code: def input_file(self, _container):
          
          p = local.path(_container)
          if set_input_container(p, CFG):
              return
  
          p = find_hash(CFG["container"]["known"].value, container)
          if set_input_container(p, CFG):
              return
  
          raise ValueError("The path '{0}' does not exist.".format(p))
docs: Find the input path of a uchroot container.