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From: Nicolas Pitre <nico@cam.org>
Subject: Re: Corrupt pack file using older versions of git on a newer repo..
Date: Wed, 20 Dec 2006 10:30:52 -0500 (EST)
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To: Sean <seanlkml@sympatico.ca>
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On Wed, 20 Dec 2006, Sean wrote:

> 
> This is probably expected behavior, but when bisecting another Git
> issue[1], i found that after a fresh clone of the git repository using
> 1.4.4.2 I got the following corrupt pack file when accessing that repo
> with an old version of git:
> 
> $ git --version
> git version 1.4.2
> 
> $ git log
> fatal: corrupted pack file .git/objects/pack/pack-d75f6a8307f8d8ce9727fe27107486839c54aef6.pack

To make that repository accessible with older git versions simply run 
git-repack -a -d using version 1.4.4.2.

The clone with version 1.4.4.2 added OBJ_OFS_DELTA objects to the pack 
which older git versions don't know about.  Those objects are used for 
pack transport when both ends know about them as they take less space.  
But the repack doesn't use them by default so a full repack will get rid 
of them automatically.