[sane-devel] libsane udev rule

[m. allan noah]

If you only have one scanner, you don't need to name the device.
Where do you see those libusb error messages?

allan

On Tue, Jun 10, 2014 at 4:57 PM, gobo <gobo770 at gmail.com> wrote:
> thanks for the reply.
>
> changed my approach and used scanimage -f "%d" to capture the device
> in my script.  this works well enough since i have only one scanner.
>
> is there a way to suppress the
>
> libusb couldn't open USB device /dev/bus/usb/001/001: Permission denied.
> libusb requires write access to USB device nodes.
>
> messages libusb puts out?  not a problem, just an annoyance.
>
>
> thanks.
>
>
> On 6/9/14, Olaf Meeuwissen <olaf.meeuwissen at avasys.jp> wrote:
>> 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
>>
>
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