From 7e7510de4ac5892157145d68582137425b894382 Mon Sep 17 00:00:00 2001
From: Michael Hoang <enzime@users.noreply.github.com>
Date: Sun, 12 Dec 2021 13:34:55 +1100
Subject: [PATCH] netboot: Support cmdline variable from netboot.xyz

---
 nixos/modules/installer/netboot/netboot.nix | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/nixos/modules/installer/netboot/netboot.nix b/nixos/modules/installer/netboot/netboot.nix
index 145f71b5d0c7..a459e7304cd4 100644
--- a/nixos/modules/installer/netboot/netboot.nix
+++ b/nixos/modules/installer/netboot/netboot.nix
@@ -94,7 +94,9 @@ with lib;
 
     system.build.netbootIpxeScript = pkgs.writeTextDir "netboot.ipxe" ''
       #!ipxe
-      kernel ${pkgs.stdenv.hostPlatform.linux-kernel.target} init=${config.system.build.toplevel}/init initrd=initrd ${toString config.boot.kernelParams}
+      # Use the cmdline variable to allow the user to specify custom kernel params
+      # when chainloading this script from other iPXE scripts like netboot.xyz
+      kernel ${pkgs.stdenv.hostPlatform.linux-kernel.target} init=${config.system.build.toplevel}/init initrd=initrd ${toString config.boot.kernelParams} ''${cmdline}
       initrd initrd
       boot
     '';