patches: make Shared.DC.Scripts.Bindings a new style class

This backports parts of zope commit bb7837c66 (Explicitly make all
classes new-style., 2017-09-15) and 173658008 (Fix unpickling of instances
those base class changed to a new-style class. (#208), 2017-10-24),
so that business template is same between zope4 and zope2 and so that
business templates created with zope4 can still be installed on zope2.

product/ERP5Type/ZopePatch.py

@@ -99,6 +99,7 @@ from Products.ERP5Type.patches import users
 from Products.ERP5Type.patches import Publish
 from Products.ERP5Type.patches import WSGITask
 from Products.ERP5Type.patches import urllib_opener
+from Products.ERP5Type.patches import SharedDCScriptsBindings
 
 # These symbols are required for backward compatibility
 from Products.ERP5Type.patches.PropertyManager import ERP5PropertyManager

product/ERP5Type/patches/SharedDCScriptsBindings.py

+import Shared.DC.Scripts.Bindings
+
+# Make Shared.DC.Scripts.Bindings a new style classes already on Zope2, so that
+# we can install business templates exported on Zope4 in Zope2 instances.
+_NameAssignments = Shared.DC.Scripts.Bindings.NameAssignments
+if not isinstance(_NameAssignments, type):
+  class NameAssignments(_NameAssignments, object):
+    def __init__(self, mapping=None):
+      if mapping is None:
+        mapping = {}
+      _NameAssignments.__init__(self, mapping)
+  NameAssignments.__module__ = _NameAssignments.__module__
+
+  Shared.DC.Scripts.Bindings.NameAssignments = NameAssignments

[Jérome Perrin]

https://github.com/zopefoundation/Zope/commit/bb7837c66#diff-592b7c9750c782fa801ae030d96cb241486e4cb75f33595837f5be81fd1f661aL37

https://github.com/zopefoundation/Zope/commit/173658008

[Jérome Perrin]

I have to double check this commit. I don't see when it is a problem

[Jérome Perrin]

I don't see when it is a problem

https://lab.nexedi.com/nexedi/erp5/snippets/1170 describe the need