nuxeo-create-release-branch.yml

name: Create nuxeo release branch
on:
  workflow_dispatch:
    inputs:
      gwt-version:
        description: 'GWT version to update to (tag in upstream GWT repo)'
        required: true
      gha-runner-label:
        description: 'GitHub runner label on which performing the jobs'
        required: false
        default: 'ubuntu-latest'
permissions: write-all
jobs:
  main:
    runs-on: ${{ inputs.gha-runner-label }}
    env:
      # secrets
      CACHIX_AUTH_TOKEN: ${{secrets.CACHIX_AUTH_TOKEN }}
      GH_TOKEN: ${{ secrets.REPO_PAT || github.token }}
      # variables
      GWT_VERSION: ${{ github.event.inputs.gwt-version }}
      NUXEO_RELEASE_BRANCH: nuxeo/release/${{ github.event.inputs.gwt-version }}
      NUXEO_PRERELEASE_BRANCH: nuxeo/pre-release/${{ github.event.inputs.gwt-version }}
    steps:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 50
          token: ${{ secrets.REPO_PAT || github.token }}

      - name: Check if release branch exists
        id: check_branch
        run: |
          cat <<~ | tee -a "${GITHUB_OUTPUT}"
          exists=$( git ls-remote --exit-code --heads origin $NUXEO_RELEASE_BRANCH > /dev/null && echo 'true' || echo 'false' )
          ~
        shell: /usr/bin/bash -ex -o pipefail {0}

      - name: Exit if branch exists
        if: steps.check_branch.outputs.exists == 'true'
        run: |
          cat <<~
          Error: Release branches already exists.

          Please delete the following branches before running this workflow again:

          $ git push origin :$NUXEO_RELEASE_BRANCH
          $ git push origin :$NUXEO_PRERELEASE_BRANCH
          ~
          exit 1
        shell: /usr/bin/bash -ex -o pipefail {0}

      - name: Enable tmate session
        if: runner.debug
        uses: mxschmitt/action-tmate@v3
        with:
          detached: true

      - name: Set up Nix Development Environment
        uses: ./.github/actions/nix-develop
        with:
          cachix-auth-token: ${{ secrets.CACHIX_AUTH_TOKEN }}
          github-token: ${{ secrets.GITHUB_TOKEN }}

      - name: Create release branches and apply Nuxeo changes
        run: |
          git config user.name github-actions
          git config user.email github-actions@github.com

          : Check if upstream remote exists, if not add it
          if ! git remote | grep -q '^upstream$'; then
            git remote add upstream https://github.com/gwtproject/gwt.git
          fi

          : Fetch the upstream and get the last common commit
          git fetch upstream main
          git fetch upstream tag $GWT_VERSION

          COMMON_ANCESTOR=$(git merge-base HEAD upstream/main)

          : Create and push the release branch based on the GWT version tag
          git checkout -b $NUXEO_RELEASE_BRANCH $GWT_VERSION
          git push -f origin $NUXEO_RELEASE_BRANCH

          : Cherry-pick patch branch commits and push it
          git checkout -b $NUXEO_PRERELEASE_BRANCH $NUXEO_RELEASE_BRANCH

          : Create and apply patch, then create commit message
          if git diff ${COMMON_ANCESTOR}..nuxeo/main | 
             tee >(git apply --quiet --whitespace=fix) >(grep -q .) > /dev/null; then
            SQUASH_MSG=$(cat <<EOF | cut -c 3-
            Squashed changes from nuxeo/main

            Original commits:
            $(git log --format="- %h: %s" $COMMON_ANCESTOR..nuxeo/main)
          EOF
            )
          else
            echo "No changes to apply or patch application failed."
            exit 1
          fi
          git add .
          git commit -m "$SQUASH_MSG"
          git push -f origin $NUXEO_PRERELEASE_BRANCH
        shell: /usr/bin/bash -ex -o pipefail {0}

      - name: Create Pull Request
        run: |
          nix develop .devenv -c bash -xe -o pipefail <<~
            : Checking GitHub CLI authentication...
            [[ -z "$GH_TOKEN" ]] && exit 1
            gh auth status
            : Listing accessible repositories...
            gh repo list
            : Creating pull request...
            gh pr create \
              --repo "$GITHUB_REPOSITORY" \
              --base "$NUXEO_RELEASE_BRANCH" \
              --head "$NUXEO_PRERELEASE_BRANCH" \
              --title "Apply Nuxeo-specific changes to GWT $GWT_VERSION" \
              --body "This PR applies Nuxeo-specific changes to the GWT $GWT_VERSION release. Please review the changes and merge if everything looks correct."
          ~