allow configuring whether a node uses QEMU

infra/common/nixos/networking.nix

@@ -1,7 +1,7 @@
 { config, lib, ... }:
 
 let
-  inherit (lib) mkDefault mkIf mkMerge;
+  inherit (lib) mkDefault;
 
 in
 {
@@ -13,49 +13,53 @@ in
       settings.PasswordAuthentication = false;
     };
 
-    networking = mkMerge [
+    networking = {
-      {
+      hostName = config.fediversityVm.name;
-        hostName = config.fediversityVm.name;
+      domain = config.fediversityVm.domain;
-        domain = config.fediversityVm.domain;
 
-        ## REVIEW: Do we actually need that, considering that we have static IPs?
+      ## REVIEW: Do we actually need that, considering that we have static IPs?
-        useDHCP = mkDefault true;
+      useDHCP = mkDefault true;
 
-        nameservers = [
+      interfaces = {
-          "95.215.185.6"
+        eth0 = {
-          "95.215.185.7"
+          ipv4 = {
-          "2a00:51c0::5fd7:b906"
+            addresses = [
-          "2a00:51c0::5fd7:b907"
+              {
-        ];
+                inherit (config.fediversityVm.ipv4) address prefixLength;
-
+              }
-        firewall.enable = false;
+            ];
-        nftables = {
+          };
-          enable = true;
+          ipv6 = {
-          rulesetFile = ./nftables-ruleset.nft;
+            addresses = [
+              {
+                inherit (config.fediversityVm.ipv6) address prefixLength;
+              }
+            ];
+          };
         };
-      }
+      };
 
-      ## IPv4
+      defaultGateway = {
-      (mkIf config.fediversityVm.ipv4.enable {
+        address = config.fediversityVm.ipv4.gateway;
-        interfaces.${config.fediversityVm.ipv4.interface}.ipv4.addresses = [
+        interface = "eth0";
-          { inherit (config.fediversityVm.ipv4) address prefixLength; }
+      };
-        ];
+      defaultGateway6 = {
-        defaultGateway = {
+        address = config.fediversityVm.ipv6.gateway;
-          address = config.fediversityVm.ipv4.gateway;
+        interface = "eth0";
-          interface = config.fediversityVm.ipv4.interface;
+      };
-        };
-      })
 
-      ## IPv6
+      nameservers = [
-      (mkIf config.fediversityVm.ipv6.enable {
+        "95.215.185.6"
-        interfaces.${config.fediversityVm.ipv6.interface}.ipv6.addresses = [
+        "95.215.185.7"
-          { inherit (config.fediversityVm.ipv6) address prefixLength; }
+        "2a00:51c0::5fd7:b906"
-        ];
+        "2a00:51c0::5fd7:b907"
-        defaultGateway6 = {
+      ];
-          address = config.fediversityVm.ipv6.gateway;
+
-          interface = config.fediversityVm.ipv6.interface;
+      firewall.enable = false;
-        };
+      nftables = {
-      })
+        enable = true;
-    ];
+        rulesetFile = ./nftables-ruleset.nft;
+      };
+    };
   };
 }

infra/common/options.nix

@@ -91,17 +91,6 @@ in
     };
 
     ipv4 = {
-      enable = mkOption {
-        default = true;
-      };
-
-      interface = mkOption {
-        description = ''
-          The interface that carries the machine's IPv4 network.
-        '';
-        default = "eth0";
-      };
-
       address = mkOption {
         description = ''
           The IP address of the machine, version 4. It will be injected as a
@@ -127,17 +116,6 @@ in
     };
 
     ipv6 = {
-      enable = mkOption {
-        default = true;
-      };
-
-      interface = mkOption {
-        description = ''
-          The interface that carries the machine's IPv6 network.
-        '';
-        default = "eth0";
-      };
-
       address = mkOption {
         description = ''
           The IP address of the machine, version 6. It will be injected as a