Reported the bug upstream: https://github.com/xonsh/xonsh/issues/3101

Short summary of the problem: The `ast` library of Python is not stable. `ast.Module` now needs to be called with two arguments except one. See https://bugs.python.org/issue35894 and https://github.com/ipython/ipython/issues/11590

I included a fix in the bug report, but it breaks some tests. It also breaks compatibility with Python 3.7, but that is easily fixed with a simple version check.

Upstream released 0.9.0 with basic Python 3.8 support. I have packaged it for Rawhide and it passes all the tests.

Created attachment 1566706 [details]
Full log from Copr (xonsh 0.9.0-2.fc31, Python 3.8.0a4)

Still failing:

E   TypeError: required field "posonlyargs" missing from arguments

Latest upstream release: 0.9.4 Current version/release in rawhide: 0.9.3-1.fc31 URL: http://xon.sh Please consult the package updates policy before you issue an update to a stable branch: https://fedoraproject.org/wiki/Updates_Policy More information about the service that created this bug can be found at: https://fedoraproject.org/wiki/Upstream_release_monitoringPlease keep in mind that with any upstream change, there may also be packaging changes that need to be made. Specifically, please remember that it is your responsibility to review the new version to ensure that the licensing is still correct and that no non-free or legally problematic items have been added upstream.Based on the information from anitya: https://release-monitoring.org/project/10820/

Skipping the scratch build because an SRPM could not be built: ['git', 'clone', 'https://src.fedoraproject.org/cgit/rpms/xonsh.git', '/var/tmp/thn-xxqk7gt3'] returned 128: b"Cloning into '/var/tmp/thn-xxqk7gt3'...\nfatal: repository 'https://src.fedoraproject.org/cgit/rpms/xonsh.git/' not found\n"

This bug appears to have been reported against 'rawhide' during the Fedora 31 development cycle.
Changing version to '31'.

This bug appears to have been reported against 'rawhide' during the Fedora 31 development cycle.
Changing version to 31.

0.9.10 built for Rawhide

Thanks, but it still doesn't build with Python 3.8.0b3:

Executing(%check): /bin/sh -e /var/tmp/rpm-tmp.m1AKgv
+ umask 022
+ cd /builddir/build/BUILD
+ cd xonsh-0.9.10
+ sed --in-place s:pytest:py.test-3: run-tests.xsh
+ PYTHONDONTWRITEBYTECODE=1
+ PYTHONPATH=/builddir/build/BUILDROOT/xonsh-0.9.10-1.fc31.x86_64/usr/lib/python3.8/site-packages
+ PATH=/builddir/build/BUILDROOT/xonsh-0.9.10-1.fc31.x86_64/usr/bin:/builddir/.local/bin:/builddir/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/sbin
+ /builddir/build/BUILDROOT/xonsh-0.9.10-1.fc31.x86_64/usr/bin/xonsh run-tests.xsh
BUILDSTDERR: Traceback (most recent call last):
BUILDSTDERR:   File "/builddir/build/BUILDROOT/xonsh-0.9.10-1.fc31.x86_64/usr/bin/xonsh", line 4, in <module>
BUILDSTDERR:     main()
BUILDSTDERR:   File "/builddir/build/BUILDROOT/xonsh-0.9.10-1.fc31.x86_64/usr/lib/python3.8/site-packages/xonsh/__amalgam__.py", line 24011, in main
BUILDSTDERR:     _failback_to_other_shells(args, err)
BUILDSTDERR:   File "/builddir/build/BUILDROOT/xonsh-0.9.10-1.fc31.x86_64/usr/lib/python3.8/site-packages/xonsh/__amalgam__.py", line 23975, in _failback_to_other_shells
BUILDSTDERR:     raise err
BUILDSTDERR:   File "/builddir/build/BUILDROOT/xonsh-0.9.10-1.fc31.x86_64/usr/lib/python3.8/site-packages/xonsh/__amalgam__.py", line 24009, in main
BUILDSTDERR:     return main_xonsh(args)
BUILDSTDERR:   File "/builddir/build/BUILDROOT/xonsh-0.9.10-1.fc31.x86_64/usr/lib/python3.8/site-packages/xonsh/__amalgam__.py", line 24052, in main_xonsh
BUILDSTDERR:     run_script_with_cache(
BUILDSTDERR:   File "/builddir/build/BUILDROOT/xonsh-0.9.10-1.fc31.x86_64/usr/lib/python3.8/site-packages/xonsh/__amalgam__.py", line 3036, in run_script_with_cache
BUILDSTDERR:     ccode = compile_code(filename, code, execer, glb, loc, mode)
BUILDSTDERR:   File "/builddir/build/BUILDROOT/xonsh-0.9.10-1.fc31.x86_64/usr/lib/python3.8/site-packages/xonsh/__amalgam__.py", line 2995, in compile_code
BUILDSTDERR:     ccode = execer.compile(code, glbs=glb, locs=loc, mode=mode, filename=filename)
BUILDSTDERR:   File "/builddir/build/BUILDROOT/xonsh-0.9.10-1.fc31.x86_64/usr/lib/python3.8/site-packages/xonsh/__amalgam__.py", line 23095, in compile
BUILDSTDERR:     code = compile(tree, filename, mode)
BUILDSTDERR: TypeError: required field "posonlyargs" missing from arguments
BUILDSTDERR: error: Bad exit status from /var/tmp/rpm-tmp.m1AKgv (%check)
RPM build errors:
BUILDSTDERR:     Bad exit status from /var/tmp/rpm-tmp.m1AKgv (%check)
Child return code was: 1

For the build logs, see:
https://copr-be.cloud.fedoraproject.org/results/@python/python3.8/fedora-rawhide-x86_64/00999700-xonsh/

For all our attempts to build xonsh with Python 3.8, see:
https://copr.fedorainfracloud.org/coprs/g/python/python3.8/package/xonsh/

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 3.8:
https://copr.fedorainfracloud.org/coprs/g/python/python3.8/

Let us know here if you have any questions.

Oh, woops, it built for Rawhide, my bad.

No problem, it might be confusing that we open bug report before 3.8 hits rawhide. We plan to start building in a side tag right after F31 branching finishes (I expect less than 24 hours).

The coordinated rebuild of Python 3.8 has started in the `f32-python` side tag.

If you figure out how to rebuild this package, please don't rebuild it in regular rawhide, but use the side tag instead:

    on branch master:
    $ fedpkg build --target=f32-python

To wait for a build to show up in the side tag, do:

    $ koji wait-repo f32-python --build=<nvr>

Where <nvr> is name-version-release of the source package, e.g. python-foo-1.1-2.fc32.

An updated mock config is posted at:
http://copr.fedorainfracloud.org/coprs/g/python/python3.8/

Note that it will take a while before the essential packages are rebuilt, so don't expect all your dependencies to be available right away.

Thanks. Let us know if you need up to date info, or if you have any questions.



PS this message is mass posted to all the bugs that block the PYTHON38 bug. If this is also a Fedora 31 FTBFS bug and you manage to fix it, you can do a f31 build as usual:

    on branch f31:
    $ fedpkg build

Ahh, so it seems that upstream is not quite done doing the port.

The f32-python side tag has been merged. In order to rebuild the package, do it in regular rawhide, but please wait until python3-3.8 is tagged:

  $ koji wait-repo f32-build --build python3-3.8.0~b3-3.fc32


If your built already started in f32-python, after it is finished, please tag it to rawhide with:

  $ koji tag-build f32-pending <nvr>

For example:

  $ koji tag-build f32-pending libreoffice-6.3.0.4-3.fc32

Thanks!

(This comment is mass posted to all bugzillas blocking the PYTHON38 tracking bug.)

(Python 3.8 has landed in the rawhide buildroot.)

xonsh-0.9.11-2 is available in rawhide. I made that package build by temporarily disabling the packages. It is kind of broken, however.

Upstream bug report:

https://github.com/xonsh/xonsh/issues/3271

Seem this was fixed upstream.

xonsh 0.9.13-1 in rawhide should be working with an identical feature set to the Python 3.7 version. Some specific Python 3.8 features aren't supported yet, but that should be fine.

Thank You, Carmen!