[#3678] ./tools/check-messages.py -g now prints a warning if premium is missing

Author: andrei-pavel

doc/sphinx/debug-messages.rst

@@ -1,5 +1,5 @@
 ..
-    File generated by "./tools/check-messages.py -a". Do not edit by hand.
+    File generated by "./tools/check-messages.py -g". Do not edit by hand.
 
 Messages printed on debuglevel 0
 ================================

tools/check-messages.py

@@ -1,6 +1,6 @@
 #!/usr/bin/env python3
 
-# Copyright (C) 2024 Internet Systems Consortium, Inc. ("ISC")
+# Copyright (C) 2024-2025 Internet Systems Consortium, Inc. ("ISC")
 #
 # This Source Code Form is subject to the terms of the Mozilla Public
 # License, v. 2.0. If a copy of the MPL was not distributed with this
@@ -160,13 +160,13 @@ def generate_page_with_messages_printed_on_each_debug_level(messages, debug_leve
         content.append(subtitle)
         content.append('=' * len(subtitle))
         content.append('\n')
-        for message_id, message in messages_at_this_log_level:
+        for message_id, _ in messages_at_this_log_level:
             content.append(f'- {message_id}')
         content.append('\n')
     parent_dir = os.path.dirname(os.path.realpath(os.path.abspath(sys.argv[0])))
     with open(f'{parent_dir}/../doc/sphinx/debug-messages.rst', 'w', encoding='utf-8') as f:
         f.write('..\n')
-        f.write('    File generated by "./tools/check-messages.py -a". Do not edit by hand.\n\n')
+        f.write('    File generated by "./tools/check-messages.py -g". Do not edit by hand.\n\n')
         for i in content:
             f.write(i)
             f.write('\n')
@@ -334,7 +334,15 @@ def main():
         debug_levels[level] = int(debug_levels[level])
 
     if args.autofix or args.generate_debug_messages_page:
-        generate_page_with_messages_printed_on_each_debug_level(messages, debug_levels)
+        parent_dir = os.path.dirname(os.path.realpath(os.path.abspath(sys.argv[0])))
+        if os.path.isdir(os.path.realpath(f'{parent_dir}/../premium')):
+            generate_page_with_messages_printed_on_each_debug_level(messages, debug_levels)
+        else:
+            print('WARNING: Not generating debug-messages.rst. Premium is missing. '
+                  'It would result in incomplete generated content.', file=sys.stderr)
+            if args.autofix:
+                failure = True
+
         if args.generate_debug_messages_page:
             return