From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jens Lehmann <Jens.Lehmann@web.de>
Subject: Re: git clone submodules recursive and reference
Date: Fri, 20 Apr 2012 20:59:54 +0200
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To: Samuel Maftoul <samuel.maftoul@gmail.com>
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Am 20.04.2012 17:12, schrieb Samuel Maftoul:
> Hello,
> 
> I'm using git clone --reference, it works like a charm !
> 
> Now, I have submodules, so I call git clone with both --recursive and
> --reference, works only for the repo itself, submodules are being
> cloned without the "--reference" option.
> 
> With GIT_TRACE=1 I can see this for the initial repo:
> 
> trace: built-in: git 'clone' '--recursive' '--reference' [...]
> 
> And this for the submodules:
> 
> trace: built-in: git 'clone' '-n' [...]
> 
> for every submodules.
> 
> Is this an intended behavior ?

Hmm, to me it looks like passing the --reference option to the clone
run in the submodules doesn't make much sense, as that would make
all submodules and the superproject use the same alternates. And as
far as I know sharing objects between different repositories is not
supported.

> How can I force the clones for submodules to be executed with the
> --reference option ?

You'd have to use "git clone" without the --recursive option and
then do a "git submodule update --init --reference ...".