nixpkgs/pkgs/development/python-modules/bootstrapped-pip/default.nix

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{ stdenv, python, fetchPypi, makeWrapper, unzip }:
let
wheel_source = fetchPypi {
pname = "wheel";
version = "0.33.1";
format = "wheel";
sha256 = "8eb4a788b3aec8abf5ff68d4165441bc57420c9f64ca5f471f58c3969fe08668";
};
setuptools_source = fetchPypi {
pname = "setuptools";
version = "41.0.0";
format = "wheel";
sha256 = "e67486071cd5cdeba783bd0b64f5f30784ff855b35071c8670551fd7fc52d4a1";
};
in stdenv.mkDerivation rec {
pname = "pip";
version = "19.0.3";
name = "${python.libPrefix}-bootstrapped-${pname}-${version}";
src = fetchPypi {
inherit pname version;
format = "wheel";
sha256 = "bd812612bbd8ba84159d9ddc0266b7fbce712fc9bc98c82dee5750546ec8ec64";
};
unpackPhase = ''
mkdir -p $out/${python.sitePackages}
unzip -d $out/${python.sitePackages} $src
unzip -d $out/${python.sitePackages} ${setuptools_source}
unzip -d $out/${python.sitePackages} ${wheel_source}
'';
patchPhase = ''
mkdir -p $out/bin
'';
nativeBuildInputs = [ makeWrapper unzip ];
buildInputs = [ python ];
installPhase = ''
# install pip binary
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echo '#!${python.interpreter}' > $out/bin/pip
echo 'import sys;from pip._internal import main' >> $out/bin/pip
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echo 'sys.exit(main())' >> $out/bin/pip
chmod +x $out/bin/pip
# wrap binaries with PYTHONPATH
for f in $out/bin/*; do
wrapProgram $f --prefix PYTHONPATH ":" $out/${python.sitePackages}/
done
'';
}