fork-to-branch.yml

name: Fork to Branch

on:
  issue_comment:
    types: [created]

jobs:
  check-comment:
    runs-on: ubuntu-latest
    if: ${{ github.event.issue.pull_request }}
    outputs:
      trigger-comment: ${{ steps.check.outputs.triggered }}
    steps:
      - uses: khan/pull-request-comment-trigger@v1.1.0
        id: check
        with:
          trigger: "create branch from fork"
          prefix_only: "true"

  create_branch:
    runs-on: ubuntu-latest
    needs: [check-comment]
    if: ${{ needs.check-comment.outputs.trigger-comment == 'true' }}
    steps:
      - uses: actions/github-script@v3
        id: get-pr
        with:
          script: |
            const request = {
              owner: context.repo.owner,
              repo: context.repo.repo,
              pull_number: context.issue.number
            }
            core.info(`Getting PR #${request.pull_number} from ${request.owner}/${request.repo}`)
            try {
              const result = await github.pulls.get(request)
              return result.data
            } catch (err) {
              core.setFailed(`Request failed with error ${err}`)
            }

      - name: checkout repository
        uses: actions/checkout@v2
        with:
          fetch-depth: 0
          token: ${{ secrets.GITHUB_TOKEN }}
          ref: ${{ fromJSON(steps.get-pr.outputs.result).head.ref }}
          repository: ${{ fromJSON(steps.get-pr.outputs.result).head.repo.full_name }}

      - name: check if branch exists
        env:
          REF: ${{ fromJSON(steps.get-pr.outputs.result).head.ref }}
          PR_NUMBER: ${{ github.event.issue.number }}
        run: |
          existed_in_repo=$(git ls-remote --heads origin pr/${{ env.REF }}-${{ env.PR_NUMBER }})
          if [[ -z ${existed_in_repo} ]]
          then
            echo "branch pr/${{ env.REF }}-${{ env.PR_NUMBER }} is not exists"
          else
           git push origin --delete pr/${{ env.REF }}-${{ env.PR_NUMBER }}
           echo "branch pr/${{ env.REF }}-${{ env.PR_NUMBER }} deleted" 
          fi

      - name: git remote add upstream
        env:
          OWNER: ${{ fromJSON(steps.get-pr.outputs.result).head.repo.owner.login }}
          REF: ${{ fromJSON(steps.get-pr.outputs.result).head.ref }}
          PR_NUMBER: ${{ github.event.issue.number }}
        run: |
          git remote add upstream https://github.com/amplication/amplication.git
          git fetch --all
          git checkout ${{ env.REF }}
          git checkout -b pr/${{ env.REF }}-${{ env.PR_NUMBER }}
          git push -f --set-upstream upstream pr/${{ env.REF }}-${{ env.PR_NUMBER }}

          echo "Forked branch ${{ env.OWNER }}:${{ env.REF }} has been pushed to branch pr/${{ env.REF }}-${{ env.PR_NUMBER }}"

      - name: create comment
        uses: peter-evans/create-or-update-comment@v2
        env:
          REF: ${{ fromJSON(steps.get-pr.outputs.result).head.ref }}
          PR_NUMBER: ${{ github.event.issue.number }}
        with:
          issue-number: ${{ env.PR_NUMBER }}
          body: |
            The branch 'pr/${{ env.REF }}-${{ env.PR_NUMBER }}' was created!
          reactions: "+1"