Removing a mailbox with a very long name

[David Mayo]

Can someone suggest the best way of deleting a mailbox that has gotten 
too long?

This one is stopping our daily "quota fix" command from running:

Nov 24 06:40:07 imap.bath.ac.uk quota[12707]: [ID 240394 mail.error] 
IOERROR: opening quota file 
/opt/etc/imapd/quota/a/user.abc20.INBOX.INBOX.INBOX.INBOX.INBOX.toINBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.Deleted 
Messages: File name too long
Nov 24 06:40:07 imap.bath.ac.uk quota[12707]: [ID 335833 mail.error] 
DBERROR: error fetching 
user.abc20.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.Deleted 
Messages: cyrusdb error
Nov 24 06:40:07 imap.bath.ac.uk quota[12707]: [ID 857756 mail.notice] 
skiplist: unlock while not locked
Nov 24 06:40:07 imap.bath.ac.uk quota[12707]: [ID 809228 mail.error] 
failed building quota list for '*': System I/O error: Bad file number

I have managed to delete all the parent folders, but not this one.

cyradm won't even let me enter a mailbox name this long, but I can use a 
"*" which LISTs and DELETEs all the mailboxes apart from this one.

cyradm output:

imap.bath.ac.uk> dm "user.abc20.INBOX.*"
Deleting mailbox 
user.abc20.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.Deleted 
Messages...Invalid mailbox name

And IMAP telemetry log:

<1290605708<9 RLIST "" "user.abc20.INBOX.*"
 >1290605708>* LIST (\HasNoChildren) "." 
"user.abc20.INBOX.INBOX.INBOX.INBOX.INBO
X.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.
INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.IN
BOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBO
X.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.
INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.IN
BOX.INBOX.INBOX.INBOX.Deleted Messages"
9 OK Completed (0.000 secs 2 calls)
<1290605708<10 DELETE 
"user.abc20.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBO
X.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.
INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.IN
BOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBO
X.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.
INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.INBOX.IN
BOX.Deleted Messages"
 >1290605708>10 NO Invalid mailbox name

My "cyrus" user has "create" permissions on the mailbox, so it's not an 
ACL issue.

I have removed the mailbox from the filesystem and run a reconstruct, 
but this (predictably) just recreates the folder on the filesystem.

We're running Cyrus 2.3.13.

Regards,


Dave.

David Mayo
Networks/Systems Administrator
University of Bath Computing Services, UK