[Dovecot] Couldn't init INBOX: Can't sync mailbox: Messages keep getting expunged

[Timo Sirainen]

I finally figured out what's happening:

v1.0 writes expunges as plain "expunged" records to dovecot.index.log
file. v1.1 treats such records as "expunge requests", while the actual
expunging is done by writing another "expunged (ext)" record.

With v1.1 dovecot.index file isn't always required, because its contents
can be produced by reading dovecot.index.log file, assuming that is the
first generated log file (prev log file sequence=0 in header).

So what happens is that for some reason v1.1 doesn't read dovecot.index
file, but reads dovecot.index.log file and ignores all expunge records.
Maildir new/ and cur/ mtimes are all the same as in index files, so
Dovecot doesn't bother reading the maildir.

I was able to reproduce this by deleting dovecot.index file, but not
without deleting it. So if it exists and you still have this problem, I
don't really know why it wouldn't have read it..

Anyway, this fixes the problem:
http://hg.dovecot.org/dovecot-1.1/rev/b776f2b8d827

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