name: Codegen Drift Check

on:
  pull_request:
    types: [opened, synchronize, reopened]
    paths:
      - 'api/**'
      - 'pkg/apis/**'
      - 'pkg/generated/**'
      - 'internal/crdinstall/manifests/**'
      - 'packages/system/cozystack-controller/definitions/**'
      - 'packages/system/application-definition-crd/definition/**'
      - 'packages/system/backup-controller/definitions/**'
      - 'packages/system/backupstrategy-controller/definitions/**'
      - 'hack/update-codegen.sh'
      - 'hack/boilerplate.go.txt'
      - 'Makefile'
      - 'go.mod'
      - 'go.sum'
      - '.github/workflows/codegen-drift.yml'

concurrency:
  group: codegen-drift-${{ github.workflow }}-${{ github.event.pull_request.number }}
  cancel-in-progress: true

jobs:
  codegen-drift:
    name: Verify generated code is up to date
    runs-on: ubuntu-22.04
    steps:
      - name: Checkout code
        uses: actions/checkout@v4

      - name: Set up Go
        uses: actions/setup-go@v5
        with:
          go-version-file: go.mod
          cache: true

      - name: Pre-fetch k8s.io/code-generator module
        # hack/update-codegen.sh sources kube_codegen.sh from the Go module cache.
        # The module is not declared in go.mod, so fetch it explicitly at the
        # version pinned in the script.
        run: |
          version=$(grep -oP 'code-generator@\Kv[0-9.]+' hack/update-codegen.sh)
          tmpdir=$(mktemp -d)
          cd "$tmpdir"
          go mod init codegen-fetch
          go get "k8s.io/code-generator@${version}"

      - name: Run make generate
        run: make generate

      - name: Fail on drift
        run: |
          if [ -n "$(git status --porcelain)" ]; then
            echo "::error::'make generate' produced changes. Run 'make generate' locally and commit the result."
            git status --short
            git diff --color=always
            exit 1
          fi