code: def validate_configuration(self):
          
          super().validate_configuration()
  
          if self.use_registry_name is None:
              raise ArcaMisconfigured("Use registry name setting is required for VagrantBackend")
  
          if not re.match(r"^[a-z]+/[a-zA-Z0-9\-_]+$", self.box):
              raise ArcaMisconfigured("Provided Vagrant box is not valid")
  
          if not re.match(r"^[a-z_]+$", self.provider):
              raise ArcaMisconfigured("Provided Vagrant provider is not valid")
  
          if self.registry_pull_only:
              raise ArcaMisconfigured("Push must be enabled for VagrantBackend")
docs: Runs :meth:`arca.DockerBackend.validate_configuration` and checks extra:
  
          * ``box`` format
          * ``provider`` format
          * ``use_registry_name`` is set and ``registry_pull_only`` is not enabled.