This adds a commit message checker, which should fail on this commit …

…subject too long

Change-Id: I47d33b272fff7d93838560ee5e1225b26c956a15

.github/workflows/CI.yml

@@ -40,6 +40,53 @@ jobs:
             2.1.x
             3.1.x
             5.0.x
+      - name: Warn of commit message violations
+        id: commit_message_check
+        shell: bash
+        run: |
+          # This script checks that the commit message is formatted according to the standard:
+          # - First line:      no more than 62 chars and not ending with period (or if it is the
+          #                    only line: no more than 70 chars)
+          # - Second line:     empty
+          # - Following lines: no more than 70 chars          
+          FIRSTLINE_LEN=62
+          LINE_LEN=70
+          ERRORHEADER="⚠️ [POLICY] Your commit message is not formatted correctly."
+          OutputError()
+          {
+            echo $ERRORHEADER >> $GITHUB_STEP_SUMMARY
+            echo $1 >> $GITHUB_STEP_SUMMARY
+          }          
+          # git strips trailing whitespace in the commit message prior to calling this hook
+          COUNT=0
+          cat "$1" | grep --invert-match -E "^#" | while read LINE
+          do          
+            COUNT=$((COUNT + 1))
+            LEN=$(echo "$LINE" | tr -d "\r\n" | wc -c) # don't count \r\n
+            case "$COUNT" in
+              1)
+                if [ $(cat "$1" | sed '/^Change-Id: /d;/^\s*$/d' | wc -l) -gt 1 ]; then
+                  THIS_LINE_LEN=$FIRSTLINE_LEN
+                  MSG="The first line (subject) should be no more than $FIRSTLINE_LEN characters."
+                else
+                  THIS_LINE_LEN=$LINE_LEN
+                  MSG="The first line (subject) should be no more than $LINE_LEN characters if it is the only line."
+                fi
+                if [ $LEN -gt $THIS_LINE_LEN ]; then
+                  OutputError "$MSG" 1
+                elif [ "${LINE:$LEN-1}" = "." ]; then
+                  OutputError "The first line (subject) should not end with a period." 2
+                fi
+              2)
+                if [ $LEN -gt 0 ]; then
+                  OutputError "The second line should be empty." 3
+                fi
+              *)
+                if [ $LEN -gt $LINE_LEN ]; then
+                  OutputError "Subsequent lines (body) should be no more than $LINE_LEN characters." 4
+                fi
+            esac
+          done
           
       - name: Prepare for build
         shell: cmd