Re: Loading modules on demand with /sbin/hotplug

[DervishD <udev@dervishd.net>]

    Hi Kay :)

    Thanks for your fast answer :)

 * Kay Sievers <kay.sievers@vrfy.org> dixit:
> On 2/27/07, DervishD <udev@dervishd.net> wrote:
> >    Right now I'm using "udevinfo -q name -p $ENV{DEVPATH}", which
> >correctly tells me the /dev entry I need to handle, and this works (I
> >mean, I'm able to create/remove mountpoints and load/unload modules) for
> >an USB pendrive I have at hand to make tests, but I'm not sure if this
> >is a good general method, given that I will have USB removable hard
> >discs, a camera (PTP protocol, not usb-storage), a Palm PDA, etc...
> >Also, I want to do this too for audio (the system has two cards and they
> >will be used by name), etc. If my method is enough, just tell and I'll
> >shut up ;)
> 
> All events that created a device-node, contain DEVNAME in the environment.

    OK, that's a GOOD starting point :)) I thought that DEVNAME was
dependent on some obscure driver internal, that some drivers exported a
DEVNAME and other didn't.

> If you find MODALIAS in the environment, just run /sbin/modprobe with
> a RUN rule and almost all needed modules should get auto-loaded. There
> are only a few exceptions for exotic subsystems.

    You're reading my mind ;)) My next question was going to be if
instead of using my program for that, I could use just a RUN rule. Right
now my script does exactly that: if a MODALIAS is present, it loads the
module. Otherwise, it looks into its config file to see if any action
must be performed for the device node (creating mount points, load
modules, whatever). My rules file to do that is:

RUN+="/usr/sbin/hal"

    My "hal" script does all the work, but thanks to your kind advice,
I'll add this rule:

$ENV{MODALIAS}="?*" RUN+="modprobe $env{MODALIAS}"

    Anything wrong with this rule?

    Thanks a lot, Kay :)

    Raúl Núñez de Arenas Coronado

-- 
Linux Registered User 88736 | http://www.dervishd.net
It's my PC and I'll cry if I want to... RAmen!

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