initrd: Include filesystem support for /nix, /var etc.

1 files changed, 11 insertions, 0 deletions

diff --git a/nixos/modules/system/boot/stage-1.nix b/nixos/modules/system/boot/stage-1.nix
index b6249b6c091..01558b8f9b2 100644
--- a/nixos/modules/system/boot/stage-1.nix
+++ b/nixos/modules/system/boot/stage-1.nix
@@ -313,6 +313,13 @@ in
       example = "xz";
     };
 
+    boot.initrd.supportedFilesystems = mkOption {
+      default = [ ];
+      example = [ "btrfs" ];
+      type = types.listOf types.string;
+      description = "Names of supported filesystem types in the initial ramdisk.";
+    };
+
     fileSystems = mkOption {
       options.neededForBoot = mkOption {
         default = false;
@@ -347,5 +354,9 @@ in
     # Prevent systemd from waiting for the /dev/root symlink.
     systemd.units."dev-root.device".text = "";
 
+    boot.initrd.supportedFilesystems =
+      map (fs: fs.fsType)
+        (filter (fs: fs.mountPoint == "/" || fs.neededForBoot) fileSystems);
+
   };
 }