---

  - 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: Make sure the extra repos is enabled
    command: subscription-manager repos --enable rhel-7-server-extras-rpms
    when: "ansible_os_family == 'RedHat'"
    tags: rpm

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

  - name: Start docker
    service: name=docker state=started
    tags: docker-storage

 # TODO : on fresh install, run docker-storage-setup inconditionally


  - name: Determine if docker storage driver == devicemapper
    shell: docker info | grep 'Storage Driver:.*devicemapper'
    register: correct_storage_driver
    changed_when: false
    ignore_errors: yes

  - debug:
      var: correct_storage_driver

  - name: set docker_storage_setup_needs_to_run
    set_fact:
      docker_storage_setup_needs_to_run: '{{ correct_storage_driver.rc == 1 }}'
    tags: docker-storage

  - 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