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

Message #11 received at 38929 <at> debbugs.gnu.org (full text, mbox):

From: Rostislav Svoboda <rostislav.svoboda <at> gmail.com>
To: guix-patches <at> gnu.org,
	38929 <at> debbugs.gnu.org
Cc: Rostislav Svoboda <Rostislav.Svoboda <at> gmail.com>
Subject: [PATCH] gnu: simple-scan: enable scanning over network for eSCL/WSD
 scanners
Date: Mon,  9 Jun 2025 15:21:03 +0200

* gnu/packages/gnome.scm (simple-scan)[inputs]: Add sane-airscan.
<#:phases>: Wrap simple-scan to set
  - LD_LIBRARY_PATH to sane-airscan's lib/sane
  - SANE_CONFIG_DIR to sane-airscan's etc/sane.d

This change allows simple-scan to automatically detect and use eSCL or WSD
(AirScan) backends over the network.

Change-Id: Id1d95c77c3fc549b7baf91d31049541a687bce2d
---
 gnu/packages/gnome.scm | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/gnu/packages/gnome.scm b/gnu/packages/gnome.scm
index 56236013a7..3bc26192ff 100644
--- a/gnu/packages/gnome.scm
+++ b/gnu/packages/gnome.scm
@@ -7330,7 +7330,19 @@ (define-public simple-scan
         (base32 "1aghnkvjdyj73kv55nd9gl5b1xjkpcxjn4j3a6z67r9g2j86avn1"))))
     (build-system meson-build-system)
     (arguments
-     '(#:glib-or-gtk? #t))
+     (list
+      #:glib-or-gtk? #t
+      #:phases
+      #~(modify-phases %standard-phases
+          (add-after 'install 'wrap-flatpak
+            (lambda* (#:key inputs #:allow-other-keys)
+              (let ((simple-scan (string-append #$output "/bin/simple-scan"))
+                    (sane-airscan-inputs (assoc-ref inputs "sane-airscan")))
+                (wrap-program simple-scan
+                  `("LD_LIBRARY_PATH" =
+                    (,(string-append sane-airscan-inputs "/lib/sane")))
+                  `("SANE_CONFIG_DIR" prefix
+                    (,(string-append sane-airscan-inputs "/etc/sane.d"))))))))))
     (native-inputs
      (list gettext-minimal
            itstool
@@ -7347,6 +7359,7 @@ (define-public simple-scan
            gdk-pixbuf
            gusb
            libadwaita
+           sane-airscan
            sane-backends))
     (home-page "https://gitlab.gnome.org/GNOME/simple-scan")
     (synopsis "Document and image scanner")

base-commit: 03ce76718c41b32d174713c945d269d6fcdd8bf1
-- 
2.49.0

Message #14 received at 38929 <at> debbugs.gnu.org (full text, mbox):

From: Liliana Marie Prikler <liliana.prikler <at> gmail.com>
To: Rostislav Svoboda <rostislav.svoboda <at> gmail.com>, 78732 <at> debbugs.gnu.org, 
 38929 <at> debbugs.gnu.org
Cc: Noé Lopez <noelopez <at> free.fr>,
 Vivien Kraus <vivien <at> planete-kraus.eu>,
 Maxim Cournoyer <maxim.cournoyer <at> gmail.com>
Subject: Re: [bug#78732] [PATCH] gnu: simple-scan: enable scanning over
 network for eSCL/WSD scanners
Date: Mon, 09 Jun 2025 20:34:02 +0200

Am Montag, dem 09.06.2025 um 15:21 +0200 schrieb Rostislav Svoboda:
> * gnu/packages/gnome.scm (simple-scan)[inputs]: Add sane-airscan.
> <#:phases>: Wrap simple-scan to set
>   - LD_LIBRARY_PATH to sane-airscan's lib/sane
>   - SANE_CONFIG_DIR to sane-airscan's etc/sane.d
> 
> This change allows simple-scan to automatically detect and use eSCL
> or WSD (AirScan) backends over the network.
> 
> Change-Id: Id1d95c77c3fc549b7baf91d31049541a687bce2d
The LD_LIBRARY_PATH looks suspicious.  Is there any way around it using
other SANE tooling?

Cheers

Message #17 received at 38929 <at> debbugs.gnu.org (full text, mbox):

From: Rostislav Svoboda <rostislav.svoboda <at> gmail.com>
To: Liliana Marie Prikler <liliana.prikler <at> gmail.com>
Cc: Vivien Kraus <vivien <at> planete-kraus.eu>, 38929 <at> debbugs.gnu.org,
 78732 <at> debbugs.gnu.org, Noé Lopez <noelopez <at> free.fr>,
 Maxim Cournoyer <maxim.cournoyer <at> gmail.com>
Subject: Re: [bug#78732] [PATCH] gnu: simple-scan: enable scanning over
 network for eSCL/WSD scanners
Date: Mon, 9 Jun 2025 21:38:10 +0200

[Message part 1 (text/plain, inline)]

Hello

> The LD_LIBRARY_PATH looks suspicious.

What exactly is suspicious?

>  Is there any way around it using other SANE tooling?

AFAIK there's no simpler runtime-only solution:
- You could use patchelf to prepend the store's lib/sane directory
onto the binary's RPATH, but that's as even even more fiddly as
setting LD_LIBRARY_PATH
- sane-config only spits out compile-time flags (-I..., -L...,
-lsane); it doesn't tell the loader where to find backends at runtime.

BTW, I've polished the patch. Please ignore the previous one - the
phase name was wrong ("wrap-flatpak" instead of "wrap-simple-scan").


Cheers

[0001-gnu-simple-scan-enable-scanning-over-network-for-eSC.patch (text/x-patch, attachment)]

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