Recipe package system.

PRESUBMIT.py

Index: PRESUBMIT.py
diff --git a/PRESUBMIT.py b/PRESUBMIT.py
new file mode 100755
index 0000000000000000000000000000000000000000..e0887978786b5ecd85ba6eed93f335cb78d4cc54
--- /dev/null
+++ b/PRESUBMIT.py
@@ -0,0 +1,20 @@
+#!/usr/bin/env python
+
+import os
+import re
+import subprocess
+import sys
+
+def CommonChecks(input_api, output_api):
+  def tests(*path):
+    return input_api.canned_checks.GetUnitTestsInDirectory(
+        input_api,
+        output_api,
+        input_api.os_path.join(*path),
+        whitelist=[r'.+_test\.py'])
+  return input_api.RunTests(
+      tests('recipe_engine', 'unittests') +
+      tests('unittests'))
+
+CheckChangeOnUpload = CommonChecks
+CheckChangeOnCommit = CommonChecks