Use temporary eclipse workspace directories for DartEditor tests

tools/bots/editor.py

 #!/usr/bin/python
 # 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 os
+import shutil
 import sys
+import tempfile
 
 import bot
 
+class TempDir(object):
+  def __enter__(self):
+    self._temp_dir = tempfile.mkdtemp('eclipse-workspace')
+    return self._temp_dir
+
+  def __exit__(self, *_):
+    shutil.rmtree(self._temp_dir, ignore_errors = True)
+
 def GetEditorExecutable(mode, arch):
   configuration_dir = mode + arch.upper()
   linux_path = os.path.join('out', configuration_dir, 'editor')
   win_path = os.path.join('build', configuration_dir, 'editor')
   mac_path = os.path.join('xcodebuild', configuration_dir, 'editor')
 
   if sys.platform == 'darwin':
     executable = os.path.join('DartEditor.app', 'Contents', 'MacOS',
                               'DartEditor')
     # TODO(kustermann,ricow): Maybe we're able to get rid of this in the future.
@@ skipping 22 matching lines @@
     with bot.BuildStep('Build Editor %s' % arch):
       args = [sys.executable, build_py,
               '-mrelease', '--arch=%s' % arch, 'editor']
       print 'Running: %s' % (' '.join(args))
       sys.stdout.flush()
       bot.RunProcess(args)
 
   for arch in test_architectures:
     editor_executable = GetEditorExecutable('Release', arch)
     with bot.BuildStep('Test Editor %s' % arch):
-      args = [editor_executable, '--test', '--auto-exit']
-      print 'Running: %s' % (' '.join(args))
-      sys.stdout.flush()
-      bot.RunProcess(args)
+      with TempDir() as temp_dir:
+        args = [editor_executable, '--test', '--auto-exit', '-data', temp_dir]
+        print 'Running: %s' % (' '.join(args))
+        sys.stdout.flush()
+        bot.RunProcess(args)
   return 0
 
 if __name__ == '__main__':
   try:
     sys.exit(main())
   except OSError as e:
     sys.exit(e.errno)