Add support for zfs

modules/nix-unstable.nix

@@ -0,0 +1,13 @@
+{ config, lib, pkgs, ... }: {
+
+  nixpkgs.config.allowUnfree = true;
+  nix = {
+    allowedUsers = [ "@wheel" ];
+    trustedUsers = [ "root" "@wheel" ];
+    package = pkgs.nixUnstable;
+    extraOptions = ''
+      experimental-features = nix-command flakes
+    '';
+  };
+
+}

modules/uefi-zfs.nix

@@ -0,0 +1,22 @@
+{ config, lib, pkgs, inputs, ... }: {
+
+  # UEFI boot
+  boot.loader = {
+    efi.canTouchEfiVariables = true;
+    systemd-boot = {
+      enable = true;
+      editor = false;
+    };
+    timeout = lib.mkDefault 1;
+  };
+  boot.tmpOnTmpfs = true;
+
+  # Add ZFS support.
+  boot.supportedFilesystems = [ "zfs" ];
+  boot.zfs.requestEncryptionCredentials = true;
+
+  # ZFS services
+  services.zfs.autoSnapshot.enable = true;
+  services.zfs.autoScrub.enable = true;
+
+}