adds file path source to pub

utils/pub/io.dart

Index: utils/pub/io.dart
diff --git a/utils/pub/io.dart b/utils/pub/io.dart
index b227378a28f552f3c541967d640d76d219dd0229..704d3d1e68525ddab0de45a5c5dd0357230d6286 100644
--- a/utils/pub/io.dart
+++ b/utils/pub/io.dart
@@ -398,7 +398,9 @@ Future<File> createSymlink(from, to) {
 Future<File> createPackageSymlink(String name, from, to,
     {bool isSelfLink: false}) {
   // See if the package has a "lib" directory.
-  from = join(from, 'lib');
+  // Note(Sam): Relative paths causes issues when cwd is different.
+  //            also, absolute paths are safer when app is moved around.
+  from = getFullPath(join(from, 'lib'));
   return dirExists(from).then((exists) {
     log.fine("Creating ${isSelfLink ? "self" : ""}link for package '$name'.");
     if (exists) return createSymlink(from, to);