X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=sfa%2Ftrust%2Fauth.py;fp=sfa%2Ftrust%2Fauth.py;h=0a2b3ce0b2d140c661d4678ca7da3c779902315b;hb=7e021cc4efc2b7b0523716b5b536121f4ce29bc9;hp=0b4d3372ec95f25b62cb7a144e4a1348bb17f607;hpb=f1d5fa1c83d7507170e28d7c7a5c9676744420b9;p=sfa.git

diff --git a/sfa/trust/auth.py b/sfa/trust/auth.py
index 0b4d3372..0a2b3ce0 100644
--- a/sfa/trust/auth.py
+++ b/sfa/trust/auth.py
@@ -36,8 +36,11 @@ class Auth:
         self.trusted_cert_list = TrustedRoots(self.config.get_trustedroots_dir()).get_list()
         self.trusted_cert_file_list = TrustedRoots(self.config.get_trustedroots_dir()).get_file_list()
 
-    def checkCredentials(self, creds, operation, xrns=[], check_sliver_callback=None, speaking_for_hrn=None):
-
+    # do not use mutable as default argument 
+    # http://docs.python-guide.org/en/latest/writing/gotchas/#mutable-default-arguments
+    def checkCredentials(self, creds, operation, xrns=None, 
+                         check_sliver_callback=None, speaking_for_hrn=None):
+        if xrns is None: xrns=[]
         def log_invalid_cred(cred):
             cred_obj=Credential(string=cred)
             logger.debug("failed to validate credential - dump=%s"%cred_obj.dump_string(dump_parents=True))