From 829bbc708bb51cf6544dcea3ce77e1a9d1793acd Mon Sep 17 00:00:00 2001
From: Graham Christensen <graham@grahamc.com>
Date: Tue, 5 Oct 2021 14:38:49 -0400
Subject: [PATCH] boot.initrd.extraFiles: allow users to add arbitrary files to
 the initrd

---
 nixos/modules/system/boot/stage-1.nix | 25 ++++++++++++++++++++++++-
 1 file changed, 24 insertions(+), 1 deletion(-)

diff --git a/nixos/modules/system/boot/stage-1.nix b/nixos/modules/system/boot/stage-1.nix
index bd7e955a6f42..be0d08936260 100644
--- a/nixos/modules/system/boot/stage-1.nix
+++ b/nixos/modules/system/boot/stage-1.nix
@@ -338,7 +338,14 @@ let
         { object = pkgs.kmod-debian-aliases;
           symlink = "/etc/modprobe.d/debian.conf";
         }
-      ];
+      ] ++ (lib.mapAttrsToList
+        (symlink: options:
+          {
+            inherit symlink;
+            object = options.source;
+          }
+        )
+        config.boot.initrd.extraFiles);
   };
 
   # Script to add secret files to the initrd at bootloader update time
@@ -419,6 +426,22 @@ in
       '';
     };
 
+    boot.initrd.extraFiles = mkOption {
+      default = { };
+      type = types.attrsOf
+        (types.submodule {
+          options = {
+            source = mkOption {
+              type = types.package;
+              description = "The object to make available inside the initrd.";
+            };
+          };
+        });
+      description = ''
+        Extra files to link and copy in to the initrd.
+      '';
+    };
+
     boot.initrd.prepend = mkOption {
       default = [ ];
       type = types.listOf types.str;