release-PR-merge-actions.yml

name: Release branch merge actions
on:
  pull_request:
    types: [closed]
    branches:
      - beta
      - production
jobs:
  shared-variables:
    if: github.event.pull_request.merged == true && !contains(github.event.pull_request.labels.*.name, 'no-deploy')
    runs-on: ubuntu-20.04
    outputs:
      tagname: ${{ steps.tagname.outputs.tagname }}
      prerelease: ${{ steps.releaseflags.outputs.prerelease }}
      latestrelease: ${{ steps.releaseflags.outputs.latestrelease }}
    steps:
      - name: Check out repository code
        uses: actions/checkout@v4
      - name: Generate release tag name (as step output)
        id: tagname
        shell: bash
        run: |
          echo "tagname=$(bash ci-scripts/parse-release-branch-name.sh ${{ github.event.pull_request.head.ref }})" >> $GITHUB_OUTPUT
      - name: Fail if variable tagname is empty
        if: ${{ steps.tagname.outputs.tagname == '' }}
        shell: bash
        run: |
          echo "Github output variable tagname is empty. Failing step." && false
      - name: Convert base branch to releaseflags (prerelease and latestrelease)
        id: releaseflags
        shell: bash
        run: |
          echo "prerelease=${{github.event.pull_request.base.ref == 'production' && 'false' || 'true'}}" >> $GITHUB_OUTPUT
          echo "latestrelease=${{github.event.pull_request.base.ref == 'production' && 'true' || 'false'}}" >> $GITHUB_OUTPUT
      - name: Fail if prerelease is empty
        if: ${{ steps.releaseflags.outputs.prerelease == '' }}
        shell: bash
        run: |
          echo "Variable prerelease is empty. Failing step." && false
      - name: Fail if latestrelease is empty
        if: ${{ steps.releaseflags.outputs.latestrelease == '' }}
        shell: bash
        run: |
          echo "Variable prerelease is empty. Failing step." && false
  tag-and-release:
    runs-on: ubuntu-20.04
    needs: [shared-variables]
    permissions:
      contents: write
    env:
      tagmessage: ''
    steps:
      - name: Check out repository code
        uses: actions/checkout@v4
      - name: Generate and store release message
        shell: bash
        run: |
          {
              echo 'tagmessage<<EOF'
              git log --format=%b -n 1
              echo EOF
          } >> "$GITHUB_ENV"
      - name: Git tag
        uses: rickstaa/action-create-tag@v1
        with:
          tag: ${{ needs.shared-variables.outputs.tagname }}
          message: ${{ env.tagmessage }}
      - name: Create github release
        uses: ncipollo/release-action@v1
        with:
          tag: ${{ needs.shared-variables.outputs.tagname }}
          name: 'AGR Curation ${{ needs.shared-variables.outputs.tagname }}'
          prerelease: ${{ needs.shared-variables.outputs.prerelease }}
          makeLatest: ${{ needs.shared-variables.outputs.latestrelease }}
          generateReleaseNotes: true
          skipIfReleaseExists: true
          token: ${{ secrets.GH_PAT }}
  open-mergeback-PR-to-alpha:
    runs-on: ubuntu-20.04
    needs: [shared-variables, tag-and-release]
    permissions:
      contents: write
      pull-requests: write
    env:
      mergeback-headbranchname: "gh-actions-mergeback-${{ needs.shared-variables.outputs.tagname }}-alpha"
      mergeback-basebranchname: "alpha"
    steps:
      - name: Check out repository code
        uses: actions/checkout@v4
        with:
          fetch-depth: 0
          token: ${{ secrets.GH_PAT }}
      - name: create mergeback branch
        run: |
          git checkout -b ${{ env.mergeback-headbranchname }} ${{ needs.shared-variables.outputs.tagname }}
      - name: fetch base branch
        run: |
          git fetch origin ${{ env.mergeback-basebranchname }}:${{ env.mergeback-basebranchname }}
      - name: merge in base branch changes
        id: merge-base
        continue-on-error: true
        run: |
          git config --local user.email "action@github.com"
          git config --local user.name "GitHub Action"
          git merge --no-edit ${{ env.mergeback-basebranchname }}
      - name: Abort merge if merging in base branch failed
        if: ${{ steps.merge-base.outcome == 'failure' }}
        run: |
          git merge --abort
      - name: push mergeback branch to github
        run: |
          git push origin ${{ env.mergeback-headbranchname }}
      - name: open PR
        id: pr-create
        env:
          GH_TOKEN: ${{ secrets.GH_PAT }}
        run: |
          echo "gh-pr-url=$(gh pr create -B ${{ env.mergeback-basebranchname }} -H ${{ env.mergeback-headbranchname }} \
            -t 'Mergeback release ${{ needs.shared-variables.outputs.tagname }} to ${{ env.mergeback-basebranchname }}'\
            -b 'Autogenerated through GH-actions.' -a '${{ github.event.pull_request.user.login }}' -l 'no-deploy')" >> $GITHUB_OUTPUT
      - name: Post notification if automatic merge of base failed
        if: ${{ steps.merge-base.outcome == 'failure' }}
        env:
          GH_TOKEN: ${{ secrets.GH_PAT }}
          pr-comment: |
            GH action detected a potential merge conflict with the base branch (${{ env.mergeback-basebranchname }}).
            @${{ github.event.pull_request.user.login }} please resolve the merge conflict and merge the base branch manually.
        run: |
          gh pr comment ${{ steps.pr-create.outputs.gh-pr-url }} --body "${{ env.pr-comment }}"