%e switch doesn't work for udev

%e switch doesn't work for udev

[Philippe ROUQUIER]

Hi,
(I've not suscribed to the list so if you've got an answer please reply
directly to me). 
I've read in the udev FAQ that this is the right place for talking and
asking about udev problems, if not please tell me the right place to
send my question.

here is the thing, in my /etc/udev/rules.d, I've set up something like
BUS="ide", KERNEL="hd[b-z]", SYSFS{removable}="1", NAME="%k",
SYMLINK="cdroms/cdrom%e" as it is advised in some docs. Now the problem
is it doesn't work: for example hdb (a cdrom) creates
a /dev/cdroms/cdrom symlink pointing to hdb and hdc (another cdrom
reader) also creates the same symlink later which is pointing to hdc
this time. The only way I've found to distinguish between the two cdroms
is with the %b switch but I really want to use the %e. I use udev
version 0.50 and I've got the newest hotplug package.
any idea what is going wrong?

Thanks in advance



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Re: %e switch doesn't work for udev

[Kay Sievers]

On Tue, 2005-01-04 at 08:08 +0100, Philippe ROUQUIER wrote:
> Hi,
> (I've not suscribed to the list so if you've got an answer please reply
> directly to me). 
> I've read in the udev FAQ that this is the right place for talking and
> asking about udev problems, if not please tell me the right place to
> send my question.

You are at the right place.

> here is the thing, in my /etc/udev/rules.d, I've set up something like
> BUS="ide", KERNEL="hd[b-z]", SYSFS{removable}="1", NAME="%k",
> SYMLINK="cdroms/cdrom%e" as it is advised in some docs. Now the problem
> is it doesn't work: for example hdb (a cdrom) creates
> a /dev/cdroms/cdrom symlink pointing to hdb and hdc (another cdrom
> reader) also creates the same symlink later which is pointing to hdc
> this time. The only way I've found to distinguish between the two cdroms
> is with the %b switch but I really want to use the %e. I use udev
> version 0.50 and I've got the newest hotplug package.
> any idea what is going wrong?

What does:
  udevinfo -q all -p /block/hdb
  udevinfo -q all -p /block/hdc

print?

Kay



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Re: %e switch doesn't work for udev

[Kay Sievers]

On Tue, 2005-01-04 at 20:49 +0100, Philippe wrote:
> Le mardi 04 janvier 2005 à 16:44 +0100, Kay Sievers a écrit :
> > On Tue, 2005-01-04 at 08:08 +0100, Philippe ROUQUIER wrote:
> > > Hi,
> > > (I've not suscribed to the list so if you've got an answer please reply
> > > directly to me). 
> > > I've read in the udev FAQ that this is the right place for talking and
> > > asking about udev problems, if not please tell me the right place to
> > > send my question.
> > 
> > You are at the right place.
> > 
> > > here is the thing, in my /etc/udev/rules.d, I've set up something like
> > > BUS="ide", KERNEL="hd[b-z]", SYSFS{removable}="1", NAME="%k",
> > > SYMLINK="cdroms/cdrom%e" as it is advised in some docs. Now the problem
> > > is it doesn't work: for example hdb (a cdrom) creates
> > > a /dev/cdroms/cdrom symlink pointing to hdb and hdc (another cdrom
> > > reader) also creates the same symlink later which is pointing to hdc
> > > this time. The only way I've found to distinguish between the two cdroms
> > > is with the %b switch but I really want to use the %e. I use udev
> > > version 0.50 and I've got the newest hotplug package.
> > > any idea what is going wrong?
> > 
> > What does:
> >   udevinfo -q all -p /block/hdb
> >   udevinfo -q all -p /block/hdc
> > 
> > print?

> I tried what you asked. and I always got the same message 'device not
> found in the database' I tried to modify the above lines and nothing
> came out of it always the same problem.

That's what I expected.

> by the way after -p what are we supposed to give the sysfs path
> ( /sys/block/hdc/dev) or just what you wrote which would correspond to a
> device in the database located in /dev/udev.db/ on my computer, that
> wasn't clear for what I got from my search on internet).

"man udevinfo" should print it.

The -p is the kernels sysfs path to the device udev created the node
for. udevinfo looks in its database for the name of the node.

How does ls -l /dev/udev.db look like? Is it a file or a directory?
We've changed from a single file to a directory recently and if your
initscript doesn't remove the old database before it runs udevstart and
you don't use tmpfs for /dev the old file may prevent the creation of
the directory.
Just remove /dev/udev.db completely and run /sbin/udevstart to create a
new one then udevinfo should print something.

Kay



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