def get_branch_changed_entries(self, branch_name):
        """Return the name of all changed files within the branch."""
        master_tree = self._get_tree(self.get_branch('master'))
        branch_tree = self._get_tree(self.get_branch(branch_name))
        return tree_changes(
            self._repo.object_store, branch_tree.id, master_tree.id)
Return the name of all changed files within the branch.
portia_server/storage/repoman.py