[Dovecot] maildir maintenance?

Brian Kroth bpkroth at gmail.com
Wed Nov 24 21:28:31 EET 2010

Timo Sirainen <tss at iki.fi> 2010-11-24 19:04:
> On 24.11.2010, at 18.59, Brian Kroth wrote:
> >>> Hi, I'm running version 1.2.15 (so no doveadm)
> >> You could build Dovecot v2.0 and only use doveadm binary from it.
> > 
> > Does it just issue the command via IMAP?  No direct filesystem
> > operations?
> It's all direct filesystem operations, no IMAP. But v1.2.15 can read v2.0's index files just fine.
> >> Looks about ok. The main thing I'm worried is what happens if user creates mailboxes containing " or ' or ` characters.
> > 
> > Yeah, that was mostly me being lazy in my wanting to deal with escaping,
> > so I just ignored them.
> > 
> > In what I originally wrote, I think it just won't touch them.
> > 
> > Or is the issue that the find command might remove them and then the
> > indexes don't get fixed up?  I suppose I could just make sure that the
> > find ignores those dirs, but I thought (from other maillist reading)
> > that the next time their client SELECTs the folder it'll fix it up
> > anyways.
> I was more thinking what happens if the user creates a mailbox called `rm -rf /` or something.. Also if there are " or \ characters I think the LIST output will use literals and your parsing will break more or less badly.

That's certainly true.  I guess I was just hoping to skip over those
mailboxes with unpleasant characters for the moment :}

More likely I'll rewrite this more carefully in Perl.

> > I suppose another spin on this would be for me to script the preauth
> > imap client to figure out which mailboxes have messages marked for
> > deletion of such and such an age and then try to use EXPUNGE to wipe
> > just them out.  I'm not sure off hand if that's possible.
> That would be a bit difficult at least to do via IMAP..

So I'm finding.  I guess I was thinking I could find the messages in a
SELECTed mailbox via some parsing of either 
  instead of INTERNALDATE), or
- UID FETCH 1:* (INTERNALDATE X-SAVEDATE FLAGS) as I've seen bantered about, or
- combine the two and SEARCH DELETED, then
  UID FETCH $initial_uid_list (X-SAVEDATE FLAGS) to refine the list.

Then use the (U?)IDs I get back from that to do
- UID EXPUNGE $uid_list

Of course I've only started researching that avenue, so maybe that's not
so reasonable.

I'm starting to see why so much effort has been expended on this front.

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