.gitlab-ci.yml

image: docker:stable

services:
  - docker:dind

variables:
  DOCKER_DRIVER: overlay2

stages:
  - deploy


deploy_to_docker_hub:
  stage: deploy
  when: manual
  only:
    # We only want master branch AND when tag looks like 'vX.Y.Z', however GitLab doesn't support conjunctive conditions yet:
    #   https://gitlab.com/gitlab-org/gitlab-ce/issues/27818
    # refs:
    #   - master  # Yeah, that doesn't work... The job for a commit with a tag and on a master branch is not being created.
    #
    # However we can mark tags 'v*.*.*' as protected, which also allows us to (somewhat) safely use Private-Token as protected
    # CI variable.
    variables:
      - $CI_COMMIT_TAG =~ /^v[0-9]+[.][0-9]+[.][0-9]+$/
  script:
    - apk add --no-cache git
    # check that we are deploying the latest version:
    - export LAST_KNOWN_VERSION=`git tag -l --sort=-version:refname "v*.*.*" | head -n 1 | tr -d '[:space:]'`
    - '[ "$LAST_KNOWN_VERSION" == "$CI_COMMIT_TAG" ] || (echo "Tag does not denote latest known version (which is $LAST_KNOWN_VERSION), aborting!" && exit 1)'
    - echo "Deploying..."
    - docker login -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD $CI_REGISTRY
    - docker build -t "$CI_REGISTRY_IMAGE:$CI_COMMIT_TAG" -t "$CI_REGISTRY_IMAGE:latest" --build-arg VERSION=$CI_COMMIT_TAG --build-arg VCS_REF=$CI_COMMIT_SHA --build-arg BUILD_DATE=$(date -u +'%Y-%m-%dT%H:%M:%SZ') .
    - docker push "$CI_REGISTRY_IMAGE:$CI_COMMIT_TAG"
    - docker push "$CI_REGISTRY_IMAGE:latest"
    - docker rmi grafolean/grafolean-ping-bot:$CI_COMMIT_TAG
    - docker rmi grafolean/grafolean-ping-bot:latest