---

- name: Get Old Hostname
  shell: hostname
  register: old_hostname

- name: set prop_hostname
  set_fact:
    prop_hostname: "{{ new_hostname }}"

- name: Add domain
  set_fact:
    prop_hostname: "{{ new_hostname }}.home.cosmos"
  when: add_domain | bool

- name: Display hostname info
  debug:
    msg: 
      - "Old hostname was {{ old_hostname.stdout_lines[0] }}"
      - "New hostname will be {{ prop_hostname }}"
      
- name: Rename Endpoint
  hostname:
    name: "{{ prop_hostname }}"

- name: Add FQDN to hosts file
  lineinfile:
    path: /etc/hosts
    regexp: '{{ old_hostname.stdout_lines[0] }}'
    line: '127.0.0.1       {{ prop_hostname }}'


...