name: Build

on:
  push:
    branches:
      - main
  pull_request:

concurrency:
  group: ${{ github.workflow }}-$${{ github.head_ref || github.run_id }}
  cancel-in-progress: true

jobs:
  build-nix:
    runs-on: ubuntu-latest
    permissions: write-all
    steps:
      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
        with:
          fetch-depth: 2
      - name: Get changed files
        id: changed-files
        uses: dorny/paths-filter@de90cc6fb38fc0963ad72b210f1f284cd68cea36 # v3.0.2
        with:
          filters: |
            files:
              - '*.nix'
              - 'go.*'
              - '**/*.go'
              - 'integration_test/'
              - 'config-example.yaml'
      - uses: nixbuild/nix-quick-install-action@2c9db80fb984ceb1bcaa77cdda3fdf8cfba92035 # v34
        if: steps.changed-files.outputs.files == 'true'
      - uses: nix-community/cache-nix-action@135667ec418502fa5a3598af6fb9eb733888ce6a # v6.1.3
        if: steps.changed-files.outputs.files == 'true'
        with:
          primary-key: nix-${{ runner.os }}-${{ runner.arch }}-${{ hashFiles('**/*.nix',
            '**/flake.lock') }}
          restore-prefixes-first-match: nix-${{ runner.os }}-${{ runner.arch }}

      - name: Check vendor hash
        id: vendorhash
        if: steps.changed-files.outputs.files == 'true'
        run: |
          nix develop --command -- go run ./cmd/vendorhash check | tee check-result
          {
            grep '^expected_sri=' check-result || true
            grep '^actual_sri='   check-result || true
          } >> "$GITHUB_OUTPUT"

      - name: Vendor hash diverging
        uses: actions/github-script@ed597411d8f924073f98dfc5c65a23a2325f34cd # v8.0.0
        if: failure() && steps.vendorhash.outcome == 'failure'
        with:
          github-token: ${{secrets.GITHUB_TOKEN}}
          script: |
            github.rest.pulls.createReviewComment({
              pull_number: context.issue.number,
              owner: context.repo.owner,
              repo: context.repo.repo,
              body: 'Vendor hash in `flakehashes.json` is stale (was `${{ steps.vendorhash.outputs.expected_sri }}`, should be `${{ steps.vendorhash.outputs.actual_sri }}`). Run `go run ./cmd/vendorhash update` and commit the result.'
            })

      - name: Run nix build
        if: steps.changed-files.outputs.files == 'true'
        run: nix build

      - uses: actions/upload-artifact@330a01c490aca151604b8cf639adc76d48f6c5d4 # v5.0.0
        if: steps.changed-files.outputs.files == 'true'
        with:
          name: headscale-linux
          path: result/bin/headscale
  build-cross:
    runs-on: ubuntu-latest
    strategy:
      matrix:
        env:
          - "GOARCH=arm64 GOOS=linux"
          - "GOARCH=amd64 GOOS=linux"
          - "GOARCH=arm64 GOOS=darwin"
          - "GOARCH=amd64 GOOS=darwin"
    steps:
      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
      - uses: nixbuild/nix-quick-install-action@2c9db80fb984ceb1bcaa77cdda3fdf8cfba92035 # v34
      - uses: nix-community/cache-nix-action@135667ec418502fa5a3598af6fb9eb733888ce6a # v6.1.3
        with:
          primary-key: nix-${{ runner.os }}-${{ runner.arch }}-${{ hashFiles('**/*.nix',
            '**/flake.lock') }}
          restore-prefixes-first-match: nix-${{ runner.os }}-${{ runner.arch }}

      - name: Run go cross compile
        env:
          CGO_ENABLED: 0
        run: env ${{ matrix.env }} nix develop --command -- go build -o "headscale"
          ./cmd/headscale
      - uses: actions/upload-artifact@330a01c490aca151604b8cf639adc76d48f6c5d4 # v5.0.0
        with:
          name: "headscale-${{ matrix.env }}"
          path: "headscale"
