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nixpkgs/pkgs/development/interpreters/python/hooks/setuptools-build-hook.sh
Daniël de Kok 1e2b6695cf pythonPackages.setuptoolsBuildHook: do not build in an isolated environment
When a PEP 517 project file is present, pip will not install
prerequisites in `site-packages`:

https://pip.pypa.io/en/stable/reference/pip/#pep-517-and-518-support

For the shell hook, this has the consequence that the generated
temporary directory that is added to PYTHONPATH does not contain
`site.py`. As a result, Python does not discover the Python
module. Thus when a user executes nix-shell in a project, they cannot
import the project's Python module.

This change adds the `--no-build-isolation` option to pip when
creating the editable environment, to correctly generate `site.py`,
even when a `pyproject.toml` is present.
2020-06-06 10:05:26 +02:00

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# Setup hook for setuptools.
echo "Sourcing setuptools-build-hook"
setuptoolsBuildPhase() {
echo "Executing setuptoolsBuildPhase"
local args
runHook preBuild
cp -f @setuppy@ nix_run_setup
args=""
if [ -n "$setupPyGlobalFlags" ]; then
args+="$setupPyGlobalFlags"
fi
if [ -n "$setupPyBuildFlags" ]; then
args+="build_ext $setupPyBuildFlags"
fi
eval "@pythonInterpreter@ nix_run_setup $args bdist_wheel"
runHook postBuild
echo "Finished executing setuptoolsBuildPhase"
}
setuptoolsShellHook() {
echo "Executing setuptoolsShellHook"
runHook preShellHook
if test -e setup.py; then
tmp_path=$(mktemp -d)
export PATH="$tmp_path/bin:$PATH"
export PYTHONPATH="$tmp_path/@pythonSitePackages@:$PYTHONPATH"
mkdir -p "$tmp_path/@pythonSitePackages@"
eval "@pythonInterpreter@ -m pip install -e . --prefix $tmp_path \
--no-build-isolation >&2"
fi
runHook postShellHook
echo "Finished executing setuptoolsShellHook"
}
if [ -z "${dontUseSetuptoolsBuild-}" ] && [ -z "${buildPhase-}" ]; then
echo "Using setuptoolsBuildPhase"
buildPhase=setuptoolsBuildPhase
fi
if [ -z "${dontUseSetuptoolsShellHook-}" ] && [ -z "${shellHook-}" ]; then
echo "Using setuptoolsShellHook"
shellHook=setuptoolsShellHook
fi