[PATCH v3 3/5] automation: allow selecting individual jobs via CI variables

[Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>]

Debugging sometimes involves running specific jobs on different
versions. It's useful to easily avoid running all of the not interesting
ones (for given case) to save both time and CI resources. Doing so used
to require changing the yaml files, usually in several places.
Ease this step by adding SELECTED_JOBS_ONLY variable that takes a regex.
Note that one needs to satisfy job dependencies on their own (for
example if a test job needs a build job, that specific build job
needs to be included too).

The variable can be specified via Gitlab web UI when scheduling a
pipeline, but it can be also set when doing git push directly:

    git push -o ci.variable=SELECTED_JOBS_ONLY="/job1|job2/"

More details at https://docs.gitlab.co.jp/ee/user/project/push_options.html

The variable needs to include regex for selecting jobs, including
enclosing slashes.
A coma/space separated list of jobs to select would be friendlier UX,
but unfortunately that is not supported:
https://gitlab.com/gitlab-org/gitlab/-/issues/209904 (note the proposed
workaround doesn't work for job-level CI_JOB_NAME).
On the other hand, the regex is more flexible (one can select for
example all arm32 jobs).

Signed-off-by: Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>
---
Changes in v3:
- include variable in Web UI for starting pipeline
---
 .gitlab-ci.yml                  |  2 ++
 automation/gitlab-ci/build.yaml |  6 ++++++
 automation/gitlab-ci/test.yaml  | 14 ++++++++++++++
 3 files changed, 22 insertions(+)

diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 5a9b8b722838..b3beb2ff9ddf 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,5 +1,7 @@
 variables:
   XEN_REGISTRY: registry.gitlab.com/xen-project/xen
+  SELECTED_JOBS_ONLY:
+    description: "Regex to select only some jobs, must be enclosed with /. For 
example /job1|job2/"
 
 workflow:
   rules:
diff --git a/automation/gitlab-ci/build.yaml b/automation/gitlab-ci/build.yaml
index 35e224366f62..f12de00a164a 100644
--- a/automation/gitlab-ci/build.yaml
+++ b/automation/gitlab-ci/build.yaml
@@ -12,6 +12,12 @@
       - '*/*.log'
     when: always
   needs: []
+  rules:
+  - if: $SELECTED_JOBS_ONLY && $CI_JOB_NAME =~ $SELECTED_JOBS_ONLY
+    when: always
+  - if: $SELECTED_JOBS_ONLY
+    when: never
+  - when: on_success
 
 .gcc-tmpl:
   variables: &gcc
diff --git a/automation/gitlab-ci/test.yaml b/automation/gitlab-ci/test.yaml
index c21a37933881..93632f1f9204 100644
--- a/automation/gitlab-ci/test.yaml
+++ b/automation/gitlab-ci/test.yaml
@@ -1,6 +1,11 @@
 .test-jobs-common:
   stage: test
   image: ${XEN_REGISTRY}/${CONTAINER}
+  rules:
+  - if: $SELECTED_JOBS_ONLY && $CI_JOB_NAME =~ $SELECTED_JOBS_ONLY
+  - if: $SELECTED_JOBS_ONLY
+    when: never
+  - when: on_success
 
 .arm64-test-needs: &arm64-test-needs
   - alpine-3.18-arm64-rootfs-export
@@ -99,6 +104,9 @@
       - '*.dtb'
     when: always
   rules:
+    - if: $SELECTED_JOBS_ONLY && $CI_JOB_NAME =~ $SELECTED_JOBS_ONLY
+    - if: $SELECTED_JOBS_ONLY
+      when: never
     - if: $XILINX_JOBS == "true" && $CI_COMMIT_REF_PROTECTED == "true"
   tags:
     - xilinx
@@ -117,6 +125,9 @@
       - '*.log'
     when: always
   rules:
+    - if: $SELECTED_JOBS_ONLY && $CI_JOB_NAME =~ $SELECTED_JOBS_ONLY
+    - if: $SELECTED_JOBS_ONLY
+      when: never
     - if: $XILINX_JOBS == "true" && $CI_COMMIT_REF_PROTECTED == "true"
   tags:
     - xilinx
@@ -137,6 +148,9 @@
       - '*.log'
     when: always
   rules:
+    - if: $SELECTED_JOBS_ONLY && $CI_JOB_NAME =~ $SELECTED_JOBS_ONLY
+    - if: $SELECTED_JOBS_ONLY
+      when: never
     - if: $QUBES_JOBS == "true" && $CI_COMMIT_REF_PROTECTED == "true"
   tags:
     - qubes-hw2
-- 
git-series 0.9.1