python-capturer fails to build with Python 3.14.0a2.

==================== 1 failed, 1 passed, 25 errors in 0.31s ====================
Traceback (most recent call last):
  File "/usr/bin/py.test-3.14", line 8, in <module>
    sys.exit(console_main())
             ~~~~~~~~~~~~^^
  File "/usr/lib/python3.14/site-packages/_pytest/config/__init__.py", line 201, in console_main
    code = main()
  File "/usr/lib/python3.14/site-packages/_pytest/config/__init__.py", line 175, in main
    ret: ExitCode | int = config.hook.pytest_cmdline_main(config=config)
                          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^
  File "/usr/lib/python3.14/site-packages/pluggy/_hooks.py", line 513, in __call__
    return self._hookexec(self.name, self._hookimpls.copy(), kwargs, firstresult)
           ~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.14/site-packages/pluggy/_manager.py", line 120, in _hookexec
    return self._inner_hookexec(hook_name, methods, kwargs, firstresult)
           ~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.14/site-packages/pluggy/_callers.py", line 139, in _multicall
    raise exception.with_traceback(exception.__traceback__)
  File "/usr/lib/python3.14/site-packages/pluggy/_callers.py", line 103, in _multicall
    res = hook_impl.function(*args)
  File "/usr/lib/python3.14/site-packages/_pytest/main.py", line 330, in pytest_cmdline_main
    return wrap_session(config, _main)
  File "/usr/lib/python3.14/site-packages/_pytest/main.py", line 325, in wrap_session
    config._ensure_unconfigure()
    ~~~~~~~~~~~~~~~~~~~~~~~~~~^^
  File "/usr/lib/python3.14/site-packages/_pytest/config/__init__.py", line 1127, in _ensure_unconfigure
    fin()
    ~~~^^
  File "/usr/lib/python3.14/site-packages/_pytest/capture.py", line 758, in stop_global_capturing
    self._global_capturing.pop_outerr_to_orig()
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^
  File "/usr/lib/python3.14/site-packages/_pytest/capture.py", line 639, in pop_outerr_to_orig
    out, err = self.readouterr()
               ~~~~~~~~~~~~~~~^^
  File "/usr/lib/python3.14/site-packages/_pytest/capture.py", line 686, in readouterr
    out = self.out.snap() if self.out else ""
          ~~~~~~~~~~~~~^^
  File "/usr/lib/python3.14/site-packages/_pytest/capture.py", line 571, in snap
    self.tmpfile.seek(0)
    ~~~~~~~~~~~~~~~~~^^^
OSError: [Errno 29] Illegal seek

https://docs.python.org/3.14/whatsnew/3.14.html

For the build logs, see:
https://copr-be.cloud.fedoraproject.org/results/@python/python3.14/fedora-rawhide-x86_64/08300807-python-capturer/

For all our attempts to build python-capturer with Python 3.14, see:
https://copr.fedorainfracloud.org/coprs/g/python/python3.14/package/python-capturer/

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 3.14:
https://copr.fedorainfracloud.org/coprs/g/python/python3.14/

Let us know here if you have any questions.

Python 3.14 is planned to be included in Fedora 43.
To make that update smoother, we're building Fedora packages with all pre-releases of Python 3.14.
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.