Avoid posting comment multiple times in same PR

action.yml

@@ -60,20 +60,37 @@ runs:
         COMMENTS_URL: ${{ github.event.pull_request.comments_url }}
         COMMITS_URL: ${{ github.event.pull_request.commits_url }}
       run: |
+        if [[ -z "$COMMITS_URL" ]]; then
+          echo "❌ Could not find commits to check. Make sure the action is ran on `pull_request` or `pull_request_target`"
+          exit 1
+        fi
+
         unsigned_commits="$(curl -s -H "Authorization: token $GITHUB_TOKEN" "$COMMITS_URL" | jq '.[] | select(.commit.verification.verified == false) | .commit.message')"
-        if [[ -n "$unsigned_commits" ]]; then
-          echo "Found unsigned commits:"
-          echo "$unsigned_commits"
+        if [[ -z "$unsigned_commits" ]]; then
+          echo "🎉 No unsigned commits found"
+          exit 0
+        fi
 
-          # Escape double quotes and newlines in comment
-          COMMENT_TEXT="$(echo "$COMMENT_TEXT" | sed 's/"/\\"/g' | awk '{printf "%s\\n", $0}')"
+        echo "🚨 Found unsigned commits:"
+        echo "$unsigned_commits"
 
-          curl -X POST $COMMENTS_URL \
-            -H "Content-Type: application/json" \
-            -H "Authorization: token $GITHUB_TOKEN" \
-            --data "{ \"body\": \"$COMMENT_TEXT\" }"
+        if [[ -n "$COMMENTS_URL" ]]; then
+          echo "⏱️ Checking if comment with commit signing instructions was already posted in PR"
 
-          exit 1
+          if curl -sf -H "Authorization: token $GITHUB_TOKEN" "$COMMENTS_URL" | jq -e --arg comment_text "$(echo "$COMMENT_TEXT" | tr -cd '[:alnum:]')" 'any(.[]; .body | gsub("[^[:alnum:]]"; "") == $comment_text)'; then
+            echo "✅ Comment already exists in PR, not posting it again"
+          else
+            echo "📤 Posting PR comment with commit signing instructions"
+
+            # Escape double quotes and newlines in comment
+            COMMENT_TEXT="$(echo "$COMMENT_TEXT" | sed 's/"/\\"/g' | awk '{printf "%s\\n", $0}')"
+
+            curl -X POST "$COMMENTS_URL" \
+              -H "Content-Type: application/json" \
+              -H "Authorization: token $GITHUB_TOKEN" \
+              --data "{ \"body\": \"$COMMENT_TEXT\" }"
+          fi
         fi
 
-        echo "No unsigned commits found 🎉"
+        echo "❌ Returning with exit code 1 because of unsigned commits"
+        exit 1