set hostName and domain in nixos config directly

nixos/machines/default.nix

@@ -1,35 +1,44 @@
 {
   jefke = {
-    # TODO: directly set and read this from nixos config.
-    hostName = "jefke";
-    domain = "hyp";
+    # TODO: model this in a nixos module?
     type = "physical";
 
-    nixosModule.lab = {
-      terraformDatabase.enable = true;
-
-      storage = {
-        osDisk = "/dev/sda";
-        dataPartition = "/dev/nvme0n1p1";
+    nixosModule = {
+      networking = {
+        hostName = "jefke";
+        # TODO: generate this using type?
+        domain = "hyp";
       };
 
-      ssh = {
-        useCertificates = true;
-        # TODO: automatically set this?
-        hostCert = builtins.readFile ./jefke_host_ed25519-cert.pub;
-        userCert = builtins.readFile ./jefke_user_ed25519-cert.pub;
+      lab = {
+        terraformDatabase.enable = true;
+
+        storage = {
+          osDisk = "/dev/sda";
+          dataPartition = "/dev/nvme0n1p1";
+        };
+
+        ssh = {
+          useCertificates = true;
+          # TODO: automatically set this?
+          hostCert = builtins.readFile ./jefke_host_ed25519-cert.pub;
+          userCert = builtins.readFile ./jefke_user_ed25519-cert.pub;
+        };
       };
     };
   };
 
   atlas = {
-    hostName = "atlas";
-    domain = "hyp";
     type = "physical";
 
     nixosModule = { config, ... }:
       let inherit (config.lab.networking) dmzServicesIPv4 dmzServicesIPv6; in
       {
+        networking = {
+          hostName = "atlas";
+          domain = "hyp";
+        };
+
         lab = {
           networking = {
             # TODO: Ideally, we don't have to set this here.
@@ -53,11 +62,14 @@
   };
 
   lewis = {
-    hostName = "lewis";
-    domain = "hyp";
     type = "physical";
 
     nixosModule = { pkgs, ... }: {
+      networking = {
+        hostName = "lewis";
+        domain = "hyp";
+      };
+
       lab = {
         dataHost.enable = true;
 
@@ -76,8 +88,6 @@
   };
 
   my-microvm = {
-    hostName = "my-microvm";
-    domain = "dmz";
     type = "virtual";
     hypervisorName = "lewis";
 
@@ -86,6 +96,11 @@
         echo "Hello world from inside a virtual machine!!" | ${pkgs.lolcat}/bin/lolcat
       '';
 
+      networking = {
+        hostName = "my-microvm";
+        domain = "dmz";
+      };
+
       lab.vmMacAddress = "BA:DB:EE:F0:00:00";
     };
   };

nixos/modules/networking/default.nix

@@ -89,8 +89,6 @@ in {
 
   config = {
     networking = {
-      hostName = machine.hostName;
-      domain = machine.domain;
       nftables.enable = true;
       useDHCP = machine.type == "virtual";
 

nixos/physical.nix

@@ -58,23 +58,20 @@
 
     microvm.vms =
       let
-        vmsForHypervisor = lib.attrValues (lib.filterAttrs (n: v: v.type == "virtual" && v.hypervisorName == machine.hostName) machines);
+        vmsForHypervisor = lib.filterAttrs (n: v: v.type == "virtual" && v.hypervisorName == config.networking.hostName) machines;
       in
-      lib.attrsets.mergeAttrsList (map
-        (vm:
+      builtins.mapAttrs
+        (name: vm:
           {
-            "${vm.hostName}" = {
-              # TODO Simplify?
-              specialArgs = { inherit agenix disko pkgs lib microvm; machine = vm; hypervisorConfig = config; };
-              config = {
-                imports = [
-                  ./.
-                ];
-              };
+            # TODO Simplify?
+            specialArgs = { inherit agenix disko pkgs lib microvm; machine = vm; hypervisorConfig = config; };
+            config = {
+              imports = [
+                ./.
+              ];
             };
           }
         )
-        vmsForHypervisor
-      );
+        vmsForHypervisor;
   };
 }

nixos/virtual.nix

@@ -1,4 +1,4 @@
-{ lib, config, machine, hypervisorConfig, ... }: {
+{ lib, config, hypervisorConfig, ... }: {
   options.lab.vmMacAddress = lib.mkOption {
     type = lib.types.str;
     description = ''
@@ -19,7 +19,7 @@
 
       interfaces = [{
         type = "tap";
-        id = "vm-${machine.hostName}";
+        id = "vm-${config.networking.hostName}";
         mac = config.lab.vmMacAddress;
       }];
     };