This should elminate flaky CI due to ephemeral dirs in the source root
created by the setuptools build backend which were not multi-process
safe.
The hatchling build backend supports metadata plugins and it performs
isolated builds making it a good replacement for the prior setuptools
hack for effecting dynamic Requires-Python to enable Python 3.13
shadow-support. Unfortunately, there is no nice way to specify an
in-tree plugin; so we actually use a very thin in-tree build backend
that wraps hatchling.build, to allow discovery of our in-tree plugin.
This should elminate flaky CI due to ephemeral dirs in the source root created by the setuptools build backend which were not multi-process safe.
The
hatchlingbuild backend supports metadata plugins and it performs isolated builds making it a good replacement for the prior setuptools hack for effecting dynamicRequires-Pythonto enable Python 3.13 shadow-support. Unfortunately, there is no nice way to specify an in-tree plugin; so we actually use a very thin in-tree build backend that wrapshatchling.build, to allow discovery of our in-tree plugin.