git submodule update: have a dedicated helper for cloning
This introduces a new helper function in git submodule--helper which takes care of cloning all submodules, which we want to parallelize eventually. Some tests (such as empty URL, update_mode=none) are required in the helper to make the decision for cloning. These checks have been moved into the C function as well (no need to repeat them in the shell script). Reviewed-by: NJonathan Nieder <jrnieder@gmail.com> Signed-off-by: NStefan Beller <sbeller@google.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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