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/* This function provides a generic Python package builder. It is
intended to work with packages that use `setuptools'
(http://pypi.python.org/pypi/setuptools/), which represents a large
number of Python packages nowadays. */
{ python, setuptools, makeWrapper, lib }:
attrs:
let
# Return the list of recursively propagated build inputs of PKG.
recursiveBuildInputs =
pkg:
[ pkg ] ++
(if pkg ? propagatedBuildInputs
then lib.concatLists (map recursiveBuildInputs
pkg.propagatedBuildInputs)
else []);
in
python.stdenv.mkDerivation rec {
inherit (attrs) src meta;
name = "python-" + attrs.name;
buildInputs = [ python setuptools makeWrapper ] ++
(if attrs ? buildInputs then attrs.buildInputs else []);
propagatedBuildInputs = [ setuptools ] ++
(if attrs ? propagatedBuildInputs
then attrs.propagatedBuildInputs
else []);
buildPhase = "true";
doCheck =
(if attrs ? doCheck
then attrs.doCheck
else true);
# Many packages, but not all, support this.
checkPhase = "python setup.py test";
installPhase = ''
ensureDir "$out/lib/${python.libPrefix}/site-packages"
echo "installing \`${name}' with \`easy_install'..."
export PYTHONPATH="$out/lib/${python.libPrefix}/site-packages:$PYTHONPATH"
easy_install --prefix="$out" .
'';
postFixup = ''
# Wrap scripts that are under `{s,}bin/' so that they get the right
# $PYTHONPATH.
for i in "$out/bin/"* "$out/sbin/"*
do
if head -n1 "$i" | grep -q "${python}"
then
echo "wrapping \`$i'..."
wrapProgram "$i" \
--prefix PYTHONPATH ":" \
${lib.concatStringsSep ":"
([ "$out/lib/${python.libPrefix}/site-packages" ] ++
(map (path: path + "/lib/${python.libPrefix}/site-packages")
(lib.concatMap recursiveBuildInputs
propagatedBuildInputs)))}
fi
done
# If a user installs a Python package, she probably also wants its
# dependencies in the user environment (since Python modules don't
# have something like an RPATH, so the only way to find the
# dependencies is to have them in the PYTHONPATH variable).
if test -e $out/nix-support/propagated-build-inputs; then
ln -s $out/nix-support/propagated-build-inputs $out/nix-support/propagated-user-env-packages
fi
'';
}
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