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path: root/system-dart.patch
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--- ./packages/flutter_tools/bin/tool_backend.dart.orig
+++ ./packages/flutter_tools/bin/tool_backend.dart
@@ -69,12 +69,9 @@
     exit(1);
   }
   final String flutterExecutable = pathJoin(<String>[
-    flutterRoot,
+    '/usr',
     'bin',
-    if (Platform.isWindows)
-      'flutter.bat'
-    else
-      'flutter',
+    'flutter',
   ]);
   final String bundlePlatform = targetPlatform.startsWith('windows') ? 'windows' : targetPlatform;
   final String target = '${buildMode}_bundle_${bundlePlatform}_assets';
--- ./packages/flutter_tools/bin/tool_backend.sh.orig
+++ ./packages/flutter_tools/bin/tool_backend.sh
@@ -3,7 +3,4 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.

-readonly flutter_bin_dir="${FLUTTER_ROOT}/bin"
-readonly dart_bin_dir="${flutter_bin_dir}/cache/dart-sdk/bin"
-
-exec "${dart_bin_dir}/dart" "${FLUTTER_ROOT}/packages/flutter_tools/bin/tool_backend.dart" "${@:1}"
+exec "${DART_ROOT:-"/opt/dart-sdk"}/bin/dart" "${FLUTTER_ROOT}/packages/flutter_tools/bin/tool_backend.dart" "${@:1}"
--- ./packages/flutter_tools/gradle/src/main/groovy/flutter.groovy.orig
+++ ./packages/flutter_tools/gradle/src/main/groovy/flutter.groovy
@@ -264,7 +264,7 @@
         }

         String flutterExecutableName = Os.isFamily(Os.FAMILY_WINDOWS) ? "flutter.bat" : "flutter"
-        flutterExecutable = Paths.get(flutterRoot.absolutePath, "bin", flutterExecutableName).toFile();
+        flutterExecutable = Paths.get("/usr", "bin", flutterExecutableName).toFile();

         if (project.hasProperty("multidex-enabled") &&
             project.property("multidex-enabled").toBoolean()) {
--- ./packages/flutter_tools/lib/src/artifacts.dart.orig
+++ ./packages/flutter_tools/lib/src/artifacts.dart
@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.

+import 'dart:io' as io show Platform;
+
 import 'package:file/memory.dart';
 import 'package:meta/meta.dart';
 import 'package:process/process.dart';
@@ -1059,48 +1061,7 @@
   }

   String _getDartSdkPath() {
-    final String builtPath = _fileSystem.path.join(_hostEngineOutPath, 'dart-sdk');
-    if (_fileSystem.isDirectorySync(_fileSystem.path.join(builtPath, 'bin'))) {
-      return builtPath;
-    }
-
-    // If we couldn't find a built dart sdk, let's look for a prebuilt one.
-    final String prebuiltPath = _fileSystem.path.join(_getFlutterPrebuiltsPath(), _getPrebuiltTarget(), 'dart-sdk');
-    if (_fileSystem.isDirectorySync(prebuiltPath)) {
-      return prebuiltPath;
-    }
-
-    throw ToolExit('Unable to find a built dart sdk at: "$builtPath" or a prebuilt dart sdk at: "$prebuiltPath"');
-  }
-
-  String _getFlutterPrebuiltsPath() {
-    final String engineSrcPath = _fileSystem.path.dirname(_fileSystem.path.dirname(_hostEngineOutPath));
-    return _fileSystem.path.join(engineSrcPath, 'flutter', 'prebuilts');
-  }
-
-  String _getPrebuiltTarget() {
-    final TargetPlatform hostPlatform = _currentHostPlatform(_platform, _operatingSystemUtils);
-    switch (hostPlatform) {
-      case TargetPlatform.darwin:
-        return 'macos-x64';
-      case TargetPlatform.linux_arm64:
-        return 'linux-arm64';
-      case TargetPlatform.linux_x64:
-        return 'linux-x64';
-      case TargetPlatform.windows_x64:
-        return 'windows-x64';
-      case TargetPlatform.ios:
-      case TargetPlatform.android:
-      case TargetPlatform.android_arm:
-      case TargetPlatform.android_arm64:
-      case TargetPlatform.android_x64:
-      case TargetPlatform.android_x86:
-      case TargetPlatform.fuchsia_arm64:
-      case TargetPlatform.fuchsia_x64:
-      case TargetPlatform.web_javascript:
-      case TargetPlatform.tester:
-        throwToolExit('Unsupported host platform: $hostPlatform');
-    }
+    return io.Platform.environment['DART_ROOT'] ?? '/opt/dart-sdk';
   }

   String _getFlutterWebSdkPath() {
@@ -1382,7 +1343,7 @@

 /// Locate the Dart SDK.
 String _dartSdkPath(Cache cache) {
-  return cache.getRoot().childDirectory('dart-sdk').path;
+  return io.Platform.environment['DART_ROOT'] ?? '/opt/dart-sdk';
 }

 class _TestArtifacts implements Artifacts {
--- ./packages/flutter_tools/lib/src/cache.dart.orig
+++ ./packages/flutter_tools/lib/src/cache.dart
@@ -3,6 +3,7 @@
 // found in the LICENSE file.

 import 'dart:async';
+import 'dart:io' as io show Platform;

 import 'package:crypto/crypto.dart';
 import 'package:file/memory.dart';
@@ -380,8 +381,8 @@

   String get devToolsVersion {
     if (_devToolsVersion == null) {
-      const String devToolsDirPath = 'dart-sdk/bin/resources/devtools';
-      final Directory devToolsDir = getCacheDir(devToolsDirPath, shouldCreate: false);
+      final String dartSdkRoot = io.Platform.environment['DART_ROOT'] ?? '/opt/dart-sdk';
+      final Directory devToolsDir = _fileSystem.directory(dartSdkRoot + '/bin/resources/devtools');
       if (!devToolsDir.existsSync()) {
         throw Exception('Could not find directory at ${devToolsDir.path}');
       }
--- ./packages/flutter_tools/lib/src/dart/pub.dart.orig
+++ ./packages/flutter_tools/lib/src/dart/pub.dart
@@ -545,9 +545,7 @@
   List<String> _computePubCommand() {
     // TODO(zanderso): refactor to use artifacts.
     final String sdkPath = _fileSystem.path.joinAll(<String>[
-      Cache.flutterRoot!,
-      'bin',
-      'cache',
+      '/opt',
       'dart-sdk',
       'bin',
       'dart',
--- ./packages/flutter_tools/lib/src/dart/language_version.dart.orig
+++ ./packages/flutter_tools/lib/src/dart/language_version.dart
@@ -3,6 +3,7 @@
 // found in the LICENSE file.

 import 'dart:async';
+import 'dart:io' as io show Platform;

 import 'package:file/file.dart';
 import 'package:package_config/package_config.dart';
@@ -26,7 +27,7 @@
   }
   // Either reading the file or parsing the version could fail on a corrupt Dart SDK.
   // let it crash so it shows up in crash logging.
-  final File versionFile = fileSystem.file(fileSystem.path.join(flutterRoot, 'bin', 'cache', 'dart-sdk', 'version'));
+  final File versionFile = fileSystem.file(io.Platform.environment['DART_ROOT'] ?? '/opt/dart-sdk');
   if (!versionFile.existsSync() && _inUnitTest()) {
     return LanguageVersion(2, 12);
   }