[Printing-architecture] 'driverless' doesn't find CUPS shared print queues - expected or a bug?

Zdenek Dohnal zdohnal at redhat.com
Mon Jun 7 06:29:31 UTC 2021

Hi Till,

I have an bug which I can reproduce in my LAN 
(https://bugzilla.redhat.com/show_bug.cgi?id=1954469) and in that bug 
Solomon reported a problem which he has with driverless in his setup.

He uses client and server topology in his LAN where server shares print 
queues in LAN, and 'driverless' on the client machine doesn't return any 
uris, but ippfind and avahi-browse can see the queues.

Is it an expected behavior or a bug?

AFAIK 'driverless' has never returned remote print queues in the past, 
and driverless sets '! --txt printer-type' to exclude remote print 
queues during generating ippfind arguments, so IMO it is the expected 
behavior. IIUC driverless was introduced to have a way how to install 
driverless print queue for a printer in cases when GUI isn't able to 
work with temp queues. And remote CUPS queues were intended to be 
covered via cups-browsed, so that can be the reason (together with the 
reason that they aren't real devices) why driverless doesn't report them.

I'm writing this to verify my findings and my understanding of the code 
with you as the original author, so I will not mystify other people in 
the future.

Thank you in advance and have a nice day,


Zdenek Dohnal
Software Engineer
Red Hat Czech - Brno TPB-C

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