---
- name: hostname | Add entries to /etc/hosts
  when: explicitly_set_hostname
  tags: [systemsetup, hostname]
  block:
    - name: hostname | Set the hostname when different from the inventory one.
      ansible.builtin.hostname:
        name: "{{ hostname }}"
      when: hostname is defined

    - name: hostname | Set the hostname as defined in the inventory
      ansible.builtin.hostname:
        name: "{{ inventory_hostname }}"
      when: hostname is not defined

    - name: hostname | Add the hostname into the /etc/hosts file
      ansible.builtin.blockinfile:
        path: /etc/hosts
        marker_begin: ansible_hostname_start
        marker_end: ansible_hostname_end
        marker: "# {mark} hostname entry managed by ansible"
        block: "{{ ansible_default_ipv4.address }} {{ hostname }} {{ ansible_hostname }}"
        state: present