nixpkgs/pkgs/development/interpreters/python/build-python-package-setuptools.nix
Frederik Rietdijk f665828fa3 Python: improve cross-compilation
This changeset allows for cross-compilation of Python packages. Packages
built with buildPythonPackage are not allowed to refer to the build
machine. Executables that have shebangs will refer to the host.
2019-01-04 10:45:22 +01:00

56 lines
1.7 KiB
Nix

# This function provides specific bits for building a setuptools-based Python package.
{ lib
, python
}:
{
# passed to "python setup.py build_ext"
# https://github.com/pypa/pip/issues/881
setupPyBuildFlags ? []
# Execute before shell hook
, preShellHook ? ""
# Execute after shell hook
, postShellHook ? ""
, ... } @ attrs:
let
# use setuptools shim (so that setuptools is imported before distutils)
# pip does the same thing: https://github.com/pypa/pip/pull/3265
setuppy = ./run_setup.py;
in attrs // {
# we copy nix_run_setup over so it's executed relative to the root of the source
# many project make that assumption
buildPhase = attrs.buildPhase or ''
runHook preBuild
cp ${setuppy} nix_run_setup
${python.pythonForBuild.interpreter} nix_run_setup ${lib.optionalString (setupPyBuildFlags != []) ("build_ext " + (lib.concatStringsSep " " setupPyBuildFlags))} bdist_wheel
runHook postBuild
'';
installCheckPhase = attrs.checkPhase or ''
runHook preCheck
${python.pythonForBuild.interpreter} nix_run_setup test
runHook postCheck
'';
# Python packages that are installed with setuptools
# are typically distributed with tests.
# With Python it's a common idiom to run the tests
# after the software has been installed.
doCheck = attrs.doCheck or true;
shellHook = attrs.shellHook or ''
${preShellHook}
if test -e setup.py; then
tmp_path=$(mktemp -d)
export PATH="$tmp_path/bin:$PATH"
export PYTHONPATH="$tmp_path/${python.pythonForBuild.sitePackages}:$PYTHONPATH"
mkdir -p $tmp_path/${python.pythonForBuild.sitePackages}
${python.pythonForBuild.pkgs.bootstrapped-pip}/bin/pip install -e . --prefix $tmp_path >&2
fi
${postShellHook}
'';
}