[Swarming] Correctly handle test262 archiving for local checkouts.

test/test262/testcfg.py

Index: test/test262/testcfg.py
diff --git a/test/test262/testcfg.py b/test/test262/testcfg.py
index 9da8f4efa4b5548783cd0a9433bd794acca21002..7b7001310b5513193faec824951daa5dede29068 100644
--- a/test/test262/testcfg.py
+++ b/test/test262/testcfg.py
@@ -39,7 +39,8 @@ from testrunner.local import testsuite
 from testrunner.local import utils
 from testrunner.objects import testcase
 
-ARCHIVE = os.path.join(os.path.dirname(os.path.abspath(__file__)), "data.tar")
+DATA = os.path.join(os.path.dirname(os.path.abspath(__file__)), "data")
+ARCHIVE = DATA + ".tar"
 
 TEST_262_HARNESS_FILES = ["sta.js", "assert.js"]
 
@@ -203,7 +204,7 @@ class Test262TestSuite(testsuite.TestSuite):
 
     # The archive is created only on swarming. Local checkouts have the
     # data folder.
-    if os.path.exists(ARCHIVE):
+    if os.path.exists(ARCHIVE) and not os.path.exists(DATA):
       print "Extracting archive..."
       tar = tarfile.open(ARCHIVE)
       tar.extractall(path=os.path.dirname(ARCHIVE))