faster argcheck

koji/util.py

@@ -132,16 +132,16 @@ def dslice(dict, keys, strict=True):
             ret[key] = dict[key]
     return ret
 
-def call_with_argcheck(func, args, kwargs):
+def call_with_argcheck(func, args, kwargs={}):
     """Call function, raising ParameterError if args do not match"""
     try:
         return func(*args, **kwargs)
     except TypeError, e:
-        tb = sys.exc_info()[2]
-        while tb.tb_next:
-            tb = tb.tb_next
-        if tb.tb_frame.f_code == call_with_argcheck.func_code:
-            raise koji.ParameterError, e.message
+        if sys.exc_info()[2].tb_next is None:
+            # The stack is only one high, so the error occurred in this function.
+            # Therefore, we assume the TypeError is due to a parameter mismatch
+            # in the above function call.
+            raise koji.ParameterError, str(e)
         raise