From mboxrd@z Thu Jan  1 00:00:00 1970
From: Junio C Hamano <gitster@pobox.com>
Subject: Re: Diff-tree does not work for initial commit
Date: Mon, 15 Sep 2008 13:54:42 -0700
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 <48CECA42.1050209@drmicha.warpmail.net>
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Cc: Anatol Pomozov <anatol.pomozov@gmail.com>,
	Git Mailing List <git@vger.kernel.org>
To: Michael J Gruber <git@drmicha.warpmail.net>
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Michael J Gruber <git@drmicha.warpmail.net> writes:

> Anatol Pomozov venit, vidit, dixit 15.09.2008 22:01:
>> Hi, It looks like I found a bug in git.
>> 
>> The problem: In my script I need to know what files were modified by 
>> given commit. I use diff-tree for it. Although it works for most 
>> cases, for initial commit it does not. Here is a sequence of actions.
>> 
>> 
>> anatol:~ $ mkdir mkdir initialcommitissue anatol:~ $ cd
>> initialcommitissue/ anatol:initialcommitissue $ git init Initialized
>> empty Git repository in /home/anatol/initialcommitissue/.git/ 
>> anatol:initialcommitissue $ echo "First commit" > 1.txt 
>> anatol:initialcommitissue $ git add 1.txt anatol:initialcommitissue $
>> git commit -m "First commit" Created initial commit 31ccc6a: First
>> commit 1 files changed, 1 insertions(+), 0 deletions(-) create mode
>> 100644 1.txt anatol:initialcommitissue $ git diff-tree HEAD     <<<<<
>> PROBLEM IS HERE
>
> From the man page:
>
>        Compares the content and mode of the blobs found via two tree
> objects.
>
>        If there is only one <tree-ish> given, the commit is compared
> with its parents (see --stdin below).
>
>        Note that git-diff-tree can use the tree encapsulated in a commit
> object.
>
> The initial commit has no parent, so diff-tree does not know which tree
> to compare to.

--root?