What sets FINAL_CONTENT_TYPE? - need clarification on cupsFilter2 keyword in PPD

[Paul Conklin]

It looks like there is a new PPD option starting with CUPS 1.5 (cupsFilter2) that looks like it will do what I need, but I'm having problems getting it to work right.  from reading here http://www.cups.org/documentation.php/doc-1.6/spec-ppd.html it appears it will let you "short circuit" the mime chain.  in 1.6 i get this
[root at CUPS cups1.6b1]# echo "make me some coffee" | lp -dmytest
lp: Unsupported document-format "text/plain".

even though i have this in my PPD
*cupsFilter2:    "text/plain application/vnd.paul 0 coffee"

I also have a paul.types file in /etc/cups to "register" the type

if i regress back to 1.5.3, it bypasses the "coffee" filter all together and converts it to vnd.cups-postscript.

so either it actually came about in 1.6 and I am still doing something wrong or 1.5 and 1.6 treat it differntly as the only change i did between tests is re-compiled

1.5.3
[root at CUPS cups-1.5.3]# echo "make me some coffee" | lp -dmytest
request id is mytest-13 (0 file(s))



>
> Hello,
>
> On May 29 21:10 Paul Conklin wrote (excerpt):
> > why the filter chain seems to keep changing
>
> The filter chain depends on input data type and print queue
> (more precisely the final data type which the printer needs)
> so that for same input data type and same print queue
> the filter chain should not change - provided there is not
> whatever black magic that changes the *types and *convs
> files (in /etc/cups/ and also in /usr/share/cups/mime/)
> which define the possible filter chains - at least this is
> how I understand how it works.
>
> > it seems the FINAL_CONTENT_TYPE keeps changing from
> > application/<printer name> to application/vnd.cups.postscript
>
> Off the top of my head I don't know the details of the underlying
> mechanism how FINAL_CONTENT_TYPE is set, I found it mentioned in
> http://www.cups.org/documentation.php/doc-1.5/spec-ppd.html
> and in
> http://www.cups.org/documentation.php/doc-1.5/api-filter.html
>
> Perhaps this might help you a bit to find out what exactly
> goes on on your system.
>
>
> Kind Regards
> Johannes Meixner
> --
> SUSE LINUX Products GmbH -- Maxfeldstrasse 5 -- 90409 Nuernberg -- Germany
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>