---

- name: Ensure "docker" group exists
  group:
    name: "{{ docker_group }}"
    state: present

- name: Add user to docker group
  user:
    name: "{{ ansible_user }}"
    groups:
      - "{{ docker_group }}"
    append: yes

- name: Update docker daemon proxy configuration
  when: docker_userland_proxy is defined
  include_role:
    name: update-json-file
  vars:
    update_json_file_name: /etc/docker/daemon.json
    update_json_file_combine:
      userland-proxy: "{{ docker_userland_proxy }}"
    update_json_file_become: true

# Docker defaults to a MTU of 1500, which causes problems when the
# main interface has a MTU less than that.  Cloud environments often
# have this, one good example is OpenDev's Linaro ARM64 cloud.
# https://storyboard.openstack.org/#!/story/2008230
- name: Lower default MTU
  when: ansible_default_ipv4.mtu < 1500
  include_role:
    name: update-json-file
  vars:
    update_json_file_name: /etc/docker/daemon.json
    update_json_file_combine:
      mtu: 1400
    update_json_file_become: true

- name: Get the status of the docket.socket unit
  command: systemctl is-failed docker.socket  # noqa command-instead-of-module
  failed_when: false
  become: true
  register: _docker_socket_status

- name: Get the status of the docket unit
  command: systemctl is-failed docker  # noqa command-instead-of-module
  failed_when: false
  become: true
  register: _docker_status

- name: Restart docker
  when: >-
      (docker_userland_proxy is defined) or
      (ansible_default_ipv4.mtu < 1500) or
      (_docker_socket_status.stdout != 'active') or
      (_docker_socket_status.stdout != 'active')
  debug:
    msg: 'Trigger a Docker restart'
  changed_when: true
  notify: Restart docker

- name: Reset ssh connection to pick up docker group
  meta: reset_connection