Re: [PATCH] add options to udevtrigger to control scanning

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

On Thu, 2006-08-31 at 10:31 -0700, Greg KH wrote:
> On Thu, Aug 31, 2006 at 10:46:12AM +0200, Kay Sievers wrote:
> > On Wed, Aug 30, 2006 at 05:41:38PM -0700, Greg KH wrote:
> > > This patch has been in the gentoo tree for a bit.  It modifies
> > > udevtrigger to allow a little more fine grained control for people who
> > > don't want all of the sysfs tree to be scanned by udevtrigger at
> > > startup.
> > 
> > When is it useful to have such options?

> People do not want all of their devices probed for at boot time, they
> want to load the modules that they know they want, on their own.  So
> they don't want all of the modalias files being poked at.

> So this could be reduced to just the one option, --no-scan-bus, as that
> is all that Gentoo currently uses.  I think the original author was just
> trying to be nice in giving all possible options :)
> 
> Would you be more comfortable with just that option being added?  The
> filter seems a bit complicated, unless you are able to specify all
> modalias files.

We better avoid exposing kernel driver implementation details like
'bus', 'class', 'block', if we can. The current udev does not even have
the old BUS= key in the man page, and everything is just SUBSYSTEM(S).
That way, we are hopefully free to move things around in the kernel
without breaking too much in userspace. Also 'block' may be a 'class',
some day, and better not have its own option.

I've added these options to udevtrigger now:
  --subsystem-match=<subsystem>
  --subsystem-nomatch=<subsystem>
  --attr-match=<file[=<value>]>
  --attr-nomatch=<file[=<value>]>

If you only want to populate /dev, this should work fine:
  udevtrigger --attr-matchfiv
It will also skip all class devices which don't have a corresponding
device node.

You can also just skip all devices with a 'modalias' file:
  udevtrigger --attr-nomatch modalias
Or just skip all devices with 'modalias' for pci:
   udevtrigger --attr-nomatch modalias=pci*

By adding "--dry-run --verbose", you can check the filter on the command
line. It's in the git tree now, care to try if that works for you?

Thanks,
Kay


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