A corner case is where the package is importable because it is on $PYTHONPATH and so the $virtual_env at runtime is different than the one at install time. That is why it might be useful to store the data directory per-package. wheel.install.get_install_paths(package_name) shows where things would be installed according to wheel. It comes from a call to distutils. pip has its own implementation. On my machine data goes into $virtualenv in a virtualenv and into /usr on system python.
On Fri, Sep 14, 2018 at 11:26 AM Paul Moore <p.f.mo...@gmail.com> wrote: > On Fri, 14 Sep 2018 at 16:03, Daniel Holth <dho...@gmail.com> wrote: > > > > It can be hard to predict where data went at runtime. > > I don't think it's "hard to predict". I *do* think it's badly > documented/not standardised. See my previous note - pip installs into > the install_data location that setuptools/distutils chooses. Ideally: > > a) Setuptools and/or distutils would document where that is clearly > and in an easy to find location. > b) There should be a standard defining "schemes" like this so that the > choices aren't implementation-defined (by pip, setuptools and > distutils in some weird combination). > > Of course "there should be..." means "someone who cares enough needs > to invest time in..." :-( > > > Maybe we could record its path in .dist-info during the install. I > think it may also not be clear how to put files into wheel's data directory > from setup.py. > > Better would be to have a supported library that exposes the logic pip > uses (or as I said above, the standard-defined logic) to determine > such paths. See https://github.com/pypa/pip/issues/5191 > > > If we added more categories it would allow the installer to override > e.g. just the config directory rather than copying a Unix-like tree under > data/ onto the install path. > > That's a reasonable but somewhat unrelated suggestion. I don't think > it's needed for the OP's use case, but it may well be helpful for > others. > > Paul >
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