CUPS printer filtering on LTSP fat clients

[Nick Fenger]

Veli-Matti et al,

Have you/anyone figured out how to read the LDM_PRINTER_LIST setting from
lts.conf with fat clients?

In a thin client setup, I notice PRINTER_LIST is passed when XSession is
started, which is not the case with fat clients.

ltsp005   1000  0.0  0.0  12312   272 ?        Ss   May13   0:00 bash -c
XDG_DATA_DIRS=/tmp/ltsp-localapps-ltsp005-BFCbvt/:/usr/local/share/:/usr/share/
LTSP_CLIENT=10.0.40.103 LTSP_CLIENT_HOSTNAME=ltsp005
*PRINTER_LIST=LEP-Room-205,The-Printer-In-This-Room*LIBGL_ALWAYS_INDIRECT=true
LC_ALL=en_US.UTF-8 LANGUAGE=en_US.UTF-8
LANG=en_US.UTF-8 DISPLAY=10.0.40.103:7
PULSE_SERVER=tcp:10.0.40.103:4713ESPEAKER=
10.0.40.103:16001 LTSP_ALSA_DEFAULT=pulse */etc/X11/Xsession* "default" <
/dev/null > /dev/null ; /usr/sbin/ltspfsmounter all cleanup




On Thu, May 5, 2011 at 6:48 AM, Veli-Matti Lintu <
veli-matti.lintu at opinsys.fi> wrote:

> Hello everyone,
>
> I'd have a quick question about the CUPS printer filtering patch that is
> in the Ubuntu CUPS version (the patch can be found at least here:
> http://patches.ubuntu.com/by-release/extracted/ubuntu/c/cups/1.4.1-5ubuntu2/printer-filtering.dpatch
> )
>
> If I understand correctly, it is used on LTSP systems by adding
> LDM_PRINTER_LIST setting in lts.conf which is then turned to PRINTER_LIST
> environment variable when the user logs in. The patch above then filters
> not listed printers out from the user's printer list.
>
> As here we are running quite a few fat clients that have their own local
> USB printers, we changed from configuring fat clients to use LTSP server's
> cups via /etc/cups/client.conf and instead run a local CUPS server on the
> fat clients. The CUPS server on the LTSP server broadcasts printer
> information to the LTSP network and the local CUPS processes on the fat
> clients then pick up the printers from the broadcasts. CUPS adds local USB
> printers automatically and they don't need to be configured through server
> lts.conf. Of course they are not usable by other users in the network, but
> it's not a problem.
>
> This works nicely as long as we want to show all printers to the user. In
> bigger environments where a cluster of servers serves many schools, this
> doesn't work so nicely and that's where the LDM_PRINTER_LIST setting helps.
> The problems come when we want to show also the local USB printers that
> CUPS configures automatically when they are attached. As the
> LDM_PRINTER_LIST doesn't include the local printers, they are always
> filtered out from the printer list.
>
> We've been now doing some test patches to filter out only printers that
> are not local, but I'd be interested to know if anyone else has tried using
> a setup like this? The same filtering could be also applied to laptops if
> the PRINTER_LIST env variable is set somewhere when the user logs in.
>
> Ideas? Comments?
>
> Veli-Matti
>
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