hosts/carmel: reconfigure the host as a router

I'm not using it as a desktop, and the current router is getting old and
will likely fail in the near future. It's also a debian machine
configured manually, so let's reconfigure carmel as our new router.

There are three NICs in the host: 2 are 10Gb and one is 1Gb. The 1Gb
will be used as the upstream interface, and one of the 10Gb will be for
the LAN.

There are 2 VLANs to configure: one for IoT devices and one for guest.

1 files changed, 12 insertions, 3 deletions

diff --git a/modules/system/btrfs/default.nix b/modules/system/btrfs/default.nix
index d569c78..3446b2c 100644
--- a/modules/system/btrfs/default.nix
+++ b/modules/system/btrfs/default.nix
@@ -1,5 +1,14 @@
-{ ... }:
-
+{ lib, config, ... }:
+let
+  cfg = config.my.systems.btrfs;
+in
 {
-  services.btrfs.autoScrub.enable = true;
+  options.my.systems.btrfs = with lib; {
+    enable = mkEnableOption "btrfs configuration";
+  };
+
+  config = lib.mkIf cfg.enable
+    {
+      services.btrfs.autoScrub.enable = !config.virtualisation.libvirtd.enable;
+    };
 }