[Nix-dev] per project env conf

[Kirill Elagin]

That’s because you now have the `nixos` expression instead of `nixpkgs` but
it is still misleadingly called `nixpkgs`.
I suggested this to you somewhere mid-February just as the quickest
solution to get stable nixpkgs because you wanted sass and there were some
Ruby-related changes going on in master.

Again, the quickest solution now is to replace the first line with:

~~~~
let pkgs = (import <nixpkgs> {}).pkgs;
~~~~

But it’s probably better to figure things out.
First of all, it might be the case that Ruby things on master stabilised
and you’ll be able to switch back to unstable and get sass working. I have
no idea, as I don’t use Ruby, we need an advise from someone who knows
what’s going on with Ruby in nixpkgs.
Another posibility is to be honest and rename the stable nixos channel to
`nixos` and then set `$NIX_PATH` to
`nixpkgs=$HOME/.nix-defexpr/channels/nixos/nixpkgs`. There might be a
better way to do this with `~/.nix-defexpr` but I actually still have no
idea how it works, so we need someone else’s advice here again.


On Sun, Mar 1, 2015 at 5:12 PM Catonano <catonano at gmail.com> wrote:

> 2015-01-15 15:16 GMT+01:00 Luca Bruno <lethalman88 at gmail.com>:
>
>> let pkgs = import <nixpkgs> {};
>> in pkgs.myEnvFun {
>>         name = "openArpa-env";
>>         buildInputs = with pkgs.python27Packages; [
>>           python
>>           xlrd
>>
>>         ];
>>     };
>>
>> Then nix-shell.
>>
>
> This worked. Now I'm back to this little project, as I have to process a
> new batch of files and the thing doesn't work anymore
>
> $ nix-shell
> error: attribute ‘myEnvFun’ missing, at
> "/home/catonano/Taranto/openpuglia/openArpa/default.nix":2:4
>
> I migh have installed nix-packages from scratch since then, I'm not sure
>
> Now it's
>
> $ nix-env --version
> nix-env (Nix) 1.8
>
>
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