- hosts: all
  tasks:
    - name: Verify if system is Debian
      debug:
        msg: "This playbook is running on a Debian system."
      when: ansible_os_family == "Debian"

    - name: Stop playbook if system is not Debian
      fail:
        msg: "This playbook only supports Debian."
      when: ansible_os_family != "Debian"

    - name: Include OS update role
      include_role:
        name: os-updates
      when: ansible_os_family == "Debian"