ansible-role-docker/tasks/setup-Debian.yml

---
- name: Ensure custom facts directory is present
  file:
    path: /etc/ansible/facts.d/
    state: directory

- name: Ensure custom fact is present
  copy:
    src: files/debian_docker_version.fact
    dest: /etc/ansible/facts.d
    owner: root
    group: root
    mode: '0755'

- name: reload facts
  setup: filter=ansible_local

- name: Ensure old versions of Docker are not installed.
  package:
    name:
      - docker
      - docker-engine
    state: absent

- name: Ensure dependencies are installed.
  apt:
    name:
      - apt-transport-https
      - ca-certificates
      - gnupg2
    state: present

- name: Add Docker apt key.
  apt_key:
    url: https://download.docker.com/linux/debian/gpg
    id: 9DC858229FC7DD38854AE2D88D81803C0EBFCD88
    state: present
  register: add_repository_key
  ignore_errors: "{{ docker_apt_ignore_key_error }}"

- name: Ensure curl is present (on older systems without SNI).
  package: name=curl state=present
  when: add_repository_key is failed

- name: Add Docker apt key (alternative for older systems without SNI).
  shell: |
    set -o pipefail
    curl -sSL https://download.docker.com/linux/debian/gpg | sudo apt-key add -
  args:
    warn: false
  when: add_repository_key is failed

- name: Add Docker repository.
  apt_repository:
    repo: "{{ docker_apt_repository }}"
    state: present
    update_cache: true