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

[Aveek Basu]

Thanks Olaf and Jorn for all the details.


Regards,
Aveek

On Sat, May 12, 2018 at 1:43 PM, Olaf Meeuwissen <paddy-hack at member.fsf.org>
wrote:

> Hi Aveek,
>
> Aveek Basu writes:
>
> > *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.
>
> In which case the debian/control file for the Lexmark Scanner driver
> should say so.  APT can then pull it in, if needed, without any effort
> required from the user when they install your driver.
>
> > This seems to be a Ubuntu issue and nothing specific to any application.
> >
> > *Bug logged:* https://bugs.launchpad.net/ubuntu/+source/xsane/+bug/
> 1770653.
>
> This is not an Ubuntu (or any other Debian distro) bug.  This is a bug
> in the Lexmark Scanner driver .deb.
>
> Please read, understand and follow the Debian[1] and Ubuntu[2] packaging
> documentation[1].
>
>  [1]: https://www.debian.org/devel/#packaging
>  [2]: http://packaging.ubuntu.com/
>
> And as Allan mentioned in another follow-up, distributions are free to
> stop providing old, deprecated libraries whenever they want to.  That
> said, libusb-0.1-4 is still available.
>
> > *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 things changed over time.  It's called progress ;-)
> Like it or not, you will have to follow these changes.
>
> > 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
>
> This is not a bug and the answer to your question is wherever they are
> supposed to be installed on each version of each distribution and each
> architecture that you target.
>
> And I fully second Allan's suggestion about open sourcing your driver.
> It will allow distribution's to do the packaging for you.  That is,
> after a bit of lead-time and hand-holding on your side, likely to lead
> to more up-to-date, better integrated packages for more versions of more
> distribution and more architectures than Lexmark could ever hope to
> support by itself.
>
> 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
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>



-- 
Regards,
Aveek
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