GNU bug report logs - #25101
simple-scan can't use hpaio

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: ludo <at> gnu.org (Ludovic Courtès)
Cc: tracker <at> debbugs.gnu.org
Subject: bug#25101: closed (simple-scan can't use hpaio)
Date: Sat, 17 Dec 2016 22:13:02 +0000

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Your message dated Sat, 17 Dec 2016 23:12:41 +0100
with message-id <87r356qk6e.fsf <at> gnu.org>
and subject line Re: bug#25101: [PATCH 1/2] gnu: Add hpaio-enabled sane-backends variant.
has caused the debbugs.gnu.org bug report #25101,
regarding simple-scan can't use hpaio
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)


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From: Danny Milosavljevic <dannym <at> scratchpost.org>
To: <bug-guix <at> gnu.org>
Subject: simple-scan can't use hpaio
Date: Sat, 3 Dec 2016 19:41:13 +0100

simple-scan can't use hpaio as scanner. That means that HP scanners don't work at all.

That's because:

(1) sane-backends installs a hard-coded dll.conf . In itself, that's not so bad. However, this file doesn't contain a line "hpaio". 
    To workaround this, I set environment variable SANE_CONFIG_DIR to point to a directory which contains a dll.conf which contains (only) a line "hpaio".
(2) sane-backends tries to load /gnu/store/f4kmkdf8s0kpwia9wgiw5a35xljh4a77-sane-backends-1.0.25/lib/sane/libsane-hpaio.so.1 - which won't work. 
    I checked the source code of sane-backends - and it searches many locations for loadable dynamic libraries, for example the ones specified in environment variables LD_LIBRARY_PATH, SHLIB_PATH LIBPATH (see backend/dll.c load()). 
(3) dll.conf has no support for absolute paths. Whatever you put there it will just blindly put after a hard-coded directory prefix.

This is on GuixSD.

How to proceed? Add support for absolute paths and a service which merges multiple dll.conf into one file ?

Or just add hplip as a hard dependency of sane-backends and make it link libsane-hpaio (that's possible in sane)?

Also, should we also amend simple-scan to propagate-input hplip? Otherwise it will come up with a "Install Driver" dialog which won't work either.

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From: ludo <at> gnu.org (Ludovic Courtès)
To: Andy Patterson <ajpatter <at> uwaterloo.ca>
Cc: 25101-done <at> debbugs.gnu.org
Subject: Re: bug#25101: [PATCH 1/2] gnu: Add hpaio-enabled sane-backends
 variant.
Date: Sat, 17 Dec 2016 23:12:41 +0100

Hello!

Andy Patterson <ajpatter <at> uwaterloo.ca> skribis:

> Here's some patches implementing what you've suggested. I decided to use the
> full "sane-backends" for the other dependents, since I guessed that they need
> some backend support. If anyone knows that that's not required, it can be
> changed.

I think that’s fine.

Applied all 3 patches.  I also fixed a reproducibility issue due to
timestamps in a subsequent commit.

Thanks!

Ludo’.

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