[Rear-users] Recent udev changes (devtmpfs and modalias)

Schlomo Schapiro schlomo at schapiro.org
Fri Jan 27 14:19:12 CET 2012


oh yes, fun with udev :-)

If you could ask the udev developers what they recommend that would be
great. IIRC the lowest distro where we support udev is SLES9, but not sure
any more.

BTW, if we find another - more portable - way to autoload all modules that
match the existing hardware, I would be happy to hear!

In any case, we should remember to revalidate such a change.


On 27 January 2012 14:00, Jeroen Hoekx <jeroen.hoekx at hamok.be> wrote:

> Hello,
> Udev 175 needs devtmpfs on /dev. I have a patch ready to fix that.
> I also receive warnings about "SYSFS{modalias}" in 00-rear.rules.
> That originates in build/GNU/Linux/60_verify_and_adjust_udev.sh:
> if ...
>    echo 'ENV{MODALIAS}=="?*", RUN+="/bin/modprobe -bv $env{MODALIAS}"'
> else
>    echo 'ACTION=="add", SYSFS{modalias}=="?*", RUN+="/bin/modprobe -v
> $sysfs{modalias}"'
> We are checking the existence of a modalias attribute to decide which
> rule we use. Nice and clean. Unfortunately, udev 167 dropped the
> modalias attribute from its output, so we're now taking the second
> branch, which does not work at all. The first rule works just fine,
> because modalias was only dropped in the udevadm info, not for rule
> matching.
> http://git.kernel.org/?p=linux/hotplug/udev.git;a=commitdiff;h=20bee04c19e49a0cef3bd7dfec9028270c46172b
> I could and will ask the udev people to add modalias back, but we
> can't be sure that no distribution shipped a broken udev version.
> So the easiest way forward is to do a version check. Starting from
> version 80, our first rule is the recommended way.
> Any objections or remarks, since this is quite critical for Rear to
> work on older distributions?
> Jeroen
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