Select MPL instead of LGPL (#7991)

ci/licenses_golden/tool_signature

-Signature: 293c762c71d027f77cf88deb80f9e78e
+Signature: 91b3b5b8c1ef9e911fd65b636d009be8
 

tools/licenses/README.md

@@ -10,8 +10,17 @@ cd flutter/ci/licenses_golden
 patch -p2 < my/patch/file
 ```
 
-## Regenerate License Files (Only works on Linux)
-To update the golden license files, make sure you've rebased your branch to the latest upstream master and then run the following in this directory:
+## Check for license changes (Only works on Linux)
+
+This script has two sets of output files: "goldens", which describe
+the current license state of the repository, and the actual real
+LICENSE file, which is what matters.
+
+We look at changes to the goldens to determine if there are any actual
+changes to the licenses.
+
+To update the goldens, make sure you've rebased your branch to the
+latest upstream master and then run the following in this directory:
 
 ```
 pub get
@@ -20,9 +29,29 @@ rm -rf ../../../out/licenses
 dart lib/main.dart --src ../../.. --out ../../../out/licenses --golden ../../ci/licenses_golden
 ```
 
-Then copy any affected files from `../../../out/licenses` to `../../ci/licenses_golden` and add them to your change.
+In order for the license script to work correctly, you need to remove
+any untracked files inside `engine/src` (the buildroot), not just
+`engine/src/flutter`.
+
+Once the script has finished, copy any affected files from
+`../../../out/licenses` to `../../ci/licenses_golden` and add them to
+your change, and examine the diffs to see what changed.
+
+```
+cp ../../../out/licenses/* ../../ci/licenses_golden
+git diff
+```
+
+If the only changes are to what files are included, then you're good
+to go. However, if any of the _licenses_ changed, whether new licenses
+are added, old ones removed, or any have their content changed in
+_any_ way (including, e.g., whitespace changes), or if the affected
+libraries change, **you must update the actual license file**.
 
-The `sky/packages/sky_engine/LICENSE` file is included in product releases and should be updated any time the golden file changes in a way that involves changes to anything other than the FILE lines.  To update this file, run:
+The `sky/packages/sky_engine/LICENSE` file is the one actually
+included in product releases and the one that should be updated any
+time the golden file changes in a way that involves changes to
+anything other than the `FILE` lines. To update this file, run:
 
 ```
 pub get
@@ -30,4 +59,7 @@ gclient sync
 dart lib/main.dart --release --src ../../.. --out ../../../out/licenses > ../../sky/packages/sky_engine/LICENSE
 ```
 
-**In order for the license script to work, please remove all untracked files inside `engine/src` (not just `engine/src/flutter`)**
+The bots do not verify that you did this step, it's important that you
+do it! When reviewing patches, if you see a change to the golden
+files, check to see if there's a corresponding change to the LICENSE
+file!

tools/licenses/lib/licenses.dart

@@ -269,6 +269,10 @@ abstract class License implements Comparable<License> {
         body = system.File('data/academic-3.0').readAsStringSync();
         type = LicenseType.afl;
         break;
+      case 'Mozilla Public License:1.1':
+        body = system.File('data/mozilla-1.1').readAsStringSync();
+        type = LicenseType.mpl;
+        break;
       case 'http://mozilla.org/MPL/2.0/:2.0':
         body = system.File('data/mozilla-2.0').readAsStringSync();
         type = LicenseType.mpl;

tools/licenses/lib/main.dart

@@ -1184,7 +1184,7 @@ class _RepositoryDirectory extends _RepositoryEntry implements LicenseSource {
           result.addAll(licenses);
           progress.advance(success: true);
         } catch (e, stack) {
-          system.stderr.writeln('error searching for copyright in: ${file.io}\n$e');
+          system.stderr.writeln('\nerror searching for copyright in: ${file.io}\n$e');
           if (e is! String)
             system.stderr.writeln(stack);
           system.stderr.writeln('\n');
@@ -2256,6 +2256,9 @@ Future<void> _collectLicensesForComponent(_RepositoryDirectory componentRoot, {
 
   final List<License> licenses = Set<License>.from(componentRoot.getLicenses(progress).toList()).toList();
 
+  if (progress.hadErrors)
+    throw 'Had failures while collecting licenses.';
+
   sink.writeln('UNUSED LICENSES:\n');
   final List<String> unusedLicenses = licenses
     .where((License license) => !license.isUsed)
@@ -2268,6 +2271,38 @@ Future<void> _collectLicensesForComponent(_RepositoryDirectory componentRoot, {
   sink.writeln('USED LICENSES:\n');
   final List<License> usedLicenses = licenses.where((License license) => license.isUsed).toList();
   final List<String> output = usedLicenses.map((License license) => license.toString()).toList();
+  for (int index = 0; index < output.length; index += 1) {
+    // The strings we look for here are strings which we do not expect to see in
+    // any of the licenses we use. They either represent examples of misparsing
+    // licenses (issues we've previously run into and fixed), or licenses we
+    // know we are trying to avoid (e.g. the GPL, or licenses that only apply to
+    // test content which shouldn't get built at all).
+    // If you find that one of these tests is getting hit, and it's not obvious
+    // to you why the relevant license is a problem, please ask around (e.g. try
+    // asking Hixie). Do not merely remove one of these checks, sometimes the
+    // issues involved are relatively subtle.
+    if (output[index].contains('Version: MPL 1.1/GPL 2.0/LGPL 2.1'))
+      throw 'Unexpected trilicense block found in: ${usedLicenses[index].origin}';
+    if (output[index].contains('The contents of this file are subject to the Mozilla Public License Version'))
+      throw 'Unexpected MPL block found in: ${usedLicenses[index].origin}';
+    if (output[index].contains('You should have received a copy of the GNU'))
+      throw 'Unexpected GPL block found in: ${usedLicenses[index].origin}';
+    if (output[index].contains('BoringSSL is a fork of OpenSSL'))
+      throw 'Unexpected legacy BoringSSL block found in: ${usedLicenses[index].origin}';
+    if (output[index].contains('Contents of this folder are ported from'))
+      throw 'Unexpected block found in: ${usedLicenses[index].origin}';
+    if (output[index].contains('https://github.com/w3c/web-platform-tests/tree/master/selectors-api'))
+      throw 'Unexpected W3C content found in: ${usedLicenses[index].origin}';
+    if (output[index].contains('http://www.w3.org/Consortium/Legal/2008/04-testsuite-copyright.html'))
+      throw 'Unexpected W3C copyright found in: ${usedLicenses[index].origin}';
+    if (output[index].contains('It is based on commit'))
+      throw 'Unexpected content found in: ${usedLicenses[index].origin}';
+    if (output[index].contains('The original code is covered by the dual-licensing approach described in:'))
+      throw 'Unexpected old license reference found in: ${usedLicenses[index].origin}';
+    if (output[index].contains('must choose'))
+      throw 'Unexpected indecisiveness found in: ${usedLicenses[index].origin}';
+  }
+
   output.sort();
   sink.writeln(output.join('\n\n'));
   sink.writeln('Total license count: ${licenses.length}');
@@ -2396,17 +2431,3 @@ Future<void> main(List<String> arguments) async {
     system.exit(1);
   }
 }
-
-// Sanity checks:
-//
-// The following substrings shouldn't be in the output:
-//   Version: MPL 1.1/GPL 2.0/LGPL 2.1
-//   The contents of this file are subject to the Mozilla Public License Version
-//   You should have received a copy of the GNU
-//   BoringSSL is a fork of OpenSSL
-//   Contents of this folder are ported from
-//   https://github.com/w3c/web-platform-tests/tree/master/selectors-api
-//   It is based on commit
-//   The original code is covered by the dual-licensing approach described in:
-//   http://www.w3.org/Consortium/Legal/2008/04-testsuite-copyright.html
-//   must choose

tools/licenses/lib/patterns.dart

@@ -980,14 +980,14 @@ final List<MultipleVersionedLicenseReferencePattern> csReferencesByUrl = <Multip
   MultipleVersionedLicenseReferencePattern(
     firstPrefixIndex: 1,
     indentPrefixIndex: 2,
-    licenseIndices: const <int>[3],
-    versionIndicies: const <int, int>{ 3:4 },
+    licenseIndices: const <int>[3], // 5 is lgpl, which we're actively not selecting
+    versionIndicies: const <int, int>{ 3:4 }, // 5:6 for lgpl
     pattern: RegExp(
       kIndent +
       r'(?:Version: [GMPL/012. ]+ *\n'
       r'^(?:(?:\1\2? *)? *\n)*'
-      r'^\1\2)?The contents of this file are subject to the Mozilla Public License Version *\n'
-      r'^\1\2(?:1\.1) \(the "License"\); you may not use this file except in compliance with *\n'
+      r'^\1\2)?The contents of this file are subject to the (Mozilla Public License) Version *\n'
+      r'^\1\2(1\.1) \(the "License"\); you may not use this file except in compliance with *\n'
       r'^\1\2the License\. +You may obtain a copy of the License at *\n'
       r'^\1\2http://www\.mozilla\.org/MPL/ *\n'
       r'^(?:(?:\1\2? *)? *\n)*'