test pull requests under Python 3 as well

docker/Dockerfile-tests

@@ -44,7 +44,7 @@ RUN yum -y install \
     rpm-build \
     && yum clean all
 # We currently require a newer versions of these Python packages for the tests
-RUN pip install --upgrade flask-sqlalchemy pytest flake8 tox
+RUN pip install --upgrade flask-sqlalchemy pytest flake8 tox pip
 VOLUME /src
 WORKDIR /src
 CMD ["bash", "docker/test.sh"]

docker/Dockerfile-tests-py3

@@ -0,0 +1,38 @@
+FROM fedora:29
+
+WORKDIR /build
+RUN dnf -y install \
+    --nogpgcheck \
+    --setopt=deltarpm=0 \
+    --setopt=install_weak_deps=false \
+    --setopt=tsflags=nodocs \
+    git-core \
+    createrepo_c \
+    python3-fedmsg \
+    python3-kobo-rpmlib \
+    python3-rpm \
+    libmodulemd \
+    python3-gobject \
+    python3-dogpile-cache \
+    python3-flask \
+    python3-flask-migrate \
+    python3-flask-sqlalchemy \
+    python3-koji \
+    python3-ldap3 \
+    python3-munch \
+    python3-pip \
+    python3-requests \
+    python3-six \
+    python3-solv \
+    python3-sqlalchemy \
+    python3-pungi \
+    # Test-only dependencies
+    python3-pytest \
+    python3-flake8 \
+    python3-mock \
+    python3-tox \
+    rpm-build \
+    && dnf clean all
+VOLUME /src
+WORKDIR /src
+CMD ["bash", "docker/test-py3.sh"]

docker/test-py3.sh

@@ -0,0 +1,34 @@
+#!/bin/bash
+
+# Remove requirements not necessary for Python 3.7.
+# Also, prevent koji from being re-installed from PyPi.
+cp requirements.txt requirements.txt.orig.py3
+sed -i \
+    -e '/enum34/d' \
+    -e '/funcsigs/d' \
+    -e '/futures/d' \
+    -e '/koji/d' \
+    requirements.txt
+
+# Run everything with Python 3
+cp tox.ini tox.ini.orig.py3
+sed -i \
+    -e 's/py.test/py.test-3/g' \
+    -e '/basepython/d' \
+    tox.ini
+
+# Delete any leftover compiled Python files
+for dir in module_build_service tests; do
+    find ${dir} -type f \( -name '*.pyc' -or -name '*.pyc' \) -exec rm -f {} \;
+done
+
+# Since tox seems to ignore `usedevelop` when we have `sitepackages` on, we have to run it manually
+python3 setup.py develop --no-deps
+/usr/bin/tox -e flake8,py3
+rv=$?
+
+# After running tox, we can revert back to the original files
+rm -f requirements.txt tox.ini
+mv requirements.txt.orig.py3 requirements.txt
+mv tox.ini.orig.py3 tox.ini
+exit $rv

docker/test.sh

@@ -8,6 +8,9 @@ sed -i '/koji/d' requirements.txt
 for dir in module_build_service tests; do
     find ${dir} -type f \( -name '*.pyc' -or -name '*.pyc' \) -exec rm -f {} \;
 done
+# The python-virtualenv package bundles a very old version of pip,
+# which is incompatible with modern virtualenv.
+rm -f /usr/lib/python2.7/site-packages/virtualenv_support/pip-9*
 # Since tox seems to ignore `usedevelop` when we have `sitepackages` on, we have to run it manually
 python setup.py develop --no-deps
 /usr/bin/tox -e flake8,py27