simplify flake functions

flake.nix

@@ -40,20 +40,15 @@
       pkgs-unstable = nixpkgs-unstable.legacyPackages.${system};
       machines = import ./nixos/machines;
       physicalMachines = lib.filterAttrs (n: v: v.type == "physical") machines;
-      # TODO: Use mergeAttrLists
       mkNixosSystems = systemDef:
-        nixpkgs.lib.foldlAttrs
-          (acc: name: machine:
-            acc // {
-              "${name}" = nixpkgs.lib.nixosSystem (systemDef name machine);
-            })
-          { }
+        builtins.mapAttrs
+          (name: machine:
+            nixpkgs.lib.nixosSystem (systemDef name machine)
+          )
           physicalMachines;
       mkDeployNodes = nodeDef:
-        # TODO: Use mergeAttrLists
-        nixpkgs.lib.foldlAttrs
-          (acc: name: machine: acc // { "${name}" = nodeDef name machine; })
-          { }
+        builtins.mapAttrs
+          (name: machine: nodeDef name machine)
           physicalMachines;
     in
     {

nixos/machines/default.nix

@@ -1,6 +1,5 @@
 {
   jefke = {
-    # TODO: model this in a nixos module?
     type = "physical";
 
     nixosModule = {
@@ -57,7 +56,7 @@
   lewis = {
     type = "physical";
 
-    nixosModule = { pkgs, ... }: {
+    nixosModule = {
       networking.hostName = "lewis";
 
       lab = {
@@ -81,14 +80,13 @@
     type = "virtual";
     hypervisorName = "lewis";
 
-    nixosModule = { pkgs, config, ... }: {
+    nixosModule = { pkgs, ... }: {
+      networking.hostName = "my-microvm";
+      lab.vmMacAddress = "BA:DB:EE:F0:00:00";
+
       programs.bash.interactiveShellInit = ''
         echo "Hello world from inside a virtual machine!!" | ${pkgs.lolcat}/bin/lolcat
       '';
-
-      networking.hostName = "my-microvm";
-
-      lab.vmMacAddress = "BA:DB:EE:F0:00:00";
     };
   };
 }