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 {
environment.systemPackages = [ portmap ];
users.extraUsers = singleton
{ name = "portmap";
inherit uid;
description = "Portmap daemon user";
home = "/var/empty";
};
users.extraGroups = singleton
{ name = "portmap";
inherit gid;
};
jobs.portmap =
{ description = "ONC RPC portmap";
startOn = "started network-interfaces";
stopOn = ""; # needed during shutdown
daemonType = "fork";
path = [ portmap pkgs.netcat ];
exec =
''
portmap \
${optionalString (config.services.portmap.chroot != "")
"-t '${config.services.portmap.chroot}'"} \
${if config.services.portmap.verbose then "-v" else ""}
'';
postStart =
''
# Portmap forks into the background before it starts
# listening, so wait until its ready.
while ! nc -z localhost 111; do
if [[ "$(status)" =~ stop/ ]]; then exit; fi
sleep 1
done
'';
};
};
}