Fábio M. Catunda wrote:
Charles Marcus escreveu:
On 9/26/2007, Bill Landry (bill@inetmsg.com) wrote:
But with maildrop you still run the process of creating/checking on every delivery, same thing as dovecot, right?
Correct. If the folder does not exist, maildrop will create it on first delivery. If the end user deletes the folder, maildrop will recreate the folder on the next message delivery to that account.
Could it could be written to simply create the folder if the target folder doesn't exist (ie, if the initial save fails due to non-existent folder)? Then there would be no performance hit...
There will be a performance hit couse you have to check if the folder exists or not.
Charles did not say you need to check if the folder exists or not.
With maildrop its pretty easy to do that, but you will have an extra access to your HD on every message delivery. Maildrop can run shell commands it the user that runs it have a valid shell (Debian-exim do NOT have a valid shell, I created another user just to make the delivery), so, you can run something like
/^Envelope-to:.*/ getaddr($MATCH) =~ /^.*/; DEST = $MATCH USER =
/bin/echo $DEST | /usr/bin/cut -f1 -d'@'DOMAIN =/bin/echo $DEST | /usr/bin/cut -f2 -d'@'DOEXIST=
[ -d /var/mail/$DOMAIN/$USER/Maildir ]; echo $?if ($DOEXIST == 1){ <RUN SOMETHING HERE TO CREATE MAILDIRS> }
Thats it!
There's a pattern here. instead of
if (file|dir) (exists|is writable) ... write to ...use
write to ...
if (error) handle itThis has multiple benefits:
- optimized for the common case
- less vulnerable to race conditions (things happen between the time you check and the time you do).
- if the file/dir exists/writable, no check to do.
with maildrop, this is done with exceptions (otherwise trying to deliver would result in an error reported to the MTA).
# try writing
exception {
TO $folder
}
# failed. maybe folder doesn't exist. try creating it
# add whatever checks or actins inside this...
$maildirmake $folder
# try writing again
TO $folder
you can adapat this to delivering spam to the Inbox if the user has deleted his Junk folder (a method to opt-out).