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nixpkgs/pkgs/development/interpreters/python/hooks/pip-build-hook.sh
Daniël de Kok e2309df85e pythonPackages.pipBuildHook: 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 to use for pip projects
echo "Sourcing pip-build-hook"
pipBuildPhase() {
echo "Executing pipBuildPhase"
runHook preBuild
mkdir -p dist
echo "Creating a wheel..."
@pythonInterpreter@ -m pip wheel --no-index --no-deps --no-clean --no-build-isolation --wheel-dir dist .
echo "Finished creating a wheel..."
runHook postBuild
echo "Finished executing pipBuildPhase"
}
pipShellHook() {
echo "Executing pipShellHook"
runHook preShellHook
# Long-term setup.py should be dropped.
if [ -e pyproject.toml ]; then
tmp_path=$(mktemp -d)
export PATH="$tmp_path/bin:$PATH"
export PYTHONPATH="$tmp_path/@pythonSitePackages@:$PYTHONPATH"
mkdir -p "$tmp_path/@pythonSitePackages@"
@pythonInterpreter@ -m pip install -e . --prefix "$tmp_path" \
--no-build-isolation >&2
fi
runHook postShellHook
echo "Finished executing pipShellHook"
}
if [ -z "${dontUsePipBuild-}" ] && [ -z "${buildPhase-}" ]; then
echo "Using pipBuildPhase"
buildPhase=pipBuildPhase
fi
if [ -z "${shellHook-}" ]; then
echo "Using pipShellHook"
shellHook=pipShellHook
fi