version: 2
jobs:
  build:
    machine: true
    steps:
      - checkout
      - run: 
          command: |
            docker pull adferrand/backuppc || true
            docker build --pull --cache-from adferrand/backuppc -t adferrand/backuppc .
      - run:
          command: |
            mkdir -p workspace
            docker save adferrand/backuppc > workspace/docker-backuppc.tar
      - persist_to_workspace:
          root: workspace
          paths:
            - docker-backuppc.tar
  test:
    machine: true
    steps:
      - attach_workspace:
          at: /tmp/workspace
      - run:
          command:
            docker load < /tmp/workspace/docker-backuppc.tar
      - run:
          command:
            docker run --rm adferrand/backuppc echo 'Hello World!'
  deploy:
    machine: true
    steps:
      - attach_workspace:
          at: /tmp/workspace
      - run:
          command:
            docker load < /tmp/workspace/docker-backuppc.tar
      - run:
          command:
            echo "${DOCKER_PASS}" | docker login -u ${DOCKER_USER} --password-stdin
      - deploy: 
          command: |
            if [ ${CIRCLE_BRANCH} = master ]; then DOCKER_TAG=latest; else DOCKER_TAG=${CIRCLE_TAG:-${CIRCLE_BRANCH}}; fi
            docker tag adferrand/backuppc adferrand/backuppc:${DOCKER_TAG}
            docker push adferrand/backuppc:${DOCKER_TAG}
workflows:
  version: 2
  build-n-deploy:
    jobs:
      - build:
          filters:
            tags:
              only: /^[0-9.]+/
      - test:
          requires: 
            - build
          filters:
            tags:
              only: /^[0-9.]+/
      - deploy:
          requires: 
            - test
          filters:
            branches:
              only: /^(master|4|3)$/
            tags:
              only: /^[0-9.]+/