[cups.general] Writing Filters - Permission denied

[Helge Blischke]

Lukas Thiemeier wrote:
> 
> Hello there,
> 
> I've a problem running my own Cups-filters.
> 
> The Filter itself works just fine. I've changed the mime.convs to make
> Cups use it, and the Printers output is great.
> (mime.convs: text/plain application/vnd.cups-postscript 33 a2ps_wrapper)
> 
> But i do not want to use this filter for ever printer, but only for one
> single queue.
> So I changed back the mime.convs Entry to use texttops, and changed my 
> queues ppd in /etc/cups/ppd:
> new Entry in test.ppd:
>     *cupsFilter: "text/plain 33 a2ps_wrapper"
> 
> When I now print on this queue, Cups tries to start the correct Filter,
> but is not able to. The error.log says:
> 
> I [23/Aug/2007:18:14:58 +0200] [Job 3331] Started filter 
> /usr/lib/cups/filter/a2ps_wrapper (PID 16734)
> D [23/Aug/2007:18:14:58 +0200] Discarding unused job-state event...
> D [23/Aug/2007:18:14:58 +0200] cupsdProcessIPPRequest: 26 status_code=0 
> (successful-ok)
> D [23/Aug/2007:18:14:58 +0200] [Job 3331] 
> /usr/lib/cups/filter/a2ps_wrapper: Permission denied
> E [23/Aug/2007:18:14:58 +0200] PID 16734 
> (/usr/lib/cups/filter/a2ps_wrapper) stopped with status 22!
> D [23/Aug/2007:18:14:58 +0200] [Job 3331] File 0 is complete.
> E [23/Aug/2007:18:14:58 +0200] [Job 3331] Job stopped due to filter errors.
> 
> The whole World may read and execute the Filter, and if i start it from 
> the commandline as root or as user lp, its just fine.
> 
> Do I have to introduce the Filter to Cups in some way? Or Do you have 
> any other ideas? For me, the most confusing part of this Problem is, 
> that the Filter works perfectly if I put it in mime.convs, but Cups has 
> no permissions to start it using the PPD-Entry.
> 
> Thanks for your Help, and excuse my bad English, please :)
> 
> greetings, Lukas Thiemeier
> 
> 

You need to make the execute permissions for
your filter suitable for user lp (or whatever
the CUPS filters run under on your system).

Helge

-- 
Helge Blischke
Softwareentwicklung

H.Blischke at acm.org