dart:io | Ensure that Directory.list terminates even when symbolic links create loops in the file s…

tests/standalone/io/link_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.
 
 import "package:expect/expect.dart";
 import "dart:async";
 import "dart:io";
 import "dart:isolate";
 
 // Test the dart:io Link class.
@@ skipping 119 matching lines @@
             }
             f.complete(null);
           });
     }
   }
   Future.wait(futures).then((_) {
     baseDir.deleteSync(recursive: true);
   });
 }
 
+testCreateLoopingLink() {
+  Path base = new Path(new Directory('').createTempSync().path);
+  new Directory.fromPath(base.append('a/b/c')).create(recursive: true)
+  .then((_) =>
+    new Link.fromPath(base.append('a/b/c/d'))
+        .create(base.append('a/b').toNativePath()))
+  .then((_) =>
+    new Link.fromPath(base.append('a/b/c/e'))
+        .create(base.append('a').toNativePath()))
+  .then((_) =>
+    new Directory.fromPath(base.append('a'))
+        .list(recursive: true,followLinks: false)

[Søren Gjesse, 2013/04/10 11:33:23]

space after ,

[Bill Hesse, 2013/04/10 12:49:47]

Done.

+        .last)
+  .then((_) =>
+    // This directory listing must terminate, even though it contains loops.
+    new Directory.fromPath(base.append('a'))
+        .list(recursive: true,followLinks: true)

[Søren Gjesse, 2013/04/10 11:33:23]

ditto.

+        .last)
+  .then((_) =>
+    // This directory listing must terminate, even though it contains loops.
+    new Directory.fromPath(base.append('a/b/c'))
+        .list(recursive: true, followLinks: true)
+        .last)
+  .then((_) =>
+    new Directory.fromPath(base).delete(recursive: true));
+}
 
 main() {
   testCreateSync();
+  testCreateLoopingLink();
 }