177 lines
5.9 KiB
Nix
177 lines
5.9 KiB
Nix
/* This function provides a generic Python package builder. It is
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intended to work with packages that use `distutils/setuptools'
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(http://pypi.python.org/pypi/setuptools/), which represents a large
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number of Python packages nowadays. */
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{ python, setuptools, unzip, wrapPython, lib, recursivePthLoader, distutils-cfg }:
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{ name
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# by default prefix `name` e.g. "python3.3-${name}"
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, namePrefix ? python.libPrefix + "-"
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, buildInputs ? []
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# pass extra information to the distutils global configuration (think as global setup.cfg)
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, distutilsExtraCfg ? ""
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# propagate build dependencies so in case we have A -> B -> C,
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# C can import propagated packages by A
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, propagatedBuildInputs ? []
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# passed to "python setup.py install"
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, setupPyInstallFlags ? []
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# passed to "python setup.py build"
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, setupPyBuildFlags ? []
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# enable tests by default
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, doCheck ? true
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# List of packages that should be added to the PYTHONPATH
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# environment variable in programs built by this function. Packages
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# in the standard `propagatedBuildInputs' variable are also added.
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# The difference is that `pythonPath' is not propagated to the user
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# environment. This is preferrable for programs because it doesn't
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# pollute the user environment.
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, pythonPath ? []
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, meta ? {}
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# Execute before shell hook
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, preShellHook ? ""
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# Execute after shell hook
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, postShellHook ? ""
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, ... } @ attrs:
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# Keep extra attributes from `attrs`, e.g., `patchPhase', etc.
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python.stdenv.mkDerivation (attrs // {
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inherit doCheck;
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name = namePrefix + name;
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buildInputs = [
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python wrapPython setuptools
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(distutils-cfg.override { extraCfg = distutilsExtraCfg; })
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] ++ buildInputs ++ pythonPath
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++ (lib.optional (lib.hasSuffix "zip" attrs.src.name or "") unzip);
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propagatedBuildInputs = propagatedBuildInputs ++ [ recursivePthLoader ];
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pythonPath = [ setuptools ] ++ pythonPath;
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configurePhase = attrs.configurePhase or ''
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runHook preConfigure
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# patch python interpreter to write null timestamps when compiling python files
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# with following var we tell python to activate the patch so that python doesn't
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# try to update them when we freeze timestamps in nix store
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export DETERMINISTIC_BUILD=1
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# prepend following line to import setuptools before distutils
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# this way we make sure setuptools monkeypatches distutils commands
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# this way setuptools provides extra helpers such as "python setup.py test"
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sed -i '0,/import distutils/s//import setuptools;import distutils/' setup.py
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sed -i '0,/from distutils/s//import setuptools;from distutils/' setup.py
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runHook postConfigure
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'';
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checkPhase = attrs.checkPhase or ''
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runHook preCheck
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${python}/bin/${python.executable} setup.py test
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runHook postCheck
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'';
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buildPhase = attrs.buildPhase or ''
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runHook preBuild
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${python}/bin/${python.executable} setup.py build ${lib.concatStringsSep " " setupPyBuildFlags}
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runHook postBuild
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'';
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installPhase = attrs.installPhase or ''
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runHook preInstall
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mkdir -p "$out/lib/${python.libPrefix}/site-packages"
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export PYTHONPATH="$out/lib/${python.libPrefix}/site-packages:$PYTHONPATH"
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${python}/bin/${python.executable} setup.py install \
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--install-lib=$out/lib/${python.libPrefix}/site-packages \
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--old-and-unmanageable \
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--prefix="$out" ${lib.concatStringsSep " " setupPyInstallFlags}
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# --install-lib:
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# sometimes packages specify where files should be installed outside the usual
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# python lib prefix, we override that back so all infrastructure (setup hooks)
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# work as expected
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# --old-and-unmanagable:
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# instruct setuptools not to use eggs but fallback to plan package install
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# this also reduces one .pth file in the chain, but the main reason is to
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# force install process to install only scripts for the package we are
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# installing (otherwise it will install scripts also for dependencies)
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# A pth file might have been generated to load the package from
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# within its own site-packages, rename this package not to
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# collide with others.
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eapth="$out/lib/${python.libPrefix}"/site-packages/easy-install.pth
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if [ -e "$eapth" ]; then
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# move colliding easy_install.pth to specifically named one
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mv "$eapth" $(dirname "$eapth")/${name}.pth
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fi
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# Remove any site.py files generated by easy_install as these
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# cause collisions. If pth files are to be processed a
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# corresponding site.py needs to be included in the PYTHONPATH.
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rm -f "$out/lib/${python.libPrefix}"/site-packages/site.py*
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runHook postInstall
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'';
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postFixup =
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''
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wrapPythonPrograms
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# If a user installs a Python package, they probably also wants its
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# dependencies in the user environment profile (only way to find the
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# dependencies is to have them in the PYTHONPATH variable).
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# Allows you to do: $ PYTHONPATH=~/.nix-profile/lib/python2.7/site-packages python
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if test -e $out/nix-support/propagated-build-inputs; then
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ln -s $out/nix-support/propagated-build-inputs $out/nix-support/propagated-user-env-packages
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fi
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# TODO: document
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createBuildInputsPth build-inputs "$buildInputStrings"
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for inputsfile in propagated-build-inputs propagated-native-build-inputs; do
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if test -e $out/nix-support/$inputsfile; then
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createBuildInputsPth $inputsfile "$(cat $out/nix-support/$inputsfile)"
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fi
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done
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'';
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shellHook = attrs.shellHook or ''
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mkdir -p /tmp/$name/lib/${python.libPrefix}/site-packages
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${preShellHook}
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export PATH="/tmp/$name/bin:$PATH"
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export PYTHONPATH="/tmp/$name/lib/${python.libPrefix}/site-packages:$PYTHONPATH"
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python setup.py develop --prefix /tmp/$name
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${postShellHook}
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return
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'';
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meta = with lib.maintainers; {
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# default to python's platforms
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platforms = python.meta.platforms;
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} // meta // {
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# add extra maintainer(s) to every package
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maintainers = (meta.maintainers or []) ++ [ chaoflow iElectric ];
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};
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})
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