apidiff.yaml

---
name: apidiff
on:
  pull_request:

jobs:
  apidiff:
    runs-on: ubuntu-latest
    if: "!contains(github.event.pull_request.labels.*.name, 'breaking change allowed')"
    steps:
    - uses: actions/checkout@v3
      with:
        ref: main
    - uses: actions/setup-go@v3
      with:
        go-version: '1.18.3'
    - name: Install latest apidiff
      run: go install golang.org/x/exp/cmd/apidiff@latest
    - name: Create Go package baseline
      run: apidiff -w pkg.main ./...
    - name: Upload baseline package data
      uses: actions/upload-artifact@v3
      with:
        name: pkg.main
        path: pkg.main
        retention-days: 1
    - uses: actions/checkout@v3
    - name: Download baseline package data
      uses: actions/download-artifact@v3
      with:
        name: pkg.main
    - name: Compare regenerated code to baseline
      run: apidiff -incompatible pkg.main ./... > diff.txt && cat diff.txt && ! [ -s diff.txt ]
    - name: Add breaking change label
      if: ${{ failure() && !github.event.pull_request.head.repo.fork }}
      uses: actions/github-script@v6
      with:
        script: |
          github.rest.issues.addLabels({
            issue_number: ${{ github.event.number }},
            owner: context.repo.owner,
            repo: context.repo.repo,
            labels: ['breaking change']
          })