[Nix-dev] per project env conf

[Domen Kožar]

Please don't use myEnvFun, it's not documented and superseeded by nix-shell.

See Development/Python section in nixpkgs manual:
http://nixos.org/nixpkgs/manual/#python

On Mon, Mar 2, 2015 at 9:58 AM, Kirill Elagin <kirelagin at gmail.com> wrote:

> 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 <kirelagin at 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 <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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>>
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