release.yml

name: Create new release diffs
on:
  workflow_dispatch:
    inputs:
      version:
        description: "The version of @backstage/create-app to release. If missing, the latest version will be used"
        required: false
        default: ""
      releaseVersion:
        description: "The version of Backstage to release."
        required: false
jobs:
  release:
    name: Create release branch
    runs-on: ubuntu-latest
    env:
      BACKSTAGE_APP_NAME: backstagediffapp
      VERSION: ${{ github.event.inputs.version }}
    steps:
      - run: echo "🎉 The job was automatically triggered by a ${{ github.event_name }} event."

      # First check out master and run the script that figures out which version of create-app we should use
      - name: Check out repository code
        uses: actions/checkout@v2
      - uses: actions/setup-node@v2
        with:
          node-version: 16
      - name: Check out release base
        uses: actions/checkout@v2
        with:
          ref: "release-base"
      - name: Setup global git bot user
        run: |
          git config --global user.name "github-actions[bot]"
          git config --global user.email "41898282+github-actions[bot]@users.noreply.github.com"
      - name: Run @backstage/create-app
        run: printf "$BACKSTAGE_APP_NAME\n\t" | npx @backstage/create-app@${VERSION} --skip-install
      - name: Remove git repository in app
        run: rm -rf "$(pwd)/$BACKSTAGE_APP_NAME/.git"
      - name: Check current directory
        run: pwd
      - name: Move all the files into the root directory
        run: cp -ar $(pwd)/$BACKSTAGE_APP_NAME/. $(pwd)
      - name: Setup git bot user
        run: |
          git config user.name "github-actions[bot]"
          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
      - id: check_branch
        name: Check if branch already exists
        run: |
          SKIP_DIFF="true" && [[ -z "$(git ls-remote --heads origin release/${VERSION})" ]] && SKIP_DIFF="false"
          echo "::set-output name=skip_create_diff::${SKIP_DIFF}"
      - name: Add release
        run: |
          git checkout -b release/${VERSION}
          git add .
          git reset $BACKSTAGE_APP_NAME
          git commit -m "Release ${VERSION}"
          git push origin release/${VERSION}
        if: steps.check_branch.outputs.skip_create_diff == 'false'
      - run: echo "🍏 This job's status is ${{ job.status }}."
  diff:
    name: Create new diffs
    runs-on: ubuntu-latest
    needs: release
    env:
      RELEASE_VERSION: ${{ github.event.inputs.releaseVersion }}
      NEW_VERSION: ${{ github.event.inputs.version }}

    steps:
      - name: Check out diffs branch
        uses: actions/checkout@v2
        with:
          ref: "master"
          fetch-depth: 0
      - name: Create new diffs
        run: |
          for version in $(jq -r 'to_entries |.[] | .value.createApp // .key'  < releases.json); do
            echo "Creating diffs between version $version and $NEW_VERSION"
            git diff -U1 origin/release/$version..origin/release/$NEW_VERSION > diffs/$version..$NEW_VERSION.diff
          done
      - name: Add new version to release.json
        run: |
          if [ -z "$RELEASE_VERSION" ]; then
            jq ".\"$NEW_VERSION\" = {}" < releases.json > _releases.json
          else
            jq ".\"$RELEASE_VERSION\" = { createApp: \"$NEW_VERSION\"}" < releases.json > _releases.json
          fi
          mv _releases.json releases.json
      - name: Setup git bot user
        run: |
          git config user.name "github-actions[bot]"
          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
      - name: Push the changes
        run: |
          git add .
          git commit -m "Add release ${NEW_VERSION}"
          git push