Fix the subuid & subgid user detection and addition.

[romainsc]

Hi,

The subgid and subuid check part was not working on my setup (a vanilla RHEL 8 server).

I found a different way to check line presence and after some tests it works.

Perhaps this way will improve further usage.

[romainsc]

Hi @ikke-t ,

I found this solution in multiple Stackoverflow pages, ie:

• https://stackoverflow.com/a/30788277
• https://stackoverflow.com/a/62609075

But your remark triggered additional research in order to have a solution that is fully officially documented, and I found that the find module would do the job in a cleaner way.

Do you prefer I request another pull with an implementation based on this?

Best Regards,

[ikke-t]

That was really good find (happy to include the pun)! Looks cleaner and made for the purpose. Please do, test and rebase dropping the earlier trials.

[romainsc]

Hi @ikke-t , job done.