build.yml

# ~~ Generated by projen. To modify, edit .projenrc.js and run "npx projen".

name: build
on:
  pull_request: {}
  workflow_dispatch: {}
jobs:
  build:
    runs-on: ubuntu-latest
    permissions:
      contents: write
    outputs:
      self_mutation_happened: ${{ steps.self_mutation.outputs.self_mutation_happened }}
    env:
      CI: "true"
    steps:
      - name: Checkout
        uses: actions/checkout@v4
        with:
          ref: ${{ github.event.pull_request.head.ref }}
          repository: ${{ github.event.pull_request.head.repo.full_name }}
      - name: Install dependencies
        run: npm install
      - name: build
        run: npx projen build
      - name: Find mutations
        id: self_mutation
        run: |-
          git add .
          git diff --staged --patch --exit-code > repo.patch || echo "self_mutation_happened=true" >> $GITHUB_OUTPUT
        working-directory: ./
      - name: Upload patch
        if: steps.self_mutation.outputs.self_mutation_happened
        uses: actions/upload-artifact@v4.4.0
        with:
          name: repo.patch
          path: repo.patch
          overwrite: true
      - name: Fail build on mutation
        if: steps.self_mutation.outputs.self_mutation_happened
        run: |-
          echo "::error::Files were changed during build (see build log). If this was triggered from a fork, you will need to update your branch."
          cat repo.patch
          exit 1
  self-mutation:
    needs: build
    runs-on: ubuntu-latest
    permissions:
      contents: write
    if: always() && needs.build.outputs.self_mutation_happened && !(github.event.pull_request.head.repo.full_name != github.repository)
    steps:
      - name: Generate token
        id: generate_token
        uses: tibdex/github-app-token@3beb63f4bd073e61482598c45c71c1019b59b73a
        with:
          app_id: ${{ secrets.PROJEN_APP_ID }}
          private_key: ${{ secrets.PROJEN_APP_PRIVATE_KEY }}
      - name: Checkout
        uses: actions/checkout@v4
        with:
          token: ${{ steps.generate_token.outputs.token }}
          ref: ${{ github.event.pull_request.head.ref }}
          repository: ${{ github.event.pull_request.head.repo.full_name }}
      - name: Download patch
        uses: actions/download-artifact@v4
        with:
          name: repo.patch
          path: ${{ runner.temp }}
      - name: Apply patch
        run: '[ -s ${{ runner.temp }}/repo.patch ] && git apply ${{ runner.temp }}/repo.patch || echo "Empty patch. Skipping."'
      - name: Set git identity
        run: |-
          git config user.name "github-actions"
          git config user.email "github-actions@github.com"
      - name: Push changes
        env:
          PULL_REQUEST_REF: ${{ github.event.pull_request.head.ref }}
        run: |-
          git add .
          git commit -s -m "chore: self mutation"
          git push origin HEAD:$PULL_REQUEST_REF