Pip dependencies

[henryiii]

Is there a way to set dependencies before the setup function? Since this replaces the normal setup, it means that pip requires scikit-build to already be present on the system. I'm trying to turn the instructions for my package from:

pip install scikit-build cmake
pip install -v my_package

into

pip install -v my_package

I could check for skbuild when I import, then use pip.main from import pip, but that would not respect the standard mechanisms for selecting user vs. system, virtual envs, etc.

PS: I'm working on the GooFit package, preparing it for a Python release in a few weeks.

[jcfr]

Hi @henryiii ,

It is currently not possible.

That said, as soon as pip implements pep-0518, things should be better.

In the mean time, to keep things simple here is what we do:

try:
    from skbuild import setup
except ImportError:
    print('scikit-build is required to build from source.', file=sys.stderr)
    print('Please run:', file=sys.stderr)
    print('', file=sys.stderr)
    print('  python -m pip install scikit-build')
    sys.exit(1)

See https://github.com/InsightSoftwareConsortium/ITKPythonPackage/blob/2025a1c90f3121ea5781e6b2d2b739cce1456410/setup.py#L7-L14

[jcfr]

For reference, see also pypa/pip#3691

[jcfr]

duplicate #124