118 lines
2.5 KiB
Nix
118 lines
2.5 KiB
Nix
{ config, pkgs, ... }:
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with pkgs.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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chronyUser = "chrony";
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cfg = config.services.chrony;
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configFile = pkgs.writeText "chrony.conf" ''
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${toString (map (server: "server " + server + "\n") cfg.servers)}
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${optionalString cfg.initstepslew.enabled ''
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initstepslew ${toString cfg.initstepslew.threshold} ${toString (map (server: server + " ") cfg.initstepslew.servers)}
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''}
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driftfile ${stateDir}/chrony.drift
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${optionalString (!config.time.hardwareClockInLocalTime) "rtconutc"}
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${cfg.extraConfig}
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'';
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chronyFlags = "-m -f ${configFile} -u ${chronyUser}";
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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 = [
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"0.pool.ntp.org"
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"1.pool.ntp.org"
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"2.pool.ntp.org"
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];
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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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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 config.services.chrony.enable {
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# Make chronyc available in the system path
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environment.systemPackages = [ pkgs.chrony ];
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users.extraUsers = singleton
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{ name = chronyUser;
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uid = config.ids.uids.chrony;
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description = "chrony daemon user";
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home = stateDir;
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};
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jobs.chronyd =
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{ description = "chrony daemon";
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wantedBy = [ "ip-up.target" ];
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partOf = [ "ip-up.target" ];
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path = [ chrony ];
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preStart =
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''
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mkdir -m 0755 -p ${stateDir}
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chown ${chronyUser} ${stateDir}
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'';
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exec = "chronyd -n ${chronyFlags}";
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};
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};
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}
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