From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jonathan Nieder <jrnieder@gmail.com>
Subject: Re: Splitting a repository but sharing the common parts of the
 object database
Date: Mon, 13 Dec 2010 13:20:53 -0600
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To: Phillip Susi <psusi@cfl.rr.com>
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Hi Phillip,

Phillip Susi wrote:

> If I run a repack -a, then the new project has everything copied out of
> the archive and into its new main pack, rather than continuing to use
> the archive repository for old history, and just pack everything since
> then.  I guess I am looking for is somewhere between a full repack and
> an incremental; a way to make repack -a discard existing local packs,
> but to respect the alternate packs and omit objects they contain from
> the new local pack.

You might be interested in girocco's fork support.  See
http://repo.or.cz/w/girocco.git/blob/HEAD:/jobd/gc.sh for starters.

(Yes, the short answer is "-l" but showing where I got that answer
from seems a little easier. :))