hydra: create TUN device when starting yggdrasil

hosts/hydra/configuration.nix

@@ -10,7 +10,6 @@
     ../../lib/emery.nix
     ../../lib/buildfarmer.nix
     ../../lib/yggdrasil.nix
-    ../../lib/tun.nix
   ];
 
   c3d2 = {
@@ -20,6 +19,11 @@
   };
 
   networking.interfaces.eth0.preferTempAddress = false;
+  systemd.services.yggdrasil.preStart = ''
+    mkdir -p /dev/net
+    mknod /dev/net/tun c 10 200 || true
+    chmod 0666 /dev/net/tun
+  '';
   services.yggdrasil = {
     configFile = "/var/lib/yggdrasil/keys";
     config.Peers = [

lib/tun.nix

@@ -1,9 +0,0 @@
-# Create the TUN device file for Proxmox containters.
-
-{ ... }: {
-  boot.initrd.postDeviceCommands = ''
-    mkdir -p /dev/net
-    mknod /dev/net/tun c 10 200
-    chmod 0666 /dev/net/tun
-  '';
-}