cherry-pick-via-comment.yml

name: Cherry-pick via Comment

on:
  issue_comment:
    types: [created]

jobs:
  cherry-pick:
    # Only process comments on merged PRs that start with /cherry-pick
    if: ${{ github.event.issue.pull_request && contains(github.event.comment.body, '/cherry-pick') }}
    runs-on: ubuntu-latest
    permissions:
      contents: write
      pull-requests: write
      issues: write

    steps:
      - name: Post Start Comment
        if: always()
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          PR_NUMBER: ${{ github.event.issue.number }}
          PR_LIST: ${{ steps.cherry-pick.outputs.pr_list }}
        run: |
          # Build the URL to the current workflow run
          workflow_url="$GITHUB_SERVER_URL/$GITHUB_REPOSITORY/actions/runs/$GITHUB_RUN_ID"
          comment="✅ Cherry-pick operation is running! Check the progress in this action:\n\n- [Workflow Run]($workflow_url)"

          curl -s -X POST -H "Authorization: token $GITHUB_TOKEN" \
            -H "Accept: application/vnd.github.v3+json" \
            "https://api.github.com/repos/${{ github.repository }}/issues/$PR_NUMBER/comments" \
            -d "{\"body\": \"$comment\"}"

      - name: Checkout Repo
        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
        with:
          token: ${{ secrets.GITHUB_TOKEN }}
          fetch-depth: 0 # Get complete history for cherry-pick

      - name: Setup Git
        run: |
          git config --global user.name 'github-actions[bot]'
          git config --global user.email 'github-actions[bot]@users.noreply.github.com'

      - name: Get PR and Comment Info
        env:
          COMMENT_BODY: ${{ github.event.comment.body }}
          PR_NUMBER: ${{ github.event.issue.number }}
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          echo "Comment: $COMMENT_BODY"
          echo "PR Number: $PR_NUMBER"

      - name: Extract Target Branches
        id: extract-branches
        env:
          COMMENT_BODY: ${{ github.event.comment.body }}
        run: |
          # Use regex to extract branch names
          if [[ "$COMMENT_BODY" =~ /cherry-pick[[:space:]]+([^,]+(,[[:space:]]*[^,]+)*) ]]; then
            branches="${BASH_REMATCH[1]}"
            # Convert comma-separated to space-separated
            branches="${branches//,/ }"
            echo "Extracted branches: $branches"
            echo 2
            # Remove any carriage return characters to ensure valid output format
            echo "branches=$(echo "$branches" | tr -d '\r')" >> $GITHUB_OUTPUT
            echo 3
          else
            echo "No target branches found"
            echo "branches=" >> $GITHUB_OUTPUT
          fi

      - name: Get Merged Commit SHA
        id: get-commit
        env:
          PR_NUMBER: ${{ github.event.issue.number }}
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          REPO: ${{ github.repository }}
        run: |
          # Build correct API URL
          API_URL="https://api.github.com/repos/$REPO/pulls/$PR_NUMBER"
          echo "API URL: $API_URL"

          # Use GitHub API to get merged PR info
          response=$(curl -s "$API_URL")
          # echo "Raw response: $response"
          merge_commit_sha=$(echo "$response" | python3 -c "import sys, json; print(json.load(sys.stdin)['merge_commit_sha'])")
          is_merged=$(echo "$response" | python3 -c "import sys, json; print(json.load(sys.stdin)['merged'])")

          echo "Merge commit SHA: $merge_commit_sha"
          echo "Is merged: $is_merged"

          if [ -z "$merge_commit_sha" ] || [[ "$is_merged" != "True" && "$is_merged" != "true" ]]; then
            echo "Error: PR is not merged or cannot get merge commit SHA"
            exit 1
          fi

          echo "Merge commit SHA: $merge_commit_sha"
          echo "commit_sha=$merge_commit_sha" >> $GITHUB_OUTPUT

      - name: Cherry-pick to Target Branches
        id: cherry-pick
        env:
          TARGET_BRANCHES: ${{ steps.extract-branches.outputs.branches }}
          MERGE_COMMIT_SHA: ${{ steps.get-commit.outputs.commit_sha }}
          PR_NUMBER: ${{ github.event.issue.number }}
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          created_prs=""

          for branch in $TARGET_BRANCHES; do
            echo "Processing branch: $branch"

            # Check if target branch exists
            if ! git show-ref --verify --quiet refs/remotes/origin/$branch; then
              echo "Warning: Branch $branch does not exist, skipping"
              continue
            fi

            # Create new branch name with timestamp to avoid duplicates
            timestamp=$(date +%s)
            new_branch="cherry-pick-$branch-pr-$PR_NUMBER-$timestamp"

            # Create and switch to new branch
            git checkout -b "$new_branch" "origin/$branch"

            # Execute cherry-pick
            if git cherry-pick -x "$MERGE_COMMIT_SHA"; then
              echo "Successfully cherry-picked to $branch"

              # Push new branch
              git push origin "$new_branch"

              # Create PR
              pr_response=$(curl -s -X POST -H "Authorization: token $GITHUB_TOKEN" \
                -H "Accept: application/vnd.github.v3+json" \
                "https://api.github.com/repos/${{ github.repository }}/pulls" \
                -d "{
                  \"title\": \"Cherry-pick PR #$PR_NUMBER to $branch\",
                  \"body\": \"Automatically generated PR to cherry-pick #$PR_NUMBER to $branch branch.\n\nSource PR: #$PR_NUMBER\nSource Commit: $MERGE_COMMIT_SHA\",
                  \"head\": \"$new_branch\",
                  \"base\": \"$branch\"
                }")

              pr_url=$(echo "$pr_response" | grep -o '"html_url":"[^"]*' | cut -d'"' -f4)
              echo "Created PR: $pr_url"

              created_prs="$created_prs\n- $pr_url"
            else
              echo "Failed to cherry-pick to $branch, conflicts may exist"
              git cherry-pick --abort
            fi

            # Return to initial state
            git checkout -
          done

          # Output created PR list
          if [ -n "$created_prs" ]; then
            echo "pr_list=$created_prs" >> $GITHUB_OUTPUT
          fi

      - name: Post Result Comment
        if: always()
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          PR_NUMBER: ${{ github.event.issue.number }}
          PR_LIST: ${{ steps.cherry-pick.outputs.pr_list }}
        run: |
          sleep 2 # wait 2 seconds to ensure the PR is updated
          if [ -n "$PR_LIST" ]; then
            comment="✅ Cherry-pick operation completed!"
          else
            comment="❌ Cherry-pick operation did not create any PRs, please check if the target branches exist or if there are conflicts."
          fi

          curl -s -X POST -H "Authorization: token $GITHUB_TOKEN" \
            -H "Accept: application/vnd.github.v3+json" \
            "https://api.github.com/repos/${{ github.repository }}/issues/$PR_NUMBER/comments" \
            -d "{\"body\": \"$comment\"}"