[Rpm-maint] [rpm-software-management/rpm] pythondistdeps: add support for "environment markers" (PEP-508) (#382)

[Nick Coghlan]

Hmm, that's actually a good question - I'm not entirely sure what pip/setuptools do with the "Requires-Dist" in METADATA where environment markers are concerned.

However, my expectation would be that they just copy them through verbatim, environment markers and all, rather than only copying through the ones that definitely apply.

The motivation for that behaviour would be wheel files that are compatible with multiple versions: since the wheel file may be cross-version and/or cross-platform, it needs to express environment dependent dependencies. That METADATA file would then be copied verbatim into the installation directory.

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