pyrox.dev
1{ config, lib, pkgs, ... }:
2
3with lib;
4
5let
6
7 cfg = config.services.atd;
8
9 inherit (pkgs) at;
10
11in
12
13{
14
15 ###### interface
16
17 options = {
18
19 services.atd.enable = mkOption {
20 type = types.bool;
21 default = false;
22 description = ''
23 Whether to enable the <command>at</command> daemon, a command scheduler.
24 '';
25 };
26
27 services.atd.allowEveryone = mkOption {
28 type = types.bool;
29 default = false;
30 description = ''
31 Whether to make <filename>/var/spool/at{jobs,spool}</filename>
32 writeable by everyone (and sticky). This is normally not
33 needed since the <command>at</command> commands are
34 setuid/setgid <literal>atd</literal>.
35 '';
36 };
37
38 };
39
40
41 ###### implementation
42
43 config = mkIf cfg.enable {
44
45 security.wrappers = builtins.listToAttrs (
46 map (program: { name = "${program}"; value = {
47 source = "${at}/bin/${program}";
48 owner = "atd";
49 group = "atd";
50 setuid = true;
51 setgid = true;
52 };}) [ "at" "atq" "atrm" "batch" ]);
53
54 environment.systemPackages = [ at ];
55
56 security.pam.services.atd = {};
57
58 users.extraUsers = singleton
59 { name = "atd";
60 uid = config.ids.uids.atd;
61 description = "atd user";
62 home = "/var/empty";
63 };
64
65 users.extraGroups = singleton
66 { name = "atd";
67 gid = config.ids.gids.atd;
68 };
69
70 systemd.services.atd = {
71 description = "Job Execution Daemon (atd)";
72 after = [ "systemd-udev-settle.service" ];
73 wants = [ "systemd-udev-settle.service" ];
74 wantedBy = [ "multi-user.target" ];
75
76 path = [ at ];
77
78 preStart = ''
79 # Snippets taken and adapted from the original `install' rule of
80 # the makefile.
81
82 # We assume these values are those actually used in Nixpkgs for
83 # `at'.
84 spooldir=/var/spool/atspool
85 jobdir=/var/spool/atjobs
86 etcdir=/etc/at
87
88 for dir in "$spooldir" "$jobdir" "$etcdir"; do
89 if [ ! -d "$dir" ]; then
90 mkdir -p "$dir"
91 chown atd:atd "$dir"
92 fi
93 done
94 chmod 1770 "$spooldir" "$jobdir"
95 ${if cfg.allowEveryone then ''chmod a+rwxt "$spooldir" "$jobdir" '' else ""}
96 if [ ! -f "$etcdir"/at.deny ]; then
97 touch "$etcdir"/at.deny
98 chown root:atd "$etcdir"/at.deny
99 chmod 640 "$etcdir"/at.deny
100 fi
101 if [ ! -f "$jobdir"/.SEQ ]; then
102 touch "$jobdir"/.SEQ
103 chown atd:atd "$jobdir"/.SEQ
104 chmod 600 "$jobdir"/.SEQ
105 fi
106 '';
107
108 script = "atd";
109
110 serviceConfig.Type = "forking";
111 };
112 };
113}