git：checkout部分目录， sparse checkout

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git init <repo>
cd <repo>
git remote add -f origin <url>

This creates an empty repository with your remote. Then do:

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git config core.sparsecheckout true

Now you need to define which files/folders you want to actually check out. This is done by listing them in .git/info/sparse-checkout, eg:

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echo "some/dir/" >> .git/info/sparse-checkout
echo "another/sub/tree" >> .git/info/sparse-checkout

Last but not least, update your empty repo with the state from the remote:

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git pull origin master

• 参考：
  • http://stackoverflow.com/a/13738951/3316529
  • http://jasonkarns.com/blog/subdirectory-checkouts-with-git-sparse-checkout/
  • http://schacon.github.io/git/git-read-tree.html#_sparse_checkout