X-Git-Url: https://git.arvados.org/arvados.git/blobdiff_plain/8819cac2d6c8e0d1673a2126b5cb5664e1ec776e..ae92d144610446849eb568247a44f02ae985c281:/tools/vocabulary-migrate/vocabulary-migrate.py

diff --git a/tools/vocabulary-migrate/vocabulary-migrate.py b/tools/vocabulary-migrate/vocabulary-migrate.py
index c2b9da63b7..89a4f030e8 100644
--- a/tools/vocabulary-migrate/vocabulary-migrate.py
+++ b/tools/vocabulary-migrate/vocabulary-migrate.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 #
 # Copyright (C) The Arvados Authors. All rights reserved.
 #
@@ -21,8 +21,8 @@ class VocabularyError(Exception):
     pass
 
 opts = argparse.ArgumentParser(add_help=False)
-opts.add_argument('--vocabulary-file', type=str, metavar='PATH', default=None,
-                  required=True, help="""
+opts.add_argument('--vocabulary-file', type=str, metavar='PATH', required=True,
+                  help="""
 Use vocabulary definition file at PATH for migration decisions.
 """)
 opts.add_argument('--dry-run', action='store_true', default=False,
@@ -111,8 +111,10 @@ def main(arguments=None):
                 if not args.dry_run and migrated_counter % 100 == 0:
                     logger.info('Migrating {} objects...'.format(migrated_counter))
 
-    if not args.dry_run:
-        logger.info('Done, total object migrated: {}.'.format(migrated_counter))
+    if args.dry_run and migrated_counter == 0:
+        logger.info('Nothing to do.')
+    elif not args.dry_run:
+        logger.info('Done, total objects migrated: {}.'.format(migrated_counter))
     return 0
 
 if __name__ == "__main__":