Bug 985603

Summary: cups-browsed.service not enabled by default
Product: [Fedora] Fedora Reporter: Andrew Blum <ablum>
Component: cupsAssignee: Tim Waugh <twaugh>
Status: CLOSED NOTABUG QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: unspecified Docs Contact:
Priority: unspecified    
Version: 19CC: jpopelka, twaugh, vgaikwad
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Last Closed: 2013-07-18 07:18:52 UTC Type: Bug
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Description Andrew Blum 2013-07-17 20:56:07 UTC 
Description of problem:
The BrowsePoll directive has been moved from to the new cups-browsed daemon (https://bugzilla.redhat.com/show_bug.cgi?id=881101).

The cups-browsed daemon is not enabled by default however.

Version-Release number of selected component (if applicable):
cups-1.6.2-12.fc19.x86_64
cups-filters-1.0.34-7.fc19.x86_64


Steps to Reproduce:
1. Look at systemctl output from a default F19 install

Actual results:
 systemctl | grep cups
cups.path                   loaded active waiting   CUPS Printer Service Spool
cups.service                loaded active running   CUPS Printing Service
cups.socket                 loaded active running   CUPS Printing Service Sockets


Expected results:
# systemctl | grep cups
cups.path                   loaded active waiting   CUPS Printer Service Spool
cups-browsed.service        loaded active running   Make remote CUPS printers available locally
cups.service                loaded active running   CUPS Printing Service
cups.socket                 loaded active running   CUPS Printing Service Sockets


Additional info:
Needed to add the BrowsePoll to /etc/cups/cups-browsed.conf (though the configuration file did exist)

# egrep ^BrowsePoll /etc/cups/cups-browsed.conf
BrowsePoll my.example.print.server:631

Then enable and start the cups-browsed unit:

# systemctl enable cups-browsed.service
# systemctl start cups-browsed.service
Comment 1 Tim Waugh 2013-07-18 07:18:52 UTC 
I don't think it should be enabled by default.

The only built-in mechanism for CUPS print queue discovery is DNS-SD, using Avahi. Discovery is done in the client application (in libcups). DNS-SD support for CUPS is in all supported releases of Fedora.

The Browsing/BrowsePoll support in cups-browsed is for people who cannot use DNS-SD for discovery for any reason. It is a "last resort", provided for compatibility reasons.

Enabling the cups-browsed service automatically would cause duplication of queues in systems where the DNS-SD support already works automatically (i.e. remote CUPS server supports DNS-SD, Avahi running on local system and not firewalled off).
Comment 2 Jiri Popelka 2013-07-18 07:35:42 UTC 
Ok, I see Tim just commented, but here are also my 2c.

(In reply to Andrew Blum from comment #0)
> The BrowsePoll directive has been moved from to the new cups-browsed daemon

Yes, CUPS no longer supports cups browsing protocol because preferred mechanism has been DNS-SD. cups-browsed has been created as a backward compatibility tool.

> The cups-browsed daemon is not enabled by default however.

Correct and I don't see a reason why it should be.
It has a specific use and for example most of the users in home environment will never need it running.