udev.rules woes

udev.rules woes

[Guido Schimmels]

To reproduce my static /dev with udev, I tried and replaced:

BUS="ide", PROGRAM="/bin/cat /proc/ide/%k/media", RESULT="cdrom",  
NAME="%k", SYMLINK="cdrom"

with:

BUS="ide", PROGRAM="/bin/cat /proc/ide/hdc/media", RESULT="cdrom",  
NAME="hdc", SYMLINK="cdrom"

BUS="ide", PROGRAM="/bin/cat /proc/ide/hda/media", RESULT="cdrom",  
NAME="hda", SYMLINK="cdrom"

BUS="ide", PROGRAM="/bin/cat /proc/ide/hdd/media", RESULT="cdrom",  
NAME="hdd", SYMLINK="cdrom1"

BUS="ide", PROGRAM="/bin/cat /proc/ide/hdb/media", RESULT="cdrom",  
NAME="hdb", SYMLINK="cdrom1"

Looks innocent enough, but triggers completely unexpected behaviour.
It makes __all__ IDE device nodes disappear, except /dev/hdc and /dev/ 
cdrom symlinked to it.

I installed udev only yesterday.
(udev-014 (klibc build) / kernel-2.6.1 + sysfs patches)

At least this worked:

SYSFS_name="BT848*", NAME="bttv", SYMLINK="video0"
SYSFS_name="BT878*", NAME="bttv", SYMLINK="video0"
SYSFS_name="*webcam*", NAME="webcam", SYMLINK="video1"

So I don't feel completely dumb now.


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Re: udev.rules woes

[Kay Sievers]

On Fri, Jan 23, 2004 at 08:56:37PM +0200, Guido Schimmels wrote:
> 
> To reproduce my static /dev with udev, I tried and replaced:
> 
> BUS="ide", PROGRAM="/bin/cat /proc/ide/%k/media", RESULT="cdrom",  
> NAME="%k", SYMLINK="cdrom"
> 
> with:
> 
> BUS="ide", PROGRAM="/bin/cat /proc/ide/hdc/media", RESULT="cdrom",  
> NAME="hdc", SYMLINK="cdrom"
> 
> Looks innocent enough, but triggers completely unexpected behaviour.
> It makes __all__ IDE device nodes disappear, except /dev/hdc and /dev/ 
> cdrom symlinked to it.

No, it doesn't look innocent, in any kind :) You ask for _every_ ide
device "if hdc is a cdrom" and if yes please give it the name 'hdc'.
The first rule matches every time.

Why not stick with the provided example? It just works.
If you want your own rules, you may add KERNEL= to the rule.

thanks,
Kay


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