.drone.jsonnet

local volumes = [
  {
    name: 'cache',
    host: {
      path: '/var/cache'
    },
  },
  {
    name: 'docker',
    host: {
      path: '/var/cache/${DRONE_REPO}/docker'
    },
  }
];

local prepare = {
  name: 'prepare',
  image: 'busybox',
  commands: [
    'mkdir -p /cache/${DRONE_REPO}/docker'
  ],
  volumes: [
    {
      name: 'cache',
      path: '/cache'
    },
  ]
};
local build(image_tag, when) = {
  name: 'building image by %s' % when,
  image: 'plugins/docker',
  secrets: [ 'docker_username', 'docker_password' ],
  environment:{
    REPO_LOCATION: 'my.registry.com/',
    BASE_VERSION: 'v1.0.0'
  },
  settings: {
    registry: 'https://my.registry.com/',
    username: {
      from_secret: 'docker_username'
    },
    password: {
      from_secret: 'docker_password'
    },
    build_args_from_env: [
      'REPO_LOCATION',
      'BASE_VERSION'
    ],
    repo: 'my.registry.com/repo_name',
    tags: image_tag
  },
  when: {
    event: [ when ],
  },
  volumes: [
    {
      name: 'docker',
      path: '/var/lib/docker'
    }
  ],
};

{
  kind: 'pipeline',
  type: 'docker',
  name: 'build',
  steps: [
    prepare,
    build("${DRONE_BRANCH/\\//-}", "push"),
    build("${DRONE_TAG}", "tag")
  ],
  volumes: volumes
}