[sane-devel] libsane udev rule

[Olaf Meeuwissen]

gobo writes:

> generally, i know how to write udev rules.  but i'm not sure how to
> write one for libsane.
>
> scanimage -L returns something like:
> device `canon_dr:libusb:001:002' is a CANON DR-2580C scanner
>
> where the 001:002 is always changing.  :005, :008, etc.
>
> so in 55-libsane.rules there is:
> # Canon DR-2580C
> ATTR{idVendor}=="04a9", ATTR{idProduct}=="1608", MODE="0664",
> GROUP="lp", ENV{libsane_matched}="yes"
>
> what do i add to the rule to force this device to always have the same
> libusb name?

In short, you can't.

You can assign a value to the SYMLINK key in a udev rule.  That will
dutifully create a device with that name no matter what bus and device
number it has.  However, as long as the canon_dr backend (or probably
most any backend) creates device names using the bus and device numbers,
you are out of luck.

Hope this clarifies,
-- 
Olaf Meeuwissen, LPIC-2           FLOSS Engineer -- AVASYS CORPORATION
FSF Associate Member #1962               Help support software freedom
                 http://www.fsf.org/jf?referrer=1962