---
- name: set kernel command line options
  lineinfile:
    path: /etc/default/grub
    regexp: '^#?GRUB_CMDLINE_LINUX='
    line: 'GRUB_CMDLINE_LINUX="{{ (install.kernel_cmdline or []).join(" ") }}"'
  when: install is defined and install.kernel_cmdline is defined
  notify: update grub