Accepted: cups-pdf 2.4.6-4ubuntu1 (source)

Matt Zimmerman mdz at
Tue Nov 20 12:12:56 GMT 2007

On Tue, Nov 20, 2007 at 12:06:32PM +0000, Till Kamppeter wrote:
> Matt Zimmerman wrote:
>> On Tue, Nov 20, 2007 at 10:30:22AM -0000, Till Kamppeter wrote:
>>>    * debian/postinst, debian/postrm: Restart of CUPS daemon not needed,
>>>      restarting only causes CUPS daemon not listening immediately after
>>>      restart and so the PDF queue not being created. So removed any
>>>      restart of the CUPS daemon from the maintainer script. We only start
>>>      the CUPS daemon if it is not actually running, because we need it
>>>      for having a PDF printer (LP: #152293).
>> This does not sound correct to me.  If you don't restart CUPS in postinst,
>> then the old version will still be running after the upgrade.
>> Can you explain?
> From version 1.2.x on CUPS does not need to be restarted any more when 
> adding PPDs and backends and it never needed to be restarted after adding a 
> queue with lpadmin. cups-pdf does nothing more than that. The installation 
> of the package adds the cups-pdf backend and the PPD file, the postinst 
> script runs lpadmin to add the queue. All these actions do not require CUPS 
> to be restarted. The fallback to adding the queue by editing configuration 
> files is only done if CUPS is not running. Next time CUPS starts it will 
> see and use the queue then.

It is standard practice when upgrading a package with a daemon to ensure
that the new version is running (this is even done for base infrastructure
like upstart).

Consider, for example, that a security fix may have been applied in the new
version, and would not take effect unless the daemon were restarted.

As far as I can tell, the only reason you changed this was because you
needed the daemon to be running in order to add the PDF queue.  A better
solution would be to wait for it to start before adding the queue, rather
than removing the code which restarts it.

 - mdz

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