pyrox.dev
1{ config, lib, pkgs, ... }:
2
3with lib;
4
5let
6 cfg = config.services.epmd;
7in
8{
9 ###### interface
10 options.services.epmd = {
11 enable = mkOption {
12 type = types.bool;
13 default = false;
14 description = ''
15 Whether to enable socket activation for Erlang Port Mapper Daemon (epmd),
16 which acts as a name server on all hosts involved in distributed
17 Erlang computations.
18 '';
19 };
20 package = mkPackageOption pkgs "erlang" { };
21 listenStream = mkOption
22 {
23 type = types.str;
24 default = "[::]:4369";
25 description = ''
26 the listenStream used by the systemd socket.
27 see https://www.freedesktop.org/software/systemd/man/systemd.socket.html#ListenStream= for more information.
28 use this to change the port epmd will run on.
29 if not defined, epmd will use "[::]:4369"
30 '';
31 };
32 };
33
34 ###### implementation
35 config = mkIf cfg.enable {
36 assertions = [{
37 assertion = cfg.listenStream == "[::]:4369" -> config.networking.enableIPv6;
38 message = "epmd listens by default on ipv6, enable ipv6 or change config.services.epmd.listenStream";
39 }];
40 systemd.sockets.epmd = rec {
41 description = "Erlang Port Mapper Daemon Activation Socket";
42 wantedBy = [ "sockets.target" ];
43 before = wantedBy;
44 socketConfig = {
45 ListenStream = cfg.listenStream;
46 Accept = "false";
47 };
48 };
49
50 systemd.services.epmd = {
51 description = "Erlang Port Mapper Daemon";
52 after = [ "network.target" ];
53 requires = [ "epmd.socket" ];
54
55 serviceConfig = {
56 DynamicUser = true;
57 ExecStart = "${cfg.package}/bin/epmd -systemd";
58 Type = "notify";
59 };
60 };
61 };
62
63 meta.maintainers = teams.beam.members;
64}