Get cyrus-imap folder size without "du" tool

[Bron Gondwana]

On Fri, Apr 02, 2010 at 01:40:38PM -0400, Wesley Craig wrote:
> On 02 Apr 2010, at 08:59, Bron Gondwana wrote:
> >Anyway, the quota system works fine.  Just give each user a quota
> >bigger
> >than your disk and use it for the used value!
> 
> It's a shame that the usage isn't calculated whether a limit is
> implemented or not.

Hmm... the issue is that quota roots are somewhat fungible.  Most people
just set them on the user's INBOX and sub-folders inherit them by default,
but that's just one option - you can set quotas on subtrees, or even take
them up to an entire domain.

Making the annotation use quota_mailbox_used and making sure that gets
calculated regardless (it does) would be a good help though - then you
only have to read the index headers at least.

imap/append.c
308:    as->m.quota_mailbox_used += as->quota_used;

I guess allowing "-1" to be set as a limit might make sense... but I'd
want to check the RFC about the QUOTA command to make sure that clients
can accept seeing the information...

Bron.