nixos/stage-1: Add option for allowing missing modules

Author: ElvishJerricco

nixos/modules/system/boot/kernel.nix

@@ -223,6 +223,11 @@ in
       '';
     };
 
+    boot.initrd.allowMissingModules = mkEnableOption ''  
+      not including modules from `kernelModules` /
+      `availableKernelModules` in initrd when the kernel doesn't have
+      them'';
+
     system.modulesTree = mkOption {
       type = types.listOf types.path;
       internal = true;

nixos/modules/system/boot/stage-1.nix

@@ -18,7 +18,7 @@ let
     rootModules = config.boot.initrd.availableKernelModules ++ config.boot.initrd.kernelModules;
     kernel = config.system.modulesTree;
     firmware = config.hardware.firmware;
-    allowMissing = false;
+    allowMissing = config.boot.initrd.allowMissingModules;
   };
 
 

nixos/modules/system/boot/systemd/initrd.nix

@@ -104,7 +104,7 @@ let
     rootModules = config.boot.initrd.availableKernelModules ++ config.boot.initrd.kernelModules;
     kernel = config.system.modulesTree;
     firmware = config.hardware.firmware;
-    allowMissing = false;
+    allowMissing = config.boot.initrd.allowMissingModules;
   };
 
   initrdBinEnv = pkgs.buildEnv {