pcs fails to build with Python 3.15.0a6.

======================================================================
ERROR: test_has_all_subclasses_are_dataclasses (pcs_test.tier0.common.interface.test_dto.DatatransferObjectTest.test_has_all_subclasses_are_dataclasses)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/builddir/build/BUILD/pcs-0.12.1-build/pcs-0.12.1/pcs_test/tier0/common/interface/test_dto.py", line 43, in test_has_all_subclasses_are_dataclasses
    _import_all(pcs.__path__)
    ~~~~~~~~~~~^^^^^^^^^^^^^^
  File "/builddir/build/BUILD/pcs-0.12.1-build/pcs-0.12.1/pcs_test/tier0/common/interface/test_dto.py", line 33, in _import_all
    module_finder.find_spec(module_name).loader.load_module(module_name)
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'SourceFileLoader' object has no attribute 'load_module'. Did you mean: 'exec_module'?

======================================================================
ERROR: test_valid_data (pcs_test.tier0.lib.permissions.config.test_parser.ParserV2Test.test_valid_data)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/builddir/build/BUILD/pcs-0.12.1-build/pcs-0.12.1/pcs/lib/permissions/config/parser.py", line 39, in parse
    return dacite.from_dict(
           ~~~~~~~~~~~~~~~~^
        ConfigV2, data, config=dacite.Config(cast=[Enum, FrozenSet])
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    )
    ^
  File "/builddir/build/BUILD/pcs-0.12.1-build/pcs-0.12.1/pcs_bundled/packages/dacite/core.py", line 69, in from_dict
    value = _build_value(type_=field_type, data=data[key], config=config)
  File "/builddir/build/BUILD/pcs-0.12.1-build/pcs-0.12.1/pcs_bundled/packages/dacite/core.py", line 107, in _build_value
    data = from_dict(data_class=type_, data=data, config=config)
  File "/builddir/build/BUILD/pcs-0.12.1-build/pcs-0.12.1/pcs_bundled/packages/dacite/core.py", line 69, in from_dict
    value = _build_value(type_=field_type, data=data[key], config=config)
  File "/builddir/build/BUILD/pcs-0.12.1-build/pcs-0.12.1/pcs_bundled/packages/dacite/core.py", line 105, in _build_value
    data = _build_value_for_collection(collection=type_, data=data, config=config)
  File "/builddir/build/BUILD/pcs-0.12.1-build/pcs-0.12.1/pcs_bundled/packages/dacite/core.py", line 162, in _build_value_for_collection
    return data_type(_build_value(type_=item_type, data=item, config=config) for item in data)
  File "/builddir/build/BUILD/pcs-0.12.1-build/pcs-0.12.1/pcs_bundled/packages/dacite/core.py", line 162, in <genexpr>
    return data_type(_build_value(type_=item_type, data=item, config=config) for item in data)
                     ~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/builddir/build/BUILD/pcs-0.12.1-build/pcs-0.12.1/pcs_bundled/packages/dacite/core.py", line 107, in _build_value
    data = from_dict(data_class=type_, data=data, config=config)
  File "/builddir/build/BUILD/pcs-0.12.1-build/pcs-0.12.1/pcs_bundled/packages/dacite/core.py", line 69, in from_dict
    value = _build_value(type_=field_type, data=data[key], config=config)
  File "/builddir/build/BUILD/pcs-0.12.1-build/pcs-0.12.1/pcs_bundled/packages/dacite/core.py", line 113, in _build_value
    data = type_(data)
  File "/usr/lib64/python3.15/enum.py", line 732, in __call__
    return cls.__new__(cls, value)
           ~~~~~~~~~~~^^^^^^^^^^^^
  File "/usr/lib64/python3.15/enum.py", line 1221, in __new__
    raise ve_exc
ValueError: 'PermissionTargetType.USER' is not a valid PermissionTargetType

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/builddir/build/BUILD/pcs-0.12.1-build/pcs-0.12.1/pcs_test/tier0/lib/permissions/config/test_parser.py", line 115, in test_valid_data
    self._run_parse(dict(**asdict(config), format_version=2)), config
    ~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/builddir/build/BUILD/pcs-0.12.1-build/pcs-0.12.1/pcs_test/tier0/lib/permissions/config/test_parser.py", line 25, in _run_parse
    return ParserV2.parse(json.dumps(data).encode())
           ~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/builddir/build/BUILD/pcs-0.12.1-build/pcs-0.12.1/pcs/lib/permissions/config/parser.py", line 45, in parse
    raise ParserError(str(e)) from e
pcs.lib.permissions.config.parser.ParserError

----------------------------------------------------------------------
Ran 7493 tests in 6.429s


https://docs.python.org/3.15/whatsnew/3.15.html

For the build logs, see:
https://copr-be.cloud.fedoraproject.org/results/@python/python3.15/fedora-rawhide-x86_64/10147873-pcs/

For all our attempts to build pcs with Python 3.15, see:
https://copr.fedorainfracloud.org/coprs/g/python/python3.15/package/pcs/

Testing and mass rebuild of packages is happening in copr.
You can follow these instructions to test locally in mock if your package builds with Python 3.15:
https://copr.fedorainfracloud.org/coprs/g/python/python3.15/

Let us know here if you have any questions.

Python 3.15 is planned to be included in Fedora 45.
To make that update smoother, we're building Fedora packages with all pre-releases of Python 3.15.
A build failure prevents us from testing all dependent packages (transitive [Build]Requires),
so if this package is required a lot, it's important for us to get it fixed soon.

We'd appreciate help from the people who know this package best,
but if you don't want to work on this now, let us know so we can try to work around it on our side.