- 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 }}'