[Python-modules-team] Bug#950069: python-cerberus FTBFS with Python 3.8 as supported version

[Adrian Bunk]

Source: python-cerberus
Version: 1.2-2
Severity: serious
Tags: ftbfs bullseye sid

https://tests.reproducible-builds.org/debian/rb-pkg/unstable/amd64/python-cerberus.html

...
============================= test session starts ==============================
platform linux -- Python 3.8.1, pytest-4.6.9, py-1.8.0, pluggy-0.13.0
rootdir: /build/1st/python-cerberus-1.2, inifile: pytest.ini
collected 210 items

cerberus/tests/test_assorted.py ........                                 [  3%]
cerberus/tests/test_customization.py ....                                [  5%]
cerberus/tests/test_errors.py .........                                  [ 10%]
cerberus/tests/test_normalization.py ................................... [ 26%]
..........                                                               [ 31%]
cerberus/tests/test_registries.py ..........                             [ 36%]
cerberus/tests/test_schema.py .............                              [ 42%]
cerberus/tests/test_validation.py ...................................... [ 60%]
....................................................s........F.......... [ 94%]
...........                                                              [100%]

=================================== FAILURES ===================================
______________________________ test_nested_oneofs ______________________________

validator = <cerberus.validator.Validator object at 0x7f17c3c581f0>

    def test_nested_oneofs(validator):
>       validator.schema = {'abc': {
            'type': 'dict',
            'oneof_schema': [
                {'foo': {
                    'type': 'dict',
                    'schema': {'bar': {'oneof_type': ['integer', 'float']}}
                }},
                {'baz': {'type': 'string'}}
            ]}}

cerberus/tests/test_validation.py:1312: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
cerberus/validator.py:509: in schema
    self._schema = DefinitionSchema(self, schema)
cerberus/schema.py:69: in __init__
    self.validate(schema)
cerberus/schema.py:197: in validate
    self._validate(schema)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

self = <[AttributeError("'DefinitionSchema' object has no attribute 'schema'") raised in repr()] DefinitionSchema object at 0x7f17c3f91ac0>
schema = {'abc': {'oneof': [{'schema': {'foo': {'schema': {...}, 'type': 'dict'}}}, {'schema': {'baz': {'type': 'string'}}}], 'type': 'dict'}}

    def _validate(self, schema):
        """ Validates a schema that defines rules against supported rules.
    
        :param schema: The schema to be validated as a legal cerberus schema
                       according to the rules of this Validator object.
        """
        if isinstance(schema, _str_type):
            schema = self.validator.schema_registry.get(schema, schema)
    
        if schema is None:
            raise SchemaError(errors.SCHEMA_ERROR_MISSING)
    
        schema = copy(schema)
        for field in schema:
            if isinstance(schema[field], _str_type):
                schema[field] = rules_set_registry.get(schema[field],
                                                       schema[field])
    
        if not self.schema_validator(schema, normalize=False):
>           raise SchemaError(self.schema_validator.errors)
E           cerberus.schema.SchemaError: {'abc': [{'oneof': [{'schema': ['no definitions validate', {'anyof definition 0': [{'foo': [{'schema': ['no definitions validate', {'anyof definition 0': [{'bar': [{'oneof_type': ['unknown rule']}]}], 'anyof definition 1': [{'bar': ['unknown rule']}]}]}]}], 'anyof definition 1': [{'foo': ['unknown rule']}]}]}]}]}

cerberus/schema.py:219: SchemaError
...