[cups.development] Is cupsGetPPD supposed to fetch PPDs from remote servers?
vadim.troshchinskiy at qindel.com
Tue Dec 14 08:54:27 PST 2010
Hi! I'm debugging an issue with printing from a Java program. The setup is as
The program runs inside a VM. The user connects to the VM with NX. Within the
VM, there's a CUPS instance running. Also, NX forwards port 2100 on the VM to
port 631 on the computer running the NX client. For the sake of making testing
easier in this case I'm using cups-pdf as the printer on the client side. The
CUPS in the VM is then configured as follows:
# Printer configuration file for CUPS v1.4.3
# Written by cupsd
# DO NOT EDIT THIS FILE WHEN CUPSD IS RUNNING
JobSheets none none
The issue is that Java programs fail to print. Debugging the applications
shows that first it tries to open the printer's PPD in /etc/cups/ppd/, fails to
find it there, then tries to request it from localhost:631, that also fails,
and gives up there. Java fails to obtain useful information about the printer,
so printing fails to work.
I looked at the code of openjdk, which turned out to contain a simple call to
cupsGetPPD. The way that code looks like it seems unlikely to be the problem.
Then, I think the question is, is what happens a bug, and what should be
happening? For instance:
Should cupsGetPPD notice that Virtual_PDF_Printer is at
ipp://127.0.0.1:2100/printers/Virtual_PDF_Printer and fetch the PPD from
http://127.0.0.1:2100/printers/Virtual_PDF_Printer? (it tries
http://127.0.0.1:631/printers/Virtual_PDF_Printer which gets a 404)
Or, perhaps if a PPD is requested from the local CUPS it should fetch it from
the remote one and then deliver it?
Or, are PPDs always supposed to be available locally?
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