nixpkgs/pkgs/development/interpreters/python/hooks/pip-install-hook.sh
Frederik Rietdijk f7e28bf5d8 Split buildPythonPackage into setup hooks
This commit splits the `buildPythonPackage` into multiple setup hooks.

Generally, Python packages are built from source to wheels using `setuptools`.
The wheels are then installed with `pip`. Tests were often called with
`python setup.py test` but this is less common nowadays. Most projects
now use a different entry point for running tests, typically `pytest`
or `nosetests`.

Since the wheel format was introduced more tools were built to generate these,
e.g. `flit`. Since PEP 517 is provisionally accepted, defining a build-system
independent format (`pyproject.toml`), `pip` can now use that format to
execute the correct build-system.

In the past I've added support for PEP 517 (`pyproject`) to the Python
builder, resulting in a now rather large builder. Furthermore, it was not possible
to reuse components elsewhere. Therefore, the builder is now split into multiple
setup hooks.

The `setuptoolsCheckHook` is included now by default but in time it should
be removed from `buildPythonPackage` to make it easier to use another hook
(curently one has to pass in `dontUseSetuptoolsCheck`).
2019-09-06 15:18:45 +02:00

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# Setup hook for pip.
echo "Sourcing pip-install-hook"
declare -a pipInstallFlags
pipInstallPhase() {
echo "Executing pipInstallPhase"
runHook preInstall
mkdir -p "$out/@pythonSitePackages@"
export PYTHONPATH="$out/@pythonSitePackages@:$PYTHONPATH"
pushd dist || return 1
@pythonInterpreter@ -m pip install ./*.whl --no-index --prefix="$out" --no-cache $pipInstallFlags --build tmpbuild
popd || return 1
runHook postInstall
echo "Finished executing pipInstallPhase"
}
if [ -z "$dontUsePipInstall" ] && [ -z "$installPhase" ]; then
echo "Using pipInstallPhase"
installPhase=pipInstallPhase
fi