KeyError: 'metadata'

[MarcoGorelli]

Here is my setup.cfg file:

[bumpversion]
current_version = 0.2.1

[flake8]
ignore = E203,E503,W504
max-line-length = 120
exclude = venv,.*

[pydocstyle]
add-ignore = D104

[mypy]
disallow_untyped_defs = True

[mypy-pytest]
ignore_missing_imports = True

[mypy-_pytest.capture]
ignore_missing_imports = True

[mypy-setuptools]
ignore_missing_imports = True

[mypy-setup]
ignore_errors = True

[mypy-conf]
ignore_errors = True

Here's the error from pre-commit run --all:

setup-cfg-fmt............................................................Failed
- hook id: setup-cfg-fmt
- exit code: 1

Traceback (most recent call last):
  File "/home/marco/.cache/pre-commit/repoowkkinfn/py_env-python3/bin/setup-cfg-fmt", line 8, in <module>
    sys.exit(main())
  File "/home/marco/.cache/pre-commit/repoowkkinfn/py_env-python3/lib/python3.8/site-packages/setup_cfg_fmt.py", line 456, in main
    if format_file(
  File "/home/marco/.cache/pre-commit/repoowkkinfn/py_env-python3/lib/python3.8/site-packages/setup_cfg_fmt.py", line 331, in format_file
    cfg['metadata']['name'] = cfg['metadata']['name'].replace('-', '_')
  File "/usr/lib/python3.8/configparser.py", line 960, in __getitem__
    raise KeyError(key)
KeyError: 'metadata'

[asottile]

yeah setup-cfg-fmt assumes you're using some amount of declarative metadata already -- you probably want to run setup-py-upgrade first