image: docker:latest

services:
  - docker:dind

stages:
  - Build Base
  - Build Variants
  - Push Images

variables:
  DOCKER_HOST: tcp://docker:2375/
  DOCKER_DRIVER: overlay2

build-base:
  stage: Build Base
  artifacts:
    expire_in: 1 week
    paths:
      - ./images/
  except:
    - pushes
  tags:
    - docker
  before_script:
    - mkdir ./images
  script:
    - docker build --pull --build-arg "GRAV_VERSION=$GRAV_VERSION" -t "$CI_REGISTRY_IMAGE:$CI_COMMIT_SHORT_SHA" .
    - docker save --output "./images/$CI_COMMIT_SHORT_SHA.tar" "$CI_REGISTRY_IMAGE:$CI_COMMIT_SHORT_SHA"

build-git:
  stage: Build Variants
  artifacts:
    expire_in: 1 week
    paths:
      - ./images/
  dependencies:
    - build-base
  except:
    - pushes
  tags:
    - docker
  before_script:
    - docker load --input "./images/$CI_COMMIT_SHORT_SHA.tar"
  script:
    - docker build --build-arg "CI_COMMIT_SHORT_SHA=$CI_COMMIT_SHORT_SHA" -f ./variants/Dockerfile-git -t "$CI_REGISTRY_IMAGE:$CI_COMMIT_SHORT_SHA-git" .
    - docker save --output "./images/$CI_COMMIT_SHORT_SHA-git.tar" "$CI_REGISTRY_IMAGE:$CI_COMMIT_SHORT_SHA-git"

push:
  stage: Push Images
  dependencies:
    - build-base
    - build-git
  except:
    - pushes
  tags:
    - docker
  before_script:
    - docker load --input "./images/$CI_COMMIT_SHORT_SHA.tar"
    - docker load --input "./images/$CI_COMMIT_SHORT_SHA-git.tar"
    - echo "$CI_REGISTRY_PASSWORD" | docker login -u "$CI_REGISTRY_USER" --password-stdin
  script:
    - docker tag "$CI_REGISTRY_IMAGE:$CI_COMMIT_SHORT_SHA" "$CI_REGISTRY_IMAGE:$GRAV_VERSION"
    - docker tag "$CI_REGISTRY_IMAGE:$CI_COMMIT_SHORT_SHA-git" "$CI_REGISTRY_IMAGE:$GRAV_VERSION-git"
    - docker push "$CI_REGISTRY_IMAGE:$GRAV_VERSION"
    - docker push "$CI_REGISTRY_IMAGE:$GRAV_VERSION-git"