aports/testing/flutter/no-cache.patch

--- ./packages/flutter_tools/lib/src/cache.dart.orig
+++ ./packages/flutter_tools/lib/src/cache.dart
@@ -8,6 +8,7 @@
 library;
 
 import 'dart:async';
+import 'dart:io' as io show Platform;
 
 import 'package:crypto/crypto.dart';
 import 'package:file/memory.dart';
@@ -318,7 +319,7 @@
   var fatalStorageWarning = true;
 
   static RandomAccessFile? _lock;
-  static var _lockEnabled = true;
+  static var _lockEnabled = false;
 
   /// Turn off the [lock]/[releaseLock] mechanism.
   ///
@@ -420,8 +421,8 @@
 
   String get devToolsVersion {
     if (_devToolsVersion == null) {
-      const devToolsDirPath = 'dart-sdk/bin/resources/devtools';
-      final Directory devToolsDir = getCacheDir(devToolsDirPath, shouldCreate: false);
+      final dartSdkRoot = io.Platform.environment['DART_ROOT'] ?? '/usr/lib/dart';
+      final Directory devToolsDir = _fileSystem.directory(dartSdkRoot + '/bin/resources/devtools');
       if (!devToolsDir.existsSync()) {
         throw Exception('Could not find directory at ${devToolsDir.path}');
       }
@@ -721,7 +722,6 @@
   }
 
   void setStampFor(String artifactName, String version) {
-    getStampFileFor(artifactName).writeAsStringSync(version);
   }
 
   File getStampFileFor(String artifactName) {
@@ -1010,31 +1010,6 @@
   }
 
   Future<bool> checkForArtifacts(String? engineVersion) async {
-    engineVersion ??= version;
-    final url = '${cache.storageBaseUrl}/flutter_infra_release/flutter/$engineVersion/';
-
-    var exists = false;
-    for (final String pkgName in getPackageDirs()) {
-      exists = await cache.doesRemoteExist(
-        'Checking package $pkgName is available...',
-        Uri.parse('$url$pkgName.zip'),
-      );
-      if (!exists) {
-        return false;
-      }
-    }
-
-    for (final List<String> toolsDir in getBinaryDirs()) {
-      final String cacheDir = toolsDir[0];
-      final String urlPath = toolsDir[1];
-      exists = await cache.doesRemoteExist(
-        'Checking $cacheDir tools are available...',
-        Uri.parse(url + urlPath),
-      );
-      if (!exists) {
-        return false;
-      }
-    }
     return true;
   }