rebase-helper fails to build in Fedora 33:

E               RuntimeError: Git rebase failed with unknown reason. Please check log file
/builddir/build/BUILD/rebase-helper-0.21.0/rebasehelper/patcher.py:187: RuntimeError
------------------------------ Captured log call -------------------------------
INFO     rebasehelper.patcher:patcher.py:136 git-rebase operation to new_sources is ongoing...
VERBOSE  rebasehelper.patcher:patcher.py:166 
  stdout: 'Auto-merging lipsum.txt
CONFLICT (content): Merge conflict in lipsum.txt'


See https://koschei.fedoraproject.org/package/rebase-helper

git was updated from 2.25.1-3.fc33 to 2.26.0-0.3.rc2.fc33, but that might not necessarily bee the casue.

This blocks the Python 3.9 rebuild.

For the build logs with Python 3.9, see:
https://copr-be.cloud.fedoraproject.org/results/@python/python3.9/fedora-rawhide-x86_64/01322483-rebase-helper/

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

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.