Feature request: hatchling should implement the prepare_metadata_for_build_wheel hook

In Fedora Linux, the prepare_metadata_for_build_wheel hook is used to generate a package’s runtime requirements to use as build-time RPM dependencies, which is helpful for ensuring everything is in place to run the tests. Since hatchling does not implement this hook, it’s not possible to do this for hatchling or for projects that use it as a build backend. The most popular Python build systems (setuptools, poetry, flit, build, etc.) do support this hook.

This is just an inconvenience, and can be worked around by some manual effort or project-specific scripting hacks, but it would be a helpful feature if it’s practical to implement.

[musicinmybrain]

@musicinmybrain If you wish to experiment with building the wheel in =generate_buildrequires, open an RFE for pyproject-rpm-macros. I bet it’s actually doable somehow.

Thanks. Currently, there are three packages in Fedora that would benefit: python-hatchling, python-userpath, and hatch (once 1.0 is released). For now, I think that I’m personally happier maintaining the scripted workarounds in these packages than figuring out the implications and caveats of building the wheel in %generate_buildrequires in the general case.

If hatch/hatchling becomes quite popular, or if other build systems make the same choice not to offer this hook, then it might become much more beneficial to figure out how to deal with this in %pyproject_buildrequires.

I’ll go ahead and close this issue. Thanks for considering and investigating it.

[ofek]

• https://github.com/dependabot/dependabot-core/issues/3290#issuecomment-1238417795
• https://github.com/pypa/hatch/pull/466