name: Build Docker image

on:
  push:
    branches:
      - master
  release:
    types:
      - created

env:
  DOCKER_IMAGE: archivebox-ci


jobs:
  buildx:
    runs-on: ubuntu-latest
    steps:
      - name: Docker Login
        uses: docker/login-action@v1
        with:
           username: ${{ secrets.DOCKER_USERNAME }}
           password: ${{ secrets.DOCKER_PASSWORD }}
      
      - name: Checkout
        uses: actions/checkout@v2
        with:
          submodules: true
          fetch-depth: 1

      - name: Set up QEMU
        uses: docker/setup-qemu-action@v1
      
      - name: Set up Docker Buildx
        id: buildx
        uses: docker/setup-buildx-action@v1
        with:
          version: latest
          install: true
      
      - name: Builder instance name
        run: echo ${{ steps.buildx.outputs.name }}
      
      - name: Available platforms
        run: echo ${{ steps.buildx.outputs.platforms }}
      
      - name: Cache Docker layers
        uses: actions/cache@v2
        with:
          path: /tmp/.buildx-cache
          key: ${{ runner.os }}-buildx-${{ github.sha }}
          restore-keys: |
            ${{ runner.os }}-buildx-
      
      - name: Prepare tags to publish
        id: prep
        run: |
          # Always publish to latest.
          TAGS="${{ secrets.DOCKER_USERNAME }}/archivebox:latest,archivebox/archivebox:latest"
          if [[ $GITHUB_REF == refs/tags/* ]]; then
            VERSION="${GITHUB_REF#refs/tags/}"
            MINOR=${VERSION%.*}
            MAJOR=${MINOR%.*}
            TAGS="$TAGS,${{ secrets.DOCKER_USERNAME }}/archivebox:$VERSION,archivebox/archivebox:$VERSION"
            TAGS="$TAGS,${{ secrets.DOCKER_USERNAME }}/archivebox:$MINOR,archivebox/archivebox:$MINOR"
            TAGS="$TAGS,${{ secrets.DOCKER_USERNAME }}/archivebox:$MAJOR,archivebox/archivebox:$MAJOR"
          else
            VERSION=$GITHUB_SHA
            TAGS="$TAGS,${{ secrets.DOCKER_USERNAME }}/archivebox:$VERSION,archivebox/archivebox:$VERSION"
          fi

          echo ::set-output name=tags::${TAGS}
        env:
          GITHUB_REF: ${{ github.ref }}
          GITHUB_SHA: ${{ github.sha }}
      
      - name: Build and push
        id: docker_build
        uses: docker/build-push-action@v2
        with:
          context: ./
          file: ./Dockerfile
          builder: ${{ steps.buildx.outputs.name }}
          push: true
          tags: ${{ steps.prep.outputs.tags }}
          cache-from: type=local,src=/tmp/.buildx-cache
          cache-to: type=local,dest=/tmp/.buildx-cache
          platforms: linux/amd64,linux/arm64,linux/arm/v7

      - name: Image digest
        run: echo ${{ steps.docker_build.outputs.digest }}