[test] Clobber unclean test262-es6 checkouts.

test/test262-es6/testcfg.py

 # Copyright 2012 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 #       copyright notice, this list of conditions and the following
 #       disclaimer in the documentation and/or other materials provided
@@ skipping 113 matching lines @@
     if output.exit_code != 0:
       return True
     return "FAILED!" in output.stdout
 
   def DownloadData(self):
     revision = TEST_262_ARCHIVE_REVISION
     archive_url = TEST_262_URL % revision
     archive_name = os.path.join(self.root, "tc39-test262-%s.tar.gz" % revision)
     directory_name = os.path.join(self.root, "data")
     directory_old_name = os.path.join(self.root, "data.old")
+
+    # Clobber if the test is in an outdated state, i.e. if there are any other
+    # archive files present.
+    archive_files = [f for f in os.listdir(self.root)
+                     if f.startswith("tc39-test262-")]
+    if len(archive_files) > 1 or archive_name not in archive_files:
+      print "Clobber outdated test archives ..."
+      for f in archive_files:
+        os.remove(os.path.join(self.root, f))
+
     if not os.path.exists(archive_name):
       print "Downloading test data from %s ..." % archive_url
       utils.URLRetrieve(archive_url, archive_name)
       if os.path.exists(directory_name):
         if os.path.exists(directory_old_name):
           shutil.rmtree(directory_old_name)
         os.rename(directory_name, directory_old_name)
     if not os.path.exists(directory_name):
       print "Extracting test262-%s.tar.gz ..." % revision
       md5 = hashlib.md5()
@@ skipping 10 matching lines @@
         # Magic incantation to allow longer path names on Windows.
         archive.extractall(u"\\\\?\\%s" % self.root)
       else:
         archive.extractall(self.root)
       os.rename(os.path.join(self.root, "tc39-test262-%s" % revision),
                 directory_name)
 
 
 def GetSuite(name, root):
   return Test262TestSuite(name, root)