Re: udev: remove permissions file from udev

[Lindsay Haisley <fmouse-gentoo@fmp.com>]

Thus spake Kay Sievers on Mon, Dec 20, 2004 at 02:30:22PM CST
> > If it hasn't been done, I'm going to lobby once again for the inclusion in
> > udev of a utility which will will parse the sysfs tree for acceptable values
> > for KERNEL and spit out copy 'n paste lines which are acceptable in a rules
> > file, much the way udevinfo does for SYSFS{*} terms.  I corresponded with
> > Greg KH on this a while back and he suggested a simple shell script for
> > this, which I tweaked a bit and reposted.  Such as script could also show
> > acceptable values for SUBSYSTEM.  If it hasn't been done, and I get a moment
> > after the 1st of the year, I'll work on something and post it.
> 
> Hmm, I don't know if this is really useful, as sysfs has well defined
> filenames you can list that with just "ls -1 /sys/class /sys/bus", which
> will print all possible subsystems (besides block).

I figured this out, but had to go exploring in /sys to get a clue.  Even a
better doc on this would help.

> It's different from the sysfs _values_ which may be vendor defined and
> contain odd whitespaces and similar. That's why we have the udevinfo
> print.

Yeah, this is really needed for sure for SYSFS terms in a rules file, and
you're quite right about getting this information from /sys being relatively
trivial, assuming one understands something about the structure of the sysfs
file system.

> udevinfo already prints BUS= and ID= so you may add the KERNEL=,
> DRIVER=, SUBSYSTEM= keys there if you think that is useful.

It's simply a matter of convenience.  It wasn't very long ago that I started
using devfs and had to learn devfs rules files.  Now we've moved on to
udev/sysfs, and it's new tech - different data structurs, different config
files.  Being able to get everything one needs to compose working udev rules
from a single utility, without having to learn the structure of and explore
/sys, is majorly convenient.  It's just polish, but people do wax and polish
their cars ;-)

-- 
Lindsay Haisley       | "Fighting against human |     PGP public key
FMP Computer Services |    creativity is like   |      available at
512-259-1190          |    trying to eradicate  | <http://pubkeys.fmp.com>
http://www.fmp.com    |        dandelions"      |
                      |      (Pamela Jones)     |


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