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103 lines
3.4 KiB
Nix
103 lines
3.4 KiB
Nix
/* This function provides a generic Python package builder. It is
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intended to work with packages that use `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, wrapPython, lib }:
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{ name, namePrefix ? "python-"
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, buildInputs ? []
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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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# distutils registers dependencies in .pth (good) but also creates
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# console_scripts for dependencies in bin/ (bad). easy_install
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# creates no scripts for dependencies (good) but does not register
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# them in pth neither (bad) - the combination gives us a pth with
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# dependencies and scripts only for the package we are currently
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# installing.
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, installCommand ?
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''
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# install the current package with easy_install.pth including dependencies
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python setup.py install --prefix="$out"
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# remove console_scripts again, because they were created for deps, too
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rm -Rf "$out"/bin
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# run easy_install to generate scripts for the current package,
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# it won't reinstall
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easy_install --prefix="$out" .
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# move colliding easy_install.pth to specifically named one
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mv "$out/lib/${python.libPrefix}/site-packages/"{easy-install.pth,${name}.pth}
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# These cause collisions and our output is not a site anyway
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# If you need a site, install python-site
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rm -f "$out/lib/${python.libPrefix}/site-packages/"site.py*
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# If setuptools is a dependency, it is included in $(name}.pth
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rm -f "$out/lib/${python.libPrefix}/site-packages/setuptools.pth"
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''
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, buildPhase ? "true"
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, doCheck ? true
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, checkPhase ?
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''
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runHook preCheck
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python setup.py test
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runHook postCheck
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''
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, postInstall ? ""
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, ... } @ attrs:
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# Keep extra attributes from ATTR, e.g., `patchPhase', etc.
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python.stdenv.mkDerivation (attrs // {
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inherit doCheck buildPhase checkPhase;
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name = namePrefix + name;
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buildInputs = [ python wrapPython setuptools ] ++ buildInputs ++ pythonPath;
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pythonPath = [ setuptools] ++ pythonPath;
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# XXX: Should we run `easy_install --always-unzip'? It doesn't seem
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# to have a noticeable impact on small scripts.
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installPhase = ''
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mkdir -p "$out/lib/${python.libPrefix}/site-packages"
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echo "installing \`${name}' with \`easy_install'..."
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export PYTHONPATH="$out/lib/${python.libPrefix}/site-packages:$PYTHONPATH"
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${installCommand}
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${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, she probably also wants its
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# dependencies in the user environment (since Python modules don't
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# have something like an RPATH, so the only way to find the
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# dependencies is to have them in the PYTHONPATH variable).
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#
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# XXX: this is not needed for things to work (pth pulls in deps)
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# but would be nice to have anyway - However, python deps end up
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# in propagated-build-native-inputs
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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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'';
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})
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