code: def init_git(
      self,
      repo: "Repo",
      scm: "Git",
      stash_rev: str,
      entry: "ExpStashEntry",
      infofile: Optional[str],
      branch: Optional[str] = None,
  ):
      self.status = TaskStatus.PREPARING
      if infofile:
          self.info.dump_json(infofile)
  
      assert isinstance(self.scm, Git)
  
      with get_exp_rwlock(repo, writes=[EXEC_NAMESPACE]):
          scm.set_ref(EXEC_HEAD, entry.head_rev)
          scm.set_ref(EXEC_MERGE, stash_rev)
          scm.set_ref(EXEC_BASELINE, entry.baseline_rev)
          self._detach_stack.enter_context(
              self.scm.detach_head(
                  self.scm.get_ref(EXEC_HEAD),
                  force=True,
                  client="dvc",
              )
          )
          merge_rev = self.scm.get_ref(EXEC_MERGE)
          self.scm.stash.apply(merge_rev)
          if branch:
              self.scm.set_ref(EXEC_BRANCH, branch, symbolic=True)
          elif scm.get_ref(EXEC_BRANCH):
              self.scm.remove_ref(EXEC_BRANCH)
  
imports: import os
  from contextlib import ExitStack
  from tempfile import mkdtemp
  from typing import TYPE_CHECKING, Optional, Union
  from configobj import ConfigObj
  from funcy import retry
  from shortuuid import uuid
  from dvc.lock import LockError
  from dvc.log import logger
  from dvc.repo.experiments.refs import EXEC_BASELINE, EXEC_BRANCH, EXEC_HEAD, EXEC_MERGE, EXEC_NAMESPACE, TEMP_NAMESPACE
  from dvc.repo.experiments.utils import EXEC_TMP_DIR, get_exp_rwlock
  from dvc.scm import SCM, Git
  from dvc.utils.fs import remove
  from dvc.utils.objects import cached_property
  from .base import BaseExecutor, TaskStatus
label_desc: Use image node_id 3 for calling the WorkspaceExecutor obj's underlying member method code with example usage: obj.init_git(repo, scm, stash_rev, entry, infofile, branch) without return types