From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Peter Harris" <git@peter.is-a-geek.org>
Subject: Re: Can someone confirm what the contents of refs/heads/master means?
Date: Mon, 8 Dec 2008 14:55:27 -0500
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To: "David Copeland" <davetron5000@gmail.com>
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On Mon, Dec 8, 2008 at 2:42 PM, David Copeland wrote:
> Thanks for the info :)
>
> The reason I edited by hand is when I was on trunk (e.g. git checkout
> trunk), I did a git svn dcommit and it worked, but said "you aren't on
> a branch", so I was concerned I might be in some weird state (i.e. if
> trunk isn't a branch, can I make a branch off of it?)

Trunk is a "remote branch", so you can't check it out. If you try, you
get what is called a "detached HEAD".

http://www.kernel.org/pub/software/scm/git/docs/user-manual.html#detached-head

And, yes, you can make a local branch off of a remote branch.

Peter Harris