Don't remove tmp from parts on startup. Doing so causes problems when

running layers in separate parallel processes.

buildout.cfg

@@ -7,11 +7,9 @@ find-links = http://download.zope.org/distribution/
 recipe = zc.recipe.testrunner
 eggs = ZODB3
 initialization = 
-  import os, tempfile, shutil, stat
-  [[os.chmod(os.path.join(path, f), stat.S_IWUSR) for f in files]
-    for (path, dirs, files) in os.walk('tmp')]
-  if os.path.exists('tmp'): shutil.rmtree('tmp')
-  os.mkdir('tmp')
+  import os, tempfile
+  try: os.mkdir('tmp')
+  except: pass
   tempfile.tempdir = os.path.abspath('tmp')
 
 [scripts]