Option to skip diff-cover when not in a git repository

[warsaw]

I have the following commands in my tox.ini [testenv] section:

commands =
    pdm config --local use_venv True
    pdm install -G testing
    pytest {posargs}
    # The following is only useful in a git repository.
    diff-cover coverage.xml

I'd like for tox to be runnable from an unpacked sdist, but that won't be in a git repository, so it fails like so:

py310 run-test: commands[3] | -diff-cover coverage.xml
Traceback (most recent call last):
  File "/private/tmp/testing/atpublic-3.0/.tox/py310/bin/diff-cover", line 8, in <module>
    sys.exit(main())
  File "/private/tmp/testing/atpublic-3.0/.tox/py310/lib/python3.10/site-packages/diff_cover/diff_cover_tool.py", line 258, in main
    GitPathTool.set_cwd(directory)
  File "/private/tmp/testing/atpublic-3.0/.tox/py310/lib/python3.10/site-packages/diff_cover/git_path.py", line 33, in set_cwd
    cls._root = cls._git_root()
  File "/private/tmp/testing/atpublic-3.0/.tox/py310/lib/python3.10/site-packages/diff_cover/git_path.py", line 65, in _git_root
    git_root = execute(command)[0]
  File "/private/tmp/testing/atpublic-3.0/.tox/py310/lib/python3.10/site-packages/diff_cover/command_runner.py", line 45, in execute
    raise CommandError(stderr)
diff_cover.command_runner.CommandError: fatal: not a git repository (or any of the parent directories): .git

I can prefix the diff-cover command with - in my tox.ini so the error won't fail the test, but I'd rather provide an option to diff-cover that essentially says "skip me without an error if I'm not in a git repository".

[ArleneCheung]

Hello,I want to ask you some questions.Do you now have some progress about this problem? I also want to use diff cover without git.I want to use diff cover in SVN!!!