b4 prep --edit-cover throws ValueError

[fschrempf]

I'm getting the following error when setting up a new branch and editing the cover letter through b4 prep --edit-cover with Python 3.14.3:

Invoking git-filter-repo to update the cover letter.
Traceback (most recent call last):
  File "/home/frieder/.local/bin/b4", line 6, in <module>
    sys.exit(cmd())
             ~~~^^
  File "/home/frieder/.local/pipx/venvs/b4/lib/python3.14/site-packages/b4/command.py", line 489, in cmd
    cmdargs.func(cmdargs)
    ~~~~~~~~~~~~^^^^^^^^^
  File "/home/frieder/.local/pipx/venvs/b4/lib/python3.14/site-packages/b4/command.py", line 85, in cmd_prep
    b4.ez.cmd_prep(cmdargs)
    ~~~~~~~~~~~~~~^^^^^^^^^
  File "/home/frieder/.local/pipx/venvs/b4/lib/python3.14/site-packages/b4/ez.py", line 3115, in cmd_prep
    return edit_cover()
  File "/home/frieder/.local/pipx/venvs/b4/lib/python3.14/site-packages/b4/ez.py", line 855, in edit_cover
    store_cover(new_cover, tracking)
    ~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^
  File "/home/frieder/.local/pipx/venvs/b4/lib/python3.14/site-packages/b4/ez.py", line 719, in store_cover
    run_frf(frf)
    ~~~~~~~^^^^^
  File "/home/frieder/.local/pipx/venvs/b4/lib/python3.14/site-packages/b4/ez.py", line 128, in run_frf
    frf.run()
    ~~~~~~~^^
  File "/home/frieder/.local/pipx/venvs/b4/lib/python3.14/site-packages/git_filter_repo.py", line 4875, in run
    self._run_sanity_checks()
    ~~~~~~~~~~~~~~~~~~~~~~~^^
  File "/home/frieder/.local/pipx/venvs/b4/lib/python3.14/site-packages/git_filter_repo.py", line 3276, in _run_sanity_checks
    self._config_settings = GitUtils.get_config_settings(target_working_dir)
                            ~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^
  File "/home/frieder/.local/pipx/venvs/b4/lib/python3.14/site-packages/git_filter_repo.py", line 1692, in get_config_settings
    return dict(line.split(b'=', maxsplit=1)
                for line in output.strip().split(b"\n"))
ValueError: dictionary update sequence element #141 has length 1; 2 is required

[fschrempf]

Ok, the issue here was that I had a cover-letter for some old branch manually set up as branch description in my .git/config. It seems like this was conflicting with b4. After removing it, everything works as expected.

Not sure if this should be handled more gracefully.