nixos/incus: add openvswitch support

1. Added openvswitch integration to incus service.
2. Added tests to test openvswitch functionality with incus.

nixos/modules/virtualisation/incus.nix

@@ -164,19 +164,24 @@ in
         "network-online.target"
         "lxcfs.service"
         "incus.socket"
-      ];
+      ]
+        ++ lib.optional config.virtualisation.vswitch.enable "ovs-vswitchd.service";
+
       requires = [
         "lxcfs.service"
         "incus.socket"
-      ];
+      ]
+        ++ lib.optional config.virtualisation.vswitch.enable "ovs-vswitchd.service";
+
       wants = [
         "network-online.target"
       ];
 
-      path = lib.mkIf config.boot.zfs.enabled [
+      path = lib.optional config.boot.zfs.enabled [
         config.boot.zfs.package
         "${config.boot.zfs.package}/lib/udev"
-      ];
+      ]
+        ++ lib.optional config.virtualisation.vswitch.enable config.virtualisation.vswitch.package;
 
       environment = lib.mkMerge [ {
         # Override Path to the LXC template configuration directory

nixos/tests/incus/default.nix

@@ -11,6 +11,7 @@
     boot.initrd.systemd.enable = true;
   }; };
   lxd-to-incus = import ./lxd-to-incus.nix { inherit system pkgs; };
+  openvswitch = import ./openvswitch.nix { inherit system pkgs; };
   preseed = import ./preseed.nix { inherit system pkgs; };
   socket-activated = import ./socket-activated.nix { inherit system pkgs; };
   ui = import ./ui.nix {inherit system pkgs;};

nixos/tests/incus/openvswitch.nix

@@ -0,0 +1,65 @@
+import ../make-test-python.nix ({ pkgs, lib, ... } :
+
+{
+  name = "incus-openvswitch";
+
+  meta = {
+    maintainers = lib.teams.lxc.members;
+  };
+
+  nodes.machine = { lib, ... }: {
+    virtualisation = {
+      incus.enable = true;
+      vswitch.enable = true;
+      incus.preseed = {
+        networks = [
+          {
+            name = "nixostestbr0";
+            type = "bridge";
+            config = {
+              "bridge.driver" = "openvswitch";
+              "ipv4.address" = "10.0.100.1/24";
+              "ipv4.nat" = "true";
+            };
+          }
+        ];
+        profiles = [
+          {
+            name = "nixostest_default";
+            devices = {
+              eth0 = {
+                name = "eth0";
+                network = "nixostestbr0";
+                type = "nic";
+              };
+              root = {
+                path = "/";
+                pool = "default";
+                size = "35GiB";
+                type = "disk";
+              };
+            };
+          }
+        ];
+        storage_pools = [
+          {
+            name = "nixostest_pool";
+            driver = "dir";
+          }
+        ];
+      };
+    };
+    networking.nftables.enable = true;
+  };
+
+  testScript = ''
+    machine.wait_for_unit("incus.service")
+    machine.wait_for_unit("incus-preseed.service")
+
+    with subtest("Verify openvswitch bridge"):
+      machine.succeed("incus network info nixostestbr0")
+
+    with subtest("Verify openvswitch bridge"):
+      machine.succeed("ovs-vsctl br-exists nixostestbr0")
+  '';
+})