[Nix-dev] myEnvFun for IPython with Nix on openSuse host

[Luca Bruno]

What commit of nixpkgs are you tracking? Try upgrding your nixpkgs, that
should have been fixed a while ago.


On Sun, Jun 1, 2014 at 4:12 PM, Andreas Herrmann <andreash87 at gmx.ch> wrote:

> Hi everyone,
>
> I am very new to Nix, so let me apologize in advance if this ends up being
> a stupid question.
>
>
> # First, some back story:
>
> The reason I got interested in Nix is that I am doing scientific computing
> on a number of different machines with self-made simulation software.
> Hence, I need to keep my development environments in sync on these various
> machines. A tiresome task that, so far, I am performing manually. I
> understand that Nix is promising to help in such situations.
>
> So, I went ahead and installed Nix in single user mode on my laptop which
> is running on openSuse 13.1. That is, I used the install script [1], and
> installed Nix under /nix. On the wiki I found a section [2] about managing
> development environments, which introduces a thing called myEnvFun. It
> worked out for a simple environment to use numpy:
>
>     numpy = pkgs.myEnvFun {
>       name = "numpy";
>       buildInputs = with pkgs; let p27=python27Packages; in [
>         stdenv python
>         p27.readline
>         p27.numpy
>       ];
>     };
>
> I've installed it using `nix-env -i env-numpy`, and loaded it using `
> load-env-numpy`, and everything seems to work fine.
>
>     $ load-env-numpy
>     env-numpy loaded
>     $ which python
>     /nix/store/qikwsrbsyx59ygcmb36p1rgmfclgg882-python-2.7.6/bin/python
>     $ python
>     Python 2.7.6 (default, Apr 21 2014, 11:09:09)
>     [GCC 4.8.2] on linux2
>     Type "help", "copyright", "credits" or "license" for more information.
>     >>> import numpy.version
>     >>> numpy.version.version
>     '1.7.1'
>
> However, I would prefer to do develop using the IPython shell. So, I wrote
> another environment that encorporates ipython:
>
>     ipython = pkgs.myEnvFun {
>       name = "ipython";
>       buildInputs = with pkgs; let p27=python27Packages; in [
>         stdenv python
>         p27.readline
>         p27.ipython
>         p27.numpy
>       ];
>     };
>
> Installing it works just fine. Loading the environment on the other hand
> doesn't.
>
>
> # The Problem
>
> I get a huge amount errors about gdk-bug when I load the ipython
> environment defined above:
>
>     $ load-env-ipython
>     mkdir: cannot create directory ‘/lib/gdk-pixbuf-loaders-2.0/’:
> Permission denied
>     # repeated 61 times
>     mkdir: cannot create directory ‘/lib/gdk-pixbuf-loaders-2.0/’:
> Permission denied
>
> /nix/store/1j8nx7r6a7s76hj14b7lgqij7yddmvw2-gdk-pixbuf-2.30.6/nix-support/setup-hook:
> line 11: /lib/gdk-pixbuf-loaders-2.0//loaders.cache: No such file or
> directory
>     mkdir: cannot create directory ‘/lib/gdk-pixbuf-loaders-2.0/’:
> Permission denied
>     # repeated 17 times
>     mkdir: cannot create directory ‘/lib/gdk-pixbuf-loaders-2.0/’:
> Permission denied
>     env-ipython loaded
>
> Depsite the error messages, the environment seems to work.
>
>     $ ipython
>     Python 2.7.6 (default, Apr 21 2014, 11:09:09)
>     Type "copyright", "credits" or "license" for more information.
>
>     IPython 2.0.0 -- An enhanced Interactive Python.
>     ?         -> Introduction and overview of IPython's features.
>     %quickref -> Quick reference.
>     help      -> Python's own help system.
>     object?   -> Details about 'object', use 'object??' for extra details.
>
>     In [1]: import numpy
>
>     In [2]: numpy.version.version
>
>
> # My Question
>
> What is going on there? Is this because I'm using Nix on a host OS,
> instead of NixOS?
> Or, am I just missing some package in the environment? In which case,
> shouldn't Nix take care of this, and make sure all dependencies are
> available?
> One instance of a kind-of missing dependency is already the readline
> module. If I don't mention it explicitly in the environment, python is
> going to complain about it missing.
>
>
> Thanks in advance for your help. And also thanks for doing this project in
> the first place.
>
> Best regards,
>
> Andreas
>
> [1]: https://nixos.org/nix/install
> [2]:
> https://nixos.org/wiki/Howto_develop_software_on_nixos#Obtaining_an_Environment_from_a_Custom_Definition
>
>
> _______________________________________________
> nix-dev mailing list
> nix-dev at lists.science.uu.nl
> http://lists.science.uu.nl/mailman/listinfo/nix-dev
>
>


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