[Nix-dev] pypi2nix: generate full PYTHONPATH from requirements?

[Freddy Rietdijk]

Check e.g. the mopidy service
https://github.com/NixOS/nixpkgs/blob/master/nixos/modules/services/audio/mopidy.nix

Instead of `python.withPackages` `python.buildEnv.override{extralibs=...;}`
is used. `withPackages` is just a wrapper around `buildEnv`.

On Sat, Nov 5, 2016 at 10:09 PM, Daniel Hlynskyi <abcz2.uprola at gmail.com>
wrote:

> pypi2nix supports `python.withPackages`. But how should I use the created
> "environment" in NixOS service?
>
> path = [ python-env ];
>
> doesn't work
>
> 2016-11-05 22:59 GMT+02:00 Freddy Rietdijk <freddyrietdijk at fridh.nl>:
>
>> I am not familiar with the details of pypi2nix, but try and use
>> `python.withPackages` to create an environment where all packages can be
>> found by the interpreter. PYTHONPATH is still used a lot, especially with
>> modules, but we shouldn't be using it.
>>
>> http://nixos.org/nixpkgs/manual/#python
>>
>> On Sat, Nov 5, 2016 at 9:50 PM, Daniel Hlynskyi <abcz2.uprola at gmail.com>
>> wrote:
>>
>>> I'm trying to use pypi2nix-generated expression to create Kallithea
>>> service.
>>>
>>>      systemd.services.kalithea = {
>>>       after = [ "network.target" ];
>>>       wantedBy = [ "multi-user.target" ];
>>>       script =
>>>       let ppath =
>>>         concatMapStringsSep ":" (x: "${x}/${python.interpreter.python.sitePackages}")
>>> (let self = python.packages; in [
>>>           # package
>>>           self."Kallithea"
>>>           # deps
>>>           self."Babel"
>>>           self."Beaker"
>>>           self."FormEncode"
>>>           self."Mako"
>>>           self."Markdown"
>>>           self."Pygments"
>>>           self."Pylons"
>>>           self."Routes"
>>>           self."SQLAlchemy"
>>>           self."URLObject"
>>>           self."WebHelpers"
>>>           self."WebOb"
>>>           self."WebTest"
>>>           self."Whoosh"
>>>           self."celery"
>>>           self."docutils"
>>>           self."dulwich"
>>>           self."mercurial"
>>>           self."mock"
>>>           self."py-bcrypt"
>>>           self."python-dateutil"
>>>           self."waitress"
>>>           # second level deps
>>>           self."MarkupSafe"
>>>           self."funcsigs"
>>>           self."pbr"
>>>           self."six"
>>>           # TODO: add all the others
>>>         ]);
>>>       in ''
>>>         export PYTHONPATH=${ppath}
>>>         ${pythonPackages.pasteScript}/bin/paster serve
>>> ${kallithea1}/etc/development.ini;
>>>       '';
>>>     };
>>>
>>> So I need to feed PYTHONPATH into service, but I don't know a nice way
>>> to recursively aggregate all the propagatedBuildInputs from Kallithea into
>>> full PYTHONPATH
>>> (and service wants all of them, as far as I understand)
>>>
>>> So, is there a way to do this? I'm pretty new to Python infrastructure
>>> and perhaps miss some obvious thing.
>>>
>>> PS. Pinging my previous ask about PERL5LIB, which is an example of exact
>>> this problem, but with Perl.
>>>
>>> https://www.mail-archive.com/nix-dev@lists.science.uu.nl/msg22577.html
>>>
>>> The solution I found breaks on Travis (I guess, it is of kind "import
>>> from derivation", so it won't work generally)
>>>
>>> _______________________________________________
>>> nix-dev mailing list
>>> nix-dev at lists.science.uu.nl
>>> http://lists.science.uu.nl/mailman/listinfo/nix-dev
>>>
>>>
>>
>
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