blob: c74476c7a155837deebf5ceaf2de40373b598a47 (
plain) (
blame)
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
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
|
{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.services.chrony;
stateDir = "/var/lib/chrony";
keyFile = "${stateDir}/chrony.keys";
configFile = pkgs.writeText "chrony.conf" ''
${concatMapStringsSep "\n" (server: "server " + server + " iburst") cfg.servers}
${optionalString
(cfg.initstepslew.enabled && (cfg.servers != []))
"initstepslew ${toString cfg.initstepslew.threshold} ${concatStringsSep " " cfg.servers}"
}
driftfile ${stateDir}/chrony.drift
keyfile ${keyFile}
${optionalString (!config.time.hardwareClockInLocalTime) "rtconutc"}
${cfg.extraConfig}
'';
chronyFlags = "-n -m -u chrony -f ${configFile} ${toString cfg.extraFlags}";
in
{
options = {
services.chrony = {
enable = mkOption {
default = false;
description = ''
Whether to synchronise your machine's time using chrony.
Make sure you disable NTP if you enable this service.
'';
};
servers = mkOption {
default = config.networking.timeServers;
description = ''
The set of NTP servers from which to synchronise.
'';
};
initstepslew = mkOption {
default = {
enabled = true;
threshold = 1000; # by default, same threshold as 'ntpd -g' (1000s)
};
description = ''
Allow chronyd to make a rapid measurement of the system clock error at
boot time, and to correct the system clock by stepping before normal
operation begins.
'';
};
extraConfig = mkOption {
type = types.lines;
default = "";
description = ''
Extra configuration directives that should be added to
<literal>chrony.conf</literal>
'';
};
extraFlags = mkOption {
default = [];
example = [ "-s" ];
type = types.listOf types.str;
description = "Extra flags passed to the chronyd command.";
};
};
};
config = mkIf cfg.enable {
meta.maintainers = with lib.maintainers; [ thoughtpolice ];
environment.systemPackages = [ pkgs.chrony ];
users.groups = singleton
{ name = "chrony";
gid = config.ids.gids.chrony;
};
users.users = singleton
{ name = "chrony";
uid = config.ids.uids.chrony;
group = "chrony";
description = "chrony daemon user";
home = stateDir;
};
services.timesyncd.enable = mkForce false;
systemd.services.systemd-timedated.environment = { SYSTEMD_TIMEDATED_NTP_SERVICES = "chronyd.service"; };
systemd.services.chronyd =
{ description = "chrony NTP daemon";
wantedBy = [ "multi-user.target" ];
wants = [ "time-sync.target" ];
before = [ "time-sync.target" ];
after = [ "network.target" ];
conflicts = [ "ntpd.service" "systemd-timesyncd.service" ];
path = [ pkgs.chrony ];
preStart = ''
mkdir -m 0755 -p ${stateDir}
touch ${keyFile}
chmod 0640 ${keyFile}
chown chrony:chrony ${stateDir} ${keyFile}
'';
unitConfig.ConditionCapability = "CAP_SYS_TIME";
serviceConfig =
{ Type = "simple";
ExecStart = "${pkgs.chrony}/bin/chronyd ${chronyFlags}";
ProtectHome = "yes";
ProtectSystem = "full";
PrivateTmp = "yes";
};
};
};
}
|