docs: def open_tls_file(file_path, mode, private=True):
      """Context to ensure correct file permissions for certs and directories
  
      Ensures:
          - A containing directory with appropriate permissions
          - Correct file permissions based on what the file is (0o600 for keys
          and 0o644 for certs)
      """
  
      containing_dir = os.path.dirname(file_path)
      fh = None
      try:
          if 'w' in mode:
              os.chmod(containing_dir, mode=0o755)
          fh = open(file_path, mode)
      except OSError as e:
          if 'w' in mode:
              os.makedirs(containing_dir, mode=0o755, exist_ok=True)
              os.chmod(containing_dir, mode=0o755)
              fh = open(file_path, 'w')
          else:
              raise
      yield fh
      mode = 0o600 if private else 0o644
      os.chmod(file_path, mode=mode)
      fh.close()