Is it safe to edit /etc/sudoers with the Ansible "lineinfile" module?

Question

I want to change sudo session timeout according to this answer. I can edit ordinary file:

lineinfile:
  path: /etc/sudoers
  regexp: ^Defaults  env_reset
  line: Defaults  env_reset,timestamp_timeout=60

But in first line of my /etc/sudoers written: # This file MUST be edited with the 'visudo' command as root. How to deal with it?
P.S.
Despite the fact that the short answer is yes, one must read Konstantin Suvorov answer about right way to do it with lineinfile and very interesting techraf answer about possible pitfalls on this way

Answer 1

There's a safenet option for such cases: validate.

The validation command to run before copying into place. The path to the file to validate is passed in via '%s' which must be present as in the example below. The command is passed securely so shell features like expansion and pipes won't work.

If you look at the examples section of lineinfile module, you'll see exactly what you need:

# Validate the sudoers file before saving
- lineinfile:
    path: /etc/sudoers
    state: present
    regexp: '^%ADMIN ALL='
    line: '%ADMIN ALL=(ALL) NOPASSWD: ALL'
    validate: '/usr/sbin/visudo -cf %s'