awscli2 fails to build with Python 3.15.0a8.

There's 15 test failures with different tracebacks, ultimately leading to the AssertionError displayed here:

___________________________ test_only_compress_once ____________________________
[gw0] linux -- Python 3.15.0 /usr/bin/python3

    @mock.patch.object(botocore.compress, 'gzip_compress', static_compress)
    @mock.patch.object(botocore.compress, 'COMPRESSION_MAPPING', MOCK_COMPRESSION)
    @pytest.mark.skipif(
        sys.version_info < (3, 8), reason='requires python3.8 or higher'
    )
    def test_only_compress_once():
        request_dict = _request_dict()
        maybe_compress_request(
            COMPRESSION_CONFIG_128_BYTES,
            request_dict,
            OP_MULTIPLE_COMPRESSIONS,
        )
>       assert_request_compressed(request_dict, REQUEST_BODY_COMPRESSED)

tests/unit/botocore/test_compress.py:322: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
tests/unit/botocore/test_compress.py:139: in assert_request_compressed
    _assert_compression_body(request_dict['body'], expected_body)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

compressed_body = b'\x1f\x8b\x08\x00\x01\x00\x00\x00\x00\xffsL.\xc9\xcc\xcf\xb3\r(-\xf1M-)\xcaLvI,IT\x0bK-*\x06\x89\x1a\x19\x18\x1a\xe8\...\\0\x13\xab\xaa\xd0\xbc\xcc\x12[\xa7\xca\x92\xd4b\xac\xd2a\x899\xa5\xa9\xb6\x86F\x16\x00\x1e\xdd\t\xfd\x9e\x00\x00\x00'
expected_body = b'\x1f\x8b\x08\x00\x01\x00\x00\x00\x02\xffsL.\xc9\xcc\xcf\xb3\r(-\xf1M-)\xcaLvI,IT\x0bK-*\x06\x89\x1a\x19\x18\x1a\xe8\...\\0\x13\xab\xaa\xd0\xbc\xcc\x12[\xa7\xca\x92\xd4b\xac\xd2a\x899\xa5\xa9\xb6\x86F\x16\x00\x1e\xdd\t\xfd\x9e\x00\x00\x00'

    def _assert_compression_body(compressed_body, expected_body):
        data = compressed_body
        if hasattr(compressed_body, 'read'):
            data = compressed_body.read()
>       assert data == expected_body
E       AssertionError: assert b'\x1f\x8b\x0...e\x00\x00\x00' == b'\x1f\x8b\x0...e\x00\x00\x00'
E         
E         At index 8 diff: b'\x00' != b'\x02'
E         
E         Full diff:
E         - (b'\x1f\x8b\x08\x00\x01\x00\x00\x00\x02\xffsL.\xc9\xcc\xcf\xb3\r(-\xf1M-)'
E         ?                                       ^
E         + (b'\x1f\x8b\x08\x00\x01\x00\x00\x00\x00\xffsL.\xc9\xcc\xcf\xb3\r(-\xf1M-)'...
E         
E         ...Full output truncated (5 lines hidden), use '-vv' to show

tests/unit/botocore/test_compress.py:130: AssertionError

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_64/10319072-awscli2/

For all our attempts to build awscli2 with Python 3.15, see:
https://copr.fedorainfracloud.org/coprs/g/python/python3.15/package/awscli2/

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.