[gdm-list] Adding a user to a group on login

I'm trying to work something out.... It's not really a gdm question, but....

I've got specific resources tied to specific X screens. So for example Display :3 gets /dev/scd1.

I'd like to set it up so that all the resources are available to a group, and the user loging in to that display is made a member of the group and then removed on logout.

So for example:

yan selene:~$ ls -l /dev/scd?
brw-rw---- 1 root   display2 11, 0 15. pro 09.03 /dev/scd0
brw-rw---- 1 root   display3 11, 1 15. pro 09.03 /dev/scd1

So if I were to log into a session with Display :3, I would be make a member of group display3, and could access that resource. On logout, I would be removed. Also, if gdm is killed, I would be removed. I really want something temporary; I don't want to muck about with /etc/group if at all possible.

Any ideas?


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