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

[Daniel Hlynskyi]

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)
>>
>> _______________________________________________
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>> http://lists.science.uu.nl/mailman/listinfo/nix-dev
>>
>>
>
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