When the tree is closed, it's closed.

presubmit_canned_checks.py

Index: presubmit_canned_checks.py
diff --git a/presubmit_canned_checks.py b/presubmit_canned_checks.py
index 52081912b6665a23edaafe5d7c32991b6d998192..901a755ada410dfab7abd7868e37478dc06ad5ac 100644
--- a/presubmit_canned_checks.py
+++ b/presubmit_canned_checks.py
@@ -352,8 +352,8 @@ def CheckTreeIsOpen(input_api, output_api, url, closed):
     connection.close()
     if input_api.re.match(closed, status):
       long_text = status + '\n' + url
-      return [output_api.PresubmitPromptWarning('The tree is closed.',
-                                                long_text=long_text)]
+      return [output_api.PresubmitError('The tree is closed dude!',
+                                        long_text=long_text)]
   except IOError:
     pass
   return []