[Dovecot] mdbox: Is there any more info on the "cleanup" step? (Dovecot 2.0beta5)

[Timo Sirainen]

On Thu, 2010-05-13 at 10:33 +0100, William Blunn wrote:
> The wiki page which mentions mdbox talks about a "cleanup" step for mdbox:
> 
> : The space is later freed in "cleanup" step. This may be done
> : automatically within the session or later in a nightly cronjob when
> : there's less disk I/O. The cleanup first finds all files that have
> : refcount=0 mails. Then it goes through each file and copies the
> : refcount>0 mails to other dbox files (to the same files as where newly
> : saved messages would also go), updates the map index and finally
> : deletes the original file. So there is never any overwriting or file
> : truncation.
> 
> I was wondering if there was any code to actually do this, or any 
> command-line tools (and if either of those where they might be), or 
> whether it was just design musings at the minute.

doveadm purge does this step. There were also some plans to do it
automatically sometimes, but this doesn't happen currently.