code: def chdir(self, target_directory):
          
          target_directory = self.filesystem.resolve_path(
              target_directory, allow_fd=True)
          self.filesystem.confirmdir(target_directory)
          directory = self.filesystem.resolve(target_directory)
          # A full implementation would check permissions all the way
          # up the tree.
          if not is_root() and not directory.st_mode | PERM_EXE:
              self.filesystem.raise_os_error(errno.EACCES, directory)
          self.filesystem.cwd = target_directory
docs: Change current working directory to target directory.
  
          Args:
              target_directory: The path to new current working directory.
  
          Raises:
              OSError: if user lacks permission to enter the argument directory
                  or if the target is not a directory.