version: 2
jobs:
  build:
    docker:
      - image: circleci/golang:1-stretch-browsers-legacy
        environment:
          IMAGE_NAME: "cdalvaro/saltstack-master"

    steps:
      - checkout

      - setup_remote_docker:
          version: 18.03.1-ce

      - run:
          name: Docker info
          command: |
            docker version
            docker info
      - restore_cache:
          keys:
            - cache-v2-{{ .Branch }}
          paths:
            - /tmp/cache/layers.tar

      - run:
          name: Loading docker cache
          command: |
            if [[ -f /tmp/cache/layers.tar ]]; then
              echo "Loading cache ..."
              docker load -i /tmp/cache/layers.tar
              docker image ls
            else
              echo "Couldn't find any caches"
            fi
      - run:
          name: Build docker image
          command: |
            docker build \
              --pull \
              --cache-from=${IMAGE_NAME} \
              --build-arg BUILD_DATE="$(date +"%Y-%m-%d %H:%M:%S%:z")" \
              --build-arg VCS_REF=$(git rev-parse --short HEAD) \
              -t ${IMAGE_NAME}:$(cat VERSION) .
      - run:
          name: Launching container for testing
          command: |
            docker run --rm --detach --name saltstack-master ${IMAGE_NAME}:$(cat VERSION)
            sleep 120
      - run:
          name: Generate docker build image cache
          command: |
            mkdir -p /tmp/cache/
            docker save -o /tmp/cache/layers.tar ${IMAGE_NAME}
      - save_cache:
          key: cache-v2-{{ .Branch }}
          paths:
            - /tmp/cache/layers.tar

workflows:
  version: 2
  build:
    jobs:
      - build