Add and use --quiet flag on the license checker (#22485)

ci/licenses.sh

@@ -33,6 +33,14 @@ SRC_DIR="$(cd "$SCRIPT_DIR/../.."; pwd -P)"
 DART_BIN="$SRC_DIR/third_party/dart/tools/sdks/dart-sdk/bin"
 PATH="$DART_BIN:$PATH"
 
+# Use:
+#   env VERBOSE=1 ./ci/licenses.sh
+# to turn on verbose progress report printing.
+QUIET="--quiet"
+if [[ "${VERBOSE}" == "1" ]]; then
+  QUIET=""
+fi
+
 echo "Verifying license script is still happy..."
 echo "Using pub from $(command -v pub), dart from $(command -v dart)"
 
@@ -58,7 +66,8 @@ function collect_licenses() (
   dart --enable-asserts lib/main.dart         \
     --src ../../..                            \
     --out ../../../out/license_script_output  \
-    --golden ../../ci/licenses_golden
+    --golden ../../ci/licenses_golden \
+    "${QUIET}"
 )
 
 # Verifies the licenses in the repo.
@@ -137,4 +146,4 @@ function verify_licenses() (
   return $exitStatus
 )
 
-verify_licenses
\ No newline at end of file
+verify_licenses

ci/licenses_golden/tool_signature

-Signature: 1f9d73861a9bb353a12cfa2ba38f6a12
+Signature: 164585dad7317491c0f98b96519f87c7
 

tools/licenses/lib/main.dart

@@ -2319,7 +2319,7 @@ class _RepositoryRoot extends _RepositoryDirectory {
 
 
 class _Progress {
-  _Progress(this.max) {
+  _Progress(this.max, {bool quiet = false}) : _quiet = quiet {
     // This may happen when a git client contains left-over empty component
     // directories after DEPS file changes.
     if (max <= 0)
@@ -2327,6 +2327,7 @@ class _Progress {
   }
 
   final int max;
+  final bool _quiet;
   int get withLicense => _withLicense;
   int _withLicense = 0;
   int get withoutLicense => _withoutLicense;
@@ -2354,11 +2355,15 @@ class _Progress {
   void update({bool flush = false}) {
     if (_lastUpdate == null || _lastUpdate.elapsedMilliseconds > 90 || flush) {
       _lastUpdate ??= Stopwatch();
-      final String line = toString();
-      system.stderr.write('\r$line');
-      if (_lastLength > line.length)
-        system.stderr.write(' ' * (_lastLength - line.length));
-      _lastLength = line.length;
+      if (_quiet) {
+        system.stderr.write('.');
+      } else {
+        final String line = toString();
+        system.stderr.write('\r$line');
+        if (_lastLength > line.length)
+          system.stderr.write(' ' * (_lastLength - line.length));
+        _lastLength = line.length;
+      }
       _lastUpdate.reset();
       _lastUpdate.start();
     }
@@ -2423,6 +2428,7 @@ Future<void> _collectLicensesForComponent(_RepositoryDirectory componentRoot, {
   String outputGoldenPath,
   bool writeSignature,
   bool force,
+  bool quiet,
 }) async {
   // Check whether the golden file matches the signature of the current contents of this directory.
   final String goldenSignature = await _readSignature(inputGoldenPath);
@@ -2432,7 +2438,7 @@ Future<void> _collectLicensesForComponent(_RepositoryDirectory componentRoot, {
     return;
   }
 
-  final _Progress progress = _Progress(componentRoot.fileCount);
+  final _Progress progress = _Progress(componentRoot.fileCount, quiet: quiet);
 
   final system.File outFile = system.File(outputGoldenPath);
   final system.IOSink sink = outFile.openWrite();
@@ -2506,9 +2512,11 @@ Future<void> main(List<String> arguments) async {
     ..addOption('src', help: 'The root of the engine source')
     ..addOption('out', help: 'The directory where output is written')
     ..addOption('golden', help: 'The directory containing golden results')
+    ..addFlag('quiet', help: 'If set, the diagnostic output is much less verbose')
     ..addFlag('release', help: 'Print output in the format used for product releases');
 
   final ArgResults argResults = parser.parse(arguments);
+  final bool quiet = argResults['quiet'];
   final bool releaseMode = argResults['release'];
   if (argResults['src'] == null) {
     print('Flutter license script: Must provide --src directory');
@@ -2538,7 +2546,8 @@ Future<void> main(List<String> arguments) async {
 
     if (releaseMode) {
       system.stderr.writeln('Collecting licenses...');
-      final _Progress progress = _Progress(root.fileCount);
+      system.stderr.writeln('quiet: $quiet');
+      final _Progress progress = _Progress(root.fileCount, quiet: quiet);
       final List<License> licenses = Set<License>.from(root.getLicenses(progress).toList()).toList();
       if (progress.hadErrors)
         throw 'Had failures while collecting licenses.';
@@ -2596,6 +2605,7 @@ Future<void> main(List<String> arguments) async {
             outputGoldenPath: path.join(argResults['out'], goldenFileName),
             writeSignature: component.io.name != 'flutter',
             force: forceRunAll || component.io.name == 'flutter',
+            quiet: quiet,
         );
         usedGoldens.add(goldenFileName);
       }