I think I figured it out. Here are the steps to get stable nixpkgs:
~~~~
$ nix-channel --remove nixos
$ nix-channel --remove nixpkgs
$ nix-channel --add https://nixos.org/channels/nixos-14.12 nixos
$ nix-channel --update
$ ln -s ~/.nix-defexpr/channels/nixos/nixpkgs ~/.nix-defexpr/nixpkgs
$ export NIX_PATH=nixpkgs=$HOME/.nix-defexpr/nixpkgs
~~~~
And the last step is to put the last line (`export
NIX_PATH=nixpkgs=$HOME/.nix-defexpr/nixpkgs`) into `~/.profile` or
something like that.
After this your original `shell.nix` should work without modifications I
suggested in my previous message.
On Mon, Mar 2, 2015 at 11:29 AM Kirill Elagin <kirela...@gmail.com> wrote:
> 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 <caton...@gmail.com> wrote:
>
>> 2015-01-15 15:16 GMT+01:00 Luca Bruno <lethalma...@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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>> nix-dev@lists.science.uu.nl
>> http://lists.science.uu.nl/mailman/listinfo/nix-dev
>>
>
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