.gitlab-ci.yml

stages:
  - prep
  - build

# only- parts that only targets releases (and manual start)
.only_releases_template: &only_releases
  only:
    - /^release.+$/
    - master
    - web



create_folders:
  stage: prep
  image: python:3-alpine
  before_script:
    - apk add git
  script:
  - git diff-tree --no-commit-id --name-only -r $CI_COMMIT_SHA > files.txt
  - |
          python - << 'EOF'
          import os
          if os.getenv('ALL', 'False').lower() in ['1', 'true', 'y']:
            folders = [f for f in os.listdir('.') if os.path.isdir(f) ]
          else:
            files = open('files.txt', 'r').readlines()
            folders = [ s.strip().split('/')[0] for s in files if '/' in s]
            folders = list(set(folders))
          folders = [ s for s in folders if os.path.isfile(s+'/Dockerfile')]
          
          if len(folders)!=0:
            print('Found folders: ', folders)
            open('folders.txt', 'w').writelines( (f+'\n') for f in folders )
          else:
            print('Nothing to build')
            import sys
            sys.exit(1)
          EOF
  artifacts:
    paths: [folders.txt]
  <<: *only_releases


build:
  stage: build
  dependencies: [ create_folders ]
  image: docker
  services:
    - docker:dind
  variables:
    DOCKER_HOST: tcp://docker:2375/
    GITHUB_SHA: $CI_COMMIT_SHA
    REGISTRY: $CI_REGISTRY_IMAGE
  before_script:
    - mkdir folder-list
    - mv folders.txt folder-list/folders.txt
    - echo CI_REGISTRY_IMAGE
    - env
    - docker login -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD $CI_REGISTRY
  script:    
    - |
        echo "Will build these directories:"
        cat folder-list/folders.txt
        echo '=================='
        while read f; do 
          TAG=$REGISTRY/$f
          VER=$(date +%F)-${GITHUB_SHA::8}
          echo '==================='
          echo Folder $f,  will be tagged as $TAG:$VER
          docker build $f/ --tag $TAG:$VER --tag $TAG:latest
          docker history $TAG:$VER
          docker push $TAG:$VER
          docker push $TAG:latest  
        done < folder-list/folders.txt
  <<: *only_releases