nix: break out vm configuration into separate file

Signed-off-by: oppiliappan <[e-mail]>

flake.nix

···
       };
     });
 
-    nixosConfigurations.knotVM = nixpkgs.lib.nixosSystem {
-      system = "x86_64-linux";
-      modules = [
-        self.nixosModules.knot
-        ({
-          config,
-          pkgs,
-          ...
-        }: {
-          virtualisation.memorySize = 2048;
-          virtualisation.diskSize = 10 * 1024;
-          virtualisation.cores = 2;
-          services.getty.autologinUser = "root";
-          environment.systemPackages = with pkgs; [curl vim git];
-          systemd.tmpfiles.rules = let
-            u = config.services.tangled-knot.gitUser;
-            g = config.services.tangled-knot.gitUser;
-          in [
-            "d /var/lib/knot 0770 ${u} ${g} - -" # Create the directory first
-            "f+ /var/lib/knot/secret 0660 ${u} ${g} - KNOT_SERVER_SECRET=38a7c3237c2a585807e06a5bcfac92eb39442063f3da306b7acb15cfdc51d19d"
-          ];
-          services.tangled-knot = {
-            enable = true;
-            server = {
-              secretFile = "/var/lib/knot/secret";
-              hostname = "localhost:6000";
-              listenAddr = "0.0.0.0:6000";
-            };
-          };
-        })
-      ];
-    };
     nixosModules.appview = import ./nix/modules/appview.nix {inherit self;};
     nixosModules.knot = import ./nix/modules/knot.nix {inherit self;};
+    nixosConfigurations.knotVM = import ./nix/vm.nix {inherit self nixpkgs;};
   };
 }

nix/vm.nix

···
+{
+  nixpkgs,
+  self,
+}:
+nixpkgs.lib.nixosSystem {
+  system = "x86_64-linux";
+  modules = [
+    self.nixosModules.knot
+    ({
+      config,
+      pkgs,
+      ...
+    }: {
+      virtualisation.memorySize = 2048;
+      virtualisation.diskSize = 10 * 1024;
+      virtualisation.cores = 2;
+      services.getty.autologinUser = "root";
+      environment.systemPackages = with pkgs; [curl vim git];
+      systemd.tmpfiles.rules = let
+        u = config.services.tangled-knot.gitUser;
+        g = config.services.tangled-knot.gitUser;
+      in [
+        "d /var/lib/knot 0770 ${u} ${g} - -" # Create the directory first
+        "f+ /var/lib/knot/secret 0660 ${u} ${g} - KNOT_SERVER_SECRET=38a7c3237c2a585807e06a5bcfac92eb39442063f3da306b7acb15cfdc51d19d"
+      ];
+      services.tangled-knot = {
+        enable = true;
+        server = {
+          secretFile = "/var/lib/knot/secret";
+          hostname = "localhost:6000";
+          listenAddr = "0.0.0.0:6000";
+        };
+      };
+    })
+  ];
+}