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Bug 1817711 - python-genshi fails to build with Python 3.9: module '_ast' has no attribute 'Index'
Summary: python-genshi fails to build with Python 3.9: module '_ast' has no attribute ...
Keywords:
Status: CLOSED RAWHIDE
Alias: None
Product: Fedora
Classification: Fedora
Component: python-genshi
Version: rawhide
Hardware: Unspecified
OS: Unspecified
unspecified
unspecified
Target Milestone: ---
Assignee: Felix Schwarz
QA Contact: Fedora Extras Quality Assurance
URL:
Whiteboard:
: 1842125 (view as bug list)
Depends On:
Blocks: F33FTBFS F33FailsToInstall PYTHON39 1817673 1841776 1841793 1841816 1842090 1842125
TreeView+ depends on / blocked
 
Reported: 2020-03-26 19:21 UTC by Miro Hrončok
Modified: 2020-06-16 07:53 UTC (History)
5 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Last Closed: 2020-06-16 07:53:12 UTC
Type: Bug
Embargoed:

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System ID Private Priority Status Summary Last Updated
Github edgewall genshi issues 23 0 None closed Python 3.9: module '_ast' has no attribute 'Index' 2020-11-04 09:03:26 UTC

Description Miro Hrončok 2020-03-26 19:21:50 UTC 
python-genshi fails to build with Python 3.9.0a5:

Exception raised:
    Traceback (most recent call last):
      File "/usr/lib64/python3.9/doctest.py", line 1329, in __run
        exec(compile(example.source, filename, "single",
      File "<doctest genshi.template.eval.Expression[3]>", line 1, in <module>
        Expression('items[-1]').evaluate(data)
      File "/builddir/build/BUILD/python3-python-genshi-0.7.3-5.fc33/build/lib/genshi/template/eval.py", line 93, in __init__
        self.code = _compile(node, self.source, mode=self.mode,
      File "/builddir/build/BUILD/python3-python-genshi-0.7.3-5.fc33/build/lib/genshi/template/eval.py", line 451, in _compile
        tree = xform().visit(node)
      File "/builddir/build/BUILD/python3-python-genshi-0.7.3-5.fc33/build/lib/genshi/template/astutil.py", line 798, in visit
        return visitor(node)
      File "/builddir/build/BUILD/python3-python-genshi-0.7.3-5.fc33/build/lib/genshi/template/astutil.py", line 820, in _clone
        value = self.visit(value)
      File "/builddir/build/BUILD/python3-python-genshi-0.7.3-5.fc33/build/lib/genshi/template/astutil.py", line 798, in visit
        return visitor(node)
      File "/builddir/build/BUILD/python3-python-genshi-0.7.3-5.fc33/build/lib/genshi/template/eval.py", line 640, in visit_Subscript
        not isinstance(node.slice, _ast.Index):
    AttributeError: module '_ast' has no attribute 'Index'

For the build logs, see:
https://copr-be.cloud.fedoraproject.org/results/@python/python3.9/fedora-rawhide-x86_64/01321086-python-genshi/

For all our attempts to build python-genshi with Python 3.9, see:
https://copr.fedorainfracloud.org/coprs/g/python/python3.9/package/python-genshi/

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 3.9:
https://copr.fedorainfracloud.org/coprs/g/python/python3.9/

Let us know here if you have any questions.

Python 3.9 will be included in Fedora 33. To make that update smoother, we're building Fedora packages with early pre-releases of Python 3.9.
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.
Comment 1 Felix Schwarz 2020-03-26 21:57:58 UTC 
Upstream bug: https://github.com/edgewall/genshi/issues/23
Comment 2 Dominik 'Rathann' Mierzejewski 2020-04-11 22:53:40 UTC 
I came across this bug when running the testsuite of lazygal. 22/74 tests are failing with this error.
Comment 3 Miro Hrončok 2020-05-25 13:02:33 UTC 
This comment is mass posted to all bugs blocking the Python 3.9 tracker, sorry if it is not 100 % relevant. When in doubt, please ask.


The Python 3.9 rebuild is in progress in a Koji side tag.

If you fix this bug, please don't rebuild the package in regular rawhide, but do it in the side tag with:

    $ fedpkg build --target=f33-python

The rebuild is progressing slowly and it is possible this package won't have all the required build dependencies yet. If that's the case, please just leave the fix committed and pushed and we will eventually rebuild it for you.

You are not asked to go and try rebuild all the missing dependencies yourself. If you know there is a bootstrap loop in the dependencies, let me know and we can untangle it together.

If you want to test your fix or reproduce the failure, you can still use the Copr repo mentioned in the initial comment of this bug: https://copr.fedorainfracloud.org/coprs/g/python/python3.9/
Comment 4 Miro Hrončok 2020-05-29 07:12:15 UTC 
Python 3.9 update: The f33-python side tag is currently being merged.

New builds in f33-python are no longer possible, but python3 is not yet updated to Python 3.9 in rawhide. You can check when Python is Python 3.9 with:

    $ koji wait-repo f33-build --build python3.9-3.9.0~b1-3.fc3

And build the packages normally after that.
Comment 5 Felix Schwarz 2020-05-31 07:40:54 UTC 
This is an upstream problem. I digged into the code briefly but it seems this is not trivial to solve. I'll try to come up with a patch but no promises. Also I'm not sure how much time I can spend on Genshi so no promises. If you have some cycles just start looking into genshi, don't wait for me (please share your progress in the linked upstream bug).
Comment 6 Miro Hrončok 2020-06-01 12:26:48 UTC 
*** Bug 1842125 has been marked as a duplicate of this bug. ***
Comment 7 Igor Raits 2020-06-01 14:18:06 UTC 
Hello,

This is the first reminder (step 3 from https://docs.fedoraproject.org/en-US/fesco/Fails_to_build_from_source_Fails_to_install/#_package_removal_for_long_standing_ftbfs_and_fti_bugs).
Comment 8 Felix Schwarz 2020-06-16 07:53:12 UTC 
I built a patched version in rawhide.

Please note that these patches are completely unreviewed and not tested in production. I submitted these as pull request (https://github.com/edgewall/genshi/pull/27) but upstream did not respond yet. However the test suite seems to be solid and I fixed all test failures. Please let me know if you experience problems in your library/application.
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