From mboxrd@z Thu Jan  1 00:00:00 1970
From: John Keeping <john@keeping.me.uk>
Subject: Re: git submodule ignores --git-dir
Date: Fri, 11 Sep 2015 16:28:07 +0100
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Cc: Filip Gospodinov <filip.gospodinov@monetas.net>,
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To: Jens Lehmann <Jens.Lehmann@web.de>
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On Fri, Sep 11, 2015 at 05:15:52PM +0200, Jens Lehmann wrote:
> Am 10.09.2015 um 22:06 schrieb Filip Gospodinov:
> > I know that for this particular use case I can just use `git clone --recursive`
> > and that other use cases can be worked around by using `cd`. Still, I wonder if
> > the behavior I discovered is a bug or if it's expected.
> 
> I don't think this is a bug. The git submodule command needs a work tree
> to read the .gitmodules file from, that's while it fails when using
> --git-dir from outside the work tree. But I admit that the error message
> "No submodule mapping found in .gitmodules for path ..." could be improved
> to clearly state that the .gitmodules file wasn't found.
> 
> Unfortunately trying to show git the right work tree:
> 
> $ git --git-dir=$PWD/repo2/.git --work-tree=$PWD/repo2 submodule update --init
> 
> Didn't work as I expected it to either:
> 
> fatal: /home/Sledge/libexec/git-core/git-submodule cannot be used without a working tree.
> 
> So you'll have to cd into the repo for now.

There's also "git -C /path/to/repo" which avoids the need for a separate
"cd".