Recommit add FileSystemEntity.resolveSymbolicLinks

tests/standalone/io/resolve_symbolic_links_test.dart

+// Copyright (c) 2013, 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.
+//
+// Dart test program for testing FileSystemEntity.resolveSymbolicLinks
+
+import "package:expect/expect.dart";
+import "package:path/path.dart";
+import "package:async_helper/async_helper.dart";
+import 'dart:async';
+import 'dart:io';
+
+main() {
+  String testsDir = dirname(dirname(dirname(Platform.script)));
+  // All of these tests test that resolveSymbolicLinks gives a path
+  // that points to the same place as the original, and that it removes
+  // all links, .., and . segments, and that it produces an absolute path.
+  asyncTest(() => testFile(join(
+      testsDir, 'standalone', 'io', 'resolve_symbolic_links_test.dart')));
+  asyncTest(() => testFile(join(testsDir, 'standalone', 'io', '..', 'io',
+                                'resolve_symbolic_links_test.dart')));
+
+  asyncTest(() => testDir(join(testsDir, 'standalone', 'io')));
+  asyncTest(() => testDir(join(testsDir, 'lib', '..', 'standalone', 'io')));
+  // Test a relative path.
+  asyncTest(() => testDir('.'));
+  if (Platform.isWindows) {
+    asyncTest(() =>testFile(join('\\\\?\\$testsDir', 'standalone', 'io',
+                                 'resolve_symbolic_links_test.dart')));
+    asyncTest(() => testDir('\\\\?\\$testsDir'));
+  }
+  asyncTest(() => new Directory('').createTemp().then((tempDir) {
+    String temp = tempDir.path;
+    return makeEntities(temp).then((_) => Future.wait(
+        [testFile(join(temp, 'dir1', 'file1')),
+         testFile(join(temp, 'link1', 'file2')),
+         testDir(join(temp, 'dir1', 'dir2', '..', '.', '..', 'dir1')),
+         testDir(join(temp, 'dir1', 'dir2', '..', '.', '..', 'dir1')),
+         testLink(join(temp, 'link1'))]))
+    .then((_) {
+      if (Platform.isWindows) {
+        // Windows applies '..' to a link without resolving the link first.
+        return Future.wait([
+            testFile(join(
+                temp, 'dir1', '..', 'link1', '..', 'dir1', 'dir2', 'file2')),
+            testDir(join(temp, 'dir1', '..', 'link1', '..', 'dir1')),
+            testLink(join(temp, 'link1', '..', 'link1'))]);
+      } else {
+       // Non-Windows platforms resolve the link before adding the '..'.
+        return Future.wait([
+            testFile(join(
+                temp, 'dir1', '..', 'link1', '..', 'dir2', 'file2')),
+            testDir(join(temp, 'dir1', '..', 'link1', '..', 'dir2')),
+            testLink(join(temp, 'link1', '..', '..', 'link1'))]);
+      }
+    })
+    .then((_) {
+      Directory.current = temp;
+      return Future.wait([
+          testFile('dir1/dir2/file2'),  // Test forward slashes on Windows too.
+          testFile('link1/file2'),
+          testFile(join('dir1', '..', 'dir1', '.', 'file1')),
+          testDir('.'),
+          testLink('link1')]);
+    })
+    .then((_) {
+      Directory.current = 'link1';
+      if (Platform.isWindows) {
+        return Future.wait([
+          testFile('file2'),
+          // Windows applies '..' to a link without resolving the link first.
+          testFile('..\\dir1\\file1'),
+          testLink('.'),
+          testDir('..'),
+          testLink('..\\link1')]);
+      } else {
+        return Future.wait([
+          testFile('file2'),
+          // On non-Windows the link is changed to dir1/dir2 before .. happens.
+          testFile('../dir2/file2'),
+          testDir('.'),
+          testDir('..'),
+          testLink('../../link1')]);
+      }
+    })
+    .whenComplete(() {
+      Directory.current = testsDir;
+      tempDir.delete(recursive: true);
+    });
+  }));
+}
+
+Future makeEntities(String temp) {
+  return new Directory(join(temp, 'dir1', 'dir2')).create(recursive: true)
+      .then((_) => new File(join(temp, 'dir1', 'dir2', 'file2')).create())
+      .then((_) => new File(join(temp, 'dir1', 'file1')).create())
+      .then((_) => new Link(join(temp, 'link1'))
+            .create(join(temp, 'dir1', 'dir2')));
+}
+
+Future testFile(String name) {
+  // We test that f.resolveSymbolicLinks points to the same place
+  // as f, because the actual resolved path is not easily predictable.
+  // The location of the temp directory varies from system to system,
+  // and its path includes symbolic links on some systems.
+  //Expect.isTrue(FileSystemEntity.identicalSync(name,
+  //   new File(name).resolveSymbolicLinksSync()));
+  return new File(name).resolveSymbolicLinks().then((String resolved) {
+  //Expect.isTrue(FileSystemEntity.identicalSync(name, resolved));
+    Expect.isTrue(isAbsolute(resolved));
+    // Test that resolveSymbolicLinks removes all links, .., and . segments.
+    Expect.isFalse(resolved.contains('..'));
+    Expect.isFalse(resolved.contains('./'));
+    Expect.isFalse(resolved.contains('link1'));
+  });
+}
+
+Future testDir(String name) {
+  Expect.isTrue(FileSystemEntity.identicalSync(name,
+      new Directory(name).resolveSymbolicLinksSync()));
+  return new Directory(name).resolveSymbolicLinks().then((String resolved) {
+    Expect.isTrue(FileSystemEntity.identicalSync(name, resolved));
+    Expect.isTrue(isAbsolute(resolved));
+    // Test that resolveSymbolicLinks removes all links, .., and . segments.
+    Expect.isFalse(resolved.contains('..'));
+    Expect.isFalse(resolved.contains('./'));
+    Expect.isFalse(resolved.contains('link1'));
+  });
+}
+
+Future testLink(String name) {
+  Expect.isFalse(FileSystemEntity.identicalSync(name,
+      new Link(name).resolveSymbolicLinksSync()));
+  Expect.isTrue(FileSystemEntity.identicalSync(new Link(name).targetSync(),
+      new Link(name).resolveSymbolicLinksSync()));
+  return new Link(name).resolveSymbolicLinks().then((String resolved) {
+    Expect.isFalse(FileSystemEntity.identicalSync(name, resolved));
+    Expect.isTrue(isAbsolute(resolved));
+    // Test that resolveSymbolicLinks removes all links, .., and . segments.
+    Expect.isFalse(resolved.contains('..'));
+    Expect.isFalse(resolved.contains('./'));
+    Expect.isFalse(resolved.contains('link1'));
+    return new Link(name).target()
+        .then((targetName) => FileSystemEntity.identical(targetName, resolved))
+        .then((identical) => Expect.isTrue(identical));
+  });
+}