From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Jeff Whiteside" <jeff.m.whiteside@gmail.com>
Subject: get upstream branch
Date: Mon, 8 Dec 2008 20:52:03 -0800
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Hi,

Does anyone know how to programmatically get the upstream/parent
branch of a branch?  I'm trying to write a gui, but looking at gitk's
tcl code isn't helping me much.

Thanks,

Whiteside