ci: T4748: add a CI action to check pull request title

and commit messages format

2 files changed, 67 insertions, 0 deletions

diff --git a/.github/workflows/pull-request-message-check.yml b/.github/workflows/pull-request-message-check.yml
new file mode 100644
index 000000000..8c206a5ab
--- /dev/null
+++ b/.github/workflows/pull-request-message-check.yml
@@ -0,0 +1,23 @@
+---
+name: Check pull request message format
+
+on:
+  pull_request:
+    branches:
+      - current
+      - crux
+      - equuleus
+
+jobs:
+  check-pr-title:
+    name: Check pull request title
+    runs-on: ubuntu-20.04
+    steps:
+      - uses: actions/checkout@v2
+        timeout-minutes: 2
+      - name: Install the requests library
+        run: pip3 install requests
+      - name: Check the PR title
+        timeout-minutes: 2
+        run: |
+          ./scripts/check-pr-title-and-commit-messages.py '${{ github.event.pull_request.url }}'
diff --git a/scripts/check-pr-title-and-commit-messages.py b/scripts/check-pr-title-and-commit-messages.py
new file mode 100755
index 000000000..c30c3ef1f
--- /dev/null
+++ b/scripts/check-pr-title-and-commit-messages.py
@@ -0,0 +1,44 @@
+#!/usr/bin/env python3
+
+import re
+import sys
+
+import requests
+from pprint import pprint
+
+# Use the same regex for PR title and commit messages for now
+title_regex = r'^(([a-zA-Z]+:\s)?)T\d+:\s+[^\s]+.*'
+commit_regex = title_regex
+
+def check_pr_title(title):
+    if not re.match(title_regex, title):
+        print("PR title '{}' does not match the required format!".format(title))
+        print("Valid title example: T99999: make IPsec secure")
+        sys.exit(1)
+
+def check_commit_message(title):
+    if not re.match(commit_regex, title):
+        print("Commit title '{}' does not match the required format!".format(title))
+        print("Valid title example: T99999: make IPsec secure")
+        sys.exit(1)
+
+if __name__ == '__main__':
+    if len(sys.argv) < 2:
+        print("Please specify pull request URL!")
+        sys.exit(1)
+
+    # Get the pull request object
+    pr = requests.get(sys.argv[1]).json()
+    if "title" not in pr:
+        print("Did not receive a valid pull request object, please check the URL!")
+        sys.exit(1)
+
+    check_pr_title(pr["title"])
+
+    # Get the list of commits
+    commits = requests.get(pr["commits_url"]).json()
+    for c in commits:
+        # Retrieve every individual commit and check its title
+        co = requests.get(c["url"]).json()
+        check_commit_message(co["commit"]["message"])
+