---

# This snippet determines if a Docker upgrade is required by checking the inventory
# variables, the available packages, and sets l_docker_upgrade to True if so.

- set_fact:
    docker_upgrade: True
  when: docker_upgrade is not defined

- name: Check if Docker is installed
  command: rpm -q docker
  args:
    warn: no
  register: pkg_check
  failed_when: pkg_check.rc > 1
  changed_when: no

- name: Get current version of Docker
  command: "{{ repoquery_installed }} --qf '%{version}' docker"
  register: curr_docker_version
  retries: 4
  until: curr_docker_version is succeeded
  changed_when: false

- name: Get latest available version of Docker
  command: >
    {{ repoquery_cmd }} --qf '%{version}' "docker"
  register: avail_docker_version
  retries: 4
  until: avail_docker_version is succeeded
  # Don't expect docker rpm to be available on hosts that don't already have it installed:
  when:
    - pkg_check.rc == 0
  failed_when: false
  changed_when: false

- name: Required docker version not available
  fail:
    msg: "This playbook requires access to Docker {{ l_required_docker_version }} or later"
  # Disable the 1.12 requirement if the user set a specific Docker version
  when:
    - docker_version is not defined
    - docker_upgrade | bool
    - pkg_check.rc == 0
    - avail_docker_version.stdout == "" or avail_docker_version.stdout is version(l_required_docker_version,'<')

# Default l_docker_upgrade to False, we'll set to True if an upgrade is required:
- set_fact:
    l_docker_upgrade: False

# Make sure a docker_version is set if none was requested:
- set_fact:
    docker_version: "{{ avail_docker_version.stdout }}"
  when:
    - pkg_check.rc == 0
    - docker_version is not defined

- name: Flag for Docker upgrade if necessary
  set_fact:
    l_docker_upgrade: True
  when:
    - pkg_check.rc == 0
    - curr_docker_version.stdout is version(docker_version,'<')