From be4be30cc8b73f9b7ea1c66a194748b2c31c528d Mon Sep 17 00:00:00 2001
From: Xilai Zhang <xilaizhang@google.com>
Date: Thu, 1 Feb 2024 15:34:44 -0800
Subject: [PATCH] [github actions] ping actor of workflow on cherry pick pr
 creation (#142676)

Context: Follow up from sync with @itsjustkevin today. Tag and ping the actor of workflow, when the cherry pick pull request is successfully created.

1. actor of workflow will be the username of the user that triggered the initial workflow run. i.e., whoever labels the PR. This person might not necessarily be the author of the cherry pick PR.
2. PR number of newly created cherry pick PR is parsed from the output of "gh pr create" as a multi line string.

Tested: on cp success: https://github.com/flutter/flutter/pull/142674 pings the actor of workflow (not the pr author). on cp failure: [example workflow](https://github.com/XilaiZhang/miscellaneous-side-project/actions/runs/7734400373/job/21088324523) leaves a msg on the original PR.
---
 .github/workflows/easy-cp.yml | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/.github/workflows/easy-cp.yml b/.github/workflows/easy-cp.yml
index c10499f1c7a4c..738872428c8a7 100644
--- a/.github/workflows/easy-cp.yml
+++ b/.github/workflows/easy-cp.yml
@@ -57,12 +57,26 @@ jobs:
       - name: Create PR on CP success
         if: ${{ steps.attempt-cp.conclusion == 'success' }}
         working-directory: ./flutter
+        id: create-pr
         run: |
           git push https://${{ env.GITHUB_TOKEN }}@github.com/flutteractionsbot/flutter cp-${CHANNEL}-${COMMIT_SHA}
-          gh pr create --title "[CP-${CHANNEL}]${PR_TITLE}" --body-file ../PULL_REQUEST_CP_TEMPLATE.md --base ${RELEASE_BRANCH} --label "cp: review" --repo flutter/flutter --head flutteractionsbot:cp-${CHANNEL}-${COMMIT_SHA}
+          {
+            echo 'PR_URL<<EOF'
+            gh pr create --title "[CP-${CHANNEL}]${PR_TITLE}" --body-file ../PULL_REQUEST_CP_TEMPLATE.md --base ${RELEASE_BRANCH} --label "cp: review" --repo flutter/flutter --head flutteractionsbot:cp-${CHANNEL}-${COMMIT_SHA}
+            echo EOF
+          } >> "$GITHUB_ENV"
         env:
           GITHUB_TOKEN: ${{ secrets.FLUTTERACTIONSBOT_CP_TOKEN }}
           PR_TITLE: ${{ github.event.pull_request.title }}
+      - name: Leave Comment on CP success
+        if: ${{ steps.create-pr.conclusion == 'success' }}
+        run: |
+          echo $PR_URL
+          NEW_PR_NUMBER="${PR_URL##*/}"
+          SUCCESS_MSG=" @${{ github.actor }} please fill out the PR description above, afterwards the release team will review this request."
+          gh pr comment $NEW_PR_NUMBER -R flutter/flutter -b "${SUCCESS_MSG}"
+        env:
+          GITHUB_TOKEN: ${{ secrets.FLUTTERACTIONSBOT_CP_TOKEN }}
       - name: Leave Comment on CP failure
         if: ${{ failure() && steps.attempt-cp.conclusion == 'failure' }}
         run: |