check_disk: Permission denied redux II

[Zendan]

I was having two separate discussions that have since been closed… so here is the continuation. As background, I was having permission issues with an unofficial plugin. However, after some troubleshooting, we suspect it's a bug in nagios itself.

Essentially, it seems that nagios strips out supplementary group IDs. That is, I run the following in the terminal to reveal all the groups of the nagios user.

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$ sudo runuser -u nagios -- /usr/bin/id
uid=30(nagios) gid=30(nagios) groups=30(nagios),1050(media)

However, when I run the command through nagios, the GUI shows me

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uid=30(nagios) gid=30(nagios) groups=30(nagios)

The secondary group is missing, hence nagios complains of permission errors when attempting to access directories owned by media.

What's odd is that even if I change the primary gid of nagios, hence in the terminal

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$ sudo runuser -u nagios -- id
uid=30(nagios) gid=1050(media) groups=1050(media),30(nagios)

Nagios's GUI still reports the gid incorrectly as the old nagios, not the new media.