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102 lines
2.0 KiB
Nix
102 lines
2.0 KiB
Nix
{ config, pkgs, ... }:
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with pkgs.lib;
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let
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inherit (pkgs) ntp;
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stateDir = "/var/lib/ntp";
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ntpUser = "ntp";
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servers = config.services.ntp.servers;
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modprobe = config.system.sbin.modprobe;
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configFile = pkgs.writeText "ntp.conf" ''
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driftfile ${stateDir}/ntp.drift
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# Keep the drift file in ${stateDir}/ntp.drift. However, since we
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# chroot to ${stateDir}, we have to specify it as /ntp.drift.
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driftfile /ntp.drift
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${toString (map (server: "server " + server + " iburst\n") servers)}
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'';
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ntpFlags = "-c ${configFile} -u ${ntpUser}:nogroup -i ${stateDir}";
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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 = true;
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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.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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};
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};
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###### implementation
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config = mkIf config.services.ntp.enable {
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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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jobs.ntpd =
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{ description = "NTP daemon";
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startOn = "ip-up";
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path = [ ntp ];
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preStart =
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''
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mkdir -m 0755 -p ${stateDir}
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chown ${ntpUser} ${stateDir}
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# Needed to run ntpd as an unprivileged user.
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${modprobe}/sbin/modprobe --quiet capability || true
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# !!! This can hang indefinitely if the network is down or
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# the servers are unreachable. This is particularly bad
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# because Upstart cannot kill jobs stuck in the start
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# phase. Thus a hanging ntpd job can block system
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# shutdown.
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# ntpd -q -g ${ntpFlags}
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'';
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exec = "ntpd -g -n ${ntpFlags}";
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};
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};
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}
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