CentOS CUPS issue

[Howard White]

My Google foo does not register one bar on the meter...

So I may be the only sysadmin on the planet that looks at lpstat -o. We
have customers that print, a lot. I am seeing vestigial print jobs
listed in lpstat -o such that if one tries to cancel <jobnum>, the
message "cancel-job failed: Job #<jobnum> does not exist!" They just
had to put the exclamation point on the end there to thumb the systems
nose at the operator; "You ninny!" If I subsequently type cancel -a,
they all go away and the list is empty.

I have started running the Nagios test check_cups_queue which relies on
the same command information and is similarly distracted by the
vestigial print jobs.

I have seen this behavior on CentOS 6 and 7. Anybody got any leads on
how I might find a bug listing? Hell, I haven't been able to find how
to check for what version of CUPS is installed.

So Happy It's Thursday...

Howard

[Tilghman Lesher]

As for finding bug reports, try here:
https://github.com/apple/cups/issues?utf8=%E2%9C%93&q=is%3Aissue+lpstat+

CUPS is a weird beast, because it's literally communicating on a
client-server basis, which means that the CUPS server is literally
saying that those jobs exist in some form or fashion, even if they
cannot be canceled. My suspicion is that they're not cancelable
because they're in a canceled state, waiting for some timeout. In
which case, it's probably a fault either in the client for not
interpreting those jobs as effectively gone, or in the server, for
failing to indicate that status.

The source is also perusable in that repository, although its location
is not entirely obvious. You'd think it's a core command, but it's
not. No, it's part of the System V integration:
https://github.com/apple/cups/blob/master/systemv/lpstat.c
This might also be why the bug persisted.

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--
Tilghman