How to use repo as repository on Hudson

Question

I work on a project using repo to control over a hundred git repositories and Hudson as continuous integration server. The file structure of the project is like:

./.repo
./a/.git
./b/.git
./b/c/.git 
./b/c/d/.git
... more than a hundred gits

The whole project must be built together, in other words, each git repository cannot be built separately. Is there any way to use Hudson work with repo which manages large number of git?