text: from buildstream import Element
  
  
  # Copies files from the dependent element but inserts split-rules using dynamic data
  class DynamicElement(Element):
  
      BST_MIN_VERSION = "2.0"
  
      def configure(self, node):
          node.validate_keys(["split-rules"])
          self.split_rules = {key: value.as_str_list() for key, value in node.get_mapping("split-rules").items()}
  
      def preflight(self):
          pass
  
      def get_unique_key(self):
          return {"split-rules": self.split_rules}
  
      def configure_sandbox(self, sandbox):
          pass
  
      def stage(self, sandbox):
          with self.timed_activity("Staging artifact", silent_nested=True):
              self.stage_dependency_artifacts(sandbox)
  
      def assemble(self, sandbox):
          bstdata = self.get_public_data("bst")
          bstdata["split-rules"] = self.split_rules
          self.set_public_data("bst", bstdata)
  
          return ""
  
  
  def setup():
      return DynamicElement
  