name: Build Container

on:
  push:
    branches-ignore:
      - master
  pull_request:
    branches:
      - master

jobs:
  check:
    runs-on: ubuntu-latest
    outputs:
      is_new: ${{ steps.check_ver.outputs.is_new }}
      version: ${{ steps.check_ver.outputs.version }}
    steps:
      - name: Check version
        id: check_ver
        run: |
          get_ver() (curl -s "$@" | grep -Po "(\d+\.)+\d+\-r\d+" | head -1)
          OLD_VER=$(get_ver ${GHCO_URL})
          NEW_VER=$(get_ver ${ALPINE_PKG_URL})
          if [ "$NEW_VER" != "$OLD_VER" ]; then
            echo "::set-output name=is_new::true"
          else
            echo "::set-output name=is_new::false"
          fi
          echo "::set-output name=version::${NEW_VER}"
        env:
          ALPINE_PKG_URL: https://pkgs.alpinelinux.org/package/edge/testing/x86_64/qbittorrent-nox
          GHCO_URL: https://github.com/mogeko/docker-qbittorrent/pkgs/container/qbittorrent

  build:
    runs-on: ubuntu-latest
    needs: check
    if: ${{ needs.check.outputs.is_new }}
    permissions:
      packages: write
      contents: read
    steps:
      - name: Checkout
        uses: actions/checkout@v2
        with:
          fetch-depth: 0

      - name: Build image
        run: |
          docker build . \
            --build-arg "VERSION=${{ needs.check.outputs.version }}" \
            --label "BUILD_ID=${GITHUB_RUN_ID}" \
            --label "BUILD_SERVER=${GITHUB_SERVER_URL}" \
            --label "OS=${RUNNER_OS}" \
            --tag qbittorrent
      
      - name: Save status
        run: docker images > ${{ github.workspace }}/images.txt

      - name: Update status
        uses: actions/upload-artifact@v2
        with:
          name: images
          path: ${{ github.workspace }}/images.txt