{ config, options, pkgs, lib, ... }:

# https://wiki.nixos.org/wiki/NFS

# TODO: use tailscale if enabled
# TODO: wireguard/tailscale
# TODO: nfsv4 and idmapping
#boot.kernelParams = [ "nfs.nfs4_disable_idmapping=0" "nfsd.nfs4_disable_idmapping=0" ];

let
  cfg = config.pbsds.nfs-lazy-mount;
in
{

  options.pbsds.nfs-lazy-mount.enable = lib.mkEnableOption "nfs-lazy-mount";
  options.pbsds.nfs-lazy-mount.nfsOptions = lib.mkOption {
    type = with lib.types; listOf str;
    default = [];
    internal = true;
  };

  # same default as `fileSystems.<name>.options`
  # https://search.nixos.org/options?channel=unstable&query=fileSystems.%3Cname%3E.options
  # https://man.archlinux.org/man/core/util-linux/mount.8.en
  config.pbsds.nfs-lazy-mount.nfsOptions = lib.mkMerge [

    # nixos default
    [ "defaults" ]

    (lib.mkIf cfg.enable [
      # lazy mount
      "x-systemd.automount"
      "noauto"
      # disconnect after 10 minutes
      "x-systemd.idle-timeout=600"
    ])

  ];

}