---

  - name: Check for mandatory variables required by this playbook
    fail:
      msg: "This playbook requires {{item}} to be set."
    when: "item is not defined or item == ''"
    with_items:
    - docker_storage_vg
    tags: docker-storage

  - name: Install Docker
    yum: name=docker state=installed
    tags: rpm

  - name: Start docker
    service: name=docker state=started
    tags: docker-storage
    when: 'docker_storage_setup_needs_to_run is not defined'

  - name: Determine if docker storage driver == devicemapper
    shell: docker info
    register: docker_info
    changed_when: false
    when: 'docker_storage_setup_needs_to_run is not defined'

  - name: set docker_storage_setup_needs_to_run
    set_fact:
      docker_storage_setup_needs_to_run: '{{ docker_info.stdout.find(''Storage Driver: devicemapper'') == -1 or docker_info.stdout.find(''Data file: /dev/loop'') != -1 }}'
    when: 'docker_storage_setup_needs_to_run is not defined'
    tags: docker-storage

  - name: Cleanup the existing docker-storage state
    file: state=absent path=/etc/sysconfig/docker-storage
    when: docker_storage_setup_needs_to_run

  - name: stop docker
    service:
      name: docker
      state: stopped
    when: docker_storage_setup_needs_to_run
    tags: docker-storage

  - name: delete /var/lib/docker
    command: rm -rf /var/lib/docker
    when: docker_storage_setup_needs_to_run
    tags: docker-storage

  - name: Configure docker-storage-setup to use LVM
    template: dest=/etc/sysconfig/docker-storage-setup src=docker-storage-setup
    register: docker-storage-setup
    when: docker_storage_setup_needs_to_run
    tags: docker-storage

  - name: Run docker-storage-setup
    command: docker-storage-setup
    environment:
      PATH: /bin:/usr/bin:/sbin:/usr/sbin # Fix buggy PATH on RHEL7
    when: docker_storage_setup_needs_to_run
    tags: docker-storage

  - name: Start Docker
    service: name=docker state=started enabled=yes
    tags: docker-storage