From mboxrd@z Thu Jan  1 00:00:00 1970
From: Kevin Daudt <me@ikke.info>
Subject: Re: git diff HEAD^(255) fails
Date: Tue, 23 Feb 2016 21:58:07 +0100
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To: Ole Tange <ole@tange.dk>
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On Sat, Feb 06, 2016 at 10:56:46PM +0100, Ole Tange wrote:
> git diff first looks for a file, then looks if it is a reference to a
> revision. If the file fails due to being too long, the diff fails:
> 
> $ git init
> $ git diff 'HEAD^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^'
> HEAD
> fatal: failed to stat
> 'HEAD^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^':
> File name too long
> 
> If file name too long it should just try to see if it is a reference
> to a revision.
> 

Is there a reason you are repeating 255 "^" instead of using HEAD~255?