base/.gitlab-ci.yml

image: docker:latest

stages:
- test
- build

variables:
  VERSION: "7"
  CACHETAG: build
  DOCKER_HOST: tcp://docker:2375

services:
- docker:dind

before_script:
- docker info
- docker version
- echo "$CI_JOB_TOKEN" | docker login -u "$CI_REGISTRY_USER" "$CI_REGISTRY" --password-stdin

test:
  stage: test
  script:
  - cat /etc/hosts
  - env|sort
  - docker build -t ${CI_REGISTRY_IMAGE}:${VERSION} .
  - docker images
  only:
  - debug

build:
  stage: build
  script:
  - if [ -f init ]; then chmod 500 init; fi
  - docker pull ${CI_REGISTRY_IMAGE}:${CACHETAG} || true
  - 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}
  tags:
  - docker
  only:
  - c7