pyrox.dev
1{
2 config,
3 lib,
4 pkgs,
5 ...
6}:
7let
8 cfg = config.services.epmd;
9in
10{
11 ###### interface
12 options.services.epmd = {
13 enable = lib.mkOption {
14 type = lib.types.bool;
15 default = false;
16 description = ''
17 Whether to enable socket activation for Erlang Port Mapper Daemon (epmd),
18 which acts as a name server on all hosts involved in distributed
19 Erlang computations.
20 '';
21 };
22 package = lib.mkPackageOption pkgs "erlang" { };
23 listenStream = lib.mkOption {
24 type = lib.types.str;
25 default = "[::]:4369";
26 description = ''
27 the listenStream used by the systemd socket.
28 see <https://www.freedesktop.org/software/systemd/man/systemd.socket.html#ListenStream=> for more information.
29 use this to change the port epmd will run on.
30 if not defined, epmd will use "[::]:4369"
31 '';
32 };
33 };
34
35 ###### implementation
36 config = lib.mkIf cfg.enable {
37 assertions = [
38 {
39 assertion = cfg.listenStream == "[::]:4369" -> config.networking.enableIPv6;
40 message = "epmd listens by default on ipv6, enable ipv6 or change config.services.epmd.listenStream";
41 }
42 ];
43 systemd.sockets.epmd = rec {
44 description = "Erlang Port Mapper Daemon Activation Socket";
45 wantedBy = [ "sockets.target" ];
46 before = wantedBy;
47 socketConfig = {
48 ListenStream = cfg.listenStream;
49 Accept = "false";
50 };
51 };
52
53 systemd.services.epmd = {
54 description = "Erlang Port Mapper Daemon";
55 after = [ "network.target" ];
56 requires = [ "epmd.socket" ];
57
58 serviceConfig = {
59 DynamicUser = true;
60 ExecStart = "${cfg.package}/bin/epmd -systemd";
61 Type = "notify";
62 };
63 };
64 };
65
66 meta.maintainers = lib.teams.beam.members;
67}