code: def fetch(self, path, use_sudo=False, user=None, remote=None):
          
  
          if path is None:
              raise ValueError("Path to the working copy is needed to fetch from a remote repository.")
  
          if remote is not None:
              cmd = 'git fetch %s' % remote
          else:
              cmd = 'git fetch'
  
          with cd(path):
              if use_sudo and user is None:
                  run_as_root(cmd)
              elif use_sudo:
                  sudo(cmd, user=user)
              else:
                  run(cmd)
docs: Fetch changes from the default remote repository.
  
          This will fetch new changesets, but will not update the contents of
          the working tree unless yo do a merge or rebase.
  
          :param path: Path of the working copy directory.  This directory must exist
                       and be a Git working copy with a default remote to fetch from.
          :type path: str
  
          :param use_sudo: If ``True`` execute ``git`` with
                           :func:`fabric.operations.sudo`, else with
                           :func:`fabric.operations.run`.
          :type use_sudo: bool
  
          :param user: If ``use_sudo is True``, run :func:`fabric.operations.sudo`
                       with the given user.  If ``use_sudo is False`` this parameter
                       has no effect.
          :type user: str
  
          :type remote: Fetch this remote or default remote if is None
          :type remote: str