nixpkgs/modules/services/networking/portmap.nix

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{ config, pkgs, ... }:
with pkgs.lib;
let
uid = config.ids.uids.portmap;
gid = config.ids.gids.portmap;
portmap = pkgs.portmap.override { daemonUID = uid; daemonGID = gid; };
in
{
###### interface
options = {
services.portmap = {
enable = mkOption {
default = false;
description = ''
Whether to enable `portmap', an ONC RPC directory service
notably used by NFS and NIS, and which can be queried
using the rpcinfo(1) command.
'';
};
verbose = mkOption {
default = false;
description = ''
Whether to enable verbose output.
'';
};
chroot = mkOption {
default = "/var/empty";
description = ''
If non-empty, a path to change root to.
'';
};
};
};
###### implementation
config = mkIf config.services.portmap.enable {
users.extraUsers = singleton
{ name = "portmap";
inherit uid;
description = "portmap daemon user";
home = "/var/empty";
};
users.extraGroups = singleton
{ name = "portmap";
inherit gid;
};
jobAttrs.portmap =
{ description = "ONC RPC portmap";
startOn = "network-interfaces/started";
stopOn = "network-interfaces/stop";
exec =
''
${portmap}/sbin/portmap -f \
${if config.services.portmap.chroot == ""
then ""
else "-t \"${config.services.portmap.chroot}\""} \
${if config.services.portmap.verbose then "-v" else ""}
'';
};
};
}