gitlab-ci: add manual job to run Coverity

Add a job that can be run, either manually or on a schedule, to upload
a build to Coverity Scan.  The job uses the run-coverity-scan script
in multiple phases of check, download tools and upload, in order to
avoid both wasting time (skip everything if you are above the upload
quota) and avoid filling the log with the progress of downloading
the tools.

The job is intended to run on a scheduled pipeline run, and scheduled
runs will not get any other job.  It requires two variables to be in
GitLab CI, COVERITY_TOKEN and COVERITY_EMAIL.  Those are already set up
in qemu-project's configuration as protected and masked variables.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

.gitlab-ci.d/base.yml

@@ -41,6 +41,10 @@ variables:
     - if: '$CI_PROJECT_NAMESPACE == $QEMU_CI_UPSTREAM && $CI_COMMIT_TAG'
       when: never
 
+    # Scheduled runs on mainline don't get pipelines except for the special Coverity job
+    - if: '$CI_PROJECT_NAMESPACE == $QEMU_CI_UPSTREAM && $CI_PIPELINE_SOURCE == "schedule"'
+      when: never
+
     # Cirrus jobs can't run unless the creds / target repo are set
     - if: '$QEMU_JOB_CIRRUS && ($CIRRUS_GITHUB_REPO == null || $CIRRUS_API_TOKEN == null)'
       when: never

.gitlab-ci.d/buildtest.yml

@@ -729,3 +729,40 @@ pages:
       - public
   variables:
     QEMU_JOB_PUBLISH: 1
+
+coverity:
+  image: $CI_REGISTRY_IMAGE/qemu/fedora:$QEMU_CI_CONTAINER_TAG
+  stage: build
+  allow_failure: true
+  timeout: 3h
+  needs:
+    - job: amd64-fedora-container
+      optional: true
+  before_script:
+    - dnf install -y curl wget
+  script:
+    # would be nice to cancel the job if over quota (https://gitlab.com/gitlab-org/gitlab/-/issues/256089)
+    # for example:
+    #   curl --request POST --header "PRIVATE-TOKEN: $CI_JOB_TOKEN" "${CI_SERVER_URL}/api/v4/projects/${CI_PROJECT_ID}/jobs/${CI_JOB_ID}/cancel
+    - 'scripts/coverity-scan/run-coverity-scan --check-upload-only || { exitcode=$?; if test $exitcode = 1; then
+        exit 0;
+      else
+        exit $exitcode;
+      fi; };
+      scripts/coverity-scan/run-coverity-scan --update-tools-only > update-tools.log 2>&1 || { cat update-tools.log; exit 1; };
+      scripts/coverity-scan/run-coverity-scan --no-update-tools'
+  rules:
+    - if: '$COVERITY_TOKEN == null'
+      when: never
+    - if: '$COVERITY_EMAIL == null'
+      when: never
+    # Never included on upstream pipelines, except for schedules
+    - if: '$CI_PROJECT_NAMESPACE == $QEMU_CI_UPSTREAM && $CI_PIPELINE_SOURCE == "schedule"'
+      when: on_success
+    - if: '$CI_PROJECT_NAMESPACE == $QEMU_CI_UPSTREAM'
+      when: never
+    # Forks don't get any pipeline unless QEMU_CI=1 or QEMU_CI=2 is set
+    - if: '$QEMU_CI != "1" && $QEMU_CI != "2"'
+      when: never
+    # Always manual on forks even if $QEMU_CI == "2"
+    - when: manual

.gitlab-ci.d/opensbi.yml

@@ -24,6 +24,10 @@
     - if: '$QEMU_CI == "1" && $CI_PROJECT_NAMESPACE != "qemu-project" && $CI_COMMIT_MESSAGE =~ /opensbi/i'
       when: manual
 
+    # Scheduled runs on mainline don't get pipelines except for the special Coverity job
+    - if: '$CI_PROJECT_NAMESPACE == $QEMU_CI_UPSTREAM && $CI_PIPELINE_SOURCE == "schedule"'
+      when: never
+
     # Run if any files affecting the build output are touched
     - changes:
         - .gitlab-ci.d/opensbi.yml