udev configuration issuses

_loki_ · l33t Joined: 18 Dec 2003 Posts: 680 Location: in the shell

Hallo, yesterday night I spended some hours on udev..- this post should be both, a collection of things I think I have understand know and also some questions about things I still don't understand at all. My problem was that I didn't had writte access as user on /dev/hdc, which is my cdwriter. I founf a lot of posts reagrding this issuses..- but after a time I got the feeling that most of them are outdated by now; In the ending I was able to solve my problem, but actually not in a way I wanted in the first place.. After some time I realized that my problem wasn't about permissions (udev generally sets them as 660), but more about the group the device belongs to. When I read the right articles all these things are configurated within:

Gentree · Posted: Fri Apr 15, 2005 6:49 pm Post subject:

I had pam screwing things nicely serveral month back. I still get my teeth grating when I type it. I shall never have a relationship with someone called Pamela !

I locked pam down to 0.77 where it did not actually do much and all was fine.

I have no idea if the issues are resolved , but it was irrelvant to my system anyway so I locked it out.

Keep us posted on udev. I am trying to set it up but I dont even get /dev/hda devices just now. devfs was a doddle.

I suspect udev is too powerful in that it needs careful tweeking and is less resistant to hardware changes.

HTH
_________________
Linux, because I'd rather own a free OS than steal one that's not worth paying for.
Gentoo because I'm a masochist
AthlonXP-M on A7N8X. Portage ~x86

Nil_Spaar · Posted: Fri Apr 15, 2005 9:59 pm Post subject:

I think adding your user to the "cdrom" group is exactly the right way to solve this. To play games you must be in the games group, to su you must be in the wheel group. To play music you must be in the audio group (at least on debian, not sure if it's necessary on gentoo). That is (part of) what groups are for.
But when I checked I found out that /dev/hdb is owned by "myuser:cdrom" and has rights 600 and so I can burn CDs without being in the cdrom group. And I never touched anything on pam or udev. I find it really strange that these things work sometimes out of the box and sometimes not at all.
I'll look into this a bit more and post when I've found something interesting.

_loki_ · l33t Joined: 18 Dec 2003 Posts: 680 Location: in the shell

I still think that the "cdrw" group woulf be the better one to allow users writing on their cd devices..- but anyways that's something users should be able to define like they want it to be using udev! That's exactly the point I don't get so fare as I think the chages I made should have changed tings like I wnated them to be, and it didn't really work..
If there is a udev guru out there how could tell me what I did wrong, I'll appreciate!

Tlaloc · Posted: Sat Apr 16, 2005 2:10 pm Post subject:

@_loki_

Are there special reasons why you are using the testing version of udev or are you completely on ~ anyway?
I am asking because I have done a 2005.0 stage 3 install recently with udev and am interested in the topic too.
I have had some problems in burning with my external firewire/usb dvd writer and am trying to figure out where they really come from. My internal cd-writer is working fine though, but I can also affirm that access rights seem to get changed somehow for my internal optical drives as they are not the ones specified in my 50-udev.permissions file (Or did I change them with the k3b setup program? Gonna check and login as another user later..).
I have also noticed that with stable sys-fs/udev-045 I am running access rights for /dev/sg0 (my external dvd writer) get set to root:disk (like they should according to 50-udev.permissions). Therefore I added users that should be allowed to burn CDs or DVDs to the disk group, since I didn't know that I could specify that in a proper way. Is this still the default behaviour for scsi cdrom devices?

Bye, Valentin.

_loki_ · l33t Joined: 18 Dec 2003 Posts: 680 Location: in the shell

My whole system run on ~, so fare quite stable, the only thing I'm still having problmes with is love-sources, and that's not even in portage (but you can gensync it if you want, it's in gentoo-de) . Anyway, I didn't tried versions older that 0.51.. Actually the versoin I'm running is 0.56. Permissions for older versions were changed in: