Move CurlClient to Pub so that it can access resources.

utils/pub/io.dart

 // Copyright (c) 2012, 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.
 
 /**
  * Helper functionality to make working with IO easier.
  */
 library io;
 
 import 'dart:io';
@@ skipping 517 matching lines @@
     return true;
   });
   input.then((value) {
     if (completer.future.isComplete) return;
     timer.cancel();
     completer.complete(value);
   });
   return completer.future;
 }
 
+/// Creates a temporary directory and passes its path to [fn]. Once the [Future]
+/// returned by [fn] completes, the temporary directory and all its contents
+/// will be deleted.
+Future withTempDir(Future fn(String path)) {
+  var tempDir;
+  var future = new Directory('').createTemp().chain((dir) {
+    tempDir = dir;
+    return fn(tempDir.path);
+  });
+  future.onComplete((_) => tempDir.delete(recursive: true));
+  return future;
+}
+
 /// Tests whether or not the git command-line app is available for use.
 Future<bool> get isGitInstalled {
   if (_isGitInstalledCache != null) {
     // TODO(rnystrom): The sleep is to pump the message queue. Can use
     // Future.immediate() when #3356 is fixed.
     return sleep(0).transform((_) => _isGitInstalledCache);
   }
 
   return _gitCommand.transform((git) => git != null);
 }
@@ skipping 198 matching lines @@
   return new Directory(entry);
 }
 
 /**
  * Gets a [Uri] for [uri], which can either already be one, or be a [String].
  */
 Uri _getUri(uri) {
   if (uri is Uri) return uri;
   return new Uri.fromString(uri);
 }