From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jeff King <peff@peff.net>
Subject: Re: Get a git diff without taking index into account
Date: Wed, 18 Feb 2015 17:30:13 -0500
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On Wed, Feb 18, 2015 at 04:38:55PM -0500, Eric Frederich wrote:

> Also, how would I go about detecting untracked files the way status does?
> There is no way to specify a HEAD per git command using switches or
> environment variables.
> I can't change the HEAD of the Git repo because other processes may be
> using it at the same time.

Untracked files are a function of the index, not of the HEAD. So you
would load whatever tree you like into your index (either "the" index,
or a temporary one you specify with GIT_INDEX_FILE), and then "git
ls-files -o".

-Peff