On Wed, 2011-09-14 at 13:32 +0200, Attila Nagy wrote:
Hello,
I'm looking for the alternative of qmail's chmod -t (sticky bit on the maildir root) for Dovecot. What I'm trying to achieve with this lock:
- Dovecot lmtp should give back a temporary error (so the email will be deferred and re-delivered later)
- all other Dovecot daemons (pop, imap) should work as usual, but should not alter maildir contents (they can modify their own files, like indexes, logs etc)
What is the best way to do this? If there is no such thing currently, would it be hard to implement the sticky bit checking on the root?
dovecot-uidlist.lock basically does this. Dovecot comes with maildirlock utility to properly create it. How long would your locks be? They are assumed stale after 2 minutes if you don't update the mtime. Readers will block and if they're still locked after 2 minutes they'll abort (if mtime has been changed). There's also mail_max_lock_timeout setting that changes this wait (you could e.g. lower it only with lmtp).