77 lines
2.6 KiB
Nix
77 lines
2.6 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, makeWrapper, lib }:
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{ name, src, meta, patches ? [], doCheck ? true, ... } @ attrs:
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let
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# Return the list of recursively propagated build inputs of PKG.
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recursiveBuildInputs =
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pkg:
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[ pkg ] ++
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(if pkg ? propagatedBuildInputs
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then lib.concatLists (map recursiveBuildInputs
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pkg.propagatedBuildInputs)
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else []);
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in
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python.stdenv.mkDerivation rec {
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inherit src meta patches doCheck;
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name = "python-" + attrs.name;
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buildInputs = [ python setuptools makeWrapper ] ++
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(if attrs ? buildInputs then attrs.buildInputs else []);
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propagatedBuildInputs = [ setuptools ] ++
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(if attrs ? propagatedBuildInputs
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then attrs.propagatedBuildInputs
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else []);
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buildPhase = "true";
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# Many packages, but not all, support this.
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checkPhase = "python setup.py test";
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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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ensureDir "$out/lib/${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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easy_install --prefix="$out" .
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'';
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postFixup = ''
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# Wrap scripts that are under `{s,}bin/' so that they get the right
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# $PYTHONPATH.
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for i in "$out/bin/"* "$out/sbin/"*
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do
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if head -n1 "$i" | grep -q "${python}"
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then
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echo "wrapping \`$i'..."
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wrapProgram "$i" \
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--prefix PYTHONPATH ":" \
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${lib.concatStringsSep ":"
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([ "$out/lib/${python.libPrefix}/site-packages" ] ++
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(map (path: path + "/lib/${python.libPrefix}/site-packages")
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(lib.concatMap recursiveBuildInputs
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propagatedBuildInputs)))}
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fi
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done
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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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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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