def __missing__(self, key):
        if self.default_factory is None:
            raise KeyError(key)
        else:
            ret = self[key] = self.default_factory(name=key)
            return ret
def getProvides(self):
		"""Fetch a spec file from pkgdb and get provides from all its [sub]packages"""
		if self.sp_obj == None:
			return {}

		return self.sp_obj.getProvides()