naersk/README.tpl.md

Naersk

Nix support for building cargo crates.

• Install
• Configuration
• Comparison

Install

Use niv:

$ niv add nmattia/naersk

And then

let
    pkgs = import <nixpkgs> {};
    sources = import ./nix/sources.nix;
    naersk = pkgs.callPackage sources.naersk {};
in naersk.buildPackage ./path/to/rust

NOTE: ./path/to/rust/ should contain a Cargo.lock.

Configuration

The buildPackage function also accepts an attribute set. The attributes are described below. Any attribute that is not listed below will be forwarded as is to stdenv.mkDerivation. When the argument passed in not an attribute set, e.g.

naersk.buildPackage theArg

it is converted to an attribute set equivalent to { root = theArg; }.

GEN_CONFIGURATION

Using naersk with nixpkgs-mozilla

The nixpkgs-mozilla overlay provides nightly versions of rustc and cargo. Below is an example setup for using it with naersk:

let
  sources = import ./nix/sources.nix;
  nixpkgs-mozilla = import sources.nixpkgs-mozilla;
  pkgs = import sources.nixpkgs {
    overlays =
      [
        nixpkgs-mozilla
        (self: super:
            {
              rustc = self.latest.rustChannels.nightly.rust;
              cargo = self.latest.rustChannels.nightly.rust;
            }
        )
      ];
  };
  naersk = pkgs.callPackage sources.naersk {};
in
naersk.buildPackage ./my-package

Using with Nix Flakes

Initialize flakes within your repo by running:

nix flake init -t github:nmattia/naersk
nix flake lock

Alternatively, copy this flake.nix into your repo.

{
  inputs = {
    utils.url = "github:numtide/flake-utils";
    naersk.url = "github:nmattia/naersk";
  };

  outputs = { self, nixpkgs, utils, naersk }:
    utils.lib.eachDefaultSystem (system: let
      pkgs = nixpkgs.legacyPackages."${system}";
      naersk-lib = naersk.lib."${system}";
    in rec {
      # `nix build`
      packages.my-project = naersk-lib.buildPackage {
        pname = "my-project";
        root = ./.;
      };
      defaultPackage = packages.my-project;

      # `nix run`
      apps.my-project = utils.lib.mkApp {
        drv = packages.my-project;
      };
      defaultApp = apps.my-project;

      # `nix develop`
      devShell = pkgs.mkShell {
        nativeBuildInputs = with pkgs; [ rustc cargo ];
      };
    });
}

If you want to use a specific toolchain version instead of the latest stable available in nixpkgs, you can use mozilla's nixpkgs overlay in your flake.

{
  inputs = {
    utils.url = "github:numtide/flake-utils";
    naersk.url = "github:nmattia/naersk";
    mozillapkgs = {
      url = "github:mozilla/nixpkgs-mozilla";
      flake = false;
    };
  };

  outputs = { self, nixpkgs, utils, naersk, mozillapkgs }:
    utils.lib.eachDefaultSystem (system: let
      pkgs = nixpkgs.legacyPackages."${system}";

      # Get a specific rust version
      mozilla = pkgs.callPackage (mozillapkgs + "/package-set.nix") {};
      rust = (mozilla.rustChannelOf {
        date = "2020-01-01"; # get the current date with `date -I`
        channel = "nightly";
        sha256 = "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA=";
      }).rust;

      # Override the version used in naersk
      naersk-lib = naersk.lib."${system}".override {
        cargo = rust;
        rustc = rust;
      };
    in rec {
      # `nix build`
      packages.my-project = naersk-lib.buildPackage {
        pname = "my-project";
        root = ./.;
      };
      defaultPackage = packages.my-project;

      # `nix run`
      apps.my-project = utils.lib.mkApp {
        drv = packages.my-project;
      };
      defaultApp = apps.my-project;

      # `nix develop`
      devShell = pkgs.mkShell {
        # supply the specific rust version
        nativeBuildInputs = [ rust ];
      };
    });
}