name: Build Docker images for current branches

on:
  push:
    branches: 
      - master
    paths:
      - .github/workflows/build-docker.yml
  schedule:
    # runs every day
    - cron: '0 0 * * *'
  workflow_dispatch:
    # POST https://api.github.com/repos/qgis/QGIS/actions/workflows/2264135/dispatches:

jobs:
  build-docker:
    runs-on: ubuntu-latest

    env:
      DOCKER_USERNAME: ${{ secrets.DOCKER_USERNAME }}
      DOCKER_PASSWORD: ${{ secrets.DOCKER_PASSWORD }}
      GH_TOKEN: ${{ secrets.GH_TOKEN }}
      CC: /usr/lib/ccache/gcc
      CXX: /usr/lib/ccache/g++ # Building SIP binding freezes with Clang in Docker, maybe a SIP issue, maybe not

    strategy:
      matrix:
        branch: [master, release-3_16]

    steps:
      - name: Cache
        id: cache
        uses: actions/cache@v2.1.4
        with:
          path: ~/.ccache
          key: docker-build-${{ matrix.branch }}

      - name: checkout ${branch}
        uses: actions/checkout@v2
        with:
          ref: ${{ matrix.branch }}

      - name: Build QGIS Docker image for branch ${{ matrix.branch }}
        env:
          branch: ${{ matrix.branch }}
        run: |
          export DOCKER_TAG=${branch//master/latest}
          export DOCKER_BUILD_DEPS_FILE=qgis3-build-deps.dockerfile
          export DOCKER_DEPS_TAG=${DOCKER_TAG}

          echo "branch: ${branch}"
          echo "docker tag: ${DOCKER_TAG}"
          echo "docker deps tag: ${DOCKER_DEPS_TAG}"

          [[ -d ~/.ccache ]] && echo "cache directory (~/.ccache) exists" || mkdir -p ~/.ccache
          # copy ccache dir within QGIS source so it can be accessed from docker
          cp -r ~/.ccache/. ./.ccache_image_build

          echo "##[group] QGIS deps Docker pull/rebuild"
          cd .docker
          docker --version
          docker pull "qgis/qgis3-build-deps:${DOCKER_DEPS_TAG}" || true
          docker build --cache-from "qgis/qgis3-build-deps:${DOCKER_DEPS_TAG}" -t "qgis/qgis3-build-deps:${DOCKER_DEPS_TAG}" -f ${DOCKER_BUILD_DEPS_FILE} .
          echo "push to qgis/qgis3-build-deps:${DOCKER_DEPS_TAG}"
          docker login -u="$DOCKER_USERNAME" -p="$DOCKER_PASSWORD"
          docker push "qgis/qgis3-build-deps:${DOCKER_DEPS_TAG}"
          echo "##[endgroup]"

          echo "##[group] Docker QGIS build"
          DOCKER_BUILD_ARGS="--build-arg DOCKER_DEPS_TAG --build-arg CC --build-arg CXX"
          docker build ${DOCKER_BUILD_ARGS} \
                       --cache-from "qgis/qgis:${DOCKER_TAG}" \
                       -t "qgis/qgis:BUILDER" \
                       -f qgis.dockerfile ..
          echo "##[endgroup]"

          echo "##[group] Tag container and copy cache"
          docker run --name qgis_container qgis/qgis:BUILDER /bin/true
          docker cp qgis_container:/QGIS/build_exit_value ./build_exit_value

          if [[ $(cat ./build_exit_value) != "OK" ]]; then
            echo "Build failed, not pushing image"
            exit 1
          fi

          echo "Copy build cache from Docker container to Travis cache directory"
          rm -rf ~/.ccache/*
          mkdir -p ~/.ccache
          docker cp qgis_container:/QGIS/.ccache_image_build/. ~/.ccache
          echo "Cache size: "$(du -sh ~/.ccache)
          echo "##[endgroup]"

          echo "##[group] Finalize image"
          # enable experimental features in Docker to squash
          echo '{ "experimental": true}' | sudo tee /etc/docker/daemon.json
          sudo service docker restart
          docker build ${DOCKER_BUILD_ARGS} \
                     --cache-from "qgis/qgis:BUILDER" \
                     --squash \
                     -t "qgis/qgis:${DOCKER_TAG}" \
                     -f qgis.dockerfile ..
          echo "##[endgroup]"

          echo "##[group] Pushing image to docker hub"
          docker login -u="$DOCKER_USERNAME" -p="$DOCKER_PASSWORD"
          docker push "qgis/qgis:${DOCKER_TAG}"
          echo "##[endgroup]"

      - name: Trigger PyQGIS API docs build for ${{ matrix.branch }}
        if: success()
        env:
          branch: ${{ matrix.branch }}
        run: |
          echo "##[group] Trigger build of PyQGIS Documentation"
          body='{
            "ref": "master",
            "inputs": {"qgis_branch": "__QGIS_VERSION_BRANCH__"}
          }'
          body=$(sed "s/__QGIS_VERSION_BRANCH__/${branch}/;" <<< $body)
          curl -X POST \
            -H "Accept: application/vnd.github.v3+json" \
            -H "Authorization: token ${GH_TOKEN}" \
            https://api.github.com/repos/qgis/pyqgis/actions/workflows/2246440/dispatches \
            -d "${body}"
          echo "##[endgroup]"