ansible/test/integration/targets/setup_docker/tasks/main.yml

- vars:
    is_rhel: "{{ ansible_os_family == 'RedHat' and ansible_distribution != 'Fedora' }}"
    is_rhel6: "{{ is_rhel and ansible_distribution_major_version == '6' }}"
    is_rhel7: "{{ is_rhel and ansible_distribution_major_version == '7' }}"
    is_rhel8: "{{ is_rhel and ansible_distribution_major_version == '8' }}"
    is_ubuntu14: "{{ ansible_distribution == 'Ubuntu' and ansible_distribution_major_version == '14' }}"
  block:
    - include_tasks: "{{ lookup('first_found', params) }}"
      vars:
        params:
          - '{{ ansible_distribution }}.yml'
          - '{{ ansible_os_family }}.yml'
      when: not is_rhel6 and not is_rhel8
    - include_tasks: RHEL8.yml
      when: is_rhel8

    - name: Install Python requirements
      vars:
        # Inttalling requests >=2.12.0 on Ubuntu 14.04 breaks certificate validation. We restrict to an older version
        # to ensure out get_url tests work out fine. This is only an issue if pyOpenSSL is also installed.
        # Not sure why RHEL7 needs this specific version
        extra_packages: "{{ '' if not (is_rhel7 or is_ubuntu14) else ',requests==2.6.0' }}"
      pip:
        state: present
        name: 'docker{{ extra_packages }}'
        extra_args: "-c {{ remote_constraints }}"

    # Detect docker CLI, API and docker-py versions
    - name: Check Docker CLI version
      command: "docker version -f {% raw %}'{{.Client.Version}}'{% endraw %}"
      register: docker_cli_version_stdout
      ignore_errors: yes

    - name: Check Docker API version
      command: "{{ ansible_python.executable }} -c 'import docker; print(docker.from_env().version()[\"ApiVersion\"])'"
      register: docker_api_version_stdout
      ignore_errors: yes

    - name: Check docker-py API version
      command: "{{ ansible_python.executable }} -c 'import docker; print(docker.__version__)'"
      register: docker_py_version_stdout
      ignore_errors: yes

    - set_fact:
        docker_cli_version: "{{ (docker_cli_version_stdout.stdout | default('0.0')) or '0.0' }}"
        docker_api_version: "{{ docker_api_version_stdout.stdout or '0.0' }}"
        docker_py_version: "{{ docker_py_version_stdout.stdout or '0.0' }}"

    - debug:
        msg: "Docker CLI version: {{ docker_cli_version }}; Docker API version: {{ docker_api_version }}; docker-py library version: {{ docker_py_version }}"

    - block:
      # Cleanup docker daemon
      - name: "Remove all ansible-test-* docker containers"
        shell: 'docker ps --no-trunc --format {% raw %}"{{.Names}}"{% endraw %} | grep "^ansible-test-" | xargs -r docker rm -f'
        register: docker_containers
      - name: "Remove all ansible-test-* docker volumes"
        shell: 'docker volume ls --format {% raw %}"{{.Name}}"{% endraw %} | grep "^ansible-test-" | xargs -r docker volume rm -f'
        register: docker_volumes
      - name: "Remove all ansible-test-* docker networks"
        shell: 'docker network ls --no-trunc --format {% raw %}"{{.Name}}"{% endraw %} | grep "^ansible-test-" | xargs -r docker network rm'
        register: docker_networks
      - name: Cleaned docker resources
        debug:
          var: docker_resources
        vars:
          docker_resources:
            containers: "{{ docker_containers.stdout_lines }}"
            volumes: "{{ docker_volumes.stdout_lines }}"
            networks: "{{ docker_networks.stdout_lines }}"

      # List all existing docker resources
      - name: List all docker containers
        command: docker ps --no-trunc -a
        register: docker_containers
      - name: List all docker volumes
        command: docker volume ls
        register: docker_volumes
      - name: List all docker networks
        command: docker network ls --no-trunc
        register: docker_networks
      - name: List all docker images
        command: docker images --no-trunc -a
        register: docker_images
      - name: Still existing docker resources
        debug:
          var: docker_resources
        vars:
          docker_resources:
            containers: "{{ docker_containers.stdout_lines }}"
            volumes: "{{ docker_volumes.stdout_lines }}"
            networks: "{{ docker_networks.stdout_lines }}"
            images: "{{ docker_images.stdout_lines }}"

      when: docker_cli_version is version('0.0', '>')