add nix support for dev

[m0ssc0de]

No description provided.

[cla-bot-2021]

User @m0ssc0de, please sign the CLA here.

[gilescope]

https://gutier.io/post/development-using-rust-with-nix/ - I think people are switching over to oxalica (The company steve K works for) rather than mozilla as the base these days.

[bernardoaraujor]

I ran a successful build with the proposed shell.nix on my NixOS setup, which probably means the PR is ok.

I'm a bit confused about the dependencies though.
Given the prerequisites, why is it enough that shell.nix has no mentions to PostgresSQL?

[ggwpez]

I'm a bit confused about the dependencies though. Given the prerequisites, why is it enough that shell.nix has no mentions to PostgresSQL?

Maybe for running the tests?
I think if we want to to fully support this we should add a CI build+test step.

[bernardoaraujor]

I'm a bit confused about the dependencies though. Given the prerequisites, why is it enough that shell.nix has no mentions to PostgresSQL?

Maybe for running the tests?
I think if we want to to fully support this we should add a CI build+test step.

CI build+test is indeed important for long term sustainability.

I submitted a similar shell.nix PR to substrate-contracts-node recently but the ink! team rejected it based on the maintenance burden it would add to them.

Perhaps the code owner of this project should be on the loop.

[dvdplm]

Perhaps the code owner of this project should be on the loop.

We're here reading. Not nix users ourselves (yet) so you are indeed correct that this would have to be community maintained and it is a concern. I'm not opposed to adding it if we see active users step up.

[insipx]

This looks good (if it's decided nix is ok to use for archive), I can post my old nix config too if that's of interest. I think Oxalica is definitely better for managing rust dependencies IMO.