GNU bug report logs - #38929
sane-hpaio not found by simple-scan?

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Arne Babenhauserheide <arne_bab <at> web.de>
To: bug-guix <at> gnu.org
Subject: sane-hpaio not found by simple-scan?
Date: Sat, 04 Jan 2020 23:38:46 +0100

I have a scanner in HP Photosmart C3100 series. Using simple-scan I get
the information that I need to install the driver sane-hpaio.

But simple-scan has sane-backends as input for which the Guix source file
says "This variant links in the hpaio backend, provided by hplip".

So somehow simple-scan does not find ~/.guix-profile/lib/sane/hpaio.so.1
(which exists).

It actually works when I call it as follows:

LD_LIBRARY_PATH="${LD_LIBRARY_PATH}:$HOME/.guix-profile/lib" simple-scan

But this cannot be the proper solution.

Best wishes,
Arne
-- 
Unpolitisch sein
heißt politisch sein
ohne es zu merken

Message #8 received at 38929 <at> debbugs.gnu.org (full text, mbox):

From: raid5atemyhomework <raid5atemyhomework <at> protonmail.com>
To: "38929 <at> debbugs.gnu.org" <38929 <at> debbugs.gnu.org>
Subject: Re: sane-hpaio not found by simple-scan?
Date: Wed, 10 Feb 2021 12:32:44 +0000

I have a USB-connected HP DeskJet Ink Advantage 1515 printer/scanner.

On my own system (this is a full Guix System, not Guix on a foreign distro) I modified the configuration.scm:

```scheme
(use-package-modules #;... scanner)

(operating-system
  #;...
  (services
    (append
      #;...
      (modify-services %desktop-services
        (sane-service-type _ => sane-backends))))
  #;...)
```

After `sudo guix system reconfigure configuration.scm`, `simple-scan` still could not find it.  However, on reboot, it was able to find my already-connected USB printer/scanner without any issues.

Perhaps only some kind of force-trigger of `udev` would be needed after the above setup, but `udev` is pretty early in the Shepherd tree.

On the other hand the `sane-service-type` documentation in `info guix` is ***severely*** lacking, and the documentation is somehow lost in the middle of documentation about geolocation services, so it should probably be fixed.

Thanks
raid5atemyhomework

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