ci: Add some additional commit formatting rules

For ci-fairy check-commits to pick it up. These are mostly cosmetic:
- Require that the commit subject has a prefix
- Prevent commits from having links to the merge request itself
  (should be already there via merge commits)
- Ensure commit subjects are properly capitalized
- Avoid code filenames in commit subject

We could add some further things in the future, like enforcing a
set of prefixes to use in commit log subjects.

1 files changed, 13 insertions, 0 deletions

diff --git a/.gitlab-ci/commit-rules.yml b/.gitlab-ci/commit-rules.yml
new file mode 100644
index 000000000..fbd78a35d
--- /dev/null
+++ b/.gitlab-ci/commit-rules.yml
@@ -0,0 +1,13 @@
+patterns:
+  require:
+    - regex: '^[^:]+: +[^ ]'
+      message: "Commit message subject must have a prefix. E.g. 'tests: '"
+  deny:
+    - regex: '^$CI_MERGE_REQUEST_PROJECT_URL/(-/)?merge_requests/$CI_MERGE_REQUEST_IID$'
+      message: "Commit message must not contain a link to its own merge request"
+    - regex: '^[^:]+: [a-z]'
+      message: "Commit message subject should be properly Capitalized. E.g.  'cli: Fix help subcommand'"
+      where: subject
+    - regex: '^\S*\.[ch]:'
+      message: Commit message subject prefix should not include .c, .h, etc.
+      where: subject