Fixing stale entries in 'mailboxes.db'...

[Sebastian Hagedorn]

--On 18. März 2019 um 11:21:12 +0000 Karl Pielorz <kpielorz_lst at tdx.co.uk> 
wrote:

> We're running Cyrus IMAP 2.5.12 under FreeBSD.
>
> While 'spring cleaning' one of our IMAP servers - aside from having to
> reconstruct a mailbox, I also found in 'mailboxes.db' (seen via
> 'ctl_mboxlist -d') we have some entries that have no corresponding
> directories on the disk, e.g.
>
>   user.kpielorz.Archive.1-OldLogs    16 (null)
>
> This doesn't appear to be causing an issue - but I can't see a way to
> remove them.
>
> e.g. If I use 'cyradm' to "cm" that mailbox, and then log in with an IMAP
> client - and delete it, the client correctly deletes it - and it goes
> from the shown hierarchy.
>
> If I then expire the deleted folder with 'cyr_expire -D0 -p
> DELETED.user.kpielorz' - I can see it's "really been" deleted in syslog
> [and from the 'DELETED' IMAP folder] - but the entry in mailboxes.db
> persists.
>
> Is there any way of removing these? - Are they OK to leave behind?
>
> I don't really want to have to dump / re-load mailboxes.db - there's
> entries in that "16   (null)" state from a long time ago - they seem to
> be getting 'left behind' when folders are deleted / expired? Some seem to
> be very, very old (so it doesn't appear they'll timeout and disappear or
> anything).
>
> Anyone seem similar, or know what can be done with them?

I believe those are "tombstone entries" to mark folders that previously 
existed and are are safe to keep around.
-- 
    .:.Sebastian Hagedorn - Weyertal 121 (Gebäude 133), Zimmer 2.02.:.
                 .:.Regionales Rechenzentrum (RRZK).:.
   .:.Universität zu Köln / Cologne University - ✆ +49-221-470-89578.:.
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