New script to check or update config-options-current.txt

This script may be generalized to check other files that need lists of
current options. But for now, the script just checks
`scripts/data_files/config-options-current.txt`.

This script is identical to the file in crypto. If the file grows to support
multiple targets, we'll probably want to split it, with a generic part in
the framework and a project-specific part (probably little more than the
list of targets) in each project. But for now the file is too simple to split.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>

tests/scripts/check_option_lists.py

@@ -0,0 +1,42 @@
+#!/usr/bin/env python3
+
+"""
+Check that files with lists of config options are up-to-date, or update them.
+
+This script checks the following file:
+scripts/data_files/config-options-current.txt
+"""
+
+# Copyright The Mbed TLS Contributors
+# SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
+
+import argparse
+import sys
+
+import scripts_path # pylint: disable=unused-import
+from mbedtls_framework import config_macros
+
+
+def main():
+    parser = argparse.ArgumentParser(description=__doc__)
+    # For now this script only acts on one target file.
+    # If we check/update more files, we should add a way to select which
+    # file(s) to operate on.
+    parser.add_argument('--always-update', '-U',
+                        action='store_true',
+                        help=('Update target files unconditionally '
+                              '(overrides --update)'))
+    parser.add_argument('--update', '-u',
+                        action='store_true',
+                        help='Update target files if needed')
+    args = parser.parse_args()
+    data = config_macros.Current(shadow_missing_ok=True)
+    if args.update or args.always_update:
+        data.update_shadow_file(args.always_update)
+    else:
+        up_to_date = True
+        up_to_date &= data.compare_shadow_file_verbosely()
+        sys.exit(0 if up_to_date else 1)
+
+if __name__ == "__main__":
+    main()