The patch below got ZDebug working with Zope 2.3.0 for me. Hope I didn't
miss anything ;-)

cheers,

Chris

--- debugsecuritypolicy.py.old Sun Jan 28 21:59:23 2001
+++ debugsecuritypolicy.py Sun Jan 28 22:07:21 2001
@@ -89,7 +89,7 @@
 __version__='$Revision: 1.4 $'[11:-2]

 from AccessControl import SimpleObjectPolicies
-_noroles=[]
+_noroles=SimpleObjectPolicies._noroles

 from AccessControl.PermissionRole import \
      _what_not_even_god_should_do, rolesForPermissionOn
@@ -99,7 +99,7 @@
 class DebugSecurityPolicy:

     def validate(self, accessed, container, name, value, context,
-                 None=None, type=type, IntType=type(0), DictType=type({}),
+                 roles=_noroles, None=None, type=type, IntType=type(0),
DictType=type({}),
                  getattr=getattr, _noroles=_noroles, StringType=type(''),
                  Containers=SimpleObjectPolicies.Containers,
                  valid_aq_=('aq_parent','aq_explicit')):
@@ -116,7 +116,8 @@

         ############################################################
         # Try to get roles
-        roles=getattr(value, '__roles__', _noroles)
+        if roles is _noroles:
+            roles=getattr(value, '__roles__', _noroles)

         if roles is _noroles:

@@ -174,7 +175,14 @@
             value=container

         # Short-circuit tests if we can:
-        if roles is None or 'Anonymous' in roles: return 1
+        try:
+            if roles is None or 'Anonymous' in roles: return 1
+        except TypeError:
+            # 'roles' isn't a sequence
+            LOG('Zope Security Policy', PROBLEM, "'%s' passed as roles"
+                " during validation of '%s' is not a sequence." % (
+                `roles`, name))
+            raise

         # Check executable security
         stack=context.stack



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