begin migration to dendritic pattern

old-config/hosts/takamaki/modules/virt-manager.nix

@@ -0,0 +1,20 @@
+{
+  pkgs,
+  config,
+  ...
+}: {
+  virtualisation.libvirtd = {
+    enable = true;
+    qemu.vhostUserPackages = with pkgs; [ virtiofsd ];
+  };
+
+  programs.virt-manager.enable = true;
+
+  users.users.grey.extraGroups = [ "libvirtd" ];
+
+  environment.systemPackages = with pkgs; [
+    dnsmasq
+  ];
+
+  networking.firewall.trustedInterfaces = [ "virbr0" ];
+}