Add ignore_git_ignore flag to build options

[mbrobbel]

This can be set to include files that are ignored by .gitignore files. This was added in #695.

This may be helpful when Python modules are generated as part of a build. The module should be included in the wheel, but not in the git repo which is why it's in the .gitignore file.

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[messense]

I don't believe this is the way to go. Excluding files via gitignore is a sensible default, simply disable it may cause more issues.

For sdist we already have sdist-include configuration, but there isn't one for wheel yet. Something like the include and exclude configuration of Poetry would be better IMO.

[mbrobbel]

I totally agree with the current default behavior to excludes files listed in ignore files, and the added flag defaults to false which makes this a non-breaking change. Maybe the name is a bit confusing (double negative), but setting ignore_git_ignore to true disables excluding files via gitignore.

For sdist we already have sdist-include configuration, but there isn't one for wheel yet. Something like the include and exclude configuration of Poetry would be better IMO.

Are you suggesting to add that to maturin?

[tool.maturin]
include = []
exclude = []

I could try to implement that. Should we keep the sdist-include or (breaking change) copy the format key behavior from Poetry and deprecate the sdist-include configuration?

[messense]

Are you suggesting to add that to maturin?

Yes

Should we keep the sdist-include or (breaking change) copy the format key behavior from Poetry and deprecate the sdist-include configuration?

We should first deprecate it and print a warning when it appears in configuration, we can then remove sdist-include in the next breaking change release to give users time to migrate to the new format.