From mboxrd@z Thu Jan  1 00:00:00 1970
From: Junio C Hamano <junkio@cox.net>
Subject: Re: [PATCH] Shallow clone: low level machinery.
Date: Tue, 31 Jan 2006 10:22:22 -0800
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To: Johannes Schindelin <Johannes.Schindelin@gmx.de>
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Johannes Schindelin <Johannes.Schindelin@gmx.de> writes:

> Worse, you cannot pull from older servers into shallow repos.

"have X" means different thing if you do not have matching
grafts information, so I suspect that is fundamentally
unsolvable.

I am not sure you can convince "git-rev-list ^A" to mean "not at
A but things before that is still interesting", especially when
you give many other heads to start traversing from, but if you
can, then you can do things at rev-list command line parameter
level without doing the "exchange and use the same grafts"
trickery.  That _might_ be easier to implement but I do not see
an obvious correctness guarantee in the approach.

Implementation bugs aside, it is obvious the things _would_ work 
correctly with "exchange and use the same grafts" approach.