From mboxrd@z Thu Jan  1 00:00:00 1970
From: Junio C Hamano <junkio@cox.net>
Subject: Re: How do I quickly check what heads a particular commit is in?
Date: Sun, 23 Apr 2006 21:40:12 -0700
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To: "Martin Langhoff" <martin.langhoff@gmail.com>
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"Martin Langhoff" <martin.langhoff@gmail.com> writes:

> In the middle of a merge of 2 of a bunch of closely related heads, I
> found a few odd things, so I've pickaxe'd and found the (potentially
> bogus) commits. I am using gitk, and while I do find the commit, it's
> not very clear what heads have the dodgy commit. They've probably been
> for a few months in there <sigh>.
>
> Is there a practical way to ask in what heads they are?

git merge-base $broken_commit "master"

would show $broken_commit if "master" is a fast-forward of
$broken_commit (i.e. "master" is a descendant).  I think that is
what you are calling "$broken_commit is in master".