backport-command.yml

name: backport-command
on:
  repository_dispatch:
    types: [backport-command]
env:
  SCRIPT_DIR: "${{ github.workspace }}/.github/workflows/scripts/backport-command"
  PR_NUMBER: ${{ github.event.client_payload.pull_request.number }}
  ORIG_ISSUE_URL: ${{ github.event.client_payload.github.payload.issue.html_url }}
  TARGET_ORG: ${{ github.event.client_payload.slash_command.args.named.org }}
  TARGET_REPO: ${{ github.event.client_payload.slash_command.args.named.repo }}
  ARG1: ${{ github.event.client_payload.slash_command.args.unnamed.arg1 }}
  MILESTONE_ARG: ${{ github.event.client_payload.slash_command.args.named.milestone }}
  TARGET_FULL_REPO: ${{ github.event.client_payload.slash_command.args.named.org }}/${{ github.event.client_payload.slash_command.args.named.repo }}

jobs:
  # assumptions:
  #   label "kind/backport" exists
  #   the TARGET_REPO has been already forked into the bots account
  #   outputs the source of the comment (PR or issue)
  backport-type:
    outputs:
      commented_on: ${{ steps.get_backport_type.outputs.commented_on }}
      backport_branch: ${{ steps.get_backport_type.outputs.backport_branch }}
      target_milestone: ${{ steps.get_backport_type.outputs.target_milestone }}
    runs-on: ubuntu-latest
    steps:
      - name: checkout
        uses: actions/checkout@v3

      - name: Get type of backport (issue or PR)
        env:
          GITHUB_TOKEN: ${{ secrets.ACTIONS_BOT_TOKEN }}
          CLIENT_PAYLOAD: ${{ toJson(github.event.client_payload) }}
        id: get_backport_type
        run: $SCRIPT_DIR/get_backport_type.sh
        shell: bash

      - name: Failed reaction
        uses: peter-evans/create-or-update-comment@v1
        if: failure()
        with:
          token: ${{ secrets.ACTIONS_BOT_TOKEN }}
          repository: ${{ github.event.client_payload.github.payload.repository.full_name }}
          comment-id: ${{ github.event.client_payload.github.payload.comment.id }}
          reaction-type: "-1"

      - name: Post Error
        if: failure()
        env:
          COMMENTED_ON: ${{ steps.get_backport_type.outputs.commented_on }}
          GITHUB_TOKEN: ${{ secrets.ACTIONS_BOT_TOKEN }}
        run: $SCRIPT_DIR/post_error.sh
        shell: bash

  # creates backport issue if commented on issue, or
  # creates backport PR if commented on PR
  # eg /backport v21.11.x
  type-branch:
    needs: backport-type
    runs-on: ubuntu-latest
    env:
      BACKPORT_BRANCH: ${{ needs.backport-type.outputs.backport_branch }}
    steps:
      - name: checkout
        uses: actions/checkout@v3

      - name: Get user
        env:
          GITHUB_TOKEN: ${{ secrets.ACTIONS_BOT_TOKEN }}
        id: user
        run: |
          username=$(gh api user --jq .login)
          echo ::set-output name=username::"$username"
          echo ::set-output name=repo::"$TARGET_REPO"
          echo ::set-output name=email::"vbot@redpanda.com"

      - name: Get assignees
        env:
          ASSIGNEES: ${{ toJson(github.event.client_payload.github.payload.issue.assignees) }}
        id: assignees
        run: echo ::set-output name=assignees::$(echo "$ASSIGNEES" | jq -r '.[].login' | paste -s -d ',' -)

      - name: Discover and create milestone
        env:
          GITHUB_TOKEN: ${{ secrets.ACTIONS_BOT_TOKEN }}
          TARGET_MILESTONE: ${{ needs.backport-type.outputs.target_milestone }}
        id: create_milestone
        run: $SCRIPT_DIR/create_milestone.sh
        shell: bash

      - name: Create issue
        if: needs.backport-type.outputs.commented_on == 'issue'
        env:
          GITHUB_TOKEN: ${{ secrets.ACTIONS_BOT_TOKEN }}
          TARGET_MILESTONE: ${{ steps.create_milestone.outputs.milestone }}
          ORIG_TITLE: ${{ github.event.client_payload.github.payload.issue.title }}
          ORIG_LABELS: ${{ toJson(github.event.client_payload.github.payload.issue.labels) }}
          ORIG_ASSIGNEES: ${{ steps.assignees.outputs.assignees }}
        id: create_issue
        run: $SCRIPT_DIR/create_issue.sh 
        shell: bash
          
      - name: Get reviewers of PR
        if: needs.backport-type.outputs.commented_on == 'pr'
        env:
          REVIEWERS: ${{ toJson(github.event.client_payload.pull_request.requested_reviewers) }}
        id: reviewers
        run: echo ::set-output name=reviewers::$(echo "$REVIEWERS" | jq -r '.[].login' | paste -s -d ',' -)

      - name: Get commits of PR
        if: needs.backport-type.outputs.commented_on == 'pr'
        env:
          BACKPORT_PR_NUMBER: ${{ github.event.client_payload.pull_request.number }}
          GITHUB_TOKEN: ${{ secrets.ACTIONS_BOT_TOKEN }}
        id: backport_commits
        run: |
          backport_commits=$(gh api "repos/$TARGET_FULL_REPO/pulls/$BACKPORT_PR_NUMBER/commits" --jq .[].sha | paste -s -d ' ' -)
          echo ::set-output name=backport_commits::$backport_commits

      - uses: actions/checkout@v3
        if: needs.backport-type.outputs.commented_on == 'pr'
        with:
          repository: ${{ steps.user.outputs.username }}/${{ steps.user.outputs.repo }}
          token: ${{ secrets.ACTIONS_BOT_TOKEN }}
          path: ./fork

      - name: Backport commits and get details
        if: needs.backport-type.outputs.commented_on == 'pr'
        env:
          GITHUB_TOKEN: ${{ secrets.ACTIONS_BOT_TOKEN }}
          ORIG_TITLE: ${{ github.event.client_payload.github.payload.issue.title }}
          BACKPORT_COMMITS: ${{ steps.backport_commits.outputs.backport_commits }}
          IS_MERGED: ${{ github.event.client_payload.pull_request.merged }}
          PR_BASE_BRANCH: ${{ github.event.client_payload.pull_request.base.ref }}
          REPO_DEFAULT_BRANCH: ${{ github.event.client_payload.pull_request.base.repo.default_branch }}
          GIT_USER: ${{ steps.user.outputs.username }}
          GIT_EMAIL: ${{ steps.user.outputs.email }}
        id: pr_details
        run: $SCRIPT_DIR/pr_details.sh
        shell: bash

      - name: Create pull request
        if: needs.backport-type.outputs.commented_on == 'pr'
        env:
          GITHUB_TOKEN: ${{ secrets.ACTIONS_BOT_TOKEN }}
          TARGET_MILESTONE: ${{ steps.create_milestone.outputs.milestone }}
          ORIG_TITLE: ${{ github.event.client_payload.github.payload.issue.title }}
          ORIG_REVIEWERS: ${{ steps.reviewers.outputs.reviewers }}
          HEAD_BRANCH: ${{ steps.pr_details.outputs.head_branch }}
          FIXING_ISSUE_URLS: ${{ steps.pr_details.outputs.fixing_issue_urls }}
          ORIG_PR_NUMBER: ${{ github.event.client_payload.pull_request.number }}
          ORIG_PR_URL: ${{ github.event.client_payload.pull_request.html_url }}
          GIT_USER: ${{ steps.user.outputs.username }}
        id: create_pr
        run: $SCRIPT_DIR/create_pr.sh 
        shell: bash

      - name: Add reaction
        uses: peter-evans/create-or-update-comment@v1
        with:
          token: ${{ secrets.ACTIONS_BOT_TOKEN }}
          repository: ${{ github.event.client_payload.github.payload.repository.full_name }}
          comment-id: ${{ github.event.client_payload.github.payload.comment.id }}
          reaction-type: hooray

      - name: Failed reaction
        uses: peter-evans/create-or-update-comment@v1
        if: failure()
        with:
          token: ${{ secrets.ACTIONS_BOT_TOKEN }}
          repository: ${{ github.event.client_payload.github.payload.repository.full_name }}
          comment-id: ${{ github.event.client_payload.github.payload.comment.id }}
          reaction-type: "-1"

      - name: Post Error
        if: failure()
        env:
          COMMENTED_ON: ${{ needs.backport-type.outputs.commented_on }}
          GITHUB_TOKEN: ${{ secrets.ACTIONS_BOT_TOKEN }}
        run: $SCRIPT_DIR/post_error.sh
        shell: bash