config.yml

# This is a continuous build CircleCI configuration for a Docker container
# intended to bulid on CircleCI to spread out testing over Travis/Circle.
# The container is built and pushed to the CONTAINER_NAME variable
# defined here or within the CircleCI settings. The following environment
# variables are acceptable here or in these settings (for sensitive information)
#
# CONTAINER_NAME
# DOCKER_USER
# DOCKER_EMAIL

################################################################################
# Functions
################################################################################

# Defaults

defaults: &defaults
  docker:
    - image: docker:18.01.0-ce-git
  working_directory: /tmp/src
  environment:
    - CONTAINER_NAME: singularityware/docker2singularity

# Installation

install: &install
    name: Install parallel gzip, gettext, python3, and jq
    command: apk add --no-cache pigz python3 gettext jq


dockerload: &dockerload
    name: Load Docker container Image
    no_output_timeout: 30m
    command: | 
      echo "Working directory is ${PWD}"
      docker info
      set +o pipefail
      if [ -f /tmp/cache/container.tar.gz ]; then
          apk update && apk add --no-cache pigz curl curl-dev
          pigz -d --stdout /tmp/cache/container.tar.gz | docker load
      fi
      

dockersave: &dockersave
    name: Docker Save
    no_output_timeout: 40m
    command: |
      DOCKER_TAG="v$(cat VERSION)"
      echo "Saving ${CONTAINER_NAME}:${DOCKER_TAG} to container.tar.gz"
      mkdir -p /tmp/cache
      docker save ${CONTAINER_NAME}:${DOCKER_TAG} \
        | pigz -2 -p 3 > /tmp/cache/container.tar.gz


dockerdeploy: &dockerdeploy
    name: Deploy to Docker Hub
    no_output_timeout: 40m
    command: |
      docker images
      DOCKER_TAG="v$(cat VERSION)"
      echo "Container name set to ${CONTAINER_NAME}:${DOCKER_TAG}"
      if [[ -n "$DOCKER_PASS" ]]; then
            docker login -u $DOCKER_USER -p $DOCKER_PASS
            docker push ${CONTAINER_NAME}:${DOCKER_TAG}
            echo "Tagging latest image..."
            docker tag ${CONTAINER_NAME}:${DOCKER_TAG} ${CONTAINER_NAME}:latest
            docker push ${CONTAINER_NAME}:latest
      fi

dockerbuild: &dockerbuild
    name: Build development Docker container
    command: |
      echo "Building base image..."
      DOCKER_TAG="v$(cat VERSION)"
      docker build -t ${CONTAINER_NAME}:${DOCKER_TAG} .

test: &test
    name: Test using docker2singularity
    command: |
      echo "Testing docker2singularity entrypoint"
      DOCKER_TAG="v$(cat VERSION)"
      echo "1. Testing run without arguments..."
      echo "docker run ${CONTAINER_NAME}:${DOCKER_TAG}"
      docker run "${CONTAINER_NAME}:${DOCKER_TAG}"
      echo "Return value $?"

################################################################################
# Jobs
################################################################################


version: 2
jobs:
  build:
    <<: *defaults
    steps:
      - checkout
      - restore_cache:
          keys:
            - docker-v1-{{ .Branch }}
          paths:
            - /tmp/cache/container.tar.gz
      - restore_cache:
          key: dependency-cache
      - setup_remote_docker
      - run: *install
      - run: *dockerload
      - run: *dockerbuild
      - run: *test
      - run: *dockersave
      - persist_to_workspace:
            root: /tmp
            paths:
                - src
                - cache

  update_cache:
    <<: *defaults
    steps:
      - attach_workspace:
          at: /tmp
      - save_cache:
         key: docker-v1-{{ .Branch }}
         paths:
            - /tmp/cache/container.tar.gz

  deploy:
    <<: *defaults
    steps:
      - attach_workspace:
          at: /tmp
      - setup_remote_docker
      - run: *dockerload
      - run: *dockerdeploy


################################################################################
# Workflows
################################################################################


workflows:
  version: 2
  build_test_deploy:
    jobs:
      - build:
          filters:
            branches:
              ignore: 
                - gh-pages
                - /docs?/.*/
            tags:
              only: /.*/

      - update_cache:
          requires:
            - build
          filters:
            branches:
              ignore: 
                - gh-pages
                - /docs?/.*/
            tags:
              only: /.*/

      # Upload the container to Docker Hub
      - deploy:
          requires:
            - build
            - update_cache
          filters:
            branches:
              only: master
            tags:
              only: /.*/