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[et] Lookup output filesystem path, not label #52248

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Apr 22, 2024
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[et] Lookup output filesystem path, not label #52248

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76 changes: 52 additions & 24 deletions tools/engine_tool/lib/src/gn_utils.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -77,30 +77,9 @@ final class BuildTarget {
Future<Map<String, BuildTarget>> findTargets(
Environment environment, Directory buildDir) async {
final Map<String, BuildTarget> r = <String, BuildTarget>{};
final List<String> getBuildInfoCommandLine = <String>[
gnBinPath(environment),
'desc',
buildDir.path,
'*',
'--format=json',
];

final ProcessRunnerResult result = await environment.processRunner.runProcess(
getBuildInfoCommandLine,
workingDirectory: environment.engine.srcDir,
failOk: true);

// Handle any process failures.
fatalIfFailed(environment, getBuildInfoCommandLine, result);

late final Map<String, Object?> jsonResult;
try {
jsonResult = jsonDecode(result.stdout) as Map<String, Object?>;
} catch (e) {
environment.logger.fatal(
'gn desc output could not be parsed:\nE=$e\nIN=${result.stdout}\n');
}

final Map<String, Object?> jsonResult =
await _runGnDesc(buildDir.path, '*', environment);
for (final MapEntry<String, Object?> targetEntry in jsonResult.entries) {
final String label = targetEntry.key;
if (targetEntry.value == null) {
Expand All @@ -120,7 +99,7 @@ Future<Map<String, BuildTarget>> findTargets(
}
final bool testOnly = getBool(properties, 'testonly');
final List<String> outputs =
getListOfString(properties, 'outputs') ?? <String>[];
await _runGnOutputs(buildDir.path, label, environment);
File? executable;
if (type == BuildTargetType.executable) {
if (outputs.isEmpty) {
Expand All @@ -135,6 +114,55 @@ Future<Map<String, BuildTarget>> findTargets(
return r;
}

/// Returns the JSON output of running `gn desc buildDir label`.
Future<Map<String, Object?>> _runGnDesc(
String buildDir, String label, Environment environment) async {
final List<String> commandline = <String>[
gnBinPath(environment),
'desc',
buildDir,
label,
'--format=json',
];

final ProcessRunnerResult result = await environment.processRunner.runProcess(
commandline,
workingDirectory: environment.engine.srcDir,
failOk: true);

// Handle any process failures.
fatalIfFailed(environment, commandline, result);

late final Map<String, Object?> jsonResult;
try {
jsonResult = jsonDecode(result.stdout) as Map<String, Object?>;
} catch (e) {
environment.logger.fatal(
'gn desc output could not be parsed:\nE=$e\nIN=${result.stdout}\n');
}
return jsonResult;
}

/// Returns the output paths returned by `gn outputs buildDir label`.
Future<List<String>> _runGnOutputs(
String buildDir, String label, Environment environment) async {
final List<String> commandline = <String>[
gnBinPath(environment),
'outputs',
buildDir,
label,
];
final ProcessRunnerResult result = await environment.processRunner.runProcess(
commandline,
workingDirectory: environment.engine.srcDir,
failOk: true);

// Handle any process failures.
fatalIfFailed(environment, commandline, result);

return result.stdout.split('\n');
}

/// Process selectors and filter allTargets for matches.
///
/// We support:
Expand Down
20 changes: 10 additions & 10 deletions tools/engine_tool/test/build_command_test.dart
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Expand Up @@ -360,11 +360,11 @@ void main() {
'//flutter/fml:fml_arc_unittests',
]);
expect(result, equals(0));
expect(testEnv.processHistory.length, greaterThanOrEqualTo(2));
expect(testEnv.processHistory[3].command[0], contains('ninja'));
expect(testEnv.processHistory[3].command[2], endsWith('/host_debug'));
expect(testEnv.processHistory.length, greaterThan(6));
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Changed to a strictly greater-than check so that it matches the processHistory index we refer to, which will make it a little more obvious to people who modify this in the future.

expect(testEnv.processHistory[6].command[0], contains('ninja'));
expect(testEnv.processHistory[6].command[2], endsWith('/host_debug'));
expect(
testEnv.processHistory[3].command[5],
testEnv.processHistory[6].command[5],
equals('flutter/fml:fml_arc_unittests'),
);
} finally {
Expand All @@ -389,19 +389,19 @@ void main() {
'//flutter/...',
]);
expect(result, equals(0));
expect(testEnv.processHistory.length, greaterThanOrEqualTo(2));
expect(testEnv.processHistory[3].command[0], contains('ninja'));
expect(testEnv.processHistory[3].command[2], endsWith('/host_debug'));
expect(testEnv.processHistory.length, greaterThan(6));
expect(testEnv.processHistory[6].command[0], contains('ninja'));
expect(testEnv.processHistory[6].command[2], endsWith('/host_debug'));
expect(
testEnv.processHistory[3].command[5],
testEnv.processHistory[6].command[5],
equals('flutter/display_list:display_list_unittests'),
);
expect(
testEnv.processHistory[3].command[6],
testEnv.processHistory[6].command[6],
equals('flutter/flow:flow_unittests'),
);
expect(
testEnv.processHistory[3].command[7],
testEnv.processHistory[6].command[7],
equals('flutter/fml:fml_arc_unittests'),
);
} finally {
Expand Down
2 changes: 2 additions & 0 deletions tools/engine_tool/test/gn_utils_test.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -39,6 +39,8 @@ void main() {
final List<CannedProcess> cannedProcesses = <CannedProcess>[
CannedProcess((List<String> command) => command.contains('desc'),
stdout: fixtures.gnDescOutput()),
CannedProcess((List<String> command) => command.contains('outputs'),
stdout: 'display_list_unittests'),
];

test('find test targets', () async {
Expand Down
4 changes: 3 additions & 1 deletion tools/engine_tool/test/test_command_test.dart
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Expand Up @@ -42,6 +42,8 @@ void main() {
final List<CannedProcess> cannedProcesses = <CannedProcess>[
CannedProcess((List<String> command) => command.contains('desc'),
stdout: fixtures.gnDescOutput()),
CannedProcess((List<String> command) => command.contains('outputs'),
stdout: 'display_list_unittests'),
];

test('test command executes test', () async {
Expand Down Expand Up @@ -83,7 +85,7 @@ void main() {
'//third_party/protobuf:protoc',
]);
expect(result, equals(1));
expect(testEnvironment.processHistory.length, lessThan(3));
expect(testEnvironment.processHistory.length, lessThan(6));
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Here and in the test above it: This expectation is impacted by implementation details of the test command. I don't think the number of processes executed is the right test, and instead we should just test that test processes are executed and that non-test processes are executed.

I can send out a followup that fixes that. (I realise I also just added this test in a previous patch so I'm 100% to blame for this one :P)

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Yes, I think this count is too brittle. Better to have something like:

expect(testEnvironment.processHistory, executed('gn desc'));

expect(testEnvironment.processHistory.where((ExecutedProcess process) {
return process.command[0].contains('protoc');
}), isEmpty);
Expand Down