nixpkgs/pkgs/development/python-modules/generic/default.nix
Florian Friesdorf 013c915777 Revert "enable preConfigure for python packages again"
This reverts commit a513314290ba0d78400ea4902301f421e0fecdd2.

svn path=/nixpkgs/branches/stdenv-updates/; revision=32642
2012-02-28 00:06:46 +00:00

121 lines
4.2 KiB
Nix

/* 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, wrapPython, lib, site, offlineDistutils, unzip }:
{ name, namePrefix ? "python-"
, buildInputs ? []
, # List of packages that should be added to the PYTHONPATH
# environment variable in programs built by this function. Packages
# in the standard `propagatedBuildInputs' variable are also added.
# The difference is that `pythonPath' is not propagated to the user
# environment. This is preferrable for programs because it doesn't
# pollute the user environment.
pythonPath ? []
# distutils registers dependencies in .pth (good) but also creates
# console_scripts for dependencies in bin/ (bad). easy_install
# creates no scripts for dependencies (good) but does not register
# them in pth neither (bad) - the combination gives us a pth with
# dependencies and scripts only for the package we are currently
# installing.
, installCommand ?
''
# install the current package with easy_install.pth including dependencies
python setup.py install --prefix="$out"
# plain distutils knows no dependencies
eapth="$out"/lib/${python.libPrefix}/site-packages/easy-install.pth
if [ -e "$eapth" ]; then
# remove console_scripts again, because they were created for deps, too
rm -Rf "$out"/bin
# run easy_install to generate scripts for the current package,
# it won't reinstall
easy_install --prefix="$out" .
# move colliding easy_install.pth to specifically named one
mv "$eapth" $(dirname "$eapth")/${name}.pth
fi
# These cause collisions and our output is not a site anyway
# If you need a site, install python-site
rm -f "$out/lib/${python.libPrefix}/site-packages/"site.py*
# If setuptools is a dependency, it is included in $(name}.pth
rm -f "$out/lib/${python.libPrefix}/site-packages/setuptools.pth"
''
, buildPhase ? "true"
, doCheck ? true
# run after fixupPhase
, checkPhase ?
''
runHook preCheck
python setup.py test
runHook postCheck
''
, postInstall ? ""
, ... } @ attrs:
# Keep extra attributes from ATTR, e.g., `patchPhase', etc.
python.stdenv.mkDerivation (attrs // {
inherit doCheck buildPhase checkPhase;
# moves checkPhase from after buildPhase to after fixupPhase
builder = ./builder.sh;
name = namePrefix + name;
buildInputs = [ python wrapPython setuptools unzip ] ++ buildInputs ++ pythonPath;
preConfigure = ''
# do not allow distutils to make downloads, whatever install command is used
export PYTHONPATH="${setuptools}/lib/${python.libPrefix}:$PYTHONPATH"
export PYTHONPATH="${offlineDistutils}/lib/${python.libPrefix}:$PYTHONPATH"
# enable pth files for dependencies
export PYTHONPATH="${site}/lib/${python.libPrefix}/site-packages:$PYTHONPATH"
'';
# XXX: I think setuptools is not needed here
pythonPath = [ setuptools site ] ++ pythonPath;
# XXX: Should we run `easy_install --always-unzip'? It doesn't seem
# to have a noticeable impact on small scripts.
installPhase = ''
mkdir -p "$out/lib/${python.libPrefix}/site-packages"
echo "installing \`${name}' with \`easy_install'..."
export PYTHONPATH="$out/lib/${python.libPrefix}/site-packages:$PYTHONPATH"
${installCommand}
${postInstall}
'';
postFixup =
''
wrapPythonPrograms
# 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).
#
# XXX: this is not needed for things to work (pth pulls in deps)
# but would be nice to have anyway - However, python deps end up
# in propagated-build-native-inputs
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
'';
})