docker:
  image: docker:latest

  stage: build

  services:
    - docker:dind

  variables:
    VERSION: latest
    CACHETAG: build-${VERSION}
    DOCKER_HOST: tcp://docker:2375

  tags:
    - docker
    - x86_64
  only:
    - master

  before_script:
    - docker info
    - docker version
    - echo "$CI_JOB_TOKEN" | docker login -u "$CI_REGISTRY_USER" "$CI_REGISTRY" --password-stdin
    - if [ -n "$GITHUB_TOKEN" ]; then cat $GITHUB_TOKEN |base64 -d > auth.json; fi

  script:
    - if [ -f init ]; then chmod 500 init; fi
    - ([ -z "$REFRESH" ] && docker pull ${CI_REGISTRY_IMAGE}:${CACHETAG}) || echo "true"
    - echo -n ${CI_COMMIT_SHORT_SHA} > VERSION
    - docker build --cache-from ${CI_REGISTRY_IMAGE}:${CACHETAG} -t ${CI_REGISTRY_IMAGE}:${VERSION} -t ${CI_REGISTRY_IMAGE}:${CACHETAG} .
    - docker push ${CI_REGISTRY_IMAGE}:${VERSION}
    - docker push ${CI_REGISTRY_IMAGE}:${CACHETAG}