you have to inform the submodule about its actual commit to retrieve the data from

by using the ``set_parent_commit(...)`` method.

Additionally, GitPython adds functionality to track a specific branch, instead of just a commit. Supported by customized update methods, you are able to automatically update submodules to the latest revision available in the remote repository, as well as to keep track of changes and movements of these submodules. To use it, set the name of the branch you want to track to the ``submodule.$name.branch`` option of the *.gitmodules* file, and use GitPython update methods on the resulting repository with the ``to_latest_revision`` parameter turned on. In the latter case, the sha of your submodule will be ignored, instead a local tracking branch will be updated to the respective remote branch automatically, provided there are no local changes. The resulting behaviour is much like the one of svn::externals, which can be useful in times.

There is more functionality in there, like the ability to archive repositories, get stats and logs, blame, and probably a few other things that were not mentioned here.

Check the unit tests for an in-depth introduction on how each function is supposed to be used.

class RootModule(Submodule):

__slots__ = ()