Add git-commit-msg-hook script

The script is verifying if the minimum body length contains
10 characters. Also raise a warning if there is no: "Signed-Off-By".

Signed-off-by: Daniel Pawlik <[email protected]>

Author: danpawlik

.github/workflows/commit-message-validator.yml

@@ -0,0 +1,39 @@
+name: Check if commit message body is not too short
+
+on:
+  pull_request:
+    types: [opened, synchronize, edited, reopened]
+
+jobs:
+  verify-body-length:
+    runs-on: ubuntu-latest
+    # set as non-voting for now.
+    continue-on-error: true
+
+    permissions:
+      contents: write
+      pull-requests: write
+      repository-projects: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Run commit message check
+        id: bodylength
+        run: |
+          set +e
+          ./scripts/git-check-commit-body-length.sh > result.log 2>&1
+          EXIT_CODE=$?
+          echo "exit_code=$EXIT_CODE" >> $GITHUB_OUTPUT
+          cat result.log
+
+      - name: Comment on PR if body length check failed
+        if: steps.bodylength.outputs.exit_code != '0'
+        uses: peter-evans/create-or-update-comment@v5
+        with:
+          issue-number: ${{ github.event.pull_request.number }}
+          body-path: ./result.log
+          reactions: confused

scripts/git-check-commit-body-length.sh

@@ -0,0 +1,40 @@
+#!/bin/bash
+
+MSG_FILE="$1"
+MIN_BODY_LEN=10
+
+# If no file provided, get latest commit message
+if [ -z "$MSG_FILE" ]; then
+    TMP_FILE=$(mktemp)
+    git log -1 --pretty=format:"%B" >"$TMP_FILE"
+    MSG_FILE="$TMP_FILE"
+fi
+
+# 0 = pass, 1 = fail
+FAIL_LENGTH=0
+FAIL_SIGNED_OFF_BY=0
+
+BODY=$(tail -n +3 "$MSG_FILE" | sed '/^\s*#/d' | sed '/^\s*$/d')
+BODY_LEN=$(echo -n "$BODY" | wc -m)
+
+if [ "$BODY_LEN" -lt "$MIN_BODY_LEN" ]; then
+    echo -e "\n\n**WARNING: Commit message body is too short (has $BODY_LEN chars, minimum $MIN_BODY_LEN required).**\n" >&2
+    echo "Please add a detailed explanation after the subject line." >&2
+    FAIL_LENGTH=1
+fi
+
+if ! grep -qi '^Signed-off-by:' "$MSG_FILE"; then
+    echo -e "\n\n**WARNING: Missing 'Signed-off-by:' line in commit message.**\n" >&2
+    echo "Add: Signed-off-by: Your Name <[email protected]>" >&2
+    FAIL_SIGNED_OFF_BY=1
+fi
+
+[ -n "$TMP_FILE" ] && rm -f "$TMP_FILE"
+
+if [ "$FAIL_LENGTH" -eq 0 ] && [ "$FAIL_SIGNED_OFF_BY" -eq 0 ]; then
+    echo "Commit message passes all checks."
+    exit 0
+else
+    echo -e "\nSome checks failed. See warnings above.\n"
+    exit 1
+fi