On Thu, 28 Oct 2021 05:28:27 -0700 (PDT) Suresh Karpurapu <[email protected]> wrote:
> # grep AllowGroups /etc/ssh/sshd_config
> AllowGroups x y z
>
> # grep AllowGroups /etc/ssh/sshd_config
> AllowGroups x y z a <-----group "a" needs to be added at
> the end of the line
Enable *backrefs* and create non-greedy capture group in front of the
potentially existent "a" group
- lineinfile:
path: /etc/ssh/sshd_config
backrefs: true
regexp: '^\s*AllowGroups\s+(.*?)(\s+a)*$'
line: 'AllowGroups \1 a'
The task is idempotent. Quoting from *regexp*
https://docs.ansible.com/ansible/latest/collections/ansible/builtin/lineinfile_module.html#parameter-regexp
"When modifying a line the regexp should typically match both the
initial state of the line as well as its state after replacement by
line to ensure idempotence."
--
Vladimir Botka
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