update various

lib/common-system.nix

@@ -1,6 +1,6 @@
 { config, lib, ... }:
 {
-  # Node Nix Config
+  # NixOS Config
   options = {
     hostName = lib.mkOption {
       type = lib.types.str;
@@ -11,6 +11,35 @@
       default = false;
       description = "Whether to enable Xen guest support";
     };
+    network = lib.mkOption {
+      type = lib.types.submodule {
+        options = {
+          interface = lib.mkOption {
+            type = lib.types.str;
+            description = "Network interface name";
+            example = "enp0s3";
+          };
+          address = lib.mkOption {
+            type = lib.types.str;
+            description = "Static IP address";
+            example = "10.0.20.200";
+          };
+          defaultGateway = lib.mkOption {
+            type = lib.types.str;
+            description = "Default gateway IP";
+            example = "10.0.20.254";
+          };
+          nameservers = lib.mkOption {
+            type = lib.types.listOf lib.types.str;
+            description = "List of DNS servers";
+            example = [ "10.0.20.254" "8.8.8.8" ];
+            default = [ "8.8.8.8" "8.8.4.4" ];
+          };
+        };
+      };
+      default = null;
+      description = "Network configuration";
+    };
   };
 
   config = lib.mkMerge [
@@ -41,12 +70,24 @@
       # User Authorized Keys
       users.users.root = {
         openssh.authorizedKeys.keys = [
-          "ssh-rsa AAAAB3NzaC1yc2EAAAABJQAAAQEA8P84lWL/p13ZBFNwITm/dLWWL8s9pVmdOImM5gaJAiTLY+DheUvG6YsveB2/5STseiJ34g7Na9TW1mtTLL8zDqPvj3NbprQiYlLJKMbCk6dtfdD4nLMHl8B48e1h699XiZDp2/c+jJb0MkLOFrps+FbPqt7pFt1Pj29tFy8BCg0LGndu6KO+HqYS+aM5tp5hZESo1RReiJ8aHsu5X7wW46brN4gfyyu+8X4etSZAB9raWqlln9NKK7G6as6X+uPypvSjYGSTC8TSePV1iTPwOxPk2+1xBsK7EBLg3jNrrYaiXLnZvBOOhm11JmHzqEJ6386FfQO+0r4iDVxmvi+ojw== rsa-key-20141114"
+          "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIIe1n9l9pVF5+kjWJCOt3AvBVf1HOSZkEDZxCWVPSIkr evan@reichard"
         ];
         hashedPassword = null;
       };
     }
 
+    # Network Configuration
+    (lib.mkIf (config.network != null) {
+      networking = {
+        inherit (config.network) defaultGateway nameservers;
+        interfaces.${config.network.interface}.ipv4.addresses = [{
+          inherit (config.network) address;
+          prefixLength = 24;
+        }];
+      };
+    })
+
+    # Xen Guest
     (lib.mkIf config.enableXenGuest {
       services.xe-guest-utilities.enable = true;