-/* Return a file mode change operation created from the reference REF_FILE
- Don't affect special permissions, use umask, affect 'x' if any 'x', for
- maximum security
-
- Return MODE_BAD_REFERENCE if REF_FILE can't be accessed */
+/* Return a file mode change operation that sets permissions to match those
+ of REF_FILE. Return MODE_BAD_REFERENCE if REF_FILE can't be accessed. */