code: def save(self):
      rev = self.fs.repo.get_rev()
      if self.def_repo.get(self.PARAM_REV_LOCK) is None:
          self.def_repo[self.PARAM_REV_LOCK] = rev
  
file_path: dvc/dvc/dependency/repo.py
imports: from copy import deepcopy
  from typing import TYPE_CHECKING, Any, Dict, Optional, Union
  import voluptuous
  from dvc.utils import as_posix
  from .base import Dependency
label_desc: Use image node_id 7 for calling the RepoDependency obj's underlying member method code with example usage: obj.save() without return types