From mboxrd@z Thu Jan  1 00:00:00 1970
From: Duy Nguyen <pclouds@gmail.com>
Subject: Re: "fatal: reference is not a tree:" on git checkout <branch>
Date: Fri, 26 Jul 2013 18:46:38 +0700
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To: David Abdurachmanov <david.abd@gmail.com>
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On Fri, Jul 26, 2013 at 4:52 PM, David Abdurachmanov
<david.abd@gmail.com> wrote:
> Hi,
>
> Reproduce:
>
> $ git clone https://github.com/cms-sw/cmsdist.git
> $ git branch -a | grep devel-gcc48
> remotes/origin/IB/CMSSW_7_0_X/devel-gcc48
> $ git checkout IB/CMSSW_7_0_X/devel-gcc48
> fatal: reference is not a tree: IB/CMSSW_7_0_X/devel-gcc48
>
> It has stopped to work with the last pull request. All the references on Google
> talk about submodules, which I don't use. Any ideas what could be causing this
> issue?

"Bad" naming. It interprets the branch name as something-gHEX like the
output from git-describe. Coincidently "cc48" is an umambiguous short
sha-1. check_tracking_name, which prefix "origin/" in, never has a
chance to run.

We should probably check in get_describe_name() that the returned
value is a commit or a tag, but that doesn't really solve the problem.
I think check_tracking_name should have higher priority than
get_describe_name()..
-- 
Duy