From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jeff King <peff@peff.net>
Subject: Re: `.git` symlink makes `git submodule add` fail
Date: Fri, 12 Feb 2016 13:27:33 -0500
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Cc: Junio C Hamano <gitster@pobox.com>, git@vger.kernel.org
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On Fri, Feb 12, 2016 at 10:19:38AM -0800, Junio C Hamano wrote:

> >> Is this a bug, or is the ability to symlink `.git` just a happy coincidence?
> >
> > It has never been supported.
> 
> Oops, hit "send" too early.
> 
> We have support for a "gitdir:" facility that would work even on a
> filesystem that cannot do symlinks (see gitrepository-layout(5)),
> and both the higher-level submodule Porcelain and the more recent
> "worktree" experimental code do use it.

And the way to convince git to make the link for you is with clone's
"--separate-git-dir" option.

-Peff