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由 Heiko Voigt 提交于
By passing the path to a submodule in opt->submodule, the function can be used to walk history in the named submodule repository, instead of the toplevel repository. Signed-off-by: NHeiko Voigt <hvoigt@hvoigt.net> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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