- name: Get OS version
  shell: uname -r
  register: os_version

- name: Install packages for Trusty
  apt:
    name: "{{ item }}"
    state: present
    update_cache: yes
  with_items:
  - "linux-image-extra-{{ os_version.stdout }}"
  - linux-image-extra-virtual 
  when: ansible_distribution_release == 'trusty'

- name: Install pre-reqs
  apt:
    name: "{{ item }}"
    state: present
    update_cache: yes
  with_items:
  - apt-transport-https
  - ca-certificates
  - curl
  - software-properties-common

- name: Add gpg key
  shell: curl -fsSL https://download.docker.com/linux/ubuntu/gpg >key && apt-key add key

- name: Add Docker repo
  shell: add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"  

- block:
    - name: Prevent service restart
      copy:
        content: exit 101
        dest: /usr/sbin/policy-rc.d
        backup: yes
        mode: 0755
      register: policy_rc_d

    - name: Install Docker CE
      apt:
        name: docker-ce
        state: present
        update_cache: yes
  always:
    - name: Restore /usr/sbin/policy-rc.d (if needed)
      command: mv {{ policy_rc_d.backup_file }} /usr/sbin/policy-rc.d
      when:
        - "'backup_file' in policy_rc_d"

    - name: Remove /usr/sbin/policy-rc.d (if needed)
      file:
        path: /usr/sbin/policy-rc.d
        state: absent
      when:
        - "'backup_file' not in policy_rc_d"