https://blog.csdn.net/Cl2212/article/details/115061640
recursive循环下载子模块，可能因为子模块失败，
git clone --recursive https://github.com/XXX.git重新下载
git submodule update --init --recursive
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https://blog.csdn.net/Cl2212/article/details/115061640
git clone --recursive https://github.com/XXX.gitgit submodule update --init --recursive