From bfdfc7ee68e4dd951e138538ecf3a1490c18ac1a Mon Sep 17 00:00:00 2001
From: clerie <git@clerie.de>
Date: Wed, 7 Feb 2024 18:42:30 +0100
Subject: [PATCH] hosts/zinc: custom network setup in initrd

---
 hosts/zinc/initrd.nix | 45 ++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 42 insertions(+), 3 deletions(-)

diff --git a/hosts/zinc/initrd.nix b/hosts/zinc/initrd.nix
index fa69543..bd00129 100644
--- a/hosts/zinc/initrd.nix
+++ b/hosts/zinc/initrd.nix
@@ -1,6 +1,31 @@
-{ config, ... }:
+{ config, pkgs, lib, ... }:
 
-{
+with lib;
+
+let
+
+  configure_network = pkgs.writeScriptBin "configure-network" ''
+    ifdisplay=""
+    while true; do
+      ifdisplay_new=$(ipconfig -t 10 all)
+      ipconfig_status=$?
+
+      # Only show network config if something changes
+      if [[ "$ifdisplay" != "$ifdisplay_new" ]]; then
+        ifdisplay=$ifdisplay_new
+        echo
+        echo "$ifdisplay"
+        echo
+      fi
+
+      # Wait a little before checking again
+      if [[ $ipconfig_status == 0 ]]; then
+        sleep 5
+      fi
+    done
+  '';
+
+in {
 
   boot.initrd.network.enable = true;
   boot.initrd.network.ssh = {
@@ -16,7 +41,21 @@
     "igc" # integrated rj45 network interface
     "cdc_ether" # external 5G modem via usb
   ];
-  boot.kernelParams = [ "ip=dhcp" ];
+
+  boot.initrd.extraUtilsCommands = ''
+    copy_bin_and_libs ${configure_network}/bin/configure-network
+  '';
+
+  boot.initrd.network.postCommands = mkBefore ''
+    configure-network &
+  '';
+
+  boot.initrd.postMountCommands = mkBefore ''
+    pkill -x configure-network
+
+    # Override the previously set interfaces with the ones that really exist
+    ifaces=$(ip -o link show | grep "link/ether" | cut -d: -f2 | xargs -n 1)
+  '';
 
   boot.initrd.network.wireguard = {
     enable = true;