dovecot - Apr 2014 - zlib maildir reindex broken

I posted to the list about this a while ago but never got a response, I have a
bit more information now.

Dovecot 2.2.12 and other 2.2 versions are broken when using zlib and maildir. 
If messages are re-indexed, the INTERNALDATE of all messages is set to the time
the re-index is done.
  
The problem seems to be in src/plugins/zlib/zlib-plugin.c in the function
zlib_mail_cache_open.

During a reindex maildir_mail_get_received_date() does an i_stream_stat on the
the i_stream_seekable stream created in zlib_mail_cache_open, but this istream
does not know about the original maildir message file and always returns the
current time for the file's stat times.

This is also broken on initial index, but if mail is indexed when it's
received (ours isn't) it coincidentally gets the right time.

On 24.4.2014, at 0.51, Richard Platel <rplatel at tucows.com> wrote:
> I posted to the list about this a while ago but never got a response, I
have a bit more information now.
> 
> Dovecot 2.2.12 and other 2.2 versions are broken when using zlib and
maildir.  If messages are re-indexed, the INTERNALDATE of all messages is set to
the time the re-index is done.
> 
> The problem seems to be in src/plugins/zlib/zlib-plugin.c in the function
zlib_mail_cache_open.
> 
> During a reindex maildir_mail_get_received_date() does an i_stream_stat on
the the i_stream_seekable stream created in zlib_mail_cache_open, but this
istream does not know about the original maildir message file and always returns
the current time for the file's stat times.
> 
> This is also broken on initial index, but if mail is indexed when it's
received (ours isn't) it coincidentally gets the right time.
Thanks, fixed: http://hg.dovecot.org/dovecot-2.2/rev/9f1460682295