[hooks/security] provide attribute "add" permission As of today, the update permission on attributes is checked at entity *creation* time. This forbids using update permissions the proper way. We set it to be checked at entity update time only. We introduce a specific 'add' permission rule for attributes. For backward compatibility, its default value will be the same as the current 'update' permission. Notes: * needs a new yams version (ticket #149216) * introduces two new 'add_permissions' rdefs (attribute - group|rqlexpr) * if the update permission was () and the bw compat kicks in, the rule is not enforced, to avoid un-creatable entity types -- this restriction will be lifted when the bw compat is gone * small internal refactoring on check_entity_attributes * one small pre 3.6.1 bw compat snippet must be removed from schemaserial Closes #2965518.

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from cubicweb.schemas.base import in_group, CWSourceSchemaConfig

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# copy __permissions__ to avoid modifying a shared dictionary

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in_group.__permissions__ = in_group.__permissions__.copy()

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in_group.__permissions__['read'] = ('managers',)

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cw_for_source = CWSourceSchemaConfig.get_relation('cw_for_source')

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cw_for_source.__permissions__ = {'read': ('managers', 'users'),

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                                 'add': ('managers',),

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                                 'delete': ('managers',)}

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