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.

3 files changed, 21 insertions, 4 deletions

diff --git a/modules/services/avahi/default.nix b/modules/services/avahi/default.nix
index 8275f02..3a6eb58 100644
--- a/modules/services/avahi/default.nix
+++ b/modules/services/avahi/default.nix
@@ -4,6 +4,12 @@ in
 {
   options.my.services.avahi = with lib; {
     enable = mkEnableOption "avahi service";
+    withReflector = mkEnableOption "enable reflector";
+    interfaces = mkOption {
+      type = types.nullOr (types.listOf types.str);
+      default = null;
+      description = "List of network interfaces that should be used by the {command}`avahi-daemon`.";
+    };
   };
 
   config = lib.mkIf cfg.enable {
@@ -11,5 +17,8 @@ in
     # Important to resolve .local domains of printers, otherwise you get an error
     # like  "Impossible to connect to XXX.local: Name or service not known"
     services.avahi.nssmdns = true;
+
+    services.avahi.reflector = cfg.withReflector;
+    services.avahi.interfaces = cfg.interfaces;
   };
 }
diff --git a/modules/system/boot/default.nix b/modules/system/boot/default.nix
index cac1cec..5a5ac25 100644
--- a/modules/system/boot/default.nix
+++ b/modules/system/boot/default.nix
@@ -24,7 +24,6 @@ in
       tmpOnTmpfs = true;
 
       initrd = {
-        luks.devices."system".allowDiscards = true;
         network = lib.mkIf cfg.initrd.network.enable {
           enable = true;
           postCommands = ''
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;
+    };
 }