[sane-devel] XSANE fails to detect any scanner.

[Aveek Basu]

Hi All,

I did some more investigation and here are the details in short:

*1. libusb version 0.1-4 is not installed:*

It has been observed in Ubuntu 17.10 (x86) / (x64) & Ubuntu 18.04 that libusb
version 0.1-4  is not installed properly. Lexmark Scanner drivers
require libusb
version 0.1-4 for the scanners to get detected.

This seems to be a Ubuntu issue and nothing specific to any application.

*Bug logged:* https://bugs.launchpad.net/ubuntu/+source/xsane/+bug/1770653.

*2.* *XSANE looking for driver files in different paths:*

Usually XSANE used to look for the driver files in  /usr/lib/sane for 32
bit version of the Ubuntu OS and /usr/lib64/sane for the 64 bit version of
the Ubuntu OS. This was the case at-least till Ubuntu 14.10. After that
there seems to be discrepancies in the locations XSANE is trying to find
the driver files. Details mentioned below:

OS
OS locations searched by XSANE for the Driver Files
Ubuntu 14.10 Ubuntu 16.04 Ubuntu 16.10 Ubuntu 17.10/18.04
x86 /usr/lib/sane /usr/lib/sane /usr/lib/sane /usr/lib/i386-linux-gnu/sane
x64 /usr/lib64/sane /usr/lib/sane /usr/lib/sane
/usr/lib/x86_64-linux-gnu/sane

So now the question is which should be the perfect path for XSANE to look
for the driver files. If "*/usr/lib/i386-linux-gnu/sane*" and "
*/usr/lib/x86_64-linux-gnu/sane*" are the confirmed new locations then the
driver has to change. Need a confirmation on the same.

*Bug logged: *https://bugs.launchpad.net/ubuntu/+source/xsane/+bug/1770656


Regards,
Aveek


On Tue, May 8, 2018 at 4:38 AM, Jörn-Ingo Weigert <jiweigert at gmail.com>
wrote:

>
>
> Aveek Basu <aveek.basu at lexmark.com> schrieb am Mo., 7. Mai 2018, 14:08:
>
>> Hi Olaf \ Suzuki \ Jörn,
>>
>> Thanks for all your response. Below are our observations with respect to
>> Ubuntu 16.04(x64), 16.10(x64), 17.10(x86) & 17.10(x64). Also mentioned
>> are the workarounds which make things working:
>>
>
> Hello Aveek,
> either creating a softlink, or manually copying the related
> lexmark-scanner libraries into the system-specific sane folder would do the
> trick, yes.
> However, the best way would be, if your install script would be kicked out
> and you use the package scripts for pre- and post installation as
> favourites and forced by Debian based system using .deb-packaging
> management (dpkg / apt).
>
> Doing this by a manually created install.sh is really a bad idea, if it is
> not constantly maintained.
>
> If you are forced by management to use your install-script, then I would
> recommend, that you update it with a function to find out the correct
> lib-path to install your driver. An example to do this are listed on the
> website I send before.
>
> Regarding to libusb-0.1:
> Afaik Sane has changed from libusb to libusb-1.x in Sane 1.0.27.
> Giving the workaround to parallel install the old version may help but
> could produce side effects which are not wanted.
>
>
>> What I understand from your earlier notes, there has been some changes in
>> the way how Debian based distributions arrange their libraries to add "multiarch"
>> support. So does this simply mean we need to handle it out from our scan
>> driver?
>>
> In the way to update your install script or use the regular install
> scripts as update your dependencies for libusb to use the actual version,
> yes.
>
>
> Regards,
>> Aveek
>>
>
> Kind regards,
> Jörn-Ingo Weigert
>
>
>>
>> On Sun, May 6, 2018 at 9:33 AM, Olaf Meeuwissen <
>> paddy-hack at member.fsf.org> wrote:
>>
>>> Hi Aveek, Toshiya, Oliver, list,
>>>
>>> suzuki toshiya writes:
>>>
>>> > Checking Ubuntu-16.04.04 LTS, drivers are located in
>>> > /usr/lib/x86_64-linux-gnu/sane/, not /usr/lib64, as far
>>> > as I use the binary packages by Ubuntu.
>>>
>>> Correct.  Debian based distributions have rearranged where libraries
>>> (and header files) are installed to add "multiarch" support.
>>>
>>> See https://wiki.debian.org/Multiarch for details.
>>>
>>> > So, it looks correct. I'm afraid that your system
>>> > mixes i386 binaries & amd64 binaries, or, something
>>> > built by yourself. could you post more about your
>>> > system?
>>>
>>> > Aveek Basu wrote:
>>> >> Hi
>>> >>
>>> >> This is Aveek from Lexmark - Driver Product Engineering team. It has
>>> >> recently come to our notice that XSANE fails to detect our scanners
>>>
>>> I expect the same result with *any* SANE frontend, not just XSane.
>>>
>>> >> XSANE tries to read the driver files from /usr/lib/sane whereas the
>>> >> files are present in /usr/lib64/sane. Due to this, XSANE is not able
>>> >> to detect any scanner.
>>> >>
>>> >> This issue is being observed from Ubuntu 16.04. Could you please help
>>> >> us understand if it is a bug or a change in behaviour.
>>>
>>> You should see the same in Ubuntu 14.04 and perhaps even in 12.04 as
>>> that is when the first multiarch changes started.
>>>
>>> I'm pretty sure this is a bug in your binary packages.
>>>
>>> Hope this helps,
>>> --
>>> Olaf Meeuwissen, LPIC-2            FSF Associate Member since 2004-01-27
>>>  GnuPG key: F84A2DD9/B3C0 2F47 EA19 64F4 9F13  F43E B8A4 A88A F84A 2DD9
>>>  Support Free Software                        https://my.fsf.org/donate
>>>  Join the Free Software Foundation              https://my.fsf.org/join
>>>
>>
>>
>>
>> --
>> Regards,
>> Aveek
>>
>


-- 
Regards,
Aveek
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