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[flutter_tools] handle OSError 2 from current working directory (#78380)

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Jonah Williams 2021-03-18 09:49:25 -07:00 committed by GitHub
parent e2bbdb97e2
commit cdfe39556b
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2 changed files with 31 additions and 5 deletions
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21
packages/flutter_tools/lib/src/base/error_handling_io.dart
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@ -24,6 +24,10 @@ import 'platform.dart';
// ToolExit and a message that is more clear than the FileSystemException by
// itself.
/// On windows this is error code 2: ERROR_FILE_NOT_FOUND, and on
/// macOS/Linux it is error code 2/ENOENT: No such file or directory.
const int kSystemCannotFindFile = 2;
/// A [FileSystem] that throws a [ToolExit] on certain errors.
///
/// If a [FileSystem] error is not caused by the Flutter tool, and can only be
@ -83,10 +87,6 @@ class ErrorHandlingFileSystem extends ForwardingFileSystem {
// Certain error codes indicate the file could not be found. It could have
// been deleted by a different program while the tool was running.
// if it still exists, the file likely exists on a read-only volume.
//
// On windows this is error code 2: ERROR_FILE_NOT_FOUND, and on
// macOS/Linux it is error code 2/ENOENT: No such file or directory.
const int kSystemCannotFindFile = 2;
if (err?.osError?.errorCode != kSystemCannotFindFile || _noExitOnFailure) {
rethrow;
}
@ -105,7 +105,18 @@ class ErrorHandlingFileSystem extends ForwardingFileSystem {
@override
Directory get currentDirectory {
return _runSync(() => directory(delegate.currentDirectory), platform: _platform);
try {
return _runSync(() => directory(delegate.currentDirectory), platform: _platform);
} on FileSystemException catch (err) {
// Special handling for OS error 2 for current directory only.
if (err.osError.errorCode == kSystemCannotFindFile) {
throwToolExit(
'Unable to read current working directory. This can happen if the directory the '
'Flutter tool was run from was moved or deleted.'
);
}
rethrow;
}
}
@override

15
packages/flutter_tools/test/general.shard/base/error_handling_io_test.dart
View File

@ -8,6 +8,7 @@ import 'dart:io' as io; // ignore: dart_io_import;
import 'package:file/file.dart';
import 'package:file/memory.dart';
import 'package:file_testing/file_testing.dart';
import 'package:flutter_tools/src/base/common.dart';
import 'package:flutter_tools/src/base/error_handling_io.dart';
import 'package:flutter_tools/src/base/file_system.dart';
@ -370,6 +371,7 @@ void main() {
const int eperm = 1;
const int enospc = 28;
const int eacces = 13;
MockFileSystem mockFileSystem;
ErrorHandlingFileSystem fs;
@ -475,6 +477,19 @@ void main() {
expect(() => directory.existsSync(),
throwsToolExit(message: expectedMessage));
});
testWithoutContext('When the current working directory disappears', () async {
setupReadMocks(
mockFileSystem: mockFileSystem,
fs: fs,
errorCode: kSystemCannotFindFile,
);
expect(() => fs.currentDirectory, throwsToolExit(message: 'Unable to read current working directory'));
// Error is not caught by other operations.
expect(() => fs.file('foo').readAsStringSync(), throwsFileSystemException(kSystemCannotFindFile));
});
});
group('throws ToolExit on macOS', () {