[web] use a different method for launching desktop safari (flutter/engine#27567)

engine/src/flutter/lib/web_ui/dev/macos_info.dart

@@ -1,63 +0,0 @@
-// Copyright 2013 The Flutter Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-import 'dart:convert';
-
-import 'utils.dart';
-
-class MacOSInfo {
-  /// Print information collected from the operating system.
-  ///
-  /// Built in tools such as `system_profiler` and `defaults` are utilized.
-  Future<void> printInformation() async {
-    await _printSafariApplications();
-    await _printSafariDefaults();
-    await _printUserLimits();
-  }
-
-  /// Print information on applications in the system that contains string
-  /// `Safari`.
-  Future<void> _printSafariApplications() async {
-    final ProcessManager systemProfiler = await startProcess(
-      'system_profiler',
-      <String>['SPApplicationsDataType', '-json'],
-      evalOutput: true,
-    );
-    final String systemProfileJson = await systemProfiler.evalStdout();
-
-    final Map<String, dynamic> json =
-        jsonDecode(systemProfileJson) as Map<String, dynamic>;
-    final List<dynamic> systemProfile = json.values.first as List<dynamic>;
-    for (int i = 0; i < systemProfile.length; i++) {
-      final Map<String, dynamic> application =
-          systemProfile[i] as Map<String, dynamic>;
-      final String applicationName = application['_name'] as String;
-      if (applicationName.contains('Safari')) {
-        print('application: $applicationName '
-            'fullInfo: ${application.toString()}');
-      }
-    }
-  }
-
-  /// Print all the defaults in the system related to Safari.
-  Future<void> _printSafariDefaults() async {
-    final ProcessManager defaults = await startProcess(
-      '/usr/bin/defaults',
-      <String>['find', 'Safari'],
-      evalOutput: true,
-    );
-    print('Safari related defaults:\n ${await defaults.evalStdout()}');
-  }
-
-  /// Print user limits (file and process).
-  Future<void> _printUserLimits() async {
-    ProcessManager ulimit = await startProcess('ulimit', <String>['-n'], evalOutput: true);
-    final String fileLimit = await ulimit.evalStdout();
-    print('MacOS file limit: $fileLimit');
-
-    ulimit = await startProcess('ulimit', <String>['-u'], evalOutput: true);
-    final String processLimit = await ulimit.evalStdout();
-    print('MacOS process limit: $processLimit');
-  }
-}

engine/src/flutter/lib/web_ui/dev/safari_macos.dart

@@ -3,13 +3,14 @@
 // found in the LICENSE file.
 
 import 'dart:async';
+import 'dart:convert' show json;
 import 'dart:io';
 
+import 'package:path/path.dart' as pathlib;
 import 'package:test_api/src/backend/runtime.dart';
 
 import 'browser.dart';
-import 'common.dart';
-import 'safari_installation.dart';
+import 'utils.dart';
 
 /// Provides an environment for the desktop variant of Safari running on macOS.
 class SafariMacOsEnvironment implements BrowserEnvironment {
@@ -45,34 +46,44 @@ class SafariMacOs extends Browser {
   @override
   final String name = 'Safari macOS';
 
-  /// Starts a new instance of Safari open to the given [url], which may be a
-  /// [Uri].
+  /// Starts a new instance of Safari open to the given [url].
   factory SafariMacOs(Uri url) {
-    final String version = SafariArgParser.instance.version;
     return SafariMacOs._(() async {
-      // TODO(nurhan): Configure info log for LUCI.
-      final BrowserInstallation installation = await getOrInstallSafari(
-        version,
-        infoLog: DevNull(),
-      );
+      // This hack to programmatically launch a test in Safari is borrowed from
+      // Karma: https://github.com/karma-runner/karma-safari-launcher/issues/29
+      //
+      // The issue is that opening an HTML file directly causes Safari to pop up
+      // a UI prompt to confirm the opening of a file. However, files under
+      // Library/Containers/com.apple.Safari/Data are exempt from this pop up.
+      // We create a "trampoline" file in this directory. The trampoline
+      // redirects the browser to the test URL in a <script>.
+      final String homePath = Platform.environment['HOME']!;
+      final Directory safariDataDirectory = Directory(pathlib.join(
+        homePath,
+        'Library/Containers/com.apple.Safari/Data',
+      ));
+      final Directory trampolineDirectory = await safariDataDirectory.createTemp('web-engine-test-trampoline-');
 
-      // In the macOS Catalina opening Safari browser with a file brings
-      // a popup which halts the test.
-      // The following list of arguments needs to be provided to the `open`
-      // command to open Safari for a given URL. In summary, `open` tool opens
-      // a new Safari browser (even if one is already open), opens it with no
-      // persistent state and wait until it opens.
-      // The details copied from `man open` on macOS.
-      // TODO(nurhan): https://github.com/flutter/flutter/issues/50809
-      final Process process = await Process.start(installation.executable, <String>[
-        // These are flags for `open` command line tool.
-        '-F', // Open a fresh Safari with no persistent state.
-        '-W', // Wait until the Safari opens.
-        '-n', // Open a new instance of the Safari even another one is open.
-        '-b', // Specifies the bundle identifier for the application to use.
-        'com.apple.Safari', // Bundle identifier for Safari.
-        '${url.toString()}'
-      ]);
+      // Clean up trampoline files/directories before exiting felt.
+      cleanupCallbacks.add(() async {
+        if (trampolineDirectory.existsSync()) {
+          trampolineDirectory.delete(recursive: true);
+        }
+      });
+
+      final File trampoline = File(
+        pathlib.join(trampolineDirectory.path, 'trampoline.html'),
+      );
+      await trampoline.writeAsString('''
+<script>
+  location = ${json.encode(url.toString())};
+</script>
+      ''');
+
+      final Process process = await Process.start(
+        '/Applications/Safari.app/Contents/MacOS/Safari',
+        <String>[trampoline.path],
+      );
 
       return process;
     });

engine/src/flutter/lib/web_ui/dev/test_runner.dart

@@ -39,7 +39,6 @@ import 'environment.dart';
 import 'exceptions.dart';
 import 'firefox.dart';
 import 'firefox_installer.dart';
-import 'macos_info.dart';
 import 'safari_installation.dart';
 import 'safari_ios.dart';
 import 'safari_macos.dart';
@@ -180,14 +179,8 @@ class TestCommand extends Command<bool> with ArgUtils<bool> {
     }
     GeneralTestsArgumentParser.instance.parseOptions(argResults!);
 
-    /// Collect information on the bot.
-    if (isSafariOnMacOS && isLuci) {
-      final MacOSInfo macOsInfo = new MacOSInfo();
-      await macOsInfo.printInformation();
-    }
-
     final Pipeline testPipeline = Pipeline(steps: <PipelineStep>[
-      ClearTerminalScreenStep(),
+      if (isWatchMode) ClearTerminalScreenStep(),
       TestRunnerStep(this),
     ]);
     await testPipeline.run();