copr-hypervisor: don't operate with main.ini

The commit a12c6d9396 wasn't enough, there
are other undefined variables.

inventory/group_vars/copr_hypervisor

@@ -1,6 +1 @@
 ---
-# Because we prepare golden images for copr builders on Copr vmhosts, we need to
-# have "provision configuration" done there, too (otherwise typically needed on
-# backend, where we start and provision the builders).  The frontend_base_url is
-# by accident needed to properly instantiate the provision templates.
-frontend_base_url: "https://copr.fedorainfracloud.org"

roles/copr/backend/files/provision/provision_builder_tasks.yml

@@ -162,6 +162,9 @@
 
 - name: put copr-rpmbuild configuration file in the right place
   copy: src=files/main.ini dest=/etc/copr-rpmbuild/main.ini
+  when:
+    # TODO: use the default main.ini provided by copr-rpmbuild
+    - prepare_base_image is not defined
 
 - name: mockbuilder user
   user: name=mockbuilder groups=mock

roles/copr/backend/tasks/setup_provisioning_environment.yml

@@ -74,6 +74,8 @@
   tags:
   - provision_config
   - copr_rpmbuild_main_ini
+  when:
+    when: "'copr_hypervisor' not in group_names"
 
 - name: put rpkg configuration file into the provision subdir
   template: src="{{ roles_path }}/copr/backend/templates/provision/rpkg.conf.j2"