[flutter_tools] handle ERROR_INVALID_FUNCTION when trying to symlink …

…across drives (#136681)

CP of 9751fe6
Original issue: #66224
CP Request: #136680

packages/flutter_tools/lib/src/flutter_plugins.dart

@@ -1035,6 +1035,14 @@ void handleSymlinkException(FileSystemException e, {
           : 'You must build from a terminal run as administrator.';
       throwToolExit('Building with plugins requires symlink support.\n\n$instructions');
     }
+    // ERROR_INVALID_FUNCTION, trying to link across drives, which is not supported
+    if (e.osError?.errorCode == 1) {
+      throwToolExit(
+        'Creating symlink from $source to $destination failed with '
+        'ERROR_INVALID_FUNCTION. Try moving your Flutter project to the same '
+        'drive as your Flutter SDK.',
+      );
+    }
   }
 }
 

packages/flutter_tools/test/general.shard/plugins_test.dart

@@ -1690,6 +1690,24 @@ flutter:
       );
     });
 
+    testWithoutContext('Symlink failures instruct developers to have their project on the same drive as their SDK', () async {
+      final Platform platform = FakePlatform(operatingSystem: 'windows');
+      final FakeOperatingSystemUtils os = FakeOperatingSystemUtils('Microsoft Windows [Version 10.0.14972]');
+
+      const FileSystemException e = FileSystemException('', '', OSError('', 1));
+
+      expect(
+        () => handleSymlinkException(
+          e,
+          platform: platform,
+          os: os,
+          source: pubCachePath,
+          destination: ephemeralPackagePath,
+        ),
+        throwsToolExit(message: 'Try moving your Flutter project to the same drive as your Flutter SDK'),
+      );
+    });
+
     testWithoutContext('Symlink failures only give instructions for specific errors', () async {
       final Platform platform = FakePlatform(operatingSystem: 'windows');
       final FakeOperatingSystemUtils os = FakeOperatingSystemUtils('Microsoft Windows [Version 10.0.14393]');