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Re: Confused about locking

2009-10-10 11:37:21
* Paul Gardiner <lists(_at_)glidos(_dot_)net> [2009-10-10 11:10 +0100]:
How do you ensure correct locking on maildir folders? I
have three things accessing mine: procmail, mailx and
courier imap. Do they agree on some sort of convention
for locking?

Section MISCELLANEOUS in procmail(1):

"When  delivering  to directories, MH folders, or maildir folders, you
don't need to use lockfiles to prevent several concurrently running
procmail programs from messing up."

Also:
<http://cr.yp.to/proto/maildir.html>

"Two words: no locks. An MUA can read and delete messages while new mail
is being delivered: each message is stored in a separate file with a
unique name, so it isn't affected by operations on other messages. An
MUA doesn't have to worry about partially delivered mail: each message
is safely written to disk in the tmp subdirectory before it is moved to
new. The maildir format is reliable even over NFS."
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