cherry-pick.yml

name: Cherry-pick a release

on:
  workflow_call:
    inputs:
      amp-version:
        description: AMP version (13 digits)
        required: true
        type: string
      shas:
        description: commit sha(s) to cherry-pick with (i.e. abcdef1 abcdef2)
        required: true
        type: string
    secrets:
      access-token:
        description: 'Personal access token for the bot that will create the pull requests'
        required: true

  workflow_dispatch:
    inputs:
      amp-version:
        description: AMP version (13 digits)
        required: true
        type: string
      shas:
        description: commit sha(s) to cherry-pick with (i.e. abcdef1 abcdef2)
        required: true
        type: string

jobs:
  cherry-pick:
    runs-on: ubuntu-latest

    steps:
      - name: Checkout ampproject/amphtml
        uses: actions/checkout@eef61447b9ff4aafe5dcd4e0bbf5d482be7e7871 # v4
        with:
          repository: ampproject/amphtml
          fetch-depth: 0
          token: ${{ secrets.ACCESS_TOKEN }}

      - name: Generate cherry-pick branch name
        id: get-branch
        run: |
          # get amp version to be cherry-picked
          AMP_VERSION=${{ github.event.inputs.amp-version }}

          # get number of commits to cherry-pick
          read -r -a SHAS_ARRAY <<< "${{ github.event.inputs.shas }}"
          SHAS_COUNT=${#SHAS_ARRAY[@]}

          # get number of current cherry-picks by taking the last 3 digits
          CURRENT_CP_COUNT=${AMP_VERSION:10:13}

          # add commits to cherry-pick to current cherry-picks, and then pad with 00
          # i.e. if there are 10 cherry-picks total, NEW_CP_COUNT would be 0010
          NEW_CP_COUNT=00$(expr $CURRENT_CP_COUNT + $SHAS_COUNT)

          # set the cherry-picked amp version to be the first 10 digits of the current amp version,
          # then the last 3 digits of the total cherry-picks
          # i.e. if there are 10 cherry-picks total, the last 3 digits would be 010
          CHERRY_PICK_BRANCH=amp-release-${AMP_VERSION:0:10}${NEW_CP_COUNT: -3}
          echo "branch=${CHERRY_PICK_BRANCH}" >> $GITHUB_OUTPUT

      - name: Set git config
        run: |
          NAME=$(git --no-pager log --format=format:'%an' -n 1)
          EMAIL="$(git --no-pager log --format=format:'%ae' -n 1)"
          git config --global user.name $NAME
          git config --global user.email $EMAIL

      - name: Cherry-pick ${{ github.event.inputs.amp-version }} with ${{ github.event.inputs.shas }}
        run: |
          git checkout -b ${{ steps.get-branch.outputs.branch }} ${{ github.event.inputs.amp-version }}
          git cherry-pick -x ${{ github.event.inputs.shas }}
          git push --set-upstream https://github.com/ampproject/amphtml.git ${{ steps.get-branch.outputs.branch }}

  create-issue-on-error:
    if: failure()
    needs: cherry-pick
    permissions:
      contents: read
      issues: write
    runs-on: ubuntu-latest

    steps:
      - uses: actions/checkout@eef61447b9ff4aafe5dcd4e0bbf5d482be7e7871 # v4
      - name: Create issue on error
        uses: JasonEtco/create-an-issue@v2
        with:
          filename: .github/create_issue_on_error.md
        env:
          GITHUB_TOKEN: ${{ secrets.ACCESS_TOKEN }}
          WORKFLOW_NAME: ${{ github.workflow }}
          MENTION: '@ampproject/release-on-duty'
          REPO_SLUG: ${{ github.repository }}
          RUN_ID: ${{ github.run_id }}