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From: Junio C Hamano <gitster@pobox.com>
Subject: Re: Mergetool generating blank files (1.5.3)
Date: Thu, 27 Sep 2007 12:58:30 -0700
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Cc: "Pierre Habouzit" <madcoder@debian.org>, git@vger.kernel.org
To: "Kelvie Wong" <kelvie@ieee.org>
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"Kelvie Wong" <kelvie@ieee.org> writes:

> I've tried all of the ones that were supported, the result is the same
> -- blank files in all three windows.
>
> It is because git mergetool fails to generate these files for whatever
> reason (the filebasename.{REMOTE,LOCAL,BASE}.* files).  I don't know
> why this happens.

Can you run git-mergetool under "sh -x"?

That is,

	$ sh -x git-mergetool

around ll.160-170 these files are created.