myos/ansible/roles/hosts/handlers/main.yml

---
# file: handlers/main.yml

- name: update boot - syslinux
  become: yes
  environment:
    PATH: "{{ ansible_env.PATH }}:/usr/sbin:/sbin"
  with_together:
  - '{{ boot_config }}'
  - '{{ boot_config_handler_notify.results }}'
  command: "update-extlinux"
  when: item.1.changed and item.0.dest == "/etc/update-extlinux.conf"

- name: update boot - grub
  become: yes
  environment:
    PATH: "{{ ansible_env.PATH }}:/usr/sbin:/sbin"
  with_together:
  - '{{ boot_config }}'
  - '{{ boot_config_handler_notify.results }}'
  command: "update-grub"
  when: item.1.changed and item.0.dest == "/etc/default/grub"