ci: Replace custom commit-log script with ci-fairy

ci-fairy now supports checking commit messages for required/disallowed
patterns. Use that to replace our custom commit-log script.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1649>

3 files changed, 27 insertions, 124 deletions

diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index e35362717..224d407cb 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,6 +1,6 @@
 include:
-  - remote: 'https://gitlab.freedesktop.org/freedesktop/ci-templates/-/raw/8445ff7af2a68795afb98f486251f2ef8f90621c/templates/fedora.yml'
-  - remote: "https://gitlab.freedesktop.org/freedesktop/ci-templates/-/raw/8445ff7af2a68795afb98f486251f2ef8f90621c/templates/ci-fairy.yml"
+  - remote: 'https://gitlab.freedesktop.org/freedesktop/ci-templates/-/raw/18194044f0f984c8815bc9a1a146582f6bf15d41/templates/fedora.yml'
+  - remote: "https://gitlab.freedesktop.org/freedesktop/ci-templates/-/raw/6f86b8bcb0cd5168c32779c4fea9a893c4a0c046/templates/ci-fairy.yml"
 
 stages:
  - review
@@ -85,7 +85,12 @@ check-commit-log:
   variables:
     GIT_DEPTH: "100"
   script:
-    - ./.gitlab-ci/check-commit-log.sh
+    - if [[ x"$CI_MERGE_REQUEST_TARGET_BRANCH_NAME" != "x" ]] ;
+      then
+        ci-fairy check-commits --junit-xml=commit-message-junit-report.xml ;
+      else
+        echo "Not a merge request" ;
+      fi
   artifacts:
     expire_in: 1 week
     paths:
diff --git a/.gitlab-ci/check-commit-log.sh b/.gitlab-ci/check-commit-log.sh
deleted file mode 100755
index d8b65c195..000000000
--- a/.gitlab-ci/check-commit-log.sh
+++ /dev/null
@@ -1,121 +0,0 @@
-#!/usr/bin/env bash
-
-if [ -z "$CI_MERGE_REQUEST_TARGET_BRANCH_NAME" ]; then
-  echo This is not a merge request, skipping
-  exit 0
-fi
-
-git fetch $CI_MERGE_REQUEST_PROJECT_URL.git $CI_MERGE_REQUEST_TARGET_BRANCH_NAME
-
-branch_point=$(git merge-base HEAD FETCH_HEAD)
-
-commits=$(git log --format='format:%H' $branch_point..$CI_COMMIT_SHA)
-
-if [ -z "$commits" ]; then
-  echo Commit range empty
-  exit 1
-fi
-
-function commit_message_has_mr_url() {
-  commit=$1
-  commit_message=$(git show -s --format='format:%b' $commit)
-  echo "$commit_message" | grep -qe "^$CI_MERGE_REQUEST_PROJECT_URL\/\(-\/\)\?merge_requests\/$CI_MERGE_REQUEST_IID$"
-  return $?
-}
-
-JUNIT_REPORT_TESTS_FILE=$(mktemp)
-
-function append_failed_test_case() {
-  test_name="$1"
-  commit="$2"
-  test_message="$3"
-  commit_short=${commit:0:8}
-
-  echo "<testcase name=\"$test_name: $commit_short\"><failure message=\"$commit_short: $test_message\"/></testcase>" >> $JUNIT_REPORT_TESTS_FILE
-  echo >&2 "Commit check failed: $commit_short: $test_message"
-}
-
-function append_passed_test_case() {
-  test_name="$1"
-  commit="$2"
-  commit_short=${commit:0:8}
-
-  echo "<testcase name=\"$test_name: $commit_short\"></testcase>" >> $JUNIT_REPORT_TESTS_FILE
-}
-
-function generate_junit_report() {
-  junit_report_file="$1"
-  num_tests=$(cat "$JUNIT_REPORT_TESTS_FILE" | wc -l)
-  num_failures=$(grep '<failure' "$JUNIT_REPORT_TESTS_FILE" | wc -l )
-
-  echo Generating JUnit report \"$(pwd)/$junit_report_file\" with $num_tests tests and $num_failures failures.
-
-  cat > $junit_report_file << __EOF__
-<?xml version="1.0" encoding="utf-8"?>
-<testsuites tests="$num_tests" errors="0" failures="$num_failures">
-<testsuite name="commit-review" tests="$num_tests" errors="0" failures="$num_failures" skipped="0">
-$(< $JUNIT_REPORT_TESTS_FILE)
-</testsuite>
-</testsuites>
-__EOF__
-}
-
-function check_commit_message_subject() {
-  commit=$1
-  commit_message_subject=$(git show -s --format='format:%s' $commit)
-
-  if echo "$commit_message_subject" | grep -qe "\(^meta-\|^Meta\)"; then
-    append_failed_test_case meta-prefix $commit \
-      "Commit message subject should not be prefixed with 'meta-' or 'Meta'"
-  else
-    append_passed_test_case meta-prefix $commit
-  fi
-
-  if echo "$commit_message_subject" | grep -qe "\(^clutter-\|^Clutter\)"; then
-    append_failed_test_case clutter-prefix $commit \
-      "Commit message subject should not be prefixed with 'clutter-' or 'Clutter', use 'clutter/' instead"
-  else
-    append_passed_test_case clutter-prefix $commit
-  fi
-
-  if echo "$commit_message_subject" | grep -qe "\(^cogl-\|^Cogl\)"; then
-    append_failed_test_case cogl-prefix $commit \
-      "Commit message subject should not be prefixed with 'cogl-' or 'Cogl', use 'cogl/' instead"
-  else
-    append_passed_test_case cogl-prefix $commit
-  fi
-
-  if echo "$commit_message_subject" | sed -e 's/^[^:]\+: //' | grep -qe '^[[:lower:]]'; then
-    append_failed_test_case capitalization $commit \
-      "Commit message subject should be properly Capitalized. E.g. 'window: Marginalize extradicity'"
-  else
-    append_passed_test_case capitalization $commit
-  fi
-
-  if echo "$commit_message_subject" | grep -qe "\.[ch]:"; then
-    append_failed_test_case not-file-suffix $commit \
-      "Commit message subject prefix should not include .c, .h, etc."
-  else
-    append_passed_test_case not-file-suffix $commit
-  fi
-
-  return 0
-}
-
-RET=0
-for commit in $commits; do
-
-  if commit_message_has_mr_url $commit; then
-    append_failed_test_case superfluous_url $commit \
-      "Commit message must not contain a link to its own merge request"
-  else
-    append_passed_test_case superfluous_url $commit
-  fi
-
-  check_commit_message_subject $commit
-done
-
-generate_junit_report commit-message-junit-report.xml
-
-! grep -q '<failure' commit-message-junit-report.xml
-exit $?
diff --git a/.gitlab-ci/commit-rules.yml b/.gitlab-ci/commit-rules.yml
new file mode 100644
index 000000000..1ae43374c
--- /dev/null
+++ b/.gitlab-ci/commit-rules.yml
@@ -0,0 +1,19 @@
+patterns:
+  deny:
+    - regex: '^$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: '^(meta-|Meta)'
+      message: Commit message subject should not be prefixed with 'meta-' or 'Meta'
+      where: subject
+    - regex: '^(clutter-|Clutter)'
+      message: Commit message subject should not be prefixed with 'clutter-' or 'Clutter', use 'clutter/' instead
+      where: subject
+    - regex: '^(cogl-|Cogl)'
+      message: Commit message subject should not be prefixed with 'cogl-' or 'Cogl', use 'cogl/' instead
+      where: subject
+    - regex: '^[^:]+: [a-z]'
+      message: "Commit message subject should be properly Capitalized. E.g.  'window: Marginalize extradicity'"
+      where: subject
+    - regex: '^\S*\.[ch]:'
+      message: Commit message subject prefix should not include .c, .h, etc.
+      where: subject