Delete unused license goldens and add check (#6784)

ci/licenses_golden/licenses_lib

-Signature: c6853c1bbc8db501fa71fb05acb5f2ba
-
-UNUSED LICENSES:
-
-
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-USED LICENSES:
-
-====================================================================================================
-LIBRARY: lib
-ORIGIN: ../../../garnet/LICENSE
-TYPE: LicenseType.bsd
-FILE: ../../../lib/tonic/dart_list.cc
-FILE: ../../../lib/tonic/dart_list.h
-----------------------------------------------------------------------------------------------------
-Copyright 2017 The Fuchsia Authors. All rights reserved.
-
-Redistribution and use in source and binary forms, with or without
-modification, are permitted provided that the following conditions are
-met:
-
-   * Redistributions of source code must retain the above copyright
-notice, this list of conditions and the following disclaimer.
-   * Redistributions in binary form must reproduce the above
-copyright notice, this list of conditions and the following disclaimer
-in the documentation and/or other materials provided with the
-distribution.
-   * Neither the name of Google Inc. nor the names of its
-contributors may be used to endorse or promote products derived from
-this software without specific prior written permission.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-====================================================================================================
-
-====================================================================================================
-LIBRARY: lib
-ORIGIN: ../../../lib/tonic/LICENSE
-TYPE: LicenseType.bsd
-FILE: ../../../lib/tonic/converter/dart_converter.cc
-FILE: ../../../lib/tonic/converter/dart_converter.h
-FILE: ../../../lib/tonic/dart_message_handler.cc
-FILE: ../../../lib/tonic/dart_message_handler.h
-FILE: ../../../lib/tonic/dart_microtask_queue.cc
-FILE: ../../../lib/tonic/dart_microtask_queue.h
-FILE: ../../../lib/tonic/dart_sticky_error.cc
-FILE: ../../../lib/tonic/dart_sticky_error.h
-FILE: ../../../lib/tonic/debugger/dart_debugger.cc
-FILE: ../../../lib/tonic/debugger/dart_debugger.h
-FILE: ../../../lib/tonic/file_loader/file_loader.cc
-FILE: ../../../lib/tonic/file_loader/file_loader.h
-FILE: ../../../lib/tonic/logging/dart_error.cc
-FILE: ../../../lib/tonic/logging/dart_error.h
-FILE: ../../../lib/tonic/logging/dart_invoke.cc
-FILE: ../../../lib/tonic/logging/dart_invoke.h
-FILE: ../../../lib/tonic/parsers/packages_map.cc
-FILE: ../../../lib/tonic/parsers/packages_map.h
-FILE: ../../../lib/tonic/scopes/dart_api_scope.h
-FILE: ../../../lib/tonic/scopes/dart_isolate_scope.cc
-FILE: ../../../lib/tonic/scopes/dart_isolate_scope.h
-FILE: ../../../lib/tonic/typed_data/dart_byte_data.h
-FILE: ../../../lib/tonic/typed_data/int32_list.h
-FILE: ../../../lib/tonic/typed_data/uint8_list.h
-----------------------------------------------------------------------------------------------------
-Copyright 2016 The Fuchsia Authors. All rights reserved.
-
-Redistribution and use in source and binary forms, with or without
-modification, are permitted provided that the following conditions are
-met:
-
-   * Redistributions of source code must retain the above copyright
-notice, this list of conditions and the following disclaimer.
-   * Redistributions in binary form must reproduce the above
-copyright notice, this list of conditions and the following disclaimer
-in the documentation and/or other materials provided with the
-distribution.
-   * Neither the name of Google Inc. nor the names of its
-contributors may be used to endorse or promote products derived from
-this software without specific prior written permission.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-====================================================================================================
-
-====================================================================================================
-LIBRARY: lib
-ORIGIN: ../../../lib/tonic/typed_data/dart_byte_data.cc + ../../../lib/tonic/LICENSE
-TYPE: LicenseType.bsd
-FILE: ../../../lib/tonic/dart_args.h
-FILE: ../../../lib/tonic/dart_binding_macros.h
-FILE: ../../../lib/tonic/dart_class_library.cc
-FILE: ../../../lib/tonic/dart_class_library.h
-FILE: ../../../lib/tonic/dart_class_provider.cc
-FILE: ../../../lib/tonic/dart_class_provider.h
-FILE: ../../../lib/tonic/dart_library_natives.cc
-FILE: ../../../lib/tonic/dart_library_natives.h
-FILE: ../../../lib/tonic/dart_persistent_value.cc
-FILE: ../../../lib/tonic/dart_persistent_value.h
-FILE: ../../../lib/tonic/dart_state.cc
-FILE: ../../../lib/tonic/dart_state.h
-FILE: ../../../lib/tonic/dart_wrappable.cc
-FILE: ../../../lib/tonic/dart_wrappable.h
-FILE: ../../../lib/tonic/dart_wrapper_info.h
-FILE: ../../../lib/tonic/typed_data/dart_byte_data.cc
-FILE: ../../../lib/tonic/typed_data/float32_list.cc
-FILE: ../../../lib/tonic/typed_data/float32_list.h
-FILE: ../../../lib/tonic/typed_data/float64_list.cc
-FILE: ../../../lib/tonic/typed_data/float64_list.h
-FILE: ../../../lib/tonic/typed_data/int32_list.cc
-FILE: ../../../lib/tonic/typed_data/uint8_list.cc
-----------------------------------------------------------------------------------------------------
-Copyright 2015 The Fuchsia Authors. All rights reserved.
-
-Redistribution and use in source and binary forms, with or without
-modification, are permitted provided that the following conditions are
-met:
-
-   * Redistributions of source code must retain the above copyright
-notice, this list of conditions and the following disclaimer.
-   * Redistributions in binary form must reproduce the above
-copyright notice, this list of conditions and the following disclaimer
-in the documentation and/or other materials provided with the
-distribution.
-   * Neither the name of Google Inc. nor the names of its
-contributors may be used to endorse or promote products derived from
-this software without specific prior written permission.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-====================================================================================================
-Total license count: 3

tools/licenses/lib/main.dart

@@ -2423,6 +2423,7 @@ Future<Null> main(List<String> arguments) async {
     } else {
       RegExp signaturePattern = new RegExp(r'Signature: (\w+)');
 
+      final List<String> usedGoldens = <String>[];
       bool isFirstComponent = true;
       for (RepositoryDirectory component in root.subdirectories) {
         system.stderr.writeln('Collecting licenses for ${component.io.name}');
@@ -2441,10 +2442,11 @@ Future<Null> main(List<String> arguments) async {
         // Check whether the golden file matches the signature of the current contents
         // of this directory.
         try {
-          system.File goldenFile = new system.File(
-              path.join(argResults['golden'], 'licenses_${component.io.name}'));
+          final String goldenFileName = 'licenses_${component.io.name}';
+          system.File goldenFile = new system.File(path.join(argResults['golden'], goldenFileName));
           String goldenSignature = await goldenFile.openRead()
               .transform(utf8.decoder).transform(new LineSplitter()).first;
+          usedGoldens.add(goldenFileName);
           Match goldenMatch = signaturePattern.matchAsPrefix(goldenSignature);
           if (goldenMatch != null && goldenMatch.group(1) == signature) {
             system.stderr.writeln('    Skipping this component - no change in signature');
@@ -2500,6 +2502,14 @@ Future<Null> main(List<String> arguments) async {
         progress.flush();
         system.stderr.writeln('');
       }
+
+      final Set<String> unusedGoldens = system.Directory(argResults['golden']).listSync().map((system.FileSystemEntity file) => path.basename(file.path)).toSet()
+        ..removeAll(usedGoldens);
+      if (unusedGoldens.isNotEmpty) {
+        system.stderr.writeln('The following golden files in ${argResults['golden']} are unused and need to be deleted:');
+        unusedGoldens.map((String s) => ' * $s').forEach(system.stderr.writeln);
+        system.exit(1);
+      }
     }
   } catch (e, stack) {
     system.stderr.writeln('failure: $e\n$stack');