[Dovecot] Dovecot-1.1.15 panics

[Timo Sirainen]

This is the main reason it keeps breaking:

Terminal 1:
while true; do touch foo.tmp; mv foo.tmp foo; done

Termanal 2:
while true; do cat foo; done

foo always exists, because POSIX guarantees that rename is atomic. But
terminal 2 keeps failing randomly:

cat: No such file or directory

So, apparently HFS+'s rename() isn't really atomic after all..
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