[dart:io] Namespaces for file IO

tests/standalone/io/namespace_test.dart

+// Copyright (c) 2017, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import "dart:async";
+import "dart:io";
+
+import "package:expect/expect.dart";
+
+const String file1str = "file1";
+
+void doTestSync() {
+  // Stuff that should exist.
+  Directory dir1 = new Directory("/dir1");
+  Directory dir2 = new Directory("/dir1/dir2");
+  File file1 = new File("/dir1/dir2/file1");
+
+  Expect.isTrue(dir1.existsSync());
+  Expect.isTrue(dir2.existsSync());
+  Expect.isTrue(file1.existsSync());
+  Expect.equals(file1str, file1.readAsStringSync());
+
+  // Relative paths since cwd of the namespace should be "/".
+  Directory dir1rel = new Directory("dir1");
+  Directory dir2rel = new Directory("dir1/dir2");
+  File file1rel = new File("dir1/dir2/file1");
+
+  Expect.equals("/", Directory.current.path);
+  Expect.isTrue(dir1rel.existsSync());
+  Expect.isTrue(dir2rel.existsSync());
+  Expect.isTrue(file1rel.existsSync());
+  Expect.equals(file1str, file1.readAsStringSync());
+
+  // Stuff that should not exist.
+  Expect.isFalse(new Directory("/tmp").existsSync());
+  Expect.isFalse(new File("/tmp").existsSync());
+  Expect.isFalse(new File(Platform.script.path).existsSync());
+  Expect.isFalse(new File(Platform.executable).existsSync());
+  Expect.isFalse(new File(Platform.resolvedExecutable).existsSync());
+
+  // File operations in the namespace.
+  // copy.
+  File file2 = file1.copySync("/file2");
+  Expect.isTrue(file2.existsSync());
+  Expect.equals(file1.readAsStringSync(), file2.readAsStringSync());
+  // create.
+  File file3 = new File("/file3")..createSync();
+  Expect.isTrue(file3.existsSync());
+  // last{Accessed,Modified}.
+  DateTime time = new DateTime.fromMillisecondsSinceEpoch(0);
+  file2.setLastAccessedSync(time);
+  file2.setLastModifiedSync(time);
+  Expect.equals(time, file2.lastAccessedSync());
+  Expect.equals(time, file2.lastModifiedSync());
+  Expect.equals(file1str.length, file2.lengthSync());
+  // open.
+  RandomAccessFile file2raf = file2.openSync();
+  Expect.equals(file1str.codeUnitAt(0), file2raf.readByteSync());
+  file2raf.closeSync();
+  // rename.
+  File file4 = new File("file4");
+  file3.renameSync(file4.path);
+  Expect.isFalse(file3.existsSync());
+  Expect.isTrue(file4.existsSync());
+  // delete.
+  file4.deleteSync();
+  Expect.isFalse(file4.existsSync());
+  // stat.
+  FileStat stat = file2.statSync();
+  Expect.equals(time, stat.modified);
+
+  // Directory operaions in the namespace.
+  // absolute.
+  Expect.equals(dir1.path, dir1rel.absolute.path);
+  // create
+  Directory dir3 = new Directory("/dir3");
+  dir3.createSync();
+  Expect.isTrue(dir3.existsSync());
+  // createTemp
+  Directory dir3temp = dir3.createTempSync();
+  Expect.isTrue(dir3temp.existsSync());
+  // listSync
+  List fses = Directory.current.listSync();
+  Expect.isTrue(fses.any((fse) => fse.path == dir3.path));
+  // rename.
+  Directory dir4 = new Directory("dir4");
+  dir3.renameSync(dir4.path);
+  Expect.isTrue(dir4.existsSync());
+  // delete.
+  dir4.deleteSync(recursive: true);
+  Expect.isFalse(dir4.existsSync());
+  // stat.
+  FileStat dirstat = dir2.statSync();
+  Expect.equals(FileSystemEntityType.DIRECTORY, dirstat.type);
+}
+
+doTestAsync() async {
+  // Stuff that should exist.
+  Directory dir1 = new Directory("/dir1");
+  Directory dir2 = new Directory("/dir1/dir2");
+  File file1 = new File("/dir1/dir2/file1");
+
+  Expect.isTrue(await dir1.exists());
+  Expect.isTrue(await dir2.exists());
+  Expect.isTrue(await file1.exists());
+  Expect.equals(file1str, await file1.readAsString());
+
+  // Relative paths since cwd of the namespace should be "/".
+  Directory dir1rel = new Directory("dir1");
+  Directory dir2rel = new Directory("dir1/dir2");
+  File file1rel = new File("dir1/dir2/file1");
+
+  Expect.equals("/", Directory.current.path);
+  Expect.isTrue(await dir1rel.exists());
+  Expect.isTrue(await dir2rel.exists());
+  Expect.isTrue(await file1rel.exists());
+  Expect.equals(file1str, await file1.readAsString());
+
+  // Stuff that should not exist.
+  Expect.isFalse(await new Directory("/tmp").exists());
+  Expect.isFalse(await new File("/tmp").exists());
+  Expect.isFalse(await new File(Platform.script.path).exists());
+  Expect.isFalse(await new File(Platform.executable).exists());
+  Expect.isFalse(await new File(Platform.resolvedExecutable).exists());
+
+  // File operations in the namespace.
+  // copy.
+  File file2 = await file1.copy("/file2");
+  Expect.isTrue(await file2.exists());
+  Expect.equals(await file1.readAsString(), await file2.readAsString());
+  // create.
+  File file3 = new File("/file3");
+  await file3.create();
+  Expect.isTrue(await file3.exists());
+  // last{Accessed,Modified}.
+  DateTime time = new DateTime.fromMillisecondsSinceEpoch(0);
+  await file2.setLastAccessed(time);
+  await file2.setLastModified(time);
+  Expect.equals(time, await file2.lastAccessed());
+  Expect.equals(time, await file2.lastModified());
+  Expect.equals(file1str.length, await file2.length());
+  // open.
+  RandomAccessFile file2raf = await file2.open();
+  Expect.equals(file1str.codeUnitAt(0), await file2raf.readByte());
+  await file2raf.close();
+  // rename.
+  File file4 = new File("file4");
+  await file3.rename(file4.path);
+  Expect.isFalse(await file3.exists());
+  Expect.isTrue(await file4.exists());
+  // delete.
+  await file4.delete();
+  Expect.isFalse(await file4.exists());
+  // stat.
+  FileStat stat = await file2.stat();
+  Expect.equals(time, stat.modified);
+
+  // Directory operaions in the namespace.
+  // absolute.
+  Expect.equals(dir1.path, dir1rel.absolute.path);
+  // create
+  Directory dir3 = new Directory("/dir3");
+  await dir3.create();
+  Expect.isTrue(await dir3.exists());
+  // createTemp
+  Directory dir3temp = await dir3.createTemp();
+  Expect.isTrue(await dir3temp.exists());
+  // listSync
+  List fses = await Directory.current.list().toList();
+  Expect.isTrue(fses.any((fse) => fse.path == dir3.path));
+  // rename.
+  Directory dir4 = new Directory("dir4");
+  dir3.renameSync(dir4.path);
+  Expect.isTrue(await dir4.exists());
+  // delete.
+  dir4.deleteSync(recursive: true);
+  Expect.isFalse(await dir4.exists());
+  // stat.
+  FileStat dirstat = await dir2.stat();
+  Expect.equals(FileSystemEntityType.DIRECTORY, dirstat.type);
+}
+
+List<String> packageOptions() {
+  if (Platform.packageRoot != null) {
+    return <String>["--package-root=${Platform.packageRoot}"];
+  } else if (Platform.packageConfig != null) {
+    return <String>["--packages=${Platform.packageConfig}"];
+  } else {
+    return <String>[];
+  }
+}
+
+void setupTest() {
+  // Create a namespace in /tmp.
+  Directory namespace = Directory.systemTemp.createTempSync("namespace");
+  try {
+    // Create some stuff that should be visible.
+    Directory dir1 = new Directory("${namespace.path}/dir1")..createSync();
+    Directory dir2 = new Directory("${dir1.path}/dir2")..createSync();
+    File file1 = new File("${dir2.path}/file1")..createSync()
+                                          ..writeAsStringSync(file1str);
+
+    // Run the test and capture stdout.
+    var args = packageOptions();
+    args.addAll([
+      "--namespace=${namespace.path}",
+      Platform.script.toFilePath(),
+      "--run"
+    ]);
+    var pr = Process.runSync(Platform.executable, args);
+    if (pr.exitCode != 0) {
+      print("stdout:\n${pr.stdout}");
+      print("stderr:\n${pr.stderr}");
+    }
+    Expect.equals(0, pr.exitCode);
+  } finally {
+    namespace.deleteSync(recursive: true);
+  }
+}
+
+main(List<String> arguments) async {
+  if (!Platform.isLinux) {
+    return;
+  }
+  if (arguments.contains("--run")) {
+    doTestSync();
+    await doTestAsync();
+  } else {
+    setupTest();
+  }
+}