docs: def compare(self, path, prefixed_path, source_storage):
          """
          Returns True if the file should be copied.
          """
          # First try a method on the command named compare_<comparison_method>
          # If that doesn't exist, create a comparitor that calls methods on the
          # storage with the name <comparison_method>, passing them the name.
          comparitor = getattr(self, 'compare_%s' % self.comparison_method, None)
          if not comparitor:
              comparitor = self._create_comparitor(self.comparison_method)
          return comparitor(path, prefixed_path, source_storage)