checklicenses: Do not report unused suppressions when checking a sub-directory.

tools/checklicenses/checklicenses.py

 #!/usr/bin/env python
 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Makes sure that all files contain proper licensing information."""
 
 
 import optparse
 import os.path
@@ skipping 442 matching lines @@
       if matched_prefixes:
         used_suppressions.update(set(matched_prefixes))
         continue
 
     print "'%s' has non-whitelisted license '%s'" % (filename, license)
     success = False
 
   if success:
     print "\nSUCCESS\n"
 
-    unused_suppressions = set(
-      PATH_SPECIFIC_WHITELISTED_LICENSES.keys()).difference(used_suppressions)
-    if unused_suppressions:
-      print "\nNOTE: unused suppressions detected:\n"
-      print '\n'.join(unused_suppressions)
+    if not len(args):
+      unused_suppressions = set(
+        PATH_SPECIFIC_WHITELISTED_LICENSES.keys()).difference(used_suppressions)
+      if unused_suppressions:
+        print "\nNOTE: unused suppressions detected:\n"
+        print '\n'.join(unused_suppressions)
 
     return 0
   else:
     print "\nFAILED\n"
     print "Please read",
     print "http://www.chromium.org/developers/adding-3rd-party-libraries"
     print "for more info how to handle the failure."
     print
     print "Please respect OWNERS of checklicenses.py. Changes violating"
     print "this requirement may be reverted."
@@ skipping 19 matching lines @@
   option_parser.add_option('--ignore-suppressions',
                            action='store_true',
                            default=False,
                            help='Ignore path-specific license whitelist.')
   options, args = option_parser.parse_args()
   return check_licenses(options, args)
 
 
 if '__main__' == __name__:
   sys.exit(main())