code: def add_remote(
      self, *, url=None, config=None, name="upstream", default=True
  ):
      self._require("dvc")
  
      assert bool(url) ^ bool(config)
  
      if url:
          config = {"url": url}
  
      with self.dvc.config.edit() as conf:
          conf["remote"][name] = config
          if default:
              conf["core"]["remote"] = name
  
      if hasattr(self, "scm"):
          self.scm.add(self.dvc.config.files["repo"])
          self.scm.commit(f"add '{name}' remote")
  
      return url or config["url"]
  
imports: import os
  import pathlib
  import sys
  from contextlib import contextmanager
  from functools import partialmethod
  from dvc.utils import serialize
label_desc: Use image node_id 15 for calling the TmpDir obj's underlying member method code with example usage: obj.add_remote() and returns: unknown