8fbdb40ef0
See: https://www.freedesktop.org/software/systemd/man/systemd.special.html#time-sync.target
102 lines
2 KiB
Nix
102 lines
2 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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inherit (pkgs) ntp;
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cfg = config.services.ntp;
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stateDir = "/var/lib/ntp";
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ntpUser = "ntp";
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configFile = pkgs.writeText "ntp.conf" ''
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driftfile ${stateDir}/ntp.drift
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restrict 127.0.0.1
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restrict -6 ::1
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${toString (map (server: "server " + server + " iburst\n") cfg.servers)}
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'';
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ntpFlags = "-c ${configFile} -u ${ntpUser}:nogroup ${toString cfg.extraFlags}";
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in
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{
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###### interface
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options = {
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services.ntp = {
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enable = mkOption {
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default = !config.boot.isContainer;
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description = ''
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Whether to synchronise your machine's time using the NTP
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protocol.
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'';
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};
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servers = mkOption {
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default = [
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"0.nixos.pool.ntp.org"
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"1.nixos.pool.ntp.org"
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"2.nixos.pool.ntp.org"
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"3.nixos.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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extraFlags = mkOption {
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type = types.listOf types.str;
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description = "Extra flags passed to the ntpd command.";
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default = [];
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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.ntp.enable {
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# Make tools such as ntpq available in the system path.
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environment.systemPackages = [ pkgs.ntp ];
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users.extraUsers = singleton
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{ name = ntpUser;
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uid = config.ids.uids.ntp;
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description = "NTP daemon user";
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home = stateDir;
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};
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systemd.services.ntpd =
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{ description = "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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preStart =
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''
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mkdir -m 0755 -p ${stateDir}
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chown ${ntpUser} ${stateDir}
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'';
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serviceConfig = {
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ExecStart = "@${ntp}/bin/ntpd ntpd -g ${ntpFlags}";
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Type = "forking";
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};
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};
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};
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}
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