From: Marc Strapetz <marc.strapetz@syntevo.com>
Date: Tue, 02 Feb 2016 17:13:14 GMT
Subject: git submodule should honor "-c credential.helper" command line argument
Message-ID: <56B0E3AA.30804@syntevo.com>

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