Git单独checkout子目录

http://schacon.github.io/git/git-read-tree.html#_sparse_checkout

Existing Repository

If you already have a repository, simply enable and configure sparse-checkout as above and do git read-tree.

1. Enable sparse-checkout:

   git config core.sparsecheckout true

2. Configure sparse-checkout by listing your desired sub-trees in .git/info/sparse-checkout:

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

3. Update your working tree:

   git read-tree -mu HEAD

可以略过第二步

1.   git config core.sparsecheckout true

2   Update your working tree:

git read-tree -mu HEAD

3

git checkout [branch] -- fileName