bug - over system quota and dovecot-uidlist

Timo Sirainen tss at iki.fi
Wed Sep 23 13:19:14 UTC 2015

On 09/23/2015 03:53 PM, krzf83 at gmail.com  wrote:
> Ever since I've migraded from courier pop3 to dovecot pop3 I'm
> constantly getting complains from users that went over system quota
> for short while and then their pop3 client downloads all messages
> again. I never happened with courier pop3. I think that dovecot does
> not handle dovecot-uidlist file safely so it can withstand such
> situations.
> rsync and other similar programs always writes to a copy of the file
> like dovecot-uidlis.xcb453 and on success unlinks old file and renames
> new one. Dovecot should not assume that write operation on
> dovecot-uidlist will succeed.

Dovecot doesn't assume that either. I don't know what exactly the
problem is here, maybe some small mistake or maybe something larger that
can't be fixed, but I'm sure it's not because Dovecot assumes that
writes are succeeding. I don't unfortunately have time to debug it
myself. The main reason why I haven't bothered even trying to support
this use case is that there's no way to handle this 100% correctly and
safely for IMAP (although I suppose you could get away with it working
nearly always, and for POP3 it could be made to work 100% correctly).

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