Merge pull request #516 from nix-community/zfs

add latest zfs-kernel mixin

dev/test-configurations.nix

@@ -150,6 +150,12 @@ in
       self.nixosModules.mixins-nginx
     ];
   };
+  examples-mixin-latest-zfs-kernel = nixosSystem {
+    modules = [
+      dummy
+      self.nixosModules.mixins-latest-zfs-kernel
+    ];
+  };
 
   # Roles
   example-roles-github-actions-runner = nixosSystem {

nixos/default.nix

@@ -10,19 +10,20 @@ exposeModules ./. [
   ./hardware/hetzner-cloud/arm.nix
   ./hardware/hetzner-online/amd.nix
   ./hardware/hetzner-online/arm.nix
-  ./hardware/hetzner-online/intel.nix
   ./hardware/hetzner-online/ex101.nix
+  ./hardware/hetzner-online/intel.nix
   ./hardware/vultr/bare-metal.nix
   ./hardware/vultr/vm.nix
   ./mixins/cloud-init.nix
+  ./mixins/latest-zfs-kernel.nix
+  ./mixins/mdns.nix
   ./mixins/nginx.nix
+  ./mixins/nix-experimental.nix
   ./mixins/systemd-boot.nix
   ./mixins/telegraf.nix
   ./mixins/terminfo.nix
   ./mixins/tracing.nix
   ./mixins/trusted-nix-caches.nix
-  ./mixins/nix-experimental.nix
-  ./mixins/mdns.nix
   ./roles/github-actions-runner.nix
   ./roles/nix-remote-builder.nix
   ./roles/prometheus

nixos/mixins/latest-zfs-kernel.nix

@@ -0,0 +1,19 @@
+{ lib, pkgs, ... }:
+let
+  latestZfsCompatibleLinuxPackages = lib.pipe pkgs.linuxKernel.packages [
+    builtins.attrValues
+    (builtins.filter (
+      kPkgs:
+      (builtins.tryEval kPkgs).success
+      && kPkgs ? kernel
+      && kPkgs.kernel.pname == "linux"
+      && !kPkgs.zfs.meta.broken
+    ))
+    (builtins.sort (a: b: (lib.versionOlder a.kernel.version b.kernel.version)))
+    lib.last
+  ];
+in
+{
+  # Note this might jump back and worth as kernel get added or removed.
+  boot.kernelPackages = latestZfsCompatibleLinuxPackages;
+}