python-pip fails to build with Python 3.15.0a8.

________ test_trailing_slash_directory_metadata[/path/to/foo.egg-info/] ________
[gw0] linux -- Python 3.15.0 /usr/bin/python3

path = '/path/to/foo.egg-info/'

    @pytest.mark.parametrize(
        "path",
        [
            "/path/to/foo.egg-info".replace("/", os.path.sep),
            # Tests issue fixed by https://github.com/pypa/pip/pull/2530
            "/path/to/foo.egg-info/".replace("/", os.path.sep),
        ],
    )
    def test_trailing_slash_directory_metadata(path: str) -> None:
        dist = get_directory_distribution(path)
>       assert dist.raw_name == dist.canonical_name == "foo"
               ^^^^^^^^^^^^^

tests/unit/metadata/test_metadata.py:148: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
../BUILDROOT/usr/lib/python3.15/site-packages/pip/_internal/metadata/base.py:416: in raw_name
    return self.metadata.get("Name", self.canonical_name)
           ^^^^^^^^^^^^^
/usr/lib64/python3.15/functools.py:1169: in __get__
    val = self.func(instance)
          ^^^^^^^^^^^^^^^^^^^
../BUILDROOT/usr/lib/python3.15/site-packages/pip/_internal/metadata/base.py:391: in metadata
    metadata = self._metadata_impl()
               ^^^^^^^^^^^^^^^^^^^^^
../BUILDROOT/usr/lib/python3.15/site-packages/pip/_internal/metadata/importlib/_dists.py:210: in _metadata_impl
    return cast(email.message.Message, self._dist.metadata)
                                       ^^^^^^^^^^^^^^^^^^^
/usr/lib64/python3.15/importlib/metadata/__init__.py:543: in metadata
    return self._assemble_message(self._ensure_metadata_present(text))
                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

self = <importlib.metadata.PathDistribution object at 0x7f7c90b2f480>
text = None

    def _ensure_metadata_present(self, text: str | None) -> str:
        if text is not None:
            return text
    
>       raise MetadataNotFound('No package metadata was found.')
E       importlib.metadata.MetadataNotFound: No package metadata was found.

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_64/10318777-python-pip/

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

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.