class_docstr: File-based Code Driver handles source control management for the project with files
      
class_docstr_tok: ["File-based","Code","Driver","handles","source","control","management","for","the","project","with","files"]
docstr: Removes the commit hash file, but not the file references
  
  Raises
  ------
  CodeNotInitialized
      error if not initialized (must initialize first)
docstr_tok: ["Removes","the","commit","hash","file",",","but","not","the","file","references","Raises","--","--","--","CodeNotInitialized","error","if","not","initialized","(","must","initialize","first",")"]
code: def delete_ref(self, commit_id):
      """Removes the commit hash file, but not the file references
  
      Raises
      ------
      CodeNotInitialized
          error if not initialized (must initialize first)
      """
      if not self.is_initialized:
          raise CodeNotInitialized()
      if not self.exists_ref(commit_id):
          raise FileIOError(
              __("error", "controller.code.driver.file.delete_ref")
          )
      commit_filepath = os.path.join(self._code_filepath, commit_id)
      os.remove(commit_filepath)
      return True
  
imports: import os
  import shutil
  import errno
  import pathspec
  import tempfile
  import hashlib
  import checksumdir
  from datmo.core.util.misc_functions import list_all_filepaths
  from datmo.core.util.i18n import get
  from datmo.core.util.exceptions import PathDoesNotExist, FileIOError, UnstagedChanges, CodeNotInitialized, CommitDoesNotExist
  from datmo.core.controller.code.driver import CodeDriver
label_desc: Use image node_id 14 for calling the FileCodeDriver obj's underlying member method code with example usage: obj.delete_ref(commit_id) and returns: True