name: Refresh builder images

on:
  schedule:
    - cron: '23 4 * * *'
  push:
    branches: [master]
    paths:
      - build/**
      - bin/builder-image
      - helpers/paths.sh
      - helpers/docker-helpers.sh
      - tests/build-isolation.sh
      - .github/workflows/builder-images.yml
  workflow_dispatch:
  pull_request:
    paths:
      - build/**
      - bin/builder-image
      - helpers/paths.sh
      - helpers/docker-helpers.sh
      - tests/build-isolation.sh
      - .github/workflows/builder-images.yml

# Complete each refresh before another can replace its tested image tags.
concurrency:
  group: builder-images-${{ github.event.pull_request.number || 'master' }}
  cancel-in-progress: false

permissions:
  contents: read

jobs:
  # Exercise proposed image changes on native runners with a read-only token.
  # Publishing is a separate master-only job with its own write permission.
  validate:
    if: github.event_name == 'pull_request'
    strategy:
      fail-fast: false
      matrix:
        include:
          - arch: x86_64
            runner: ubuntu-24.04
          - arch: aarch64
            runner: ubuntu-24.04-arm
    runs-on: ${{ matrix.runner }}
    timeout-minutes: 60
    env:
      CONTAINER_ENGINE: docker
      CANDIDATE_IMAGE: omarchy-builder-candidate:${{ matrix.arch }}
    steps:
      - uses: actions/checkout@v4
        with:
          persist-credentials: false
      - name: Build a fresh environment
        run: bin/builder-image build --arch "${{ matrix.arch }}" --mirror edge --tag "$CANDIDATE_IMAGE" --fresh
      - name: Test isolated package builds
        env:
          TEST_BUILDER_IMAGE: ${{ env.CANDIDATE_IMAGE }}
        run: tests/build-isolation.sh

  refresh:
    if: github.repository == 'omacom/omarchy-pkgs' && github.ref == 'refs/heads/master'
    strategy:
      fail-fast: false
      matrix:
        include:
          - arch: x86_64
            runner: ubuntu-24.04
          - arch: aarch64
            runner: ubuntu-24.04-arm
    runs-on: ${{ matrix.runner }}
    timeout-minutes: 60
    permissions:
      contents: read
      packages: write
    env:
      CONTAINER_ENGINE: docker
      REGISTRY_IMAGE: ghcr.io/omacom/omarchy-pkg-builder
      CANDIDATE_IMAGE: omarchy-builder-candidate:${{ matrix.arch }}
    steps:
      - uses: actions/checkout@v4
        with:
          persist-credentials: false
      - name: Build a fresh environment
        run: bin/builder-image build --arch "${{ matrix.arch }}" --mirror edge --tag "$CANDIDATE_IMAGE" --fresh
      - name: Test isolated package builds
        env:
          TEST_BUILDER_IMAGE: ${{ env.CANDIDATE_IMAGE }}
        run: tests/build-isolation.sh
      - name: Publish tested image
        env:
          GH_TOKEN: ${{ github.token }}
          GH_ACTOR: ${{ github.actor }}
          DOCKER_CONFIG: ${{ runner.temp }}/builder-registry-auth
        run: |
          set -euo pipefail
          mkdir -p "$DOCKER_CONFIG"
          trap 'rm -rf "$DOCKER_CONFIG"' EXIT
          printf '%s' "$GH_TOKEN" | docker login ghcr.io --username "$GH_ACTOR" --password-stdin
          key=$(bin/builder-image key --arch "${{ matrix.arch }}" --mirror edge)
          version="$REGISTRY_IMAGE:$key-$GITHUB_RUN_ID-$GITHUB_RUN_ATTEMPT"
          docker tag "$CANDIDATE_IMAGE" "$version"
          docker push "$version"
          # GHCR creates new packages private. Do not advertise an image to
          # fork PRs until it is public. This is a one-time package setting.
          anonymous_config=$(mktemp -d "$RUNNER_TEMP/builder-anonymous.XXXXXX")
          if ! DOCKER_CONFIG="$anonymous_config" docker manifest inspect "$version" >/dev/null; then
            rm -rf "$anonymous_config"
            echo "::error::Make the omacom/omarchy-pkg-builder GHCR package public, then rerun this job. The previous matching image remains selected."
            exit 1
          fi
          rm -rf "$anonymous_config"
          docker tag "$CANDIDATE_IMAGE" "$REGISTRY_IMAGE:$key"
          docker push "$REGISTRY_IMAGE:$key"
          digest=$(docker image inspect "$version" --format '{{index .RepoDigests 0}}')
          printf '### Builder image (%s)\n\nInput key: `%s`\n\nImage: `%s`\n' \
            "${{ matrix.arch }}" "$key" "$digest" >> "$GITHUB_STEP_SUMMARY"