			return fmt.Errorf("create secret: %w", err)
+		}
+	}
+	p.name = name
+	if err := p.client.do(ctx, http.MethodPost, p.client.path("pods"), manifest, nil); err != nil {
+		return fmt.Errorf("create pod: %w", err)
+	}
+	return nil
+}
+
+func (p *KubernetesPod) manifest(secret string, secretData map[string]string, metadata map[string]any) (any, error) {
+	template := map[string]any{"spec": map[string]any{
+		"automountServiceAccountToken":  false,
+		"enableServiceLinks":            false,
+		"terminationGracePeriodSeconds": 0, // the job container's tail ignores SIGTERM
+	}}
+	for _, layer := range p.options.PodTemplates {
+		template, _ = mergeManifest(template, layer, "").(map[string]any)
+	}
+	templateSpec, _ := template["spec"].(map[string]any)
+	templateContainers, _ := templateSpec["containers"].([]any)
+	templateVolumes, _ := templateSpec["volumes"].([]any)
+	var serviceTemplate any
+	if index := slices.IndexFunc(templateContainers, func(container any) bool { return manifestField(container, "name") == "$services" }); index >= 0 {
+		serviceTemplate = templateContainers[index]
+		templateSpec["containers"] = slices.Delete(slices.Clone(templateContainers), index, index+1)
+	}
+	var containers, volumes []any
+	var hostnames []string
+	names := map[string]bool{}
+	for _, container := range templateContainers {
+		names[manifestField(container, "name")] = true
+	}
+	for _, c := range append([]*kubernetesContainer{p.job}, p.services...) {
+		if c != p.job && (c.name == "" || names[c.name]) {
+			return nil, fmt.Errorf("service %s maps to container %q, which is empty or named like another container of the pod", c.id, c.name)
+		}
+		names[c.name] = true
+		spec, err := c.spec(secret, secretData)
+		if err != nil {
+			return nil, err
+		}
+		if c == p.job {
+			containers = append(containers, spec)
+			continue
+		}
+		containers = append(containers, mergeManifest(serviceTemplate, spec, ""))
+		hostnames = append(hostnames, KubernetesServiceHostnames(c.id)...)
+	}
+	for _, name := range []string{"workspace", "act"} {
+		if !slices.ContainsFunc(templateVolumes, func(volume any) bool { return manifestField(volume, "name") == name }) {
+			volumes = append(volumes, map[string]any{"name": name, "emptyDir": map[string]any{}})
+		}
+	}
+	spec := map[string]any{"restartPolicy": "Never", "containers": containers, "volumes": volumes}
+	if p.transferHelper != "" {
+		transfer := map[string]any{
+			"name": "gitea-runner-transfer", "image": p.transferImage, "terminationMessagePolicy": "FallbackToLogsOnError",
+			"command":         []string{"gitea-runner", KubernetesTransferCommand, "install", p.transferHelper},
+			"volumeMounts":    []any{map[string]any{"name": "act", "mountPath": p.job.GetActPath()}},
+			"securityContext": map[string]any{"allowPrivilegeEscalation": false, "capabilities": map[string]any{"drop": []string{"ALL"}}},
+		}
+		if p.options.ForcePull {
+			transfer["imagePullPolicy"] = "Always"
+		}
+		spec["initContainers"] = []any{transfer}
+	}
+	if len(hostnames) > 0 {
+		spec["hostAliases"] = []any{map[string]any{"ip": "127.0.0.1", "hostnames": hostnames}}
+	}
+	if p.options.MaxLifetime > 0 {
+		spec["activeDeadlineSeconds"] = max(1, int64(p.options.MaxLifetime.Seconds()))
+	}
+	return mergeManifest(template, map[string]any{"apiVersion": "v1", "kind": "Pod", "metadata": metadata, "spec": spec}, ""), nil
+}
+
+// mergeManifest merges over onto base like a strategic merge patch: maps key by key, map list items by name or volumeMounts by mountPath, env entries, volumes and other values replaced.
+func mergeManifest(base, over any, field string) any {
+	switch over := over.(type) {
+	case map[string]any:
+		merged := map[string]any{}
+		if base, ok := base.(map[string]any); ok {
+			maps.Copy(merged, base)
+		}
+		for key, value := range over {
+			merged[key] = mergeManifest(merged[key], value, key)
+		}
+		return merged
+	case []any:
+		key := cmp.Or(map[string]string{"volumeMounts": "mountPath"}[field], "name")
+		baseList, _ := base.([]any)
+		merged := slices.Clone(baseList)
+		for _, item := range over {
+			if _, ok := item.(map[string]any); !ok {
+				return over
+			}
+			name := manifestField(item, key)
+			index := slices.IndexFunc(merged, func(existing any) bool { return name != "" && manifestField(existing, key) == name })
+			switch {
+			case index < 0:
+				merged = append(merged, item)
+			case field == "env" || field == "volumes": // each holds one source, merging two makes a pod the API rejects
+				merged[index] = item
+			default:
+				merged[index] = mergeManifest(merged[index], item, "")
+			}
+		}
+		return merged
+	}
+	return over
+}
+
+func manifestField(item any, key string) string {
+	fields, _ := item.(map[string]any)
+	value, _ := fields[key].(string)
+	return value
+}
+
+func (c *kubernetesContainer) spec(secret string, secretData map[string]string) (map[string]any, error) {
+	env := []any{}
+	for index, entry := range c.input.Env {
+		key, value, _ := strings.Cut(entry, "=")
+		if c == c.pod.job {
+			env = append(env, map[string]any{"name": key, "value": value})
+			continue
+		}
+		secretKey := fmt.Sprintf("%s.%d", c.name, index)
+		secretData[secretKey] = value
+		env = append(env, map[string]any{"name": key, "valueFrom": map[string]any{"secretKeyRef": map[string]any{"name": secret, "key": secretKey}}})
+	}
+	spec := map[string]any{
+		"name": c.name, "image": c.input.Image, "command": escapeExpansion(c.input.Entrypoint), "args": escapeExpansion(c.input.Cmd),
+		"workingDir": c.input.WorkingDir, "env": env,
+	}
+	if c.pod.options.ForcePull {
+		spec["imagePullPolicy"] = "Always"
+	}
+	if c == c.pod.job {
+		spec["volumeMounts"] = []any{
+			map[string]any{"name": "workspace", "mountPath": c.input.WorkingDir},
+			map[string]any{"name": "act", "mountPath": c.GetActPath()},
+		}
+	}
+	if err := c.parseOptions(); err != nil {
+		return nil, fmt.Errorf("service %s: %w", c.name, err)
+	}
+	if c.probe != nil {
+		spec["startupProbe"] = c.probe
+	}
+	return spec, nil
+}
+
+// escapeExpansion keeps kubelet from expanding $(VAR) and $$ in command and args, which docker passes as is.
+func escapeExpansion(args []string) []string {
+	args = slices.Clone(args)
+	for index := range args {
+		args[index] = strings.ReplaceAll(args[index], "$", "$$")
+	}
+	return args
+}
+
+// parseOptions turns docker health options, the only ones a pod supports, into a startup probe, which like docker gives up after the retries.
+func (c *kubernetesContainer) parseOptions() error {
+	args, err := shellquote.Split(c.input.WorkflowOptions)
+	if err != nil {
+		return err
+	}
+	flags := pflag.NewFlagSet("options", pflag.ContinueOnError)
+	flags.SetOutput(io.Discard)
+	command := flags.String("health-cmd", "", "")
+	interval := flags.Duration("health-interval", 0, "")
+	timeout := flags.Duration("health-timeout", 0, "")
+	retries := flags.Int("health-retries", 0, "")
+	startPeriod := flags.Duration("health-start-period", 0, "")
+	if err := flags.Parse(args); err != nil {
+		return fmt.Errorf("options %q: %w, only --health-* options are supported on Kubernetes", c.input.WorkflowOptions, err)
+	}
+	if *command == "" {
+		return nil
+	}
+	period := max(1, int(cmp.Or(*interval, 30*time.Second).Seconds()))
+	c.probe = map[string]any{
+		"exec":             map[string]any{"command": []string{"/bin/sh", "-c", *command}},
+		"periodSeconds":    period,
+		"timeoutSeconds":   max(1, int(cmp.Or(*timeout, 30*time.Second).Seconds())),
+		"failureThreshold": max(1, cmp.Or(*retries, 3)) + int(startPeriod.Seconds())/period, // docker does not count failures in the start period
+	}
+	return nil
+}
+
+func (p *KubernetesPod) get(ctx context.Context) (*podStatus, error) {
+	var pod podStatus
+	return &pod, p.client.do(ctx, http.MethodGet, p.client.path("pods/"+p.name), nil, &pod)
+}
+
+func (p *KubernetesPod) waitStarted(ctx context.Context) error {
+	var unscheduled string
+	for delay := 100 * time.Millisecond; ; delay = min(2*delay, time.Second) {
+		pod, err := p.get(ctx)
+		if err != nil {
+			return err
+		}
+		if pod.Status.Phase == "Failed" {
+			reason := cmp.Or(pod.Status.Message, pod.Status.Reason)
+			for _, status := range append(pod.Status.InitContainerStatuses, pod.Status.ContainerStatuses...) {
+				if terminated := status.State.Terminated; reason == "" && terminated != nil && terminated.ExitCode != 0 {
+					reason = fmt.Sprintf("container %s exited with %d: %s", status.Name, terminated.ExitCode, strings.TrimSpace(terminated.Message))
+				}
+			}
+			return fmt.Errorf("pod %s failed: %s", p.name, reason)
+		}
+		started := len(pod.Status.ContainerStatuses) == len(pod.Spec.Containers)
+		for _, status := range append(pod.Status.InitContainerStatuses, pod.Status.ContainerStatuses...) {
+			if waiting := status.State.Waiting; waiting != nil {
+				switch waiting.Reason {
+				case "ErrImagePull", "ImagePullBackOff", "InvalidImageName", "ErrImageNeverPull", "CreateContainerConfigError", "CreateContainerError", "RunContainerError":
+					return fmt.Errorf("container %s of pod %s: %s: %s", status.Name, p.name, waiting.Reason, waiting.Message)
+				}
+				started = false
+			}
+		}
+		if started {
+			for _, ip := range pod.Status.PodIPs {
+				p.ips = append(p.ips, net.ParseIP(ip.IP))
+			}
+			return nil
+		}
+		for _, condition := range pod.Status.Conditions {
+			if condition.Type == "PodScheduled" && condition.Status == "False" && condition.Message != unscheduled {
+				unscheduled = condition.Message
+				common.Logger(ctx).Infof("Waiting for pod %s to be scheduled: %s", p.name, unscheduled)
+			}
+		}
+		select {
+		case <-ctx.Done():
+			return ctx.Err()
+		case <-time.After(delay):
+		}
+	}
+}
+
+func (c *kubernetesContainer) Create(_, _ []string) common.Executor {
+	return func(ctx context.Context) error {
+		if c != c.pod.job {
+			return nil
+		}
+		return c.pod.create(ctx)
+	}
+}
+
+func (c *kubernetesContainer) Start(_ bool) common.Executor {
+	return func(ctx context.Context) error {
+		if c != c.pod.job {
+			return nil
+		}
+		if err := c.pod.waitStarted(ctx); err != nil {
+			return err
+		}
+		output, err := c.pod.probe(ctx, c.name)
+		if err != nil {
+			return err
+		}
+		probed := strings.SplitN(output, "\n", 3)
+		for len(probed) < 3 {
+			probed = append(probed, "")
+		}
+		c.pod.arch, c.gzip, c.pod.path = goArchToActionArch(probed[0]), probed[1] == "gzip", probed[2]
+		return nil
+	}
+}
+
+// probe retries exec while it fails short of the container, as a new node runs pods before its kubelet has a serving certificate.
+func (p *KubernetesPod) probe(ctx context.Context, container string) (string, error) {
+	var failure string
+	deadline := time.Now().Add(time.Minute)
+	for delay := 100 * time.Millisecond; ; delay = min(2*delay, 2*time.Second) {
+		var stdout bytes.Buffer
+		err := p.client.exec(ctx, p.name, container, []string{"sh", "-c", `printf '%s\n%s\n%s' "$(uname -m)" "$(command -v gzip >/dev/null && echo gzip)" "$PATH"`}, nil, &stdout, io.Discard)
+		var exitErr ExitCodeError
+		var apiErr *apiError
+		if err == nil || ctx.Err() != nil || errors.As(err, &exitErr) || time.Now().After(deadline) ||
+			errors.As(err, &apiErr) && apiErr.code < http.StatusInternalServerError {
+			return stdout.String(), err
+		}
+		if err.Error() != failure {
+			failure = err.Error()
+			common.Logger(ctx).Infof("Waiting for exec into pod %s: %v", p.name, err)
+		}
+		select {
+		case <-ctx.Done():
+			return "", ctx.Err()
+		case <-time.After(delay):
+		}
+	}
+}
+
+func (*kubernetesContainer) Pull(bool) common.Executor {
+	return func(context.Context) error { return nil }
+}
+
+var (
+	shellName    = regexp.MustCompile(`^[A-Za-z_][A-Za-z0-9_]*$`)
+	bashReadonly = []string{"BASHOPTS", "BASH_VERSINFO", "EUID", "PPID", "SHELLOPTS", "UID"} // bash as sh cannot export these
+)
+
+// Exec feeds the command to sh on stdin, which exports the env so it stays out of the request URL and, where sh can export a name, out of process arguments.
+func (c *kubernetesContainer) Exec(command []string, env map[string]string, _, workdir string) common.Executor {
+	return func(ctx context.Context) error {
+		script, args := "", []string{"env", "--"}
+		for name, value := range env {
+			if shellName.MatchString(name) && !slices.Contains(bashReadonly, name) {
+				script += "command export " + shellquote.Join(name+"="+value) + "\n"
+			} else {
+				args = append(args, name+"="+value)
+			}
+		}
+		script += "exec " + shellquote.Join(append(args, command...)...)
+		if workdir != "" {
+			script = "cd " + shellquote.Join(workdir) + " || exit\n" + script
+		}
+		defer common.FlushWriter(c.input.Stdout)
+		defer common.FlushWriter(c.input.Stderr)
+		return c.pod.client.exec(ctx, c.pod.name, c.name, []string{"sh"}, strings.NewReader(script), c.input.Stdout, c.input.Stderr)
+	}
+}
+
+// compressCopyMin is the size from which Copy compresses and uses the transfer helper: below it that saves next to nothing on the wire and costs a process in the pod.
+const compressCopyMin = 64 << 10
+
+// extract streams the tar write produces into destPath, gzipped with compress, as copied actions shrink about fivefold and API server traffic often crosses zones.
+func (c *kubernetesContainer) extract(ctx context.Context, destPath string, compress bool, write func(io.Writer) error) error {
+	if compress && c.pod.transferHelper != "" {
+		request, done := c.pod.transfer.offer(c.pod.ips, write)
+		stdin, _ := json.Marshal(request)
+		var stderr bytes.Buffer
+		err := c.pod.client.exec(ctx, c.pod.name, c.name, []string{c.pod.transferHelper, KubernetesTransferCommand, "fetch", destPath}, bytes.NewReader(stdin), io.Discard, &stderr)
+		taken, writeErr := done()
+		if err == nil || ctx.Err() != nil {
+			return err
+		}
+		if taken || !c.pod.options.Transfer.Fallback {
+			return fmt.Errorf("copy to %s over the pod network: %w: %s", destPath, errors.Join(writeErr, err), strings.TrimSpace(stderr.String()))
+		}
+		c.pod.transferHelper = "" // a pod that cannot reach the runner once will not later
+		logging.Warnf("Copying into pod %s over the pod network failed, copying through the API server instead: %v: %s", c.pod.name, err, strings.TrimSpace(stderr.String()))
+	}
+	compress = compress && c.gzip
+	reader, writer := io.Pipe()
+	defer reader.Close()
+	go func() {
+		if compress {
+			writer.CloseWithError(writeGzip(writer, write))
+		} else {
+			writer.CloseWithError(write(writer))
+		}
+	}()
+	script := `mkdir -p "$1" && tar -xf - -C "$1"`
+	if compress {
+		script = `mkdir -p "$1" && gzip -dc | tar -xf - -C "$1"` // gzip -dc rather than tar -z, which GNU tar runs gzip for anyway
+	}
+	var stderr bytes.Buffer
+	if err := c.pod.client.exec(ctx, c.pod.name, c.name, []string{"sh", "-c", script, "sh", destPath}, reader, io.Discard, &stderr); err != nil {
+		return fmt.Errorf("extract to %s: %w: %s", destPath, err, strings.TrimSpace(stderr.String()))
+	}
+	return nil
+}
+
+// writeGzip gzips what write produces into w, at a level fast enough to not slow copies down and nearly as small as the default.
+func writeGzip(w io.Writer, write func(io.Writer) error) error {
+	compressed, _ := gzip.NewWriterLevel(w, gzip.BestSpeed)
+	return errors.Join(write(compressed), compressed.Close())
+}
+
+func (c *kubernetesContainer) Copy(destPath string, files ...*FileEntry) common.Executor {
+	return func(ctx context.Context) error {
+		size := 0
+		for _, file := range files {
+			size += len(file.Body)
+		}
+		return c.extract(ctx, destPath, size >= compressCopyMin, func(writer io.Writer) error { return writeFilesTar(ctx, writer, 0, 0, files...) })
+	}
+}
+
+func (c *kubernetesContainer) CopyDir(destPath, srcPath string, useGitIgnore, skipGitDir bool) common.Executor {
+	return func(ctx context.Context) error {
+		return c.extract(ctx, destPath, true, func(writer io.Writer) error { // directories are actions and workspaces, megabytes of compressible sources
+			return writeDirTar(ctx, writer, "/", srcPath, useGitIgnore, skipGitDir, 0, 0, hostOS == "windows")
+		})
+	}
+}
+
+// GetContainerArchive streams the archive, checking the path first as tar writes an empty archive for a missing one.
+func (c *kubernetesContainer) GetContainerArchive(ctx context.Context, srcPath string) (io.ReadCloser, error) {
+	reader, writer := io.Pipe()
+	go func() {
+		var stderr bytes.Buffer
+		err := c.pod.client.exec(ctx, c.pod.name, c.name, []string{"sh", "-c", `test -e "$1" -o -L "$1" && exec tar -cf - -C "$2" "$3"`, "sh", srcPath, path.Dir(srcPath), path.Base(srcPath)}, nil, writer, &stderr)
+		if err != nil {
+			err = fmt.Errorf("archive %s: %w: %s", srcPath, err, strings.TrimSpace(stderr.String()))
+		}
+		writer.CloseWithError(err)
+	}()
+	buffered := bufio.NewReader(reader)
+	if _, err := buffered.Peek(1); err != nil {
+		reader.Close()
+		return nil, err
+	}
+	return struct {
+		io.Reader
+		io.Closer
+	}{buffered, reader}, nil
+}
+
+func (c *kubernetesContainer) UpdateFromEnv(srcPath string, env *map[string]string) common.Executor {
+	return parseEnvFile(c, srcPath, env, false)
+}
+
+func (c *kubernetesContainer) UpdateFromImageEnv(env *map[string]string) common.Executor {
+	return func(context.Context) error {
+		(*env)["PATH"] = cmp.Or((*env)["PATH"], c.pod.path)
+		return nil
+	}
+}
+
+func (c *kubernetesContainer) Inspect(ctx context.Context) (*Info, error) {
+	if c.pod.name == "" {
+		return nil, fmt.Errorf("container %s %w", c.name, ErrContainerNotFound)
+	}
+	pod, err := c.pod.get(ctx)
+	if isNotFound(err) {
+		return nil, fmt.Errorf("pod %s %w", c.pod.name, ErrContainerNotFound)
+	} else if err != nil {
+		return nil, err
+	}
+	info := &Info{ID: c.pod.name + "/" + c.name, State: "created", Health: HealthNone, Ports: map[string]string{}}
+	for port := range c.input.ExposedPorts {
+		info.Ports[port.Port()] = port.Port() // services share the pod's network
+	}
+	for _, status := range pod.Status.ContainerStatuses {
+		if status.Name != c.name {
+			continue
+		}
+		if status.State.Running != nil {
+			info.State = StateRunning
+		} else if terminated := status.State.Terminated; terminated != nil {
+			info.State, info.ExitCode, info.HealthOutput = "exited", terminated.ExitCode, terminated.Message
+		}
+		if c.probe != nil {
+			switch {
+			case status.Ready:
+				info.Health = HealthHealthy
+			case info.State == "exited":
+				info.Health = HealthUnhealthy
+			default:
+				info.Health = HealthStarting
+			}
+		}
+	}
+	return info, nil
+}
+
+func (c *kubernetesContainer) DumpLogs(ctx context.Context) error {
+	if c.pod.name == "" {
+		return fmt.Errorf("container %s %w", c.name, ErrContainerNotFound)
+	}
+	defer common.FlushWriter(c.input.Stdout)
+	return c.pod.client.do(ctx, http.MethodGet, c.pod.client.path("pods/"+c.pod.name+"/log?container="+c.name), nil, c.input.Stdout)
+}
+
+func (c *kubernetesContainer) Remove() common.Executor {
+	return func(ctx context.Context) error {
+		if c != c.pod.job {
+			return nil
+		}
+		return errors.Join(c.pod.client.delete(ctx, "pods", c.pod.name), c.pod.client.delete(ctx, "secrets", c.pod.secretName))
+	}
+}
+
+// RemoveOrphanKubernetesResources removes this runner's job pods created before createdBefore and the Secrets named like them, as listing Secrets would reveal all of the namespace's.
+func RemoveOrphanKubernetesResources(ctx context.Context, options KubernetesOptions, createdBefore time.Time) error {
+	client, err := newKubeClient(options.Kubeconfig, options.Namespace)
+	if err != nil {
+		return fmt.Errorf("connect to Kubernetes: %w", err)
+	}
+	defer client.http.CloseIdleConnections()
+	var pods struct {
+		Items []struct {
+			Metadata struct {
+				Name              string
+				CreationTimestamp time.Time
+			}
+		}
+	}
+	if err := client.do(ctx, http.MethodGet, client.path("pods?labelSelector="+url.QueryEscape(runnerUUIDLabel+"="+options.RunnerUUID)), nil, &pods); err != nil {
+		return fmt.Errorf("list pods: %w", err)
+	}
+	var errs []error
+	for _, item := range pods.Items {
+		if !item.Metadata.CreationTimestamp.Before(createdBefore) {
+			continue
+		}
+		if err := client.delete(ctx, "secrets", item.Metadata.Name); err != nil {
+			errs = append(errs, err) // leave the pod for the next cleanup, it is the only way back to its Secret
+			continue
+		}
+		errs = append(errs, client.delete(ctx, "pods", item.Metadata.Name))
+	}
+	return errors.Join(errs...)
+}
+
+func (c *kubernetesContainer) Close() common.Executor {
+	return func(context.Context) error {
+		c.pod.client.http.CloseIdleConnections()
+		return nil
+	}
+}
+
+func (c *kubernetesContainer) ReplaceLogWriter(stdout, stderr io.Writer) (io.Writer, io.Writer) {
+	oldStdout, oldStderr := c.input.Stdout, c.input.Stderr
+	c.input.Stdout, c.input.Stderr = stdout, stderr
+	return oldStdout, oldStderr
+}
+
+func (c *kubernetesContainer) GetRunnerContext(_ context.Context) map[string]any {
+	return map[string]any{"os": "Linux", "arch": c.pod.arch, "temp": "/tmp", "tool_cache": DefaultToolCache}
+}

act/container/kubernetes_client.go

@@ -0,0 +1,400 @@
+// Copyright 2026 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package container
+
+import (
+	"bytes"
+	"cmp"
+	"context"
+	"crypto/tls"
+	"crypto/x509"
+	"encoding/base64"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"net"
+	"net/http"
+	"net/url"
+	"os"
+	"path/filepath"
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/coder/websocket"
+	"go.yaml.in/yaml/v4"
+)
+
+const (
+	serviceAccountDir = "/var/run/secrets/kubernetes.io/serviceaccount"
+	execProtocol      = "v5.channel.k8s.io"
+)
+
+type kubeClient struct {
+	server, namespace, token string
+	tokenFile                string // re-read on every request, service account tokens rotate
+	inCluster                bool
+	http                     *http.Client
+}
+
+type apiError struct {
+	code    int
+	message string
+}
+
+func (e *apiError) Error() string { return e.message }
+
+func isNotFound(err error) bool {
+	var apiErr *apiError
+	return errors.As(err, &apiErr) && apiErr.code == http.StatusNotFound
+}
+
+func newKubeClient(kubeconfig, namespace string) (*kubeClient, error) {
+	client := &kubeClient{namespace: namespace}
+	transport := &http.Transport{Proxy: http.ProxyFromEnvironment, TLSClientConfig: &tls.Config{MinVersion: tls.VersionTLS12}}
+	if host := os.Getenv("KUBERNETES_SERVICE_HOST"); host != "" && kubeconfig == "" {
+		if err := client.loadInCluster(host, transport.TLSClientConfig); err != nil {
+			return nil, err
+		}
+	} else if err := client.loadKubeconfig(kubeconfig, transport); err != nil {
+		return nil, err
+	}
+	client.http = &http.Client{Transport: transport}
+	return client, nil
+}
+
+func (c *kubeClient) loadInCluster(host string, tlsConfig *tls.Config) error {
+	c.server = "https://" + net.JoinHostPort(host, os.Getenv("KUBERNETES_SERVICE_PORT"))
+	c.tokenFile = serviceAccountDir + "/token"
+	ca, err := os.ReadFile(serviceAccountDir + "/ca.crt")
+	if err != nil {
+		return err
+	}
+	tlsConfig.RootCAs = x509.NewCertPool()
+	tlsConfig.RootCAs.AppendCertsFromPEM(ca)
+	if c.namespace == "" {
+		namespace, err := os.ReadFile(serviceAccountDir + "/namespace")
+		if err != nil {
+			return err
+		}
+		c.namespace = strings.TrimSpace(string(namespace))
+	}
+	c.inCluster = true
+	return nil
+}
+
+func (c *kubeClient) loadKubeconfig(path string, transport *http.Transport) error {
+	if paths := filepath.SplitList(os.Getenv("KUBECONFIG")); path == "" && len(paths) > 0 {
+		path = paths[0]
+	}
+	if path == "" {
+		home, err := os.UserHomeDir()
+		if err != nil {
+			return err
+		}
+		path = filepath.Join(home, ".kube", "config")
+	}
+	content, err := os.ReadFile(path)
+	if err != nil {
+		return fmt.Errorf("no in-cluster service account and no kubeconfig: %w", err)
+	}
+	var config struct {
+		CurrentContext string `yaml:"current-context"`
+		Contexts       []struct {
+			Name    string
+			Context struct{ Cluster, User, Namespace string }
+		}
+		Clusters []struct {
+			Name    string
+			Cluster struct {
+				Server                   string
+				TLSServerName            string `yaml:"tls-server-name"`
+				InsecureSkipTLSVerify    bool   `yaml:"insecure-skip-tls-verify"`
+				ProxyURL                 string `yaml:"proxy-url"`
+				CertificateAuthority     string `yaml:"certificate-authority"`
+				CertificateAuthorityData string `yaml:"certificate-authority-data"`
+			}
+		}
+		Users []struct {
+			Name string
+			User struct {
+				Token                 string
+				TokenFile             string `yaml:"tokenFile"`
+				ClientCertificate     string `yaml:"client-certificate"`
+				ClientCertificateData string `yaml:"client-certificate-data"`
+				ClientKey             string `yaml:"client-key"`
+				ClientKeyData         string `yaml:"client-key-data"`
+				Exec                  any
+				AuthProvider          any `yaml:"auth-provider"`
+			}
+		}
+	}
+	if err := yaml.Unmarshal(content, &config); err != nil {
+		return fmt.Errorf("parse kubeconfig %s: %w", path, err)
+	}
+	var current struct{ Cluster, User, Namespace string }
+	for _, entry := range config.Contexts {
+		if entry.Name == config.CurrentContext {
+			current = entry.Context
+		}
+	}
+	if current.Cluster == "" {
+		return fmt.Errorf("kubeconfig %s has no current context", path)
+	}
+	c.namespace = cmp.Or(c.namespace, current.Namespace, "default")
+
+	resolve := func(file string) string {
+		if file == "" || filepath.IsAbs(file) {
+			return file
+		}
+		return filepath.Join(filepath.Dir(path), file)
+	}
+	read := func(data, file string) ([]byte, error) {
+		if data != "" {
+			return base64.StdEncoding.DecodeString(data)
+		}
+		if file == "" {
+			return nil, nil
+		}
+		return os.ReadFile(resolve(file))
+	}
+
+	tlsConfig := transport.TLSClientConfig
+	for _, cluster := range config.Clusters {
+		if cluster.Name != current.Cluster {
+			continue
+		}
+		c.server = strings.TrimSuffix(cluster.Cluster.Server, "/")
+		tlsConfig.ServerName, tlsConfig.InsecureSkipVerify = cluster.Cluster.TLSServerName, cluster.Cluster.InsecureSkipTLSVerify
+		if cluster.Cluster.ProxyURL != "" {
+			proxy, err := url.Parse(cluster.Cluster.ProxyURL)
+			if err != nil {
+				return fmt.Errorf("kubeconfig %s: %w", path, err)
+			}
+			transport.Proxy = http.ProxyURL(proxy)
+		}
+		ca, err := read(cluster.Cluster.CertificateAuthorityData, cluster.Cluster.CertificateAuthority)
+		if err != nil {
+			return err
+		}
+		if ca != nil {
+			tlsConfig.RootCAs = x509.NewCertPool()
+			tlsConfig.RootCAs.AppendCertsFromPEM(ca)
+		}
+	}
+	for _, user := range config.Users {
+		if user.Name != current.User {
+			continue
+		}
+		if user.User.Exec != nil || user.User.AuthProvider != nil {
+			return fmt.Errorf("kubeconfig %s: user %q authenticates through a credential plugin, which the runner does not support, use a token or client certificate", path, user.Name)
+		}
+		c.token, c.tokenFile = user.User.Token, resolve(user.User.TokenFile)
+		cert, err := read(user.User.ClientCertificateData, user.User.ClientCertificate)
+		if err != nil {
+			return err
+		}
+		key, err := read(user.User.ClientKeyData, user.User.ClientKey)
+		if err != nil {
+			return err
+		}
+		if cert != nil {
+			pair, err := tls.X509KeyPair(cert, key)
+			if err != nil {
+				return err
+			}
+			tlsConfig.Certificates = []tls.Certificate{pair}
+		}
+	}
+	if c.server == "" {
+		return fmt.Errorf("kubeconfig %s names no server for context %q", path, config.CurrentContext)
+	}
+	return nil
+}
+
+func (c *kubeClient) authorize(header http.Header) error {
+	token := c.token
+	if c.tokenFile != "" {
+		content, err := os.ReadFile(c.tokenFile)
+		if err != nil {
+			return err
+		}
+		token = strings.TrimSpace(string(content))
+	}
+	if token != "" {
+		header.Set("Authorization", "Bearer "+token)
+	}
+	return nil
+}
+
+func (c *kubeClient) path(resource string) string {
+	return "/api/v1/namespaces/" + c.namespace + "/" + resource
+}
+
+func (c *kubeClient) do(ctx context.Context, method, path string, in, out any) error {
+	var body io.Reader
+	if in != nil {
+		content, err := json.Marshal(in)
+		if err != nil {
+			return err
+		}
+		body = bytes.NewReader(content)
+	}
+	req, err := http.NewRequestWithContext(ctx, method, c.server+path, body)
+	if err != nil {
+		return err
+	}
+	if err := c.authorize(req.Header); err != nil {
+		return err
+	}
+	req.Header.Set("Content-Type", "application/json")
+	resp, err := c.http.Do(req)
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+	if resp.StatusCode >= http.StatusMultipleChoices {
+		return statusError(resp)
+	}
+	if out == nil {
+		out = io.Discard // draining lets the connection be reused
+	}
+	if writer, ok := out.(io.Writer); ok {
+		_, err = io.Copy(writer, resp.Body)
+		return err
+	}
+	return json.NewDecoder(resp.Body).Decode(out)
+}
+
+func (c *kubeClient) delete(ctx context.Context, resource, name string) error {
+	if name == "" {
+		return nil
+	}
+	if err := c.do(ctx, http.MethodDelete, c.path(resource+"/"+name), nil, nil); err != nil && !isNotFound(err) {
+		return fmt.Errorf("delete %s %s: %w", resource, name, err)
+	}
+	return nil
+}
+
+func statusError(resp *http.Response) error {
+	content, _ := io.ReadAll(resp.Body)
+	var status struct{ Message string }
+	if json.Unmarshal(content, &status) != nil || status.Message == "" {
+		status.Message = strings.TrimSpace(string(content))
+	}
+	return &apiError{code: resp.StatusCode, message: status.Message}
+}
+
+func (c *kubeClient) exec(ctx context.Context, pod, containerName string, command []string, stdin io.Reader, stdout, stderr io.Writer) error {
+	query := url.Values{"container": {containerName}, "command": command, "stdout": {"true"}, "stderr": {"true"}}
+	if stdin != nil {
+		query.Set("stdin", "true")
+	}
+	header := http.Header{}
+	if err := c.authorize(header); err != nil {
+		return err
+	}
+	ctx, cancel := context.WithCancelCause(ctx)
+	defer cancel(nil)
+	conn, resp, err := websocket.Dial(ctx, c.server+c.path("pods/"+pod+"/exec?")+query.Encode(), &websocket.DialOptions{
+		HTTPClient:   c.http,
+		HTTPHeader:   header,
+		Subprotocols: []string{execProtocol},
+	})
+	if err != nil {
+		if resp != nil && resp.StatusCode >= http.StatusMultipleChoices {
+			defer resp.Body.Close()
+			err = statusError(resp)
+		}
+		return fmt.Errorf("exec in pod %s: %w", pod, err)
+	}
+	defer func() { _ = conn.CloseNow() }()
+	if conn.Subprotocol() != execProtocol {
+		return fmt.Errorf("the Kubernetes API server does not speak %s, which needs Kubernetes 1.30 or later", execProtocol)
+	}
+	conn.SetReadLimit(-1)
+
+	if stdin != nil {
+		go func() {
+			if err := sendStdin(ctx, conn, stdin); err != nil {
+				cancel(err)
+			}
+		}()
+	}
+	go func() {
+		ticker := time.NewTicker(5 * time.Second)
+		defer ticker.Stop()
+		for {
+			select {
+			case <-ctx.Done():
+				return
+			case <-ticker.C:
+				if conn.Ping(ctx) != nil {
+					return
+				}
+			}
+		}
+	}()
+
+	for {
+		_, frame, err := conn.Read(ctx)
+		if err != nil {
+			return cmp.Or(context.Cause(ctx), fmt.Errorf("exec in pod %s ended without an exit status: %w", pod, err))
+		}
+		if len(frame) < 2 {
+			continue
+		}
+		switch frame[0] {
+		case 1:
+			_, err = stdout.Write(frame[1:])
+		case 2:
+			_, err = stderr.Write(frame[1:])
+		case 3:
+			return cmp.Or(context.Cause(ctx), execStatus(frame[1:]))
+		}
+		if err != nil {
+			return err
+		}
+	}
+}
+
+func sendStdin(ctx context.Context, conn *websocket.Conn, stdin io.Reader) error {
+	frame := make([]byte, 1+32*1024) // frame[0] is the stdin channel, 0
+	for {
+		n, err := stdin.Read(frame[1:])
+		if n > 0 {
+			if err := conn.Write(ctx, websocket.MessageBinary, frame[:1+n]); err != nil {
+				return err
+			}
+		}
+		if errors.Is(err, io.EOF) {
+			return conn.Write(ctx, websocket.MessageBinary, []byte{255, 0}) // v5 close signal for stdin
+		}
+		if err != nil {
+			return err
+		}
+	}
+}
+
+func execStatus(content []byte) error {
+	var status struct {
+		Status, Message string
+		Details         struct {
+			Causes []struct{ Reason, Message string }
+		}
+	}
+	if err := json.Unmarshal(content, &status); err != nil {
+		return fmt.Errorf("decode exec status: %w", err)
+	}
+	if status.Status == "Success" {
+		return nil
+	}
+	for _, cause := range status.Details.Causes {
+		if code, err := strconv.Atoi(cause.Message); cause.Reason == "ExitCode" && err == nil {
+			return ExitCodeError(code)
+		}
+	}
+	return fmt.Errorf("exec failed: %s", status.Message)
+}

act/container/kubernetes_test.go

@@ -0,0 +1,423 @@
+// Copyright 2026 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package container
+
+import (
+	"archive/tar"
+	"bytes"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"net/http"
+	"net/http/httptest"
+	"net/url"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"runtime"
+	"strings"
+	"sync"
+	"testing"
+	"time"
+
+	"github.com/coder/websocket"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+type podManifest struct {
+	Metadata struct{ Labels map[string]string }
+	Spec     struct {
+		AutomountServiceAccountToken bool
+		EnableServiceLinks           bool
+		HostAliases                  []struct{ Hostnames []string }
+		Volumes                      []map[string]any
+		Containers                   []struct {
+			Name, ImagePullPolicy string
+			Resources             map[string]any
+			StartupProbe          *struct{ PeriodSeconds, TimeoutSeconds, FailureThreshold int }
+		}
+	}
+}
+
+type fakeCluster struct {
+	mu           sync.Mutex
+	requests     map[string][]string
+	execFailures []http.HandlerFunc
+}
+
+func (f *fakeCluster) record(request, content string) {
+	f.mu.Lock()
+	defer f.mu.Unlock()
+	f.requests[request] = append(f.requests[request], content)
+}
+
+func (f *fakeCluster) failExec(failures ...http.HandlerFunc) {
+	f.mu.Lock()
+	defer f.mu.Unlock()
+	f.execFailures = failures
+}
+
+func (f *fakeCluster) nextExecFailure() http.HandlerFunc {
+	f.mu.Lock()
+	defer f.mu.Unlock()
+	if len(f.execFailures) == 0 {
+		return nil
+	}
+	failure := f.execFailures[0]
+	f.execFailures = f.execFailures[1:]
+	return failure
+}
+
+// execFailure answers like the API server, code 0 for a failure reported after the websocket upgrade.
+func execFailure(t *testing.T, code int, status string) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		if code != 0 {
+			w.WriteHeader(code)
+			_, _ = io.WriteString(w, status)
+			return
+		}
+		conn, err := websocket.Accept(w, r, &websocket.AcceptOptions{Subprotocols: []string{execProtocol}})
+		if err != nil {
+			t.Error(err)
+			return
+		}
+		defer func() { _ = conn.CloseNow() }()
+		_ = conn.Write(r.Context(), websocket.MessageBinary, append([]byte{3}, status...))
+	}
+}
+
+func fakeKubernetes(t *testing.T, podStatus string, env ...string) (string, *fakeCluster) {
+	cluster := &fakeCluster{requests: map[string][]string{}}
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.Header.Get("Authorization") != "Bearer test-token" {
+			w.WriteHeader(http.StatusUnauthorized)
+			return
+		}
+		body, err := io.ReadAll(r.Body)
+		assert.NoError(t, err)
+		cluster.record(r.Method+" "+r.URL.Path, string(body))
+		pods, secrets := "/api/v1/namespaces/ci/pods", "/api/v1/namespaces/ci/secrets"
+		switch {
+		case r.Method == http.MethodGet && r.URL.Path == pods:
+			cluster.record("list", r.URL.Query().Get("labelSelector"))
+			_, _ = io.WriteString(w, `{"items":[{"metadata":{"name":"old","creationTimestamp":"2020-01-01T00:00:00Z"}},{"metadata":{"name":"new","creationTimestamp":"2999-01-01T00:00:00Z"}}]}`)
+		case strings.HasSuffix(r.URL.Path, "/exec"):
+			cluster.record("exec", r.URL.RawQuery)
+			if failure := cluster.nextExecFailure(); failure != nil {
+				failure(w, r)
+			} else {
+				serveLocalExec(t, w, r, env)
+			}
+		case strings.HasSuffix(r.URL.Path, "/log"):
+			_, _ = io.WriteString(w, "log of "+r.URL.Query().Get("container"))
+		case r.Method == http.MethodGet && strings.HasPrefix(r.URL.Path, pods+"/"):
+			_, _ = io.WriteString(w, podStatus)
+		case r.Method == http.MethodPost && (r.URL.Path == pods || r.URL.Path == secrets), r.Method == http.MethodDelete:
+		default:
+			w.WriteHeader(http.StatusNotFound)
+		}
+	}))
+	t.Cleanup(server.Close)
+	kubeconfig := filepath.Join(t.TempDir(), "kubeconfig")
+	require.NoError(t, os.WriteFile(filepath.Join(filepath.Dir(kubeconfig), "token"), []byte("test-token\n"), 0o600))
+	require.NoError(t, os.WriteFile(kubeconfig, fmt.Appendf(nil, `
+current-context: test
+contexts: [{name: test, context: {cluster: test, user: test, namespace: ci}}]
+clusters: [{name: test, cluster: {server: "http://kubernetes.invalid", proxy-url: %q}}]
+users: [{name: test, user: {tokenFile: token}}]
+`, server.URL), 0o600))
+	return kubeconfig, cluster
+}
+
+func serveLocalExec(t *testing.T, w http.ResponseWriter, r *http.Request, env []string) {
+	conn, err := websocket.Accept(w, r, &websocket.AcceptOptions{Subprotocols: []string{execProtocol}})
+	if err != nil {
+		t.Error(err)
+		return
+	}
+	defer func() { _ = conn.CloseNow() }()
+	conn.SetReadLimit(-1)
+	command := r.URL.Query()["command"]
+	var stdin bytes.Buffer
+	for r.URL.Query().Get("stdin") == "true" {
+		_, frame, err := conn.Read(r.Context())
+		if err != nil {
+			t.Error(err)
+			return
+		}
+		if frame[0] == 255 {
+			break
+		}
+		stdin.Write(frame[1:])
+	}
+	cmd := exec.Command(command[0], command[1:]...)
+	cmd.Env = append(append(os.Environ(), "COPYFILE_DISABLE=1"), env...)
+	var stdout, stderr bytes.Buffer
+	cmd.Stdin, cmd.Stdout, cmd.Stderr = &stdin, &stdout, &stderr
+	status := `{"status":"Success"}`
+	var exitErr *exec.ExitError
+	if err := cmd.Run(); errors.As(err, &exitErr) {
+		status = fmt.Sprintf(`{"status":"Failure","reason":"NonZeroExitCode","details":{"causes":[{"reason":"ExitCode","message":"%d"}]}}`, exitErr.ExitCode())
+	} else {
+		assert.NoError(t, err)
+	}
+	for _, frame := range [][]byte{append([]byte{1}, stdout.Bytes()...), append([]byte{2}, stderr.Bytes()...), append([]byte{3}, status...)} {
+		_ = conn.Write(r.Context(), websocket.MessageBinary, frame)
+	}
+}
+
+func TestKubernetesServiceHostnames(t *testing.T) {
+	for id, hostnames := range map[string][]string{
+		"db":                             {"db"},
+		"My_DB":                          {"my-db"},
+		"devstoreaccount1.azurite.local": {"devstoreaccount1-azurite-local", "devstoreaccount1.azurite.local"},
+		"DB.Local":                       {"db-local", "db.local"},
+		strings.Repeat("a", 64):          {strings.Repeat("a", 63), strings.Repeat("a", 64)},
+		strings.Repeat("a", 254):         {strings.Repeat("a", 63)},
+	} {
+		assert.Equal(t, hostnames, KubernetesServiceHostnames(id), id)
+	}
+}
+
+func TestKubernetesPodRunsJobThroughAPI(t *testing.T) {
+	t.Parallel()
+	if runtime.GOOS == "windows" {
+		t.Skip("uses POSIX shell")
+	}
+	ctx := t.Context()
+	workdir, err := filepath.EvalSymlinks(t.TempDir())
+	require.NoError(t, err)
+	path := workdir + ":" + os.Getenv("PATH")
+	kubeconfig, cluster := fakeKubernetes(t, `{"spec":{"containers":[{},{}]},"status":{"phase":"Running","containerStatuses":[
+		{"name":"job","ready":true,"state":{"running":{}}},
+		{"name":"my-db","ready":true,"state":{"running":{}}}]}}`, "PATH="+path)
+	options := KubernetesOptions{Kubeconfig: kubeconfig, RunnerUUID: "runner-uuid", PodTemplates: []map[string]any{
+		{"spec": map[string]any{
+			"automountServiceAccountToken": true,
+			"containers": []any{
+				map[string]any{"name": "job", "resources": map[string]any{"limits": map[string]any{"cpu": "2"}}},
+				map[string]any{
+					"name": "$services", "imagePullPolicy": "Always", "resources": map[string]any{"limits": map[string]any{"memory": "256Mi"}},
+					"env": []any{map[string]any{"name": "POSTGRES_PASSWORD", "value": "template"}},
+				},
+			},
+		}},
+		{"spec": map[string]any{
+			"volumes":    []any{map[string]any{"name": "workspace", "emptyDir": map[string]any{"sizeLimit": "1Gi"}}},
+			"containers": []any{map[string]any{"name": "job", "resources": map[string]any{"limits": map[string]any{"memory": "1Gi"}}}},
+		}},
+	}}
+	pod, err := NewKubernetesPod(options)
+	require.NoError(t, err)
+	var jobLog, serviceLog bytes.Buffer
+	job := pod.JobContainer(&NewContainerInput{Name: "Job-Name", Image: "node", WorkingDir: workdir, Stdout: &jobLog, Stderr: &jobLog})
+	service := pod.ServiceContainer("My_DB", &NewContainerInput{
+		Image:           "postgres",
+		Cmd:             []string{"postgres", "-D", "$(PGDATA)"},
+		Env:             []string{"POSTGRES_PASSWORD=service-secret"},
+		WorkflowOptions: "--health-cmd pg_isready --health-interval 2s --health-start-period 4s",
+		Stdout:          &serviceLog,
+	})
+
+	require.NoError(t, job.Create(nil, nil)(ctx))
+	var manifest podManifest
+	require.NoError(t, json.Unmarshal([]byte(cluster.requests["POST /api/v1/namespaces/ci/pods"][0]), &manifest))
+	assert.Equal(t, "gitea-runner", manifest.Metadata.Labels["app.kubernetes.io/managed-by"])
+	assert.Equal(t, "runner-uuid", manifest.Metadata.Labels[runnerUUIDLabel])
+	assert.True(t, manifest.Spec.AutomountServiceAccountToken)
+	assert.False(t, manifest.Spec.EnableServiceLinks)
+	assert.Equal(t, []string{"my-db"}, manifest.Spec.HostAliases[0].Hostnames)
+	require.Len(t, manifest.Spec.Containers, 2)
+	assert.Equal(t, map[string]any{"limits": map[string]any{"cpu": "2", "memory": "1Gi"}}, manifest.Spec.Containers[0].Resources)
+	assert.Empty(t, manifest.Spec.Containers[0].ImagePullPolicy)
+	assert.Equal(t, "my-db", manifest.Spec.Containers[1].Name)
+	assert.Equal(t, "Always", manifest.Spec.Containers[1].ImagePullPolicy)
+	assert.Equal(t, map[string]any{"limits": map[string]any{"memory": "256Mi"}}, manifest.Spec.Containers[1].Resources)
+	assert.Equal(t, []map[string]any{
+		{"name": "workspace", "emptyDir": map[string]any{"sizeLimit": "1Gi"}},
+		{"name": "act", "emptyDir": map[string]any{}},
+	}, manifest.Spec.Volumes)
+	assert.Equal(t, struct{ PeriodSeconds, TimeoutSeconds, FailureThreshold int }{2, 30, 5}, *manifest.Spec.Containers[1].StartupProbe)
+	assert.NotContains(t, cluster.requests["POST /api/v1/namespaces/ci/pods"][0], "service-secret")
+	assert.Contains(t, cluster.requests["POST /api/v1/namespaces/ci/secrets"][0], "service-secret")
+	assert.Contains(t, cluster.requests["POST /api/v1/namespaces/ci/secrets"][0], `"com.gitea.runner.uuid":"runner-uuid"`)
+	assert.Contains(t, cluster.requests["POST /api/v1/namespaces/ci/pods"][0], `{"name":"POSTGRES_PASSWORD","valueFrom":{"secretKeyRef":{"key":"my-db.0","name":"`+pod.secretName+`"}}}`)
+	assert.Equal(t, []any{"new"}, mergeManifest([]any{"old"}, []any{"new"}, ""))
+	mount := func(path string) any { return map[string]any{"name": "config", "mountPath": path} }
+	assert.Equal(t, []any{mount("/a"), mount("/b")}, mergeManifest([]any{mount("/a")}, []any{mount("/b")}, "volumeMounts"))
+	tmpfs := map[string]any{"name": "workspace", "emptyDir": map[string]any{"medium": "Memory"}}
+	ephemeral := map[string]any{"name": "workspace", "ephemeral": map[string]any{}}
+	assert.Equal(t, []any{ephemeral}, mergeManifest([]any{tmpfs}, []any{ephemeral}, "volumes"))
+	assert.Contains(t, cluster.requests["POST /api/v1/namespaces/ci/pods"][0], `"args":["postgres","-D","$$(PGDATA)"]`)
+
+	require.NoError(t, os.WriteFile(filepath.Join(workdir, "env"), []byte("#!/bin/sh\necho \"$@\" > \"$0-args\"\nexec /usr/bin/env \"$@\"\n"), 0o755))
+	cluster.failExec(
+		execFailure(t, http.StatusInternalServerError, `{"message":"error dialing backend: remote error: tls: internal error"}`),
+		execFailure(t, 0, `{"status":"Failure","reason":"InternalError","message":"Internal error occurred: error sending request: remote error: tls: internal error"}`),
+	)
+	require.NoError(t, job.Start(false)(ctx))
+	assert.Len(t, cluster.requests["exec"], 3)
+	assert.True(t, pod.job.gzip)
+
+	stepEnv := map[string]string{"INPUT_WHO-TO-GREET": "it's\nme", "SECRET": "hunter2", "UID": "5"}
+	require.NoError(t, job.Exec([]string{"printenv", "SECRET"}, stepEnv, "", "")(ctx))
+	envArgs, err := os.ReadFile(filepath.Join(workdir, "env-args"))
+	require.NoError(t, err)
+	assert.NotContains(t, string(envArgs), "hunter2")
+	require.NoError(t, job.Exec([]string{"printenv", "INPUT_WHO-TO-GREET"}, stepEnv, "", "")(ctx))
+	require.NoError(t, job.Exec([]string{"printenv", "UID"}, stepEnv, "", "")(ctx))
+	require.NoError(t, job.Exec([]string{"pwd", "-P"}, nil, "", workdir)(ctx))
+	assert.Equal(t, "hunter2\nit's\nme\n5\n"+workdir+"\n", jobLog.String())
+	assert.Equal(t, ExitCodeError(3), job.Exec([]string{"sh", "-c", "echo failing >&2; exit 3"}, nil, "", "")(ctx))
+	assert.Contains(t, jobLog.String(), "failing\n")
+	for _, query := range cluster.requests["exec"] {
+		assert.NotContains(t, query, "hunter2")
+	}
+
+	lastExec := func() string { return cluster.requests["exec"][len(cluster.requests["exec"])-1] }
+	require.NoError(t, job.Copy(workdir+"/act/", &FileEntry{Name: "workflow/event.json", Mode: 0o644, Body: `{"ref":"main"}`})(ctx))
+	assert.NotContains(t, lastExec(), "gzip")
+	archive, err := job.GetContainerArchive(ctx, workdir+"/act/workflow/event.json")
+	require.NoError(t, err)
+	reader := tar.NewReader(archive)
+	header, err := reader.Next()
+	require.NoError(t, err)
+	content, err := io.ReadAll(reader)
+	require.NoError(t, err)
+	assert.Equal(t, "event.json", header.Name)
+	assert.JSONEq(t, `{"ref":"main"}`, string(content))
+	require.NoError(t, archive.Close())
+	_, err = job.GetContainerArchive(ctx, workdir+"/missing")
+	require.Error(t, err)
+	large := strings.Repeat("a", compressCopyMin)
+	require.NoError(t, job.Copy(workdir+"/act/", &FileEntry{Name: "workflow/large", Mode: 0o644, Body: large})(ctx))
+	assert.Contains(t, lastExec(), url.QueryEscape("gzip -dc |"))
+	content, err = os.ReadFile(workdir + "/act/workflow/large")
+	require.NoError(t, err)
+	assert.Equal(t, large, string(content))
+
+	actionDir := filepath.Join(t.TempDir(), "action")
+	require.NoError(t, os.MkdirAll(actionDir, 0o755))
+	require.NoError(t, os.WriteFile(filepath.Join(actionDir, "index.js"), []byte("main()"), 0o644))
+	require.NoError(t, job.CopyDir(workdir+"/act/actions/sha/", actionDir+"/", false, false)(ctx))
+	script, err := os.ReadFile(workdir + "/act/actions/sha/index.js")
+	require.NoError(t, err)
+	assert.Equal(t, "main()", string(script))
+	assert.Contains(t, lastExec(), "command="+url.QueryEscape(workdir+"/act/actions/sha/"))
+	assert.Contains(t, lastExec(), url.QueryEscape("gzip -dc |"))
+
+	pathEnv := map[string]string{}
+	require.NoError(t, job.UpdateFromImageEnv(&pathEnv)(ctx))
+	assert.Equal(t, path, pathEnv["PATH"])
+
+	info, err := service.Inspect(ctx)
+	require.NoError(t, err)
+	assert.Equal(t, HealthHealthy, info.Health)
+	require.NoError(t, service.DumpLogs(ctx))
+	assert.Equal(t, "log of my-db", serviceLog.String())
+
+	require.NoError(t, job.Remove()(ctx))
+	assert.Len(t, cluster.requests["DELETE /api/v1/namespaces/ci/pods/"+pod.name], 1)
+	assert.Len(t, cluster.requests["DELETE /api/v1/namespaces/ci/secrets/"+pod.secretName], 1)
+
+	require.NoError(t, RemoveOrphanKubernetesResources(ctx, options, time.Now()))
+	assert.Equal(t, []string{runnerUUIDLabel + "=runner-uuid"}, cluster.requests["list"])
+	assert.Len(t, cluster.requests["DELETE /api/v1/namespaces/ci/pods/old"], 1)
+	assert.Len(t, cluster.requests["DELETE /api/v1/namespaces/ci/secrets/old"], 1)
+	assert.Empty(t, cluster.requests["DELETE /api/v1/namespaces/ci/pods/new"])
+	assert.Empty(t, cluster.requests["DELETE /api/v1/namespaces/ci/secrets/new"])
+}
+
+func TestKubernetesCopiesUncompressedWithoutGzip(t *testing.T) {
+	t.Parallel()
+	if runtime.GOOS == "windows" {
+		t.Skip("uses POSIX shell")
+	}
+	ctx := t.Context()
+	workdir, bin := t.TempDir(), t.TempDir()
+	for _, tool := range []string{"uname", "tar", "mkdir"} { // all the job container needs but gzip, as on a minimal image
+		found, err := exec.LookPath(tool)
+		require.NoError(t, err)
+		require.NoError(t, os.Symlink(found, filepath.Join(bin, tool)))
+	}
+	kubeconfig, cluster := fakeKubernetes(t, `{"spec":{"containers":[{}]},"status":{"phase":"Running","containerStatuses":[
+		{"name":"job","ready":true,"state":{"running":{}}}]}}`, "PATH="+bin)
+	pod, err := NewKubernetesPod(KubernetesOptions{Kubeconfig: kubeconfig})
+	require.NoError(t, err)
+	job := pod.JobContainer(&NewContainerInput{Image: "node", WorkingDir: workdir})
+	require.NoError(t, job.Create(nil, nil)(ctx))
+	require.NoError(t, job.Start(false)(ctx))
+	assert.False(t, pod.job.gzip)
+	assert.Equal(t, bin, pod.path)
+
+	actionDir := filepath.Join(t.TempDir(), "action")
+	require.NoError(t, os.MkdirAll(actionDir, 0o755))
+	require.NoError(t, os.WriteFile(filepath.Join(actionDir, "index.js"), []byte("main()"), 0o644))
+	require.NoError(t, job.CopyDir(workdir+"/act/actions/sha/", actionDir+"/", false, false)(ctx))
+	script, err := os.ReadFile(workdir + "/act/actions/sha/index.js")
+	require.NoError(t, err)
+	assert.Equal(t, "main()", string(script))
+	assert.NotContains(t, cluster.requests["exec"][len(cluster.requests["exec"])-1], "gzip")
+}
+
+func TestKubernetesPodFailsBeforeSteps(t *testing.T) {
+	kubeconfig, _ := fakeKubernetes(t, `{"spec":{"containers":[{}]},"status":{"containerStatuses":[
+		{"name":"job","state":{"waiting":{"reason":"ErrImagePull","message":"no such image"}}}]}}`)
+	template := map[string]any{"spec": map[string]any{"containers": []any{map[string]any{"name": "sidecar"}}}}
+	for _, test := range []struct {
+		services     []string
+		options, err string
+	}{
+		{[]string{"db"}, "--hostname db", "only --health-* options are supported"},
+		{[]string{"sidecar"}, "", "named like another container"},
+		{[]string{"my_db", "My-DB"}, "", `service My-DB maps to container "my-db"`},
+	} {
+		pod, err := NewKubernetesPod(KubernetesOptions{Kubeconfig: kubeconfig, Namespace: "ci", PodTemplates: []map[string]any{template}})
+		require.NoError(t, err)
+		job := pod.JobContainer(&NewContainerInput{Image: "node"})
+		for _, service := range test.services {
+			pod.ServiceContainer(service, &NewContainerInput{Image: "postgres", WorkflowOptions: test.options})
+		}
+		require.ErrorContains(t, job.Create(nil, nil)(t.Context()), test.err)
+	}
+	running, cluster := fakeKubernetes(t, `{"spec":{"containers":[{}]},"status":{"containerStatuses":[{"name":"job","state":{"running":{}}}]}}`)
+	for _, test := range []struct {
+		failure http.HandlerFunc
+		err     string
+	}{
+		{execFailure(t, http.StatusForbidden, `{"message":"pods \"job\" is forbidden"}`), "is forbidden"},
+		{execFailure(t, 0, `{"status":"Failure","details":{"causes":[{"reason":"ExitCode","message":"126"}]}}`), ExitCodeError(126).Error()},
+	} {
+		cluster.failExec(test.failure)
+		pod, err := NewKubernetesPod(KubernetesOptions{Kubeconfig: running})
+		require.NoError(t, err)
+		job := pod.JobContainer(&NewContainerInput{Image: "node"})
+		require.NoError(t, job.Create(nil, nil)(t.Context()))
+		require.ErrorContains(t, job.Start(false)(t.Context()), test.err)
+	}
+	pod, err := NewKubernetesPod(KubernetesOptions{Kubeconfig: kubeconfig, Namespace: "ci"})
+	require.NoError(t, err)
+	job := pod.JobContainer(&NewContainerInput{Image: "missing"})
+	require.NoError(t, job.Create(nil, nil)(t.Context()))
+	require.ErrorContains(t, job.Start(false)(t.Context()), "ErrImagePull: no such image")
+	failed, _ := fakeKubernetes(t, `{"spec":{"containers":[{}]},"status":{"phase":"Failed","initContainerStatuses":[
+		{"name":"gitea-runner-transfer","state":{"terminated":{"exitCode":1,"message":"exec format error\n"}}}]}}`)
+	pod, err = NewKubernetesPod(KubernetesOptions{Kubeconfig: failed})
+	require.NoError(t, err)
+	job = pod.JobContainer(&NewContainerInput{Image: "node"})
+	require.NoError(t, job.Create(nil, nil)(t.Context()))
+	require.ErrorContains(t, job.Start(false)(t.Context()), "container gitea-runner-transfer exited with 1: exec format error")
+
+	plugin := filepath.Join(t.TempDir(), "kubeconfig")
+	require.NoError(t, os.WriteFile(plugin, []byte(`
+current-context: eks
+contexts: [{name: eks, context: {cluster: eks, user: eks}}]
+clusters: [{name: eks, cluster: {server: "https://eks.example"}}]
+users: [{name: eks, user: {exec: {command: aws}}}]
+`), 0o600))
+	_, err = NewKubernetesPod(KubernetesOptions{Kubeconfig: plugin})
+	require.ErrorContains(t, err, "credential plugin")
+}

act/container/kubernetes_transfer.go

@@ -0,0 +1,248 @@
+// Copyright 2026 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package container
+
+import (
+	"cmp"
+	"context"
+	"crypto/ecdsa"
+	"crypto/elliptic"
+	"crypto/rand"
+	"crypto/sha256"
+	"crypto/tls"
+	"crypto/x509"
+	"encoding/hex"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"math/big"
+	"net"
+	"net/http"
+	"os"
+	"os/exec"
+	"path"
+	"path/filepath"
+	"slices"
+	"strconv"
+	"strings"
+	"sync"
+	"time"
+
+	"gitea.com/gitea/runner/act/common"
+	"gitea.com/gitea/runner/act/common/logging"
+)
+
+// KubernetesTransfer has job pods fetch large copies from the runner over the pod network instead of through the API server.
+type KubernetesTransfer struct {
+	Host     string // empty uses the outbound IP
+	Port     uint16 // 0 picks a free port
+	Image    string // has gitea-runner on its PATH, for an init container to copy into each job pod
+	Fallback bool   // copy through the API server when a job pod cannot reach the runner, else fail
+}
+
+// KubernetesTransferCommand is the hidden runner subcommand job pods run the transfer helper with.
+const KubernetesTransferCommand = "kubernetes-transfer"
+
+// transferRequest goes to the helper on the exec stream's stdin, keeping the token out of the command line and the audit log.
+type transferRequest struct {
+	URL string `json:"url"`
+	Pin string `json:"pin"` // hex SHA-256 of the runner's certificate
+}
+
+type transferServer struct {
+	base    string
+	pin     string
+	mu      sync.Mutex
+	pending map[string]transferOffer
+}
+
+type transferOffer struct {
+	clients []net.IP
+	write   func(io.Writer) error
+	result  chan error
+}
+
+var (
+	transferServersMu sync.Mutex
+	transferServers   = map[string]*transferServer{}
+)
+
+// startTransferServer returns the runner's server for these settings, started on first use.
+func startTransferServer(host string, port uint16) (*transferServer, error) {
+	transferServersMu.Lock()
+	defer transferServersMu.Unlock()
+	configured := net.JoinHostPort(host, strconv.Itoa(int(port)))
+	if server, ok := transferServers[configured]; ok {
+		return server, nil
+	}
+	if host == "" {
+		ip := common.GetOutboundIP()
+		if ip == nil {
+			return nil, errors.New("no outbound IP for job pods to reach the runner at, set kubernetes.transfer.host")
+		}
+		host = ip.String()
+	}
+	privateKey, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
+	if err != nil {
+		return nil, err
+	}
+	template := &x509.Certificate{SerialNumber: big.NewInt(1)} // trusted by its pin alone, so no CA, names or validity
+	certificate, err := x509.CreateCertificate(rand.Reader, template, template, &privateKey.PublicKey, privateKey)
+	if err != nil {
+		return nil, err
+	}
+	listener, err := net.Listen("tcp", net.JoinHostPort(host, strconv.Itoa(int(port))))
+	if err != nil {
+		return nil, fmt.Errorf("listen for job pod transfers: %w", err)
+	}
+	pin := sha256.Sum256(certificate)
+	server := &transferServer{base: "https://" + listener.Addr().String() + "/", pin: hex.EncodeToString(pin[:]), pending: map[string]transferOffer{}}
+	httpServer := &http.Server{
+		Handler:           server,
+		TLSConfig:         &tls.Config{Certificates: []tls.Certificate{{Certificate: [][]byte{certificate}, PrivateKey: privateKey}}, MinVersion: tls.VersionTLS13},
+		ReadHeaderTimeout: 10 * time.Second,
+		IdleTimeout:       30 * time.Second,
+	}
+	go func() { _ = httpServer.ServeTLS(listener, "", "") }()
+	transferServers[configured] = server
+	return server, nil
+}
+
+// offer serves write once to one of clients until done, which reports whether a client took it and what write failed with.
+func (s *transferServer) offer(clients []net.IP, write func(io.Writer) error) (request transferRequest, done func() (taken bool, err error)) {
+	token := rand.Text()
+	result := make(chan error, 1)
+	s.mu.Lock()
+	s.pending[token] = transferOffer{clients: clients, write: write, result: result}
+	s.mu.Unlock()
+	return transferRequest{URL: s.base + token, Pin: s.pin}, func() (bool, error) {
+		s.mu.Lock()
+		_, pending := s.pending[token]
+		delete(s.pending, token)
+		s.mu.Unlock()
+		select {
+		case err := <-result:
+			return true, err
+		default:
+			return !pending, nil
+		}
+	}
+}
+
+func (s *transferServer) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	host, _, _ := net.SplitHostPort(r.RemoteAddr)
+	token := strings.TrimPrefix(r.URL.Path, "/")
+	s.mu.Lock()
+	offer, ok := s.pending[token]
+	ok = ok && r.Method == http.MethodGet && slices.ContainsFunc(offer.clients, net.ParseIP(host).Equal)
+	if ok {
+		delete(s.pending, token)
+	}
+	s.mu.Unlock()
+	if !ok {
+		http.NotFound(w, r)
+		return
+	}
+	w.Header().Set("Content-Encoding", "gzip")
+	err := writeGzip(w, offer.write)
+	offer.result <- err
+	if err != nil {
+		panic(http.ErrAbortHandler) // a cut-off body fails the fetch, a short tar might not
+	}
+}
+
+// FetchKubernetesTransfer reads a transferRequest from request and extracts the tar it points to into dest.
+func FetchKubernetesTransfer(ctx context.Context, request io.Reader, dest string) error {
+	var transfer transferRequest
+	if err := json.NewDecoder(request).Decode(&transfer); err != nil {
+		return fmt.Errorf("read transfer request: %w", err)
+	}
+	client := &http.Client{Transport: &http.Transport{
+		DialContext:           (&net.Dialer{Timeout: 10 * time.Second}).DialContext,
+		TLSHandshakeTimeout:   10 * time.Second,
+		ResponseHeaderTimeout: time.Minute,
+		TLSClientConfig: &tls.Config{
+			MinVersion:         tls.VersionTLS13,
+			InsecureSkipVerify: true, // VerifyConnection checks the pin instead
+			VerifyConnection: func(state tls.ConnectionState) error {
+				if sum := sha256.Sum256(state.PeerCertificates[0].Raw); hex.EncodeToString(sum[:]) != transfer.Pin {
+					return errors.New("runner certificate does not match the pin")
+				}
+				return nil
+			},
+		},
+	}}
+	httpRequest, err := http.NewRequestWithContext(ctx, http.MethodGet, transfer.URL, nil)
+	if err != nil {
+		return err
+	}
+	response, err := client.Do(httpRequest)
+	if err != nil {
+		return err
+	}
+	defer response.Body.Close()
+	if response.StatusCode != http.StatusOK {
+		return fmt.Errorf("fetch: %s", response.Status)
+	}
+	if err := os.MkdirAll(dest, 0o777); err != nil {
+		return err
+	}
+	cmd := exec.CommandContext(ctx, "tar", "-xf", "-", "-C", dest)
+	cmd.Stdin, cmd.Stdout, cmd.Stderr = response.Body, os.Stderr, os.Stderr
+	if err := cmd.Run(); err != nil {
+		return err
+	}
+	_, err = io.Copy(io.Discard, response.Body) // tar stops at the first zero blocks, a cut-off body after them still fails
+	return err
+}
+
+// InstallKubernetesTransferHelper copies the running binary to target.
+func InstallKubernetesTransferHelper(target string) error {
+	executable, err := os.Executable()
+	if err != nil {
+		return err
+	}
+	source, err := os.Open(executable)
+	if err != nil {
+		return err
+	}
+	defer source.Close()
+	if err := os.MkdirAll(filepath.Dir(target), 0o755); err != nil {
+		return err
+	}
+	_ = os.Remove(target) // a file left in a reused act volume would keep its mode
+	file, err := os.OpenFile(target, os.O_CREATE|os.O_EXCL|os.O_WRONLY, 0o755)
+	if err != nil {
+		return err
+	}
+	_, err = io.Copy(file, source)
+	return errors.Join(err, file.Close())
+}
+
+// setupTransfer turns on transfers for the pod, with the runner pod's image unless one is set.
+func (p *KubernetesPod) setupTransfer(runnerImage string) error {
+	settings := p.options.Transfer
+	if settings == nil {
+		return nil
+	}
+	image := cmp.Or(settings.Image, runnerImage)
+	var err error
+	var server *transferServer
+	if image == "" {
+		err = errors.New("set kubernetes.transfer.image, the runner is no single-container pod in kubernetes.namespace to take it from")
+	} else {
+		server, err = startTransferServer(settings.Host, settings.Port)
+	}
+	if err != nil {
+		if !settings.Fallback {
+			return fmt.Errorf("kubernetes.transfer: %w", err)
+		}
+		logging.Warnf("Job pod copies go through the API server: %v", err)
+		return nil
+	}
+	p.transfer, p.transferImage = server, image
+	p.transferHelper = path.Join(p.job.GetActPath(), "bin", "gitea-runner")
+	return nil
+}

act/container/kubernetes_transfer_test.go

@@ -0,0 +1,185 @@
+// Copyright 2026 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package container
+
+import (
+	"bytes"
+	"context"
+	"crypto/rand"
+	"crypto/tls"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"net"
+	"net/http"
+	"os"
+	"path/filepath"
+	"runtime"
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+const transferHelperEnv = "GITEA_RUNNER_TEST_TRANSFER_HELPER"
+
+func TestMain(m *testing.M) {
+	if os.Getenv(transferHelperEnv) == "1" && len(os.Args) == 4 && os.Args[1] == KubernetesTransferCommand && os.Args[2] == "fetch" {
+		if err := FetchKubernetesTransfer(context.Background(), os.Stdin, os.Args[3]); err != nil {
+			fmt.Fprintln(os.Stderr, err)
+			os.Exit(1)
+		}
+		os.Exit(0)
+	}
+	os.Exit(m.Run())
+}
+
+func fetch(t *testing.T, request transferRequest) error {
+	t.Helper()
+	body, err := json.Marshal(request)
+	require.NoError(t, err)
+	return FetchKubernetesTransfer(t.Context(), bytes.NewReader(body), t.TempDir())
+}
+
+func TestTransferServer(t *testing.T) {
+	if runtime.GOOS == "windows" {
+		t.Skip("extracts with tar")
+	}
+	server, err := startTransferServer("127.0.0.1", 0)
+	require.NoError(t, err)
+	again, err := startTransferServer("127.0.0.1", 0)
+	require.NoError(t, err)
+	assert.Same(t, server, again)
+	loopback := []net.IP{net.ParseIP("127.0.0.1")}
+	nothing := func(io.Writer) error { return nil }
+
+	t.Run("serves an offer gzipped once to an IP of its job pod", func(t *testing.T) {
+		request, done := server.offer([]net.IP{net.ParseIP("fd00::1"), loopback[0]}, nothing)
+		client := &http.Client{Transport: &http.Transport{TLSClientConfig: &tls.Config{InsecureSkipVerify: true}, DisableCompression: true}}
+		response, err := client.Get(request.URL)
+		require.NoError(t, err)
+		require.NoError(t, response.Body.Close())
+		assert.Equal(t, "gzip", response.Header.Get("Content-Encoding"))
+		require.ErrorContains(t, fetch(t, request), "404")
+		taken, _ := done()
+		assert.True(t, taken)
+	})
+
+	t.Run("another pod can neither take nor block an offer", func(t *testing.T) {
+		request, done := server.offer([]net.IP{net.ParseIP("10.1.2.3")}, nothing)
+		require.ErrorContains(t, fetch(t, request), "404")
+		taken, _ := done()
+		assert.False(t, taken)
+	})
+
+	t.Run("a failed write fails the fetch even past the end blocks tar stops at, and done reports it", func(t *testing.T) {
+		request, done := server.offer(loopback, func(w io.Writer) error {
+			_, _ = w.Write(make([]byte, 1024))
+			_, _ = io.CopyN(w, rand.Reader, 1<<20)
+			return errors.New("source gone")
+		})
+		require.Error(t, fetch(t, request))
+		taken, err := done()
+		assert.True(t, taken)
+		require.EqualError(t, err, "source gone")
+	})
+
+	t.Run("the helper refuses a runner whose certificate does not match its pin", func(t *testing.T) {
+		request, done := server.offer(loopback, nothing)
+		request.Pin = strings.Repeat("0", 64)
+		require.ErrorContains(t, fetch(t, request), "does not match the pin")
+		taken, _ := done()
+		assert.False(t, taken)
+	})
+}
+
+func TestKubernetesPodTransferImage(t *testing.T) {
+	newPod := func(image string, fallback bool) *KubernetesPod {
+		pod := &KubernetesPod{options: KubernetesOptions{Transfer: &KubernetesTransfer{Host: "127.0.0.1", Image: image, Fallback: fallback}}}
+		pod.JobContainer(&NewContainerInput{})
+		return pod
+	}
+
+	pod := newPod("", false)
+	require.NoError(t, pod.setupTransfer("gitea/runner:latest"))
+	assert.Equal(t, "gitea/runner:latest", pod.transferImage)
+
+	pod = newPod("registry.example/runner:1", false)
+	require.NoError(t, pod.setupTransfer("gitea/runner:latest"))
+	assert.Equal(t, "registry.example/runner:1", pod.transferImage)
+
+	pod = newPod("", true)
+	require.NoError(t, pod.setupTransfer(""))
+	assert.Empty(t, pod.transferHelper)
+
+	pod = newPod("", false)
+	require.ErrorContains(t, pod.setupTransfer(""), "kubernetes.transfer.image")
+}
+
+func TestKubernetesPodCopiesLargeFilesOverPodNetwork(t *testing.T) {
+	if runtime.GOOS == "windows" {
+		t.Skip("uses POSIX shell")
+	}
+	ctx := t.Context()
+	workdir, err := filepath.EvalSymlinks(t.TempDir())
+	require.NoError(t, err)
+	kubeconfig, cluster := fakeKubernetes(t, `{"spec":{"containers":[{}]},"status":{"phase":"Running","podIPs":[{"ip":"127.0.0.1"}],"containerStatuses":[
+		{"name":"job","ready":true,"state":{"running":{}}}]}}`, transferHelperEnv+"=1")
+	pod, err := NewKubernetesPod(KubernetesOptions{Kubeconfig: kubeconfig, ForcePull: true, Transfer: &KubernetesTransfer{Host: "127.0.0.1", Image: "gitea/runner:latest", Fallback: true}})
+	require.NoError(t, err)
+	job := pod.JobContainer(&NewContainerInput{Name: "job", Image: "node", WorkingDir: workdir, Stdout: io.Discard, Stderr: io.Discard})
+	require.NoError(t, job.Create(nil, nil)(ctx))
+
+	var manifest struct {
+		Spec struct {
+			InitContainers []struct {
+				Image, ImagePullPolicy string
+				Command                []string
+				VolumeMounts           []struct{ Name, MountPath string }
+			}
+		}
+	}
+	require.NoError(t, json.Unmarshal([]byte(cluster.requests["POST /api/v1/namespaces/ci/pods"][0]), &manifest))
+	require.Len(t, manifest.Spec.InitContainers, 1)
+	initContainer := manifest.Spec.InitContainers[0]
+	assert.Equal(t, "gitea/runner:latest", initContainer.Image)
+	assert.Equal(t, "Always", initContainer.ImagePullPolicy)
+	assert.Equal(t, []string{"gitea-runner", KubernetesTransferCommand, "install", "/var/run/act/bin/gitea-runner"}, initContainer.Command)
+	assert.Equal(t, []struct{ Name, MountPath string }{{"act", "/var/run/act"}}, initContainer.VolumeMounts)
+	require.NoError(t, job.Start(false)(ctx))
+
+	helper := filepath.Join(t.TempDir(), "bin", "gitea-runner")
+	require.NoError(t, InstallKubernetesTransferHelper(helper))
+	pod.transferHelper = helper
+	lastExec := func() string { return cluster.requests["exec"][len(cluster.requests["exec"])-1] }
+	large := &FileEntry{Name: "large", Mode: 0o644, Body: strings.Repeat("a", compressCopyMin)}
+	copyLarge := func(dir string) error { return job.Copy(filepath.Join(workdir, dir)+"/", large)(ctx) }
+	require.NoError(t, copyLarge("transferred"))
+	content, err := os.ReadFile(filepath.Join(workdir, "transferred", "large"))
+	require.NoError(t, err)
+	assert.Equal(t, large.Body, string(content))
+	assert.Contains(t, lastExec(), "command="+KubernetesTransferCommand)
+	assert.NotContains(t, lastExec(), "127.0.0.1")
+
+	require.NoError(t, job.Copy(workdir+"/act/", &FileEntry{Name: "event.json", Mode: 0o644, Body: `{}`})(ctx))
+	assert.NotContains(t, lastExec(), "command="+KubernetesTransferCommand)
+
+	require.NoError(t, os.WriteFile(filepath.Join(workdir, "file"), nil, 0o644))
+	require.ErrorContains(t, copyLarge("file"), "over the pod network")
+	assert.Equal(t, helper, pod.transferHelper)
+
+	unreachable := filepath.Join(workdir, "unreachable")
+	require.NoError(t, os.WriteFile(unreachable, []byte("#!/bin/sh\necho 'connection refused' >&2\nexit 1\n"), 0o755))
+	pod.transferHelper = unreachable
+	pod.options.Transfer.Fallback = false
+	require.ErrorContains(t, copyLarge("direct"), "connection refused")
+	assert.NoFileExists(t, filepath.Join(workdir, "direct", "large"))
+
+	pod.options.Transfer.Fallback = true
+	require.NoError(t, copyLarge("auto"))
+	assert.FileExists(t, filepath.Join(workdir, "auto", "large"))
+	assert.Empty(t, pod.transferHelper)
+}