[Dovecot] Compressed maildir

[Timo Sirainen]

On 17.6.2005, at 02:50, Curtis Maloney wrote:

> Xavier Beaudouin wrote:
>> Well i the "compressed" maildir system can add a check to see if file 
>> is >
>> to FS block size... then try to compress it..
>
> In my original post I suggested a cron job compress the files, so it's 
> easy to vary which files get compressed, and when.  Something like 
> (untested, and pre-coffee):
>
> find $MAILPATH ! -name "*.gz" -type f -atime +90 -size +1 -exec 
> /usr/bin/gzip -9 {} ";"

The filename shouldn't change or Dovecot treats it as a new maildir 
file. The safest way would be something like:

touch dovecot-uidlist.lock
gzip -9 cur/$name > tmp/$name
mv tmp/$name cur/$name
rm dovecot-uidlist.lock

The uidlist lock is needed so that filenames aren't renamed while 
compressing. Otherwise you could end up with two same basenames, one 
compressed and one uncompressed. That won't work very nicely.

>> And IMHO I think it should be a good idea to add/merge the patch into 
>> main
>> stream code (with a flag to allow compressed maildir)...
>
> I certainly wouldn't object, and it sounds like Andrey and others like 
> the idea, too.

It's getting a bit difficult to decide what are plugins and what are 
not :)

Plugins wouldn't necessarily have to be even dynamically loadable. It 
could be possible to just have some plugins/builtin/ directory and 
Dovecot would compile everything in it inside the binary.
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