add nfs and autofs system

modules/autofs.nix

@@ -0,0 +1,44 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+  cfg = config.services.autofs-custom;
+in
+
+{
+  options.services.autofs-custom = {
+    enable = mkEnableOption "AutoFS automatic mounting";
+
+    remoteHost = mkOption {
+      type = types.str;
+      description = "Remote NFS server hostname or IP";
+    };
+
+    remotePath = mkOption {
+      type = types.str;
+      description = "Remote path to mount";
+    };
+
+    mountPoint = mkOption {
+      type = types.str;
+      description = "Local mount point";
+    };
+  };
+
+  config = mkIf cfg.enable {
+    services.autofs = {
+      enable = true;
+      timeout = 300;
+      autoMaster = ''
+        ${cfg.mountPoint} -fstype=nfs4,rw,soft,intr,noatime ${cfg.remoteHost}:${cfg.remotePath}
+      '';
+    };
+
+    systemd.tmpfiles.rules = [
+      "d ${cfg.mountPoint} 0755 root root -"
+    ];
+
+    environment.systemPackages = [ pkgs.nfs-utils ];
+  };
+}