Bug 416101

Description of problem:

I tried to print to a printer discovered on the local network, but attempts to
print a test page failed.  After enabling debug logging in /etc/cups/cupsd.conf,
I was able to determine that the problem was local to my AMD64 system - it was
looking for the ipp driver in /usr/lib64/cups/backend/ but there was no such
directory - all the [64-bit] backends are in /usr/lib/cups/backend/.

Version-Release number of selected component (if applicable):

cups-1.2.12-8.fc7
kdelibs-3.5.8-7.fc7

How reproducible:

At least once

Steps to Reproduce:
1. use KDE print configuration tools to configure CUPS
2. configure remote printer from another system using CUPS (manually, or by
discovery)
3. restart cups
4. try to print test page
  
Actual results:

Nothing prints, following errors in /var/log/cups/error_log:

I [07/Dec/2007:13:44:31 -0500] Started backend /usr/lib64/cups/backend/ipp (PID
23639) for job 2.
E [07/Dec/2007:13:44:31 -0500] PID 23639 (/usr/lib64/cups/backend/ipp) stopped w
ith status 22!
I [07/Dec/2007:13:44:31 -0500] Hint: Try setting the LogLevel to "debug" to find
 out more.
I [07/Dec/2007:13:44:31 -0500] [Job 2] Backend returned status 22 (unknown)

and with debug turned on:

I [07/Dec/2007:14:02:27 -0500] Started backend /usr/lib64/cups/backend/ipp (PID
23914) for job 4.
D [07/Dec/2007:14:02:27 -0500] Discarding unused job-state event...
D [07/Dec/2007:14:02:27 -0500] cupsdProcessIPPRequest: 11 status_code=0 (success
ful-ok)
D [07/Dec/2007:14:02:27 -0500] [Job 4] /usr/lib64/cups/backend/ipp: No such file
 or directory
...
D [07/Dec/2007:14:02:27 -0500] [Job 4] File 0 is complete.
I [07/Dec/2007:14:02:27 -0500] [Job 4] Backend returned status 22 (unknown)
D [07/Dec/2007:14:02:27 -0500] Discarding unused job-stopped event...
D [07/Dec/2007:14:02:28 -0500] Unloading job 4...

Expected results:

test page printed

Additional info:

Workaround - I was able to workaround this by creating a symlink:

ln -s ../lib/cups /usr/lib64/cups

Later, I discovered that /etc/cups/cupsd.conf had the following line:

ServerBin /usr/lib64/cups

and I replaced this with

ServerBin /usr/lib/cups

and removed the symlink.

I suspect that this problem actually resulted from the use of KDEPrint to set up
the /etc/cups/cupsd.conf file, based on the comment at the start of the file:

# CUPS configuration file, generated by CUPS configuration tool.
# This tool is part of KDEPrint, the printing framework for KDE
# since version 2.2.2 and is used by the CUPS supporting module
# in KDEPrint. The predecessors to KDEPrint in former KDE releases
# were KUPS and QtCUPS; they are deprecated and no longer maintained.
#
# Author: Michael Goffioul
#
# Web site: http://printing.kde.org/
#
########################################################################
#                                                                      #
# This is the CUPS configuration file.  If you are familiar with       #
# Apache or any of the other popular web servers, we've followed the   #
# same format.  Any configuration variable used here has the same      #
# semantics as the corresponding variable in Apache.  If we need       #
# different functionality then a different name is used to avoid       #
# confusion...                                                         #
#                                                                      #
########################################################################