docs: def pull_from_origin(repo_path):
      """Execute 'git pull' at the provided repo_path."""
      LOG.info("Pulling from origin at %s." % repo_path)
      command = GIT_PULL_CMD.format(repo_path)
      resp = envoy.run(command)
      if resp.status_code != 0:
          LOG.exception("Pull failed.")
          raise GitException(resp.std_err)
      else:
          LOG.info("Pull successful.")