[Nix-dev] Some beginner Nix/nixpkgs questions

[Alex Dean]

Thanks Colin - that's very helpful! Lots to go on there.

Cheers,

Alex

On Wed, Aug 5, 2015 at 7:35 PM, Colin Putney <colin at wiresong.com> wrote:

>
>
> On Wed, Aug 5, 2015 at 4:53 AM, Alex Dean <alex at snowplowanalytics.com>
> wrote:
>
>
>> On reproducible deployments using git revisions - it solves the problem,
>> but it feels like a very "out-of-band" solution.
>>
>
> You don't have to embed a git revision in your nix expressions; I don't
> like that solution much either. What we do at BetterCompany is always refer
> to nixpkgs by an expression like import <nixpkgs> {}.  Then we have
> $NIX_PATH include nixpkgs=~/.nix-defexpr/channels/nixpkgs. That means we
> can manage our version of nixpkgs using nix-channel.
>
> More generally, we include a default.nix and shell.nix in the root
> directory of all our repositories, and then have another repository similar
> to nixpkgs that bundles everything up, provides library functions etc.
> That's also in $NIX_PATH, so we can use import <ourpkgs> {} to get access
> to cross-repository dependencies, custom derivations functions etc.
>
> Finally, we tie it all together with Hydra, Nixops and a bit of custom
> code to help with deployments.
>
> Hope this helps, and I'm happy to go into more detail if you have specific
> questions.
>
> Colin
>



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