added an nfsv2 module.

hosts/workstation-vm/default.nix

@@ -19,10 +19,12 @@ inputs.nixpkgs.lib.nixosSystem {
     ../../modules/nixos/printing.nix
     ../../modules/both/sound.nix
     ../../modules/nixos/networking.nix
+    ../../modules/nixos/nfsv2.nix
     ../../modules/both/i3
     ({
       config,
       pkgs,
+      lib,
       ...
     }: {
       host = {
@@ -85,6 +87,11 @@ inputs.nixpkgs.lib.nixosSystem {
       # Enable the OpenSSH daemon.
       services.openssh.enable = true;
 
+      services.nfs.server = {
+        enable = true;
+        exports = "/srv/nfs *(rw,sync,no_root_squash,no_subtree_check)";
+      };
+
       # Bootloader.
       boot.loader.systemd-boot.enable = true;
       boot.loader.efi.canTouchEfiVariables = true;

modules/nixos/nfsv2.nix

@@ -0,0 +1,23 @@
+{
+  config,
+  pkgs,
+  lib,
+  ...
+}: {
+  # will force you to compile kernel locally.
+  services.nfs = {
+    settings = {
+      nfsd.vers2 = true;
+    };
+    server.enable = true;
+  };
+  boot.kernelPatches = [
+    {
+      name = "nfsv2";
+      patch = null;
+      extraStructuredConfig = {
+        NFSD_V2 = lib.kernel.yes;
+      };
+    }
+  ];
+}