cross-merge.yml

name: Ibexa Reusable / Cross Org PR

on:
  workflow_call:
    secrets:
      robot-token:
        description: 'A PAT token used by the app/robot'
        required: true

jobs:
  job:
    runs-on: ubuntu-latest

    steps:
        - uses: actions/checkout@v3
          with:
            fetch-depth: 0
            token: ${{ secrets.robot-token }}

        - name: Inject slug/short variables
          uses: rlespinasse/github-slug-action@v3.x

        - name: Get merge map
          uses: octokit/request-action@v2.x
          id: map
          # Allow failures to be ignored.
          # We will consider output as empty
          continue-on-error: true
          with:
            owner: ibexa
            repo: cross-merge-map
            route: /repos/{owner}/{repo}/contents/${{ github.repository }}
          env:
            GITHUB_TOKEN: ${{ secrets.robot-token }}

        # Parse json and find destination branch and repository
        - name: Set destination variables
          id: destinations
          if: ${{ steps.map.outputs.data }}
          run: |
            cat > input.json <<'EOF'
            ${{ steps.map.outputs.data }}
            EOF
            jq -r '.["content"]' input.json | base64 --decode | jq -c . > map.json
            echo Looking for destination for branch ${{ env.GITHUB_REF_SLUG }}
            branch=$(jq -r '.["${{ env.GITHUB_REF_SLUG }}"] | select (.!=null)' map.json)
            echo Destination branch found. It is ${branch}
            repo=$(jq -r '.DEST' map.json)
            destination=temp_${{ env.GITHUB_REF_SLUG }}_to_$branch
            echo "branch=$branch" >> $GITHUB_OUTPUT
            echo "repo=$repo" >> $GITHUB_OUTPUT
            echo "destination=$destination" >> $GITHUB_OUTPUT

        - name: Push updated code to temporary branch
          if: ${{ steps.destinations.outputs.branch }}
          env:
            TOKEN: ${{ secrets.robot-token }}
            REPO: ${{ steps.destinations.outputs.repo }}
            DEST_BRANCH: ${{ steps.destinations.outputs.destination }}
          run: |
            git remote add cross https://x-access-token:${{ env.TOKEN }}@github.com/${{ env.REPO }}
            # todo: implement generating *unique* temp branch
            # todo: check if *previous* temp branch exists
            git push cross HEAD:${{ env.DEST_BRANCH }} 2>&1

        - name: Create Pull Request in Destination Repository
          if: ${{ steps.destinations.outputs.branch }}
          continue-on-error: true
          env:
            GITHUB_TOKEN: ${{ secrets.robot-token }}
            REPO: ${{ steps.destinations.outputs.repo }}
            DEST_BRANCH: ${{ steps.destinations.outputs.destination }}
            SRC_BRANCH: ${{ steps.destinations.outputs.branch }}
          run: |
            # Remove "cross" remote that we just added
            # If we don't, `gh pr` will break as it will try to read commits from all remotes
            git remote rm cross
            gh pr create --base ${{ env.SRC_BRANCH }} --head ${{ env.DEST_BRANCH }} \
              --title "Merge branch '${{ env.GITHUB_REF_SLUG }}' of ${{ github.repository }} into ${{ env.SRC_BRANCH }}" --body "Cross merge PR" \
              -R ${{ env.REPO }}