ci.yml

on:
  push:
    branches:
      - master
  pull_request:
    paths:
      - '.github/workflows/ci.yml'
      - 'Dockerfile'

name: CI

jobs:
  build-image:
    name: Build and push image
    strategy:
      fail-fast: false
      matrix:
        platform:
          - linux/amd64
          - linux/arm64
    runs-on: ubuntu-latest
    steps:
      - name: Prepare
        run: |
          platform=${{ matrix.platform }}
          echo "PLATFORM_PAIR=${platform//\//-}" >> $GITHUB_ENV
          echo "REGISTRY_IMAGE=`echo ghcr.io/${{github.repository}} | tr '[:upper:]' '[:lower:]'`" >> ${GITHUB_ENV}

      - uses: actions/checkout@v4

      - name: Docker meta
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ env.REGISTRY_IMAGE }}

      - name: Set up Buildx
        uses: docker/setup-buildx-action@v3

      - name: Set up QEMU
        uses: docker/setup-qemu-action@v3
        with:
          platforms: ${{ matrix.platform }}

      - name: Login to ghcr.io
        uses: docker/login-action@v3
        with:
          registry: ghcr.io
          username: ${{ github.repository_owner }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Get current date
        run: |
          echo "CURRENT_TIME=$(TZ=Asia/Tokyo date "+%Y-%m-%d-%H%M%S")" >> $GITHUB_ENV

      - name: Package Cache
        id: cache
        uses: actions/cache@v4
        with:
          key: cache-pkgs-${{ env.PLATFORM_PAIR }}-${{ env.CURRENT_TIME }}
          restore-keys: cache-pkgs-${{ env.PLATFORM_PAIR }}-
          path: |
            tlmgr-pkgs
            var-cache-apt
            var-lib-apt-lists
      
      - name: Cache Docker layers
        uses: actions/cache@v3
        with:
          path: /tmp/.buildx-cache
          key: ${{ runner.os }}-buildx-${{ github.sha }}
          restore-keys: |
            ${{ runner.os }}-buildx-

      - name: inject cache into docker
        # v3.1.2のcommitを指定
        uses: reproducible-containers/buildkit-cache-dance@5b6db76d1da5c8b307d5d2e0706d266521b710de
        with:
          cache-map: |
            {
              "tlmgr-pkgs": "/tlmgr-pkgs",
              "var-cache-apt": "/var/cache/apt",
              "var-lib-apt-lists": "/var/lib/apt/lists"
            }
          skip-extraction: false

      - name: Build and push by digest
        id: build
        uses: docker/build-push-action@v6
        with:
          context: .
          push: ${{ github.event_name != 'pull_request' }}
          platforms: ${{ matrix.platform }}
          labels: ${{ steps.meta.outputs.labels }}
          outputs: type=image,name=${{ env.REGISTRY_IMAGE }},push-by-digest=true,name-canonical=true,push=true
          cache-from: type=local,src=/tmp/.buildx-cache
          cache-to: type=local,dest=/tmp/.buildx-cache-new,mode=ma
          
      - name: Move cache
        run: |
          rm -rf /tmp/.buildx-cache
          mv /tmp/.buildx-cache-new /tmp/.buildx-cache

      - name: Export digest
        run: |
          mkdir -p /tmp/digests
          digest="${{ steps.build.outputs.digest }}"
          touch "/tmp/digests/${digest#sha256:}"

      - name: Upload digest
        uses: actions/upload-artifact@v4
        with:
          name: digests-${{ env.PLATFORM_PAIR }}
          path: /tmp/digests/*
          if-no-files-found: error
          retention-days: 1

  merge:
    if: github.event_name != 'pull_request'
    runs-on: ubuntu-latest
    needs:
      - build-image
    steps:
      - name: Prepare
        run: |
          echo "REGISTRY_IMAGE=`echo ghcr.io/${{github.repository}} | tr '[:upper:]' '[:lower:]'`" >> ${GITHUB_ENV}

      - name: Download digests
        uses: actions/download-artifact@v4
        with:
          path: /tmp/digests
          pattern: digests-*
          merge-multiple: true

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3

      - name: Docker meta
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ env.REGISTRY_IMAGE }}
          tags: |
            type=ref,prefix=pr-,suffix=,event=pr
            type=sha
            type=raw,value=latest,enable=${{ github.ref == format('refs/heads/{0}', github.event.repository.default_branch) }}

      - name: Login to ghcr.io
        uses: docker/login-action@v3
        with:
          registry: ghcr.io
          username: ${{ github.repository_owner }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Create manifest list and push
        working-directory: /tmp/digests
        run: |
          docker buildx imagetools create $(jq -cr '.tags | map("-t " + .) | join(" ")' <<< "$DOCKER_METADATA_OUTPUT_JSON") \
            $(printf '${{ env.REGISTRY_IMAGE }}@sha256:%s ' *)

      - name: Inspect image
        run: |
          docker buildx imagetools inspect ${{ env.REGISTRY_IMAGE }}:${{ steps.meta.outputs.version }}