From mboxrd@z Thu Jan  1 00:00:00 1970
From: Junio C Hamano <gitster@pobox.com>
Subject: Re: [PATCH 24/34] checkout: reject if the branch is already checked out elsewhere
Date: Tue, 02 Dec 2014 09:30:22 -0800
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Cc: Mark Levedahl <mlevedahl@gmail.com>,
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To: Duy Nguyen <pclouds@gmail.com>
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	(Duy Nguyen's message of "Tue, 2 Dec 2014 19:01:47 +0700")
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Duy Nguyen <pclouds@gmail.com> writes:

> FWIW git-branch usually can show the original branch of detached head
> (must not always). I don't think we have a plumbing equivalent for it
> though. People can "tail -1 $GIT_DIR/logs/HEAD| sed .." but that seems
> hacky.

@{-1}, i.e. "the last branch I checked out"?

> I do like "read-only" ref concept where we can keep ref name
> (especially tags) in HEAD until the next commit. But it didn't go
> anywhere

Remind me.  That sounds somewhat interesting.