Re: [9fans] upas/fs to imap: removed messages sometimes regenerate

[erik quanstrom <quanstro@quanstro.net>]

> I'm seeing some odd (wrong) behavior with Plan 9's upas/fs and was
> wondering of others have seen it, before I start digging further. I
> use upas/fs to talk to a local mailbox and two IMAP servers. The local
> store and one of the IMAP servers work reliably correctly. On the
> other IMAP server, upas/fs will *sometimes* get into a state where
> when I remove a message, it'll re-insert itself into the tree with a
> higher message number. For example, with the IMAP server dalet:
>
> :; cd /mail/fs/dalet
> :; ls
> 1
> 2
> ctl
> :; rm 1 2 ; ls
> 3
> 4
> ctl
>
> Messages 3&4 are the same as 1&2; nothing new's actually come in.
> Other IMAP clients I've used behave properly with this server. I've
> not yet identified the pattern which causes it, but it's not random.
> Anyone else seen this or similar?

i've seen this before.  the problem was the client and server had lost
uid sync.  if you know a situation that always produces the behavior
it would be interesting to telnet directly to the server and snoop on
the uids.
	1 login $user $password
	2 select inbox
	3 status inbox (messages uidvalidity)
	4 uid fetch 1:* uid
<delete messages the normal way.  upas/fs uses "uid store %uld +flags (\Deleted)"
and then "expunge">
	5 uid fetch 1:* uid
will list all the available messages.  if you list the uids, delete messages
in a way that causes a problem, then you can list the uids again and
see if upas/fs or the server is at fault.

- erik