ansible/utils/reboot_needed_check.yml

#!/usr/bin/env ansible-playbook
---
# Check if a reboot is required by the installation of some packages (ie kernel)
- hosts: localhost
  tasks:
    - name: Make sure local file exist but is empty  # weird hack, I know
      copy:
        dest: /tmp/ansible_dump_reboot_needed.txt
        content: ""
        force: true
        mode: 0644

- hosts: all,!unifi,!escalope.adm.auro.re,!loki.adm.auro.re,!viviane.adm.auro.re,!vpn-ovh.adm.auro.re
  tasks:
    # Register the output of the file /var/run/reboot-required.pkgs
    - name: Register if boot is required
      shell: if [ -e /var/run/reboot-required.pkgs ]; then cat /var/run/reboot-required.pkgs; fi
      register: result

    - name: DEBUG
      debug:
        msg: "{{ ansible_facts['nodename'] }} : {{ result.stdout }}"
      when: result.stdout is defined

    # Add info line by line
    - name: Dump all info into the local file
      delegate_to: localhost
      lineinfile:
        path: /tmp/ansible_dump_reboot_needed.txt
        line: "{{ ansible_facts['nodename'] }} : {{ result.stdout }}"
      when: result.stdout is defined