Write binstubs using the system encoding.

lib/src/global_packages.dart

 // Copyright (c) 2014, 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.
 
 library pub.global_packages;
 
 import 'dart:async';
+import 'dart:convert';
 import 'dart:io';
 
 import 'package:path/path.dart' as p;
 import 'package:barback/barback.dart';
 import 'package:pub_semver/pub_semver.dart';
 
 import 'barback/asset_environment.dart';
 import 'entrypoint.dart';
 import 'exceptions.dart';
 import 'executable.dart' as exe;
@@ skipping 669 matching lines @@
 # If it is, we need to delete it and run "pub global" manually.
 exit_code=\$?
 if [ \$exit_code != 253 ]; then
   exit \$exit_code
 fi
 
 pub global run ${package.name}:$script "\$@"
 """;
       }
 
-      writeTextFile(binStubPath, bash);
+      // Write this as the system encoding since the system is going to execute
+      // it and it might contain non-ASCII caharacters in the pathnames.
+      writeTextFile(binStubPath, bash, encoding: const SystemEncoding());
 
       // Make it executable.
       var result = Process.runSync('chmod', ['+x', binStubPath]);
       if (result.exitCode != 0) {
         // Couldn't make it executable so don't leave it laying around.
         try {
           deleteEntry(binStubPath);
         } on IOException catch (err) {
           // Do nothing. We're going to fail below anyway.
           log.fine("Could not delete binstub:\n$err");
@@ skipping 67 matching lines @@
   }
 
   /// Returns the value of the property named [name] in the bin stub script
   /// [source].
   String _binStubProperty(String source, String name) {
     var pattern = new RegExp(quoteRegExp(name) + r": ([a-zA-Z0-9_-]+)");
     var match = pattern.firstMatch(source);
     return match == null ? null : match[1];
   }
 }