1590461887
- most nixos user only require time synchronisation, while ntpd implements a battery-included ntp server (1,215 LOCs of C-Code vs 64,302) - timesyncd support ntp server per interface (if configured through dhcp for instance) - timesyncd is already included in the systemd package, switching to it would save a little disk space (1,5M)
133 lines
3 KiB
Nix
133 lines
3 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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inherit (pkgs) chrony;
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stateDir = "/var/lib/chrony";
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keyFile = "/etc/chrony.keys";
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cfg = config.services.chrony;
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in
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{
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###### interface
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options = {
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services.chrony = {
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enable = mkOption {
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default = false;
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description = ''
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Whether to synchronise your machine's time using chrony.
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Make sure you disable NTP if you enable this service.
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'';
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};
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servers = mkOption {
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default = config.networking.timeServers;
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description = ''
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The set of NTP servers from which to synchronise.
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'';
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};
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initstepslew = mkOption {
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default = {
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enabled = true;
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threshold = 1000; # by default, same threshold as 'ntpd -g' (1000s)
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servers = cfg.servers;
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};
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description = ''
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Allow chronyd to make a rapid measurement of the system clock error at
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boot time, and to correct the system clock by stepping before normal
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operation begins.
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'';
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};
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extraConfig = mkOption {
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type = types.lines;
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default = "";
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description = ''
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Extra configuration directives that should be added to
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<literal>chrony.conf</literal>
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'';
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};
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};
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};
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###### implementation
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config = mkIf cfg.enable {
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# Make chronyc available in the system path
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environment.systemPackages = [ pkgs.chrony ];
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environment.etc."chrony.conf".text =
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''
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${concatMapStringsSep "\n" (server: "server " + server) cfg.servers}
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${optionalString
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cfg.initstepslew.enabled
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"initstepslew ${toString cfg.initstepslew.threshold} ${concatStringsSep " " cfg.initstepslew.servers}"
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}
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driftfile ${stateDir}/chrony.drift
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keyfile ${keyFile}
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generatecommandkey
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${optionalString (!config.time.hardwareClockInLocalTime) "rtconutc"}
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${cfg.extraConfig}
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'';
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users.extraGroups = singleton
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{ name = "chrony";
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gid = config.ids.gids.chrony;
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};
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users.extraUsers = singleton
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{ name = "chrony";
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uid = config.ids.uids.chrony;
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group = "chrony";
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description = "chrony daemon user";
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home = stateDir;
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};
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systemd.services.timesyncd.enable = mkForce false;
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systemd.services.chronyd =
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{ description = "chrony NTP daemon";
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wantedBy = [ "multi-user.target" ];
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wants = [ "time-sync.target" ];
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before = [ "time-sync.target" ];
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after = [ "network.target" ];
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conflicts = [ "ntpd.service" "systemd-timesyncd.service" ];
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path = [ pkgs.chrony ];
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preStart =
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''
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mkdir -m 0755 -p ${stateDir}
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touch ${keyFile}
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chmod 0640 ${keyFile}
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chown chrony:chrony ${stateDir} ${keyFile}
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'';
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serviceConfig =
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{ ExecStart = "${pkgs.chrony}/bin/chronyd -n -m -u chrony";
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};
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};
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};
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}
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