pi-ansible/roles/os_config/tasks/reboot.yml

# vim: ft=yaml.ansible
---
- name: Check if a reboot is needed
  ansible.builtin.stat:
    path: /var/run/reboot-required
  register: needs_reboot

- name: Include docker_services role for service shutdown
  ansible.builtin.include_role:
    name: docker_services
    tasks_from: services.yml
    apply:
      ignore_errors: true
  vars:
    stop: true
  when: needs_reboot.stat.exists or
        (force_reboot is defined and force_reboot)

- name: Reboot host
  ansible.builtin.reboot:
  when: needs_reboot.stat.exists or
        (force_reboot is defined and force_reboot)
  register: rebooted

- name: End play if reboot is not needed
  ansible.builtin.meta: end_play
  when: reboot is defined and reboot and
        (rebooted.rebooted is undefined or not rebooted.rebooted)

- name: Re-gather facts
  ansible.builtin.setup:
    filter:
      - ansible_mounts
      - ansible_swaptotal_mb
  when: rebooted.rebooted is defined and rebooted.rebooted