nixpkgs/nixos/modules/system/boot/timesyncd.nix

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{ config, lib, pkgs, ... }:
with lib;
{
options = {
services.timesyncd.enable = mkOption {
default = false;
type = types.bool;
description = ''
Enables the systemd NTP client daemon.
'';
};
};
config = mkIf config.services.timesyncd.enable {
systemd.additionalUpstreamSystemUnits = [ "systemd-timesyncd.service" ];
systemd.services.systemd-timesyncd = {
wantedBy = [ "sysinit.target" ];
restartTriggers = [ config.environment.etc."systemd/timesyncd.conf".source ];
};
environment.etc."systemd/timesyncd.conf".text = ''
[Time]
NTP=${concatStringsSep " " config.services.ntp.servers}
'';
systemd.services.ntpd.enable = false;
users.extraUsers.systemd-timesync.uid = config.ids.uids.systemd-timesync;
users.extraGroups.systemd-timesync.gid = config.ids.gids.systemd-timesync;
};
}