blob: 34728455a21209f0f890481a5550e01640916377 (
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
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
|
{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.services.chrony;
chronyPkg = cfg.package;
stateDir = cfg.directory;
driftFile = "${stateDir}/chrony.drift";
keyFile = "${stateDir}/chrony.keys";
configFile = pkgs.writeText "chrony.conf" ''
${concatMapStringsSep "\n" (server: "server " + server + " " + cfg.serverOption + optionalString (cfg.enableNTS) " nts") cfg.servers}
${optionalString
(cfg.initstepslew.enabled && (cfg.servers != []))
"initstepslew ${toString cfg.initstepslew.threshold} ${concatStringsSep " " cfg.servers}"
}
driftfile ${driftFile}
keyfile ${keyFile}
${optionalString (cfg.enableNTS) "ntsdumpdir ${stateDir}"}
${optionalString (!config.time.hardwareClockInLocalTime) "rtconutc"}
${cfg.extraConfig}
'';
chronyFlags = "-n -m -u chrony -f ${configFile} ${toString cfg.extraFlags}";
in
{
options = {
services.chrony = {
enable = mkOption {
type = types.bool;
default = false;
description = ''
Whether to synchronise your machine's time using chrony.
Make sure you disable NTP if you enable this service.
'';
};
package = mkOption {
type = types.package;
default = pkgs.chrony;
defaultText = literalExpression "pkgs.chrony";
description = ''
Which chrony package to use.
'';
};
servers = mkOption {
default = config.networking.timeServers;
defaultText = literalExpression "config.networking.timeServers";
type = types.listOf types.str;
description = ''
The set of NTP servers from which to synchronise.
'';
};
serverOption = mkOption {
default = "iburst";
type = types.enum [ "iburst" "offline" ];
description = ''
Set option for server directives.
Use "iburst" to rapidly poll on startup. Recommended if your machine
is consistently online.
Use "offline" to prevent polling on startup. Recommended if your
machine boots offline or is otherwise frequently offline.
'';
};
enableNTS = mkOption {
type = types.bool;
default = false;
description = ''
Whether to enable Network Time Security authentication.
Make sure it is supported by your selected NTP server(s).
'';
};
initstepslew = {
enabled = mkOption {
type = types.bool;
default = true;
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.
'';
};
threshold = mkOption {
type = types.either types.float types.int;
default = 1000; # by default, same threshold as 'ntpd -g' (1000s)
description = ''
The threshold of system clock error (in seconds) above which the
clock will be stepped. If the correction required is less than the
threshold, a slew is used instead.
'';
};
};
directory = mkOption {
type = types.str;
default = "/var/lib/chrony";
description = "Directory where chrony state is stored.";
};
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 = [ chronyPkg ];
users.groups.chrony.gid = config.ids.gids.chrony;
users.users.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.tmpfiles.rules = [
"d ${stateDir} 0755 chrony chrony - -"
"f ${driftFile} 0640 chrony chrony -"
"f ${keyFile} 0640 chrony chrony -"
];
systemd.services.chronyd =
{ description = "chrony NTP daemon";
wantedBy = [ "multi-user.target" ];
wants = [ "time-sync.target" ];
before = [ "time-sync.target" ];
after = [ "network.target" "nss-lookup.target" ];
conflicts = [ "ntpd.service" "systemd-timesyncd.service" ];
path = [ chronyPkg ];
unitConfig.ConditionCapability = "CAP_SYS_TIME";
serviceConfig =
{ Type = "simple";
ExecStart = "${chronyPkg}/bin/chronyd ${chronyFlags}";
ProtectHome = "yes";
ProtectSystem = "full";
PrivateTmp = "yes";
};
};
};
}
|