1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87

{
  pkgs,
  lib,
  config,
  ...
}:
let
  cfg = config.services.{{ .Name }};
  pkg = pkgs.callPackage ./pkg.nix { inherit pkgs; };
in
{
  options =
    let
      inherit (lib) mkEnableOption mkOption types;
    in
    {
      services.{{ .Name }} = {
        enable = mkEnableOption "Enable {{ .Name }}";

        package = mkOption {
          type = types.package;
          description = "{{ .Name }} package to use";
          default = pkg;
        };

		{{ range $flag := .Flags -}}
		{{ .Name }} = mkOption {
		  type = types.{{ .Type }};
		  description = "{{  .Description }}";
		  {{- if .Default }}
		  default = {{ .Default }};
		  {{ end }}
		};
		{{ end }}

        user = mkOption {
          type = types.str;
          default = "{{ .Name }}";
          description = "User account under which {{ .Name }} runs";
        };

        group = mkOption {
          type = types.str;
          default = "{{ .Name }}";
          description = "Group account under which {{ .Name }} runs";
        };
    };
  config = lib.mkIf cfg.enable {
    users.users."${cfg.user}" = {
      home = "/var/lib/{{ .Name }}";
      createHome = true;
      group = "${cfg.group}";
      isSystemUser = true;
      isNormalUser = false;
      description = "user for {{ .Name }} service";
    };
    users.groups."${cfg.group}" = { };

    systemd.services = {
      {{ .Name }} = {
        enable = true;
        script =
          let
            args = [
              {{ range $flag := .Flags }}
              "--{{ .Flag }}=${cfg.{{ .Name }}}"
              {{ end }}
            ];
          in
          "${cfg.package}/bin/{{ .Name }}d ${builtins.concatStringsSep " " args}";
        wantedBy = [ "multi-user.target" ];
        after = [ "network.target" ];
        path = [
          cfg.package
        ];
        serviceConfig = {
          User = cfg.user;
          Group = cfg.group;
          Restart = "always";
          RestartSec = "15";
          WorkingDirectory = "/var/lib/{{ .Name }}";
        };
      };
    };
  };
}