def fs_chmod(mode, file = '/')
      FileUtils.chmod_R(mode, File.join(self.git_dir, file))
    end
def fs_chmod(mode, file = '/')
      FileUtils.chmod_R(mode, File.join(self.git_dir, file))
    end
Chmod the the file or dir and everything beneath
   +file+ is the relative path from the Git dir

 Returns nothing