Re: scsi-devfs.sh

[Kay Sievers <kay.sievers@vrfy.org>]

On Thu, Jan 08, 2004 at 11:51:48AM +0100, Remco wrote:
> Op donderdag 08 januari 2004 11:30, schreef Kay Sievers:
> > On Thu, Jan 08, 2004 at 08:35:58AM +0100, Remco wrote:
> > > Analogous to the 'ide-devfs.sh' script, I created a 'scsi-devfs.sh'
> > > CALLOUT script. I tried to make it useful for any SCSI device. (using
> > > names taken from the Linux SCSCI 2.4 howto, so if there were any major
> > > changes in 2.6 they are not reflected in the script) Since I only own one
> > > external USB drive that's all I could test it with, so other devices have
> > > not been tested.
> > >
> > > scsi-devfs.sh:
> > >
> > > #!/bin/sh
> > >
> > > # udev CALLOUT script
> > > # return devfs-like-names for scsi-devices
> > > # CALLOUT, BUS="scsi", PROGRAM="/etc/udev/scsi-devfs.sh %k %b %n",
> > > ID="[nst*]", NAME="%1c", SYMLINK="%2c" # CALLOUT, BUS="scsi",
> > > PROGRAM="/etc/udev/scsi-devfs.sh %k %b %n", ID="[scd*]", NAME="%1c",
> > > SYMLINK="%2c" # CALLOUT, BUS="scsi", PROGRAM="/etc/udev/scsi-devfs.sh %k
> > > %b %n", ID="s[dgrt]*", NAME="%1c", SYMLINK="%2c"
> >
> > What does a character class with a asterisk ID="[nst*]" mean?
> > Shouldn't it be  ID="nst*"? Same for ID="scd*".
> 
> I don't know how I came up with those brackets but you're absolutely right !
> Correct me if I'm wrong but any rule like "ID=[???*]" would mean ID-ing every 
> device in the system and this seems pretty senseless in general.
> 

Everything inside the brackets are a character class.
A character class may contain a list of characters that should match or
a range like [0-9] or [a-z]. But everything inside is only compared with
one single char of the string.

udev's matching is partly based on fnmatch():
http://developer.novell.com/ndk/doc/libc/index.html?page=/ndk/doc/libc/libc_enu/data/amsgxku.html

You may also use only one rule in udev.rules.
Just use ID="*" and exit with nonzero in the script when no device is
matching your processing. The rule is only applied when the callout
returns successful.

thanks,
Kay



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