Set up nix tooling

flake.nix

@@ -0,0 +1,48 @@
+{
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+
+  outputs = { self, nixpkgs }: let
+    inherit (nixpkgs) lib;
+
+    systems = [
+      "x86_64-linux"
+      "aarch64-linux"
+    ];
+
+    forAllSystems = f: lib.genAttrs systems (system: let
+      pkgs = import nixpkgs {
+        inherit system;
+        overlays = [
+          self.overlays.${system}.default
+        ];
+      };
+    in f system pkgs);
+  in {
+    devShells = forAllSystems (system: pkgs: {
+      default = pkgs.callPackage ./nix/shell.nix { };
+    });
+
+    packages = forAllSystems (system: pkgs: with pkgs; {
+      default = self.packages.${system}.heimdal;
+
+      heimdal = pkgs.callPackage ./nix/heimdal {
+        src = lib.cleanSource ./.;
+        inherit (pkgs.darwin.apple_sdk.frameworks) CoreFoundation Security SystemConfiguration;
+        autoreconfHook = pkgs.buildPackages.autoreconfHook269;
+      };
+
+      nixosTest = pkgs.testers.runNixOSTest (import ./nix/nixosTest.nix { inherit nixpkgs; });
+    });
+
+    overlays = forAllSystems (system: pkgs: {
+      default = final: prev: {
+        heimdal = self.packages.${system}.heimdal;
+      };
+    });
+
+    nixosModules = {
+      default = self.nixosModules.heimdal;
+      heimdal = ./nix/module;
+    };
+  };
+}