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Subject: |
simple-scan can't use hpaio |
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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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--- Begin Message ---
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Subject: |
Re: bug#25101: [PATCH 1/2] gnu: Add hpaio-enabled sane-backends variant. |
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Date: |
Sat, 17 Dec 2016 23:12:41 +0100 |
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User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/25.1 (gnu/linux) |
Hello!
Andy Patterson <address@hidden> 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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