mount boot: false doesn't work on Linux, NetBSD and OpenBSD systems

[copyrights]

SUMMARY

If boot option of mount module is set to false it shall add noauto mount option on Linux, NetBSD and OpenBSD systems.
But there are exceptions. E.g. if defaults in opts

ansible.posix/plugins/modules/mount.py

Line 746 in 2d3f55c

if 'defaults' in opts:

But this is always the case if opts is not set or not on Solaris.

ansible.posix/plugins/modules/mount.py

Line 707 in 2d3f55c

opts='defaults',

Side note: Documentation is misleading as it says opts has no default value. In fact the default value is either "default" or "-".

ISSUE TYPE

• Bug Report

COMPONENT NAME

• ansible.posix.mount

ANSIBLE VERSION

ansible [core 2.12.5]
  config file = /etc/ansible/ansible.cfg
  configured module search path = ['/home/copyrights/.ansible/plugins/modules', '/usr/share/ansible/plugins/modules']
  ansible python module location = /usr/lib/python3.10/site-packages/ansible
  ansible collection location = /home/copyrights/.ansible/collections:/usr/share/ansible/collections
  executable location = /usr/bin/ansible
  python version = 3.10.4 (main, Mar 23 2022, 23:05:40) [GCC 11.2.0]
  jinja version = 3.0.3
  libyaml = True

COLLECTION VERSION

# /usr/lib/python3.10/site-packages/ansible_collections
Collection    Version
------------- -------
ansible.posix 1.3.0  

CONFIGURATION

OS / ENVIRONMENT

no relevant

STEPS TO REPRODUCE

---
- name: Mount
  hosts: all
  tasks:
    - name: mount device
      ansible.posix.mount:
        path: /srv/disk
        src: /dev/sdb1
        fstype: ext4
        state: mounted
        boot: false

EXPECTED RESULTS

Device is mounted, but will not be mounted on next boot.

ACTUAL RESULTS

Device is mounted and will be mounted on next boot

[copyrights]

I guess the reason for the exception on defaults is that defaults includes auto. from mount(8):

       defaults
           Use the default options: rw, suid, dev, exec, auto, nouser, and async.

           Note that the real set of all default mount options depends on the kernel and filesystem type. See the beginning of this section for more details.