Pass absolute path to 'git clone'.

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';
 import 'dart:isolate';
 import 'dart:uri';
 
 import 'utils.dart';
 
 bool _isGitInstalledCache;
 
 /// The cached Git command.
 String _gitCommandCache;
 
 /** Gets the current working directory. */
-String get workingDir => new File('.').fullPathSync();
+String get workingDir => getFullPath('.');
 
 const Pattern NEWLINE_PATTERN = const RegExp("\r\n?|\n\r?");
 
 /**
  * Prints the given string to `stderr` on its own line.
  */
 void printError(value) {
   stderr.writeString(value.toString());
   stderr.writeString('\n');
 }
@@ skipping 609 matching lines @@
 
 Future<bool> _extractTarGzWindows(InputStream stream, String destination) {
   // TODO(rnystrom): In the repo's history, there is an older implementation of
   // this that does everything in memory by piping streams directly together
   // instead of writing out temp files. The code is simpler, but unfortunately,
   // 7zip seems to periodically fail when we invoke it from Dart and tell it to
   // read from stdin instead of a file. Consider resurrecting that version if
   // we can figure out why it fails.
 
   // Find 7zip.
-  var scriptPath = new File(new Options().script).fullPathSync();
+  var scriptPath = getFullPath(new Options().script);
   var scriptDir = new Path.fromNative(scriptPath).directoryPath;
 
   // Note: This line of code gets munged by create_sdk.py to be the correct
   // relative path to 7zip in the SDK.
   var pathTo7zip = '../../third_party/7zip/7za.exe';
   var command = scriptDir.append(pathTo7zip).canonicalize().toNativePath();
 
   var tempDir;
 
   return createTempDir().chain((temp) {
@@ skipping 98 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);
 }