dovecot - Aug 2007 - courier-dovecot-migrate.pl destroyed my indices... still recovering...

I tried to disable courier-pop3 today in favour of dovecot pop3.
Prior to that I ran:

find /home -maxdepth 1 -type d  | xargs --replace
/usr/local/scripts/courier-dovecot-migrate.pl --overwrite --recursive --convert
{}

( /home is hashed two levels deep: /home/a/a/aanton/Maildir/ )

After that, I got lots of errors like:

Aug  9 13:02:40 postamt dovecot: IMAP(azenclu): Maildir
/home/a/z/azenclu/Maildir sync: UIDVALIDITY changed (1167827929 ->
1058881980)
Aug  9 13:03:46 postamt dovecot: POP3(bbuhse): Couldn't init INBOX: BUG:
Unknown internal error
Aug  9 13:03:46 postamt dovecot: POP3(bbuhse): Mailbox init failed top=0/0,
retr=0/0, del=0/0, size=0
Aug  9 13:04:14 postamt dovecot: IMAP(bkusma): Maildir /home/b/k/bkusma/Maildir
sync: UIDVALIDITY changed (1179153053 -> 1174292827)
Aug  9 13:04:19 postamt dovecot: IMAP(am02): Corrupted index cache file
/home/a/m/am02/Maildir/dovecot.index.cache: indexid changed
Aug  9 13:04:28 postamt deliver(avolz): Corrupted index cache file
/home/a/v/avolz/Maildir/dovecot.index.cache: indexid changed
Aug  9 13:04:51 postamt dovecot: IMAP(ck05): Maildir /home/c/k/ck05/Maildir
sync: UIDVALIDITY changed (1167893115 -> 1094733247)
Aug  9 13:05:11 postamt deliver(agundlfi): Corrupted index cache file
/home/a/g/agundlfi/Maildir/dovecot.index.cache: indexid changed
Aug  9 13:05:50 postamt dovecot: IMAP(asorigue): Corrupted index cache file
/home/a/s/asorigue/Maildir/dovecot.index.cache: indexid changed
Aug  9 13:06:04 postamt dovecot: IMAP(azenclu): Corrupted index cache file
/home/a/z/azenclu/Maildir/dovecot.index.cache: indexid changed
Aug  9 13:06:08 postamt dovecot: IMAP(coneck): Maildir /home/c/o/coneck/Maildir
sync: UIDVALIDITY changed (1164189070 -> 1058892719)

Dovecot would recover from that (deliver would deliver the mail on the
next queue run) -- but why is that?
-- 
Ralf Hildebrandt (Ralf.Hildebrandt at charite.de)             plonk at
charite.de
Postfix - Einrichtung, Betrieb und Wartung       Tel. +49 (0)30-450 570-155
http://www.arschkrebs.de
This message represents the official view of the voices in my head

On Thu, 2007-08-09 at 15:19 +0200, Ralf Hildebrandt
wrote:
> I tried to disable courier-pop3 today in favour of dovecot pop3.
> Prior to that I ran:
> 
> find /home -maxdepth 1 -type d  | xargs --replace
/usr/local/scripts/courier-dovecot-migrate.pl --overwrite --recursive --convert
{}
> 
> ( /home is hashed two levels deep: /home/a/a/aanton/Maildir/ )
> 
> After that, I got lots of errors like:
> 
> Aug  9 13:02:40 postamt dovecot: IMAP(azenclu): Maildir
/home/a/z/azenclu/Maildir sync: UIDVALIDITY changed (1167827929 ->
1058881980)
..

If you had run Dovecot as IMAP server, then it wasn't such a great idea
to run the migration, because it recreates dovecot-uidlist files trying
to make them compatible with Courier's POP3 uidlist file.

Creating dovecot-uidlist then caused the UIDVALIDITY to change, which
causes IMAP clients to redownload all messages, and as you can see
Dovecot doesn't handle UIDVALIDITY changes all that nicely. v1.1 does a
better job with it though.

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* Timo Sirainen <tss at iki.fi>:
> If you had run Dovecot as IMAP server, then it wasn't such a great idea
> to run the migration, because it recreates dovecot-uidlist files trying
> to make them compatible with Courier's POP3 uidlist file.
Oops.
 
> Creating dovecot-uidlist then caused the UIDVALIDITY to change, which
> causes IMAP clients to redownload all messages, and as you can see
> Dovecot doesn't handle UIDVALIDITY changes all that nicely. v1.1 does a
> better job with it though.
So, is there a way to migrate WITHOUT all my pop3 users re-downloading
everything?

-- 
Ralf Hildebrandt (Ralf.Hildebrandt at charite.de)             plonk at
charite.de
Postfix - Einrichtung, Betrieb und Wartung       Tel. +49 (0)30-450 570-155
http://www.arschkrebs.de
Now that we know Microsoft's plan for world domination isn't superman
suppost to come out and kick some ass?