[sane-devel] scripting hooks for scanner backend

[m. allan noah]

to be perfectly honest, it sounds like a solution looking for a
problem. make the add device script setuid, or run it from root's cron
every minute or so.

allan

On Sun, Jan 25, 2009 at 4:42 PM, Felix Salfelder <felix at salfelder.org> wrote:
> Hello list.
>
> As some of you might have experienced, and as it is frequently
> subjected, scsi scanners have to be manually added to the scsi subsystem
> by invoking some scsi-add command as root before talking to the scanner
> is possible. I am currently experimenting with shell-aliases and
> overriding paths, to hook this routine into the various sane
> executables.
>
> Now all of this seems a bit clumsy, and brought me to the idea to simply
> add scripting hooks into the sane-backend. i would think of about two
> additional configuration options like "prescan-hook" and "postscan-hook"
> to be added to the respective backend configuration files
> /etc/sane.d/abcd.conf. Here paths executables could be set to be hooked
> before a device is initialized and after is is left alone respectively.
>
> This would not only allow a simple solution (workaround?) to the
> motivating scsi-add issue. These hooks could be used for instance to
> toggle the power-supply of a scanner, or open/close firewalls, when
> using a network-device. This could also give a qu^H^Hdirty ad-hoc fix to
> future driver/udev bugs requiring the user to, say, reload modules or
> create nodes before/after scanning. I bet there are even better and
> useful applications for this.
>
> Now since the manuals don't mention something like this, I suppose it
> has not been implemented yet. Would anybody find this useful? Or is
> there a better/simpler approach for hooking scripts? Is there even a
> clean solution for the scsi-add thing I have not considered? Does
> anybody completely dislike the idea of this sort of hooking?
>
> Regards
> Felix
>
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