[sane-devel] saned at service environment question

[Olaf Meeuwissen]

Hi ToddAndMargo,

ToddAndMargo writes:

> Dear list,
>
> In the man page, the script for saned at .service shows:

# OK, you are reading the documentation, just rather selectively ;-)

> Environment=SANE_CONFIG_DIR=/etc/sane.d
> # If you need to debug your configuration uncomment the next line and
> # change it as appropriate to set the desired debug options
> # Environment=SANE_DEBUG_DLL=255 SANE_DEBUG_BJNP=5
>
> https://bugzilla.redhat.com/show_bug.cgi?id=1091566#c8
> also adds:
>
> #Environment=SANE_DEBUG_DLL=128 SANE_DEBUG_NET=128
>
> Question:
> Do you un-comment the all, or only uncomment one of them?

You add the SANE_DEBUG_* variables for the backends you want to debug.
In your case, you probably want to look at least at SANE_DEBUG_DLL and
SANE_DEBUG_NET and the backend that supports your particular scanner.

> Question:
>
> Should it not be?
>
> Environment=SANE_CONFIG_DIR=/etc/sane.d SANE_DEBUG_DLL=255
> SANE_DEBUG_BJNP=5 SANE_DEBUG_NET=128
>
> all run togther with spaces as the demlimier?

Please read the systemd documentation.  I vaguely seem to remember all
the Environment "assignments" are run together by systemd, though.

# Disclaimer: I no longer use systemd.

> Questions:
>
> What is
>        SANE_CONFIG_DIR=/etc/sane.d

An environment variable that tells the dll (and most other backends)
where to look for their configuration.  See sane-dll(5).

>        SANE_DEBUG_DLL=255
>        SANE_DEBUG_BJNP=5, and
>        SANE_DEBUG_NET=128

Environment variables that tell each of the backend how much to log.
Larger values produce more output.  What and how much exactly differs
between backends.

Hope this helps,
--
Olaf Meeuwissen, LPIC-2            FSF Associate Member since 2004-01-27
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