From mboxrd@z Thu Jan  1 00:00:00 1970
From: Marc Strapetz <marc.strapetz@syntevo.com>
Subject: git submodule should honor "-c credential.helper" command line
 argument
Date: Tue, 2 Feb 2016 18:13:14 +0100
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git -c credential.helper=helper submodule update --init submodule

does not invoke "helper", but falls back to the default strategies.
When configuring in ~/.gitconfig:

[credential]
   helper=helper

git submodule update --init submodule

works fine. This behavior is somewhat unexpected -- is this a bug or by 
intention? In case intention, what's the recommended way to "inject" 
credentials helpers to work on submodules without modifying Git's config 
files?

Tested with Git 2.5.0 (Windows).

-Marc