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[Bug 735404] CUPS 1.6 has major incompatible changes. Do not use CUPS 1.6 on production systems!

https://bugzilla.novell.com/show_bug.cgi?id=735404

https://bugzilla.novell.com/show_bug.cgi?id=735404#c58


--- Comment #58 from Till Kamppeter <till.kamppeter@xxxxxxxxx> 2013-11-22
18:38:24 UTC ---
Yes, the foomatic-filters package is now discontinued and cups-filters takes
its role now with the new included foomatic-rip filter.

The foomatic-filters package contains also beh but my feeling was all the time
that no one uses it, especially it does not work with filters which have to run
as root, as itself does not run as root. Perhaps it works if one would set
beh's permissions to run as root, but then it also runs filters as root which
should not run as root. Or one lets beh run as root, but check the filter which
it calls and run it unprivileged if its permissions tell it should not run as
root. Patches welcome.

It is also written in Perl, but nothing else in the printing stack is written
in Perl. It should perhaps be rewritten in C or shell. Also here patches
welcome.

Your pipe filter is a good idea, but I see a little missing feature. All CUPS
filters/backends get the IPP attributes/options via the 5th command line
argument. There is no way in pipe to make use of these, so that you can control
the command line being called by pipe by supplying options to your print job.

Also no program which is not explicitly written for the use with pipe uses the
PIPE_BACKEND_ARGV[0-6] environment variables, and if you write a program
especially for being called with pipe you can directly write a CUPS backend.

Also programs called by pipe run as lp if pipe is installed world-executable
and run as root if pipe is installed root-only-executable. So one installed
pipe cannot serve both use cases on the same machine.

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