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From: Junio C Hamano <gitster@pobox.com>
Subject: Re: checkout without touching HEAD
Date: Thu, 27 Dec 2007 14:38:06 -0800
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To: "Martin Langhoff" <martin.langhoff@gmail.com>
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"Martin Langhoff" <martin.langhoff@gmail.com> writes:

> Is there a way to get a 'checkout' of a treeish _directly_ from git to
> an empty (or 'no conflicting paths'-guaranteed) directory, without
> touching HEAD?
>
> Using `git-archive ... | tar -x` is a waste of time and resources -- I
> do want this to be fast for large datasets. I have hacked it a bit by
> backing up HEAD, using git checkout with a temporary index, and then
> restoring HEAD, which I can do because my script has a big fat lock
> around it. But it's very un-gittish to need a big lock around me.

git read-tree -m -u HEAD $treeish