/dev/hdc file permissions Questions

[Paul Howarth]

On Wed, 2005-03-09 at 16:07 +0900, Mark Sargent wrote:
> Mark Sargent wrote:
> 
> > Hi All,
> >
> > sometimes I load a scsi cd-rw at boot. It's always loaded as /dev/hdc. 
> > I have a coupla Qs about permissions etc. When it's loaded each time, 
> > does the file /dev/hdc permissions get altered each time.? I ask this, 
> > because, 2 dys ago, I changed the permissions of the file to 666, so 
> > as to allow K3b to burn in root mode. This is because the burn process 
> > stops mid burn with a 254 error stating cdrecord is not being run with 
> > root priviliges. But, the permissions are back as 600 today. I would 
> > have thought the file's permissions stay changed despite the loading 
> > or not of a block device to that file.? Am I wrong..?
> >
> Hi All,
> 
> just to delve into this a little more; what are the default udev 
> permissions/ownership for /dev/hdc /dev/scd0.? I get the following,
> 
> [root at localhost dev]# ls -alh hdc scd0
> brw-------  1 coolboarderguy disk 22, 0 Mar  9  2005 hdc
> brw-------  1 coolboarderguy disk 11, 0 Mar  9  2005 scd0
> 
> Shouldn't they be owned by root..? If no, then I get problems with 
> cdrecorder/K3b. Burning stops mid-burn and gives the 254 error saying 
> that cdrecorder is not with root priviliges. Little confused. Cheers.

You'll find there's a symlink created by udev:

/dev/cdwriter -> hdc

The device pointed to by this symlink will be owned by the currently-
logged-in user, so that they can access the device.

See /etc/security/console.perms

The idea is to support cd burning as a non-root user, but it appears
that this isn't working...

Paul.
-- 
Paul Howarth <paul at city-fan.org>