pyrox.dev
1{ config, lib, pkgs, ... }:
2
3let
4 inherit (lib) mkIf mkOption singleton types;
5 inherit (pkgs) coreutils exim;
6 cfg = config.services.exim;
7in
8
9{
10
11 ###### interface
12
13 options = {
14
15 services.exim = {
16
17 enable = mkOption {
18 type = types.bool;
19 default = false;
20 description = "Whether to enable the Exim mail transfer agent.";
21 };
22
23 config = mkOption {
24 type = types.string;
25 default = "";
26 description = ''
27 Verbatim Exim configuration. This should not contain exim_user,
28 exim_group, exim_path, or spool_directory.
29 '';
30 };
31
32 user = mkOption {
33 type = types.string;
34 default = "exim";
35 description = ''
36 User to use when no root privileges are required.
37 In particular, this applies when receiving messages and when doing
38 remote deliveries. (Local deliveries run as various non-root users,
39 typically as the owner of a local mailbox.) Specifying this value
40 as root is not supported.
41 '';
42 };
43
44 group = mkOption {
45 type = types.string;
46 default = "exim";
47 description = ''
48 Group to use when no root privileges are required.
49 '';
50 };
51
52 spoolDir = mkOption {
53 type = types.string;
54 default = "/var/spool/exim";
55 description = ''
56 Location of the spool directory of exim.
57 '';
58 };
59
60 };
61
62 };
63
64
65 ###### implementation
66
67 config = mkIf cfg.enable {
68
69 environment = {
70 etc."exim.conf".text = ''
71 exim_user = ${cfg.user}
72 exim_group = ${cfg.group}
73 exim_path = /var/setuid-wrappers/exim
74 spool_directory = ${cfg.spoolDir}
75 ${cfg.config}
76 '';
77 systemPackages = [ exim ];
78 };
79
80 users.extraUsers = singleton {
81 name = cfg.user;
82 description = "Exim mail transfer agent user";
83 uid = config.ids.uids.exim;
84 group = cfg.group;
85 };
86
87 users.extraGroups = singleton {
88 name = cfg.group;
89 gid = config.ids.gids.exim;
90 };
91
92 security.setuidPrograms = [ "exim" ];
93
94 systemd.services.exim = {
95 description = "Exim Mail Daemon";
96 wantedBy = [ "multi-user.target" ];
97 serviceConfig = {
98 ExecStart = "${exim}/bin/exim -bdf -q30m";
99 ExecReload = "${coreutils}/bin/kill -HUP $MAINPID";
100 };
101 preStart = ''
102 if ! test -d ${cfg.spoolDir}; then
103 ${coreutils}/bin/mkdir -p ${cfg.spoolDir}
104 ${coreutils}/bin/chown ${cfg.user}:${cfg.group} ${cfg.spoolDir}
105 fi
106 '';
107 };
108
109 };
110
111}