[Dovecot] Size detection/replair does not work with zlib

[Frerich Raabe]

On 2013-12-12 12:47, Roland Rosenfeld wrote:
> Hi!
>
> Usually dovecot auto detects or repairs the size of a maildir
> message.  So I can place a message named "foo" in the cur directory
> and dovecot uses it.
>
> Now I tried the same with a zlib compressed message but here dovecot
> doesn't recognize/repair the size of the message.
>
> When I access this folder via IMAP the connection is diconnected and
> in dovecot logs I see the following error messages:

[..]

> Error: Cached message size smaller than expected (805 < 2666)
> Error: Maildir filename has wrong S value, renamed the file from
> /somedir/cur/1386772057.M152553P9709.host,S=805:2, to
> /somedir/cur/1386772057.M152553P9709.host,S=805:2,
>
> So here dovecot detects the wrong S value, but instead of fixing it 
> by
> using the uncompressed size, it renames to the same file name as
> before...

I observed exactly the same issue ever since I enabled the zlib
plugin on our IMAP server, running dovecot 2.1.7.

For what it's worth, I wrote a small shell script which, given a
Maildir directory, looks for all files for which the S= value doesn't
match the effective file size (i.e. for zlib-compressed files,
the S= value should match the *uncompressed* file size, for
plain files the S= value should match the physical file sie). The
script the attempts to print appropriate 'mv' commands for renaming
the files as needed. Maybe it helps, I attached it to this mail.


-- 
Frerich Raabe - raabe at froglogic.com
www.froglogic.com - Multi-Platform GUI Testing
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