Git, pull in part of another repository

Say there are two repositories X and Y with a file structure like below.

X-+
  |- /A
  |- /B
  |- /C

Y-+
  |- /E
  |- /F
  |- /G

I know it'开发者_Go百科s possible to pull X into Y and git will merge the files. Is it possible to pull directory B into directory F of repository Y? I'm guessing it isn't because git doesn't track directories. Is it possible to achieve this with git in some other way?

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You can do this with symlinks and git submodules: http://chrisjean.com/2009/04/20/git-submodules-adding-using-removing-and-updating/

Note you still have to pull in the whole project tree as a submodule so if you are trying to save space, this won't help and you'll need some other solution.

For example (this assumes a *nix system), inside project Y:

mkdir .include
git submodule add git@mygithost:X .include/X
ln -sf .include/X/B F