[flutter_tools] add working directory to ProcessException when pub get fails (#91436)

packages/flutter_tools/lib/src/dart/pub.dart

@@ -263,6 +263,25 @@ class _DefaultPub implements Pub {
     // The exception is rethrown, so don't catch only Exceptions.
     } catch (exception) { // ignore: avoid_catches_without_on_clauses
       status?.cancel();
+      if (exception is io.ProcessException) {
+        final StringBuffer buffer = StringBuffer(exception.message);
+        buffer.writeln('Working directory: "$directory"');
+        final Map<String, String> env = await _createPubEnvironment(context, flutterRootOverride);
+        if (env.entries.isNotEmpty) {
+          buffer.writeln('pub env: {');
+          for (final MapEntry<String, String> entry in env.entries) {
+            buffer.writeln('  "${entry.key}": "${entry.value}",');
+          }
+          buffer.writeln('}');
+        }
+
+        throw io.ProcessException(
+          exception.executable,
+          exception.arguments,
+          buffer.toString(),
+          exception.errorCode,
+        );
+      }
       rethrow;
     }
 

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

@@ -8,6 +8,7 @@ import 'package:file/memory.dart';
 import 'package:flutter_tools/src/base/bot_detector.dart';
 import 'package:flutter_tools/src/base/common.dart';
 import 'package:flutter_tools/src/base/file_system.dart';
+import 'package:flutter_tools/src/base/io.dart' show ProcessException;
 import 'package:flutter_tools/src/base/logger.dart';
 import 'package:flutter_tools/src/base/platform.dart';
 import 'package:flutter_tools/src/cache.dart';
@@ -688,6 +689,68 @@ void main() {
     expect(processManager, hasNoRemainingExpectations);
   });
 
+  testWithoutContext('pub get shows working directory on process exception', () async {
+    final BufferLogger logger = BufferLogger.test();
+    final FileSystem fileSystem = MemoryFileSystem.test();
+
+    final FakeProcessManager processManager = FakeProcessManager.list(<FakeCommand>[
+      FakeCommand(
+        command: const <String>[
+          'bin/cache/dart-sdk/bin/dart',
+          '__deprecated_pub',
+          '--verbosity=warning',
+          'get',
+          '--no-precompile',
+        ],
+        onRun: () {
+          throw const ProcessException(
+            'bin/cache/dart-sdk/bin/dart',
+            <String>[
+              '__deprecated_pub',
+              '--verbosity=warning',
+              'get',
+              '--no-precompile',
+            ],
+            'message',
+            1,
+          );
+        },
+        exitCode: 66,
+        stderr: 'err1\nerr2\nerr3\n',
+        stdout: 'out1\nout2\nout3\n',
+        environment: const <String, String>{'FLUTTER_ROOT': '', 'PUB_ENVIRONMENT': 'flutter_cli:flutter_tests'},
+      ),
+    ]);
+
+    final Pub pub = Pub(
+      platform: FakePlatform(environment: const <String, String>{}),
+      fileSystem: fileSystem,
+      logger: logger,
+      usage: TestUsage(),
+      botDetector: const BotDetectorAlwaysNo(),
+      processManager: processManager,
+    );
+    await expectLater(
+      () => pub.get(context: PubContext.flutterTests),
+      throwsA(
+        isA<ProcessException>().having(
+          (ProcessException error) => error.message,
+          'message',
+          contains('Working directory: "/"'),
+        ).having(
+          (ProcessException error) => error.message,
+          'message',
+          contains('"PUB_ENVIRONMENT": "flutter_cli:flutter_tests"'),
+        ),
+      ),
+    );
+    expect(logger.statusText,
+      'Running "flutter pub get" in /...\n'
+    );
+    expect(logger.errorText, isEmpty);
+    expect(processManager, hasNoRemainingExpectations);
+  });
+
   testWithoutContext('pub cache in root is used', () async {
     String? error;
     final FileSystem fileSystem = MemoryFileSystem.test();