fix zfs latest again

nixosModules/bcachefs.nix

@@ -1,15 +1,11 @@
 {
   lib,
   pkgs,
-  config,
   ...
 }:
 {
   # If we also need zfs, we can use the unstable version as we otherwise don't have a new enough kernel version
   boot.zfs.package = pkgs.zfsUnstable;
-  boot.kernelPackages = lib.mkIf config.boot.zfs.enabled (
-    lib.mkForce config.boot.zfs.package.latestCompatibleLinuxPackages
-  );
 
   # Enable bcachefs support
   boot.supportedFilesystems.bcachefs = lib.mkDefault true;

nixosModules/installer/default.nix

@@ -47,6 +47,7 @@ in
     (modulesPath + "/profiles/installation-device.nix")
     (modulesPath + "/profiles/all-hardware.nix")
     (modulesPath + "/profiles/base.nix")
+    ./zfs-latest.nix
   ];
 
   environment.systemPackages = [ pkgs.nixos-facter ];

nixosModules/installer/zfs-latest.nix

@@ -0,0 +1,28 @@
+{
+  lib,
+  pkgs,
+  config,
+  ...
+}:
+
+let
+  isUnstable = config.boot.zfs.package == pkgs.zfsUnstable;
+  zfsCompatibleKernelPackages = lib.filterAttrs (
+    name: kernelPackages:
+    (builtins.match "linux_[0-9]+_[0-9]+" name) != null
+    && (builtins.tryEval kernelPackages).success
+    && (
+      (!isUnstable && !kernelPackages.zfs.meta.broken)
+      || (isUnstable && !kernelPackages.zfs_unstable.meta.broken)
+    )
+  ) pkgs.linuxKernel.packages;
+  latestKernelPackage = lib.last (
+    lib.sort (a: b: (lib.versionOlder a.kernel.version b.kernel.version)) (
+      builtins.attrValues zfsCompatibleKernelPackages
+    )
+  );
+in
+{
+  # Note this might jump back and worth as kernel get added or removed.
+  boot.kernelPackages = latestKernelPackage;
+}