[Dovecot] Restarting dovecot periodically fails with "Socket already exists: /var/run/dovecot/anvil"

[Timo Sirainen]

On Thu, 2011-10-13 at 16:13 +0100, James Page wrote:

> restarting dovecot regularly fails with version 2.0.13 on Ubuntu 11.10
> due to a running child process exiting after the main dovecot process.
> 
> Oct 13 15:04:58 ubuntu dovecot: master: Error: service(anvil): Socket
> already exists: /var/run/dovecot/anvil

> This is an Ubuntu specific issue as we use upstart to manage dovecot
> which monitors the status of the main dovecot process; the Debian init
> script appears to make provision for this happening.

http://hg.dovecot.org/dovecot-2.1/rev/6894298ae5fd should apply to v2.0
as well, but since it's a bit large change I don't know if I should
backport it, at least without some more testing.