flake: automatically define nixosConfigurations from dir

flake.nix

@@ -49,44 +49,20 @@
 
   outputs = { self, nixpkgs, home-manager, utils, nixvim, ... }@inputs:
     let
-      makeSystem = conf:
-        nixpkgs.lib.nixosSystem (nixpkgs.lib.recursiveUpdate conf rec {
+      baseDir = ./system;
+      lib = nixpkgs.lib;
+      makeSystem = module:
+        lib.nixosSystem (rec {
           specialArgs = { inherit inputs; };
           modules = [
             home-manager.nixosModules.home-manager
             { home-manager.extraSpecialArgs = specialArgs; }
-          ] ++ (conf.modules or [ ]);
+          ] ++ [ module ];
         });
     in {
-      nixosConfigurations.starlight = makeSystem {
-        system = "x86_64-linux";
-        modules = [ ./system/starlight ];
-      };
-
-      nixosConfigurations.rainbowdash = makeSystem {
-        system = "x86_64-linux";
-        modules = [ ./system/rainbowdash ];
-      };
-
-      nixosConfigurations.spike = makeSystem {
-        system = "x86_64-linux";
-        modules = [ ./system/spike ];
-      };
-
-      nixosConfigurations.gallus = makeSystem {
-        system = "x86_64-linux";
-        modules = [ ./system/gallus ];
-      };
-
-      nixosConfigurations.mistmane = makeSystem {
-        system = "aarch64-linux";
-        modules = [ ./system/mistmane ];
-      };
-
-      nixosConfigurations.smolder = makeSystem {
-        system = "aarch64-linux";
-        modules = [ ./system/smolder ];
-      };
+      nixosConfigurations =
+        lib.mapAttrs (name: _: makeSystem (baseDir + "/${name}"))
+        (builtins.readDir baseDir);
     } // utils.lib.eachDefaultSystem (system:
       let pkgs = import nixpkgs { inherit system; };
       in {

system/mistmane/default.nix

@@ -46,5 +46,6 @@
     extraConfig = lib.mkForce "HandlePowerKey=lock";
   };
 
+  nixpkgs.hostPlatform = "aarch64-linux";
   system.stateVersion = "21.11";
 }

system/rainbowdash/default.nix

@@ -89,5 +89,6 @@
 
   networking.domain = "manehattan.artem.ist";
   networking.hostName = "rainbowdash";
+  nixpkgs.hostPlatform = "x86_64-linux";
   system.stateVersion = "20.03";
 }

system/starlight/default.nix

@@ -137,5 +137,6 @@
   # oh god
   system.includeBuildDependencies = true;
   # NixOS
+  nixpkgs.hostPlatform = "x86_64-linux";
   system.stateVersion = "21.11";
 }