component-release.yml

name: Publish a versioned release of an infrastructure component

on:
  push:
    branches:
      - 'main'

jobs:

  publish-component:


    runs-on: ubuntu-latest
    steps:

      - uses: actions/checkout@v3
        with:
          fetch-depth: 0

      - name: publish
        shell: bash
        env:
          PUBLISH_REMOTE  : origin
          RELEASE_CHANNEL : latest
        run: |
          git config user.name  "$(git log -1 --format=%cn "$GITHUB_REF")"
          git config user.email "$(git log -1 --format=%ce "$GITHUB_REF")"
          parents=( $(git log -1 --format=%P "$GITHUB_REF") )
          if [[ ${#parents[*]} -gt 1 ]]; then

            # NOTE: This workflow assumes all merges will have exactly two parents.
            # Octopus merges break this assumption and should be avoided.
            merge_head_rev=${parents[1]}
            release_refs=( $(git show-ref | grep "$merge_head_rev" | awk '{print $2}' | grep "^refs/remotes/$PUBLISH_REMOTE/releases/" || true) )

            for ref in "${release_refs[@]}"; do
              branch=${ref#refs/remotes/$PUBLISH_REMOTE/}
              component=$(dirname "${branch#releases/}")
              version=$(basename "${branch#releases/}")
              printf 'info: publishing component: %s %s\n' "$component" "$version"
              "$GITHUB_WORKSPACE"/.sh/publish-component.sh "$component" "$version" "$RELEASE_CHANNEL"
              git push --delete "$PUBLISH_REMOTE" "$branch"
            done

            printf 'info: done publishing components.\n'

          else

            printf 'warn: HEAD is not a merge; skipping release\n'
            exit 0

          fi