nix/vm: add nixos-containers and networking

nix/vm.nix

@@ -1,22 +1,28 @@
 { self, nixpkgs, ... }:
-nixpkgs.lib.nixosSystem {
+let
   system = "x86_64-linux";
   pkgs = import nixpkgs {
-    system = "x86_64-linux";
+    inherit system;
     overlays = [
-      self.overlays.roowho2
+      self.overlays.default
     ];
   };
+in
+nixpkgs.lib.nixosSystem {
+  inherit system pkgs;
   modules = [
     "${nixpkgs}/nixos/modules/virtualisation/qemu-vm.nix"
     "${nixpkgs}/nixos/tests/common/user-account.nix"
 
     self.nixosModules.default
 
-    ({ config, pkgs, ... }: {
+    ({ config, lib, ... }: {
       system.stateVersion = config.system.nixos.release;
       virtualisation.graphics = false;
 
+      virtualisation.memorySize = 256;
+      virtualisation.vlans = [ 1 ];
+
       users.users.alice.extraGroups = [ "wheel" ];
 
       services.getty.autologinUser = "alice";
@@ -27,6 +33,11 @@ nixpkgs.lib.nixosSystem {
 
         Try running any of:
             rwho
+            ruptime
+
+        To log into other containers, use:
+            machinectl shell c1
+            machinectl shell c2
 
         Password for alice is 'foobar'
 
@@ -43,7 +54,83 @@ nixpkgs.lib.nixosSystem {
         defaultEditor = true;
       };
 
-      environment.systemPackages = with pkgs; [ jq roowho2 ];
+      security.polkit.enable = true;
+
+      networking = {
+        useNetworkd = true;
+        macvlans.mv-eth0-host = {
+          interface = "eth0";
+          mode = "bridge";
+        };
+      };
+
+      systemd.network.enable = true;
+      systemd.network.networks."mv-eth0-host" = {
+        matchConfig.Name = "mv-eth0-host";
+        gateway = [
+          "10.0.0.255"
+        ];
+        DHCP = "no";
+        address =  [
+          "10.0.0.128/24"
+        ];
+      };
+
+      containers = let
+        commonContainerConfig = n: {
+          autoStart = true;
+          macvlans = [ "eth0" ];
+          config = {
+            imports = [
+              "${nixpkgs}/nixos/tests/common/user-account.nix"
+              self.nixosModules.default
+            ];
+            system.stateVersion = config.system.nixos.release;
+            nixpkgs.pkgs = pkgs;
+
+            networking = {
+              hostName = "c${toString n}";
+              useDHCP = false;
+              useNetworkd = true;
+              useHostResolvConf = false;
+            };
+
+            systemd.network.enable = true;
+            systemd.network.networks."mv-eth0" = {
+              matchConfig.Name = "mv-eth0";
+              gateway = [ "10.0.0.255" ];
+              address = [ "10.0.0.${toString n}/24" ];
+              dhcpV4Config.ClientIdentifier = "mac";
+            };
+
+            users.users.alice.extraGroups = [ "wheel" ];
+
+            users.motd = ''
+              =================================
+              Welcome to the roowho2 c${toString n} container!
+
+              Try running any of:
+                  rwho
+                  ruptime
+
+              Password for alice is 'foobar'
+              =================================
+            '';
+
+            services.roowho2 = {
+              enable = true;
+            };
+
+            programs.vim = {
+              enable = true;
+              defaultEditor = true;
+            };
+          };
+        };
+      in {
+        c1 = commonContainerConfig 1;
+        c2 = commonContainerConfig 2;
+      };
     })
   ];
 }