ci.yml

name: Build and Publish Docker image
on:
  push:
    branches:
      - main
  pull_request:
jobs:
  metadata:
    runs-on: ubuntu-latest
    outputs:
      matrix: ${{ steps.generate-matrix.outputs.matrix }}
      continue: ${{ steps.generate-matrix.outputs.continue }}
    steps:
      - name: Checkout
        uses: actions/checkout@v2
        with:
          fetch-depth: 2
      - name: generate matrix
        id: generate-matrix
        run: |
          CHANGED_DIRS=$(git diff-tree --no-commit-id --name-only -r ${{ github.sha }} '*Dockerfile' | xargs -I {} dirname {})
          MATRIX_PROJECTS_JSON="["
          MATRIX_INCLUDE_JSON="["

          for DIR in ${CHANGED_DIRS}; do
              MATRIX_PROJECTS_JSON+=$(sed 's/^/"/;s/$/"/' <<< "${DIR}")
              DOCKERFILE="${DIR}/Dockerfile"
              MATRIX_INCLUDE_JSON+="{\"project\": \"${DIR}\", \"dockerfile\": \"${DOCKERFILE}\", \"version\": \"$(grep "FROM --platform" "${DOCKERFILE}" | awk '{ print $3}' | awk -F ':' '{ print $2}' | sed 's/-.*//g')\"}"
          done

          MATRIX_INCLUDE_JSON="${MATRIX_INCLUDE_JSON//\}\{/\}, \{}"
          MATRIX_INCLUDE_JSON+="]"
          MATRIX_PROJECTS_JSON="${MATRIX_PROJECTS_JSON//\"\"/\", \"}"
          MATRIX_PROJECTS_JSON+="]"

          MATRIX_JSON="{\"projects\": ${MATRIX_PROJECTS_JSON}, \"include\": ${MATRIX_INCLUDE_JSON}}"
          echo "${MATRIX_JSON}"
          
          CONTINUE_DOCKER_JOB="no"

          if [[ "${MATRIX_PROJECTS_JSON}" != "[]" ]]; then
            CONTINUE_DOCKER_JOB="yes"
          fi

          echo "::set-output name=continue::${CONTINUE_DOCKER_JOB}"
          echo "::set-output name=matrix::${MATRIX_JSON}"
  docker:
    if: needs.metadata.outputs.continue == 'yes'
    needs: metadata
    runs-on: ubuntu-latest
    strategy:
      matrix: ${{ fromJson(needs.metadata.outputs.matrix) }}
    steps:
      - name: Checkout
        uses: actions/checkout@v2
      - name: Set up QEMU
        uses: docker/setup-qemu-action@v1
      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v1
      - name: Login to GHCR
        uses: docker/login-action@v1
        with:
          registry: ghcr.io
          username: ${{ github.repository_owner }}
          password: ${{ secrets.GHCR_ACCESS_TOKEN }}
      - name: Docker meta
        id: docker_meta
        uses: crazy-max/ghaction-docker-meta@v1
        with:
          images: ghcr.io/frezbo/${{ matrix.project }}
          tag-latest: false
          tag-custom: |
            ${{ matrix.version }}
          tag-custom-only: true
          label-custom: |
            org.opencontainers.image.version=${{ matrix.version }}
      # blocked due to https://github.com/docker/buildx/issues/59
      # - name: Build
      #   uses: docker/build-push-action@v2
      #   with:
      #     context: ${{ matrix.project }}
      #     file: ${{ matrix.dockerfile }}
      #     platforms: linux/amd64,linux/arm64,linux/arm/v6,linux/arm/v7
      #     push: false
      #     # load: true
      #     cache-from: type=local,src=/tmp/.buildx-cache
      #     cache-to: type=local,mode=max,dest=/tmp/.buildx-cache
      #     tags: ${{ steps.docker_meta.outputs.tags }}
      #     labels: |
      #       ${{ steps.docker_meta.outputs.labels }}
      - name: build
        run: |
          docker buildx build --load -t ghcr.io/frezbo/${{ matrix.project }}:${{ matrix.version }} ${{ matrix.project }}
      - name: test
        run: |        
          bash ${{ matrix.project }}/test.sh ${{ matrix.project }} ${{ matrix.version }}
      - name: push
        if: github.event_name != 'pull_request'
        uses: docker/build-push-action@v2
        with:
          context: ${{ matrix.project }}
          file: ${{ matrix.dockerfile }}
          platforms: linux/amd64,linux/arm64,linux/arm/v6,linux/arm/v7
          push: false
          cache-from: type=local,src=/tmp/.buildx-cache
          cache-to: type=local,mode=max,dest=/tmp/.buildx-cache
          tags: ${{ steps.docker_meta.outputs.tags }}
          labels: |
            ${{ steps.docker_meta.outputs.labels }}