[Dovecot] dsync, hard-links and refcounts

Hi,

when creating a copy of a mail, dovecot provides a feature that will store its contents only once. In maildir, this is done by means of hard links, while mdbox has some special refcounting mechanism.

My question is, how can we convert mails from maildir to mdbox without duplicating these copies? It seems that dsync does not detect the hard links. Even if the hard-linked mails have the same GUID listed in dovecot-uidlist, dsync creates multiple instances of the text.

• Is there some way to make dsync notice the hard links? (I used dovecot 2.0.17)
• Alternatively, is there some tool to deduplicate the mdbox after it has been converted from maildir?
• NB: I am not talking about single-instance storage for attachments.

Thank you very much, Christoph

-- Christoph Bußenius Rechnerbetriebsgruppe der Fakultäten Informatik und Mathematik Technische Universität München +49 89-289-18519 <> Raum 00.05.055 <> Boltzmannstr. 3 <> Garching