code: def last_commit(self) -> Any:
      if self._commit:
          return self._commit
      if not self.repo:
          return None
      if not self.repo.head or not self.repo.head.is_valid():
          return None
      # TODO: Saw a user getting a Unicode decode error when parsing refs,
      # more details on implementing a real fix in [WB-4064]
      try:
          if len(self.repo.refs) > 0:
              return self.repo.head.commit.hexsha
          else:
              return self.repo.git.show_ref("--head").split(" ")[0]
      except Exception:
          logger.exception("Unable to find most recent commit in git")
          return None
  
imports: import configparser
  import logging
  import os
  from typing import TYPE_CHECKING, Any, Optional
  from urllib.parse import urlparse, urlunparse
  import wandb
label_desc: Use image node_id 10 for calling the GitRepo obj's underlying member method code with example usage: obj.last_commit() and returns: self, None, None, self, self, None