- 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' }}"
  block:
    - include_tasks: "{{ lookup('first_found', params) }}"
      vars:
        params:
          - '{{ ansible_distribution }}.yml'
          - '{{ ansible_os_family }}.yml'
      when: not is_rhel6

    - name: Install Python requirements
      vars:
        extra_packages: "{{ '' if not is_rhel7 else ',requests==2.6.0' }}"
      pip:
        state: present
        name: 'docker{{ extra_packages }}'
        extra_args: "-c {{ role_path }}/../../../runner/requirements/constraints.txt"

    # Detect docker API and docker-py versions
    - 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_api_version: "{{ docker_api_version_stdout.stdout or '0.0' }}"
        docker_py_version: "{{ docker_py_version_stdout.stdout or '0.0' }}"

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