gitlab: add special rule for the hexagon container

The hexagon container is always manually built but of course not
everyone will be building it themselves and pushing to their
registries. We still need to create a "local" registry copy for the
actual gitlab tests to run. We don't build it in this case, just pull
it across from the upstream registry. We disable this rule from
running on the qemu-project itself so it doesn't accidentally wipe out
our master copy.

Fixes: 910c40ee94 ("gitlab: add build-user-hexagon test")
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Tested-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Willian Rampazzo <willianr@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Cc: Cornelia Huck <cohuck@redhat.com>
Message-Id: <20210520174303.12310-4-alex.bennee@linaro.org>

.gitlab-ci.d/containers.yml

@@ -101,6 +101,34 @@ armhf-debian-cross-container:
   variables:
     NAME: debian-armhf-cross
 
+# We never want to build hexagon in the CI system and by default we
+# always want to refer to the master registry where it lives.
+hexagon-cross-container:
+  image: docker:stable
+  stage: containers
+  rules:
+    - if: '$CI_PROJECT_NAMESPACE == "qemu-project"'
+      when: never
+    - when: always
+  variables:
+    NAME: debian-hexagon-cross
+    GIT_DEPTH: 1
+  services:
+    - docker:dind
+  before_script:
+    - export TAG="$CI_REGISTRY_IMAGE/qemu/$NAME:latest"
+    - export COMMON_TAG="$CI_REGISTRY/qemu-project/qemu/qemu/$NAME:latest"
+    - docker info
+    - docker login $CI_REGISTRY -u "$CI_REGISTRY_USER" -p "$CI_REGISTRY_PASSWORD"
+  script:
+    - echo "TAG:$TAG"
+    - echo "COMMON_TAG:$COMMON_TAG"
+    - docker pull $COMMON_TAG
+    - docker tag $COMMON_TAG $TAG
+    - docker push "$TAG"
+  after_script:
+    - docker logout
+
 hppa-debian-cross-container:
   extends: .container_job_template
   stage: containers-layer2

.gitlab-ci.yml

@@ -417,10 +417,13 @@ build-user-static:
     MAKE_CHECK_ARGS: check-tcg
 
 # Because the hexagon cross-compiler takes so long to build we don't rely
-# on the CI system to build it and hence this job has no dependency
+# on the CI system to build it and hence this job has an optional dependency
 # declared. The image is manually uploaded.
 build-user-hexagon:
   extends: .native_build_job_template
+  needs:
+    job: hexagon-cross-container
+    optional: true
   variables:
     IMAGE: debian-hexagon-cross
     TARGETS: hexagon-linux-user