nixpkgs/modules/services/networking/ntpd.nix
Eelco Dolstra 573877c1ac * Use boot.kernelModules everywhere instead of explicit calls to
modprobe.
* Move the implementation of boot.kernelModules from the udev job to
  the activation script.  This prevents races with the udev job.
* Drop references to the "capability" kernel module, which no longer
  exists.

svn path=/nixos/trunk/; revision=33208
2012-03-17 17:26:17 +00:00

87 lines
1.5 KiB
Nix

{ config, pkgs, ... }:
with pkgs.lib;
let
inherit (pkgs) ntp;
stateDir = "/var/lib/ntp";
ntpUser = "ntp";
configFile = pkgs.writeText "ntp.conf" ''
# Keep the drift file in ${stateDir}/ntp.drift. However, since we
# chroot to ${stateDir}, we have to specify it as /ntp.drift.
driftfile /ntp.drift
${toString (map (server: "server " + server + " iburst\n") config.services.ntp.servers)}
'';
ntpFlags = "-c ${configFile} -u ${ntpUser}:nogroup -i ${stateDir}";
in
{
###### interface
options = {
services.ntp = {
enable = mkOption {
default = true;
description = ''
Whether to synchronise your machine's time using the NTP
protocol.
'';
};
servers = mkOption {
default = [
"0.pool.ntp.org"
"1.pool.ntp.org"
"2.pool.ntp.org"
];
description = ''
The set of NTP servers from which to synchronise.
'';
};
};
};
###### implementation
config = mkIf config.services.ntp.enable {
users.extraUsers = singleton
{ name = ntpUser;
uid = config.ids.uids.ntp;
description = "NTP daemon user";
home = stateDir;
};
jobs.ntpd =
{ description = "NTP daemon";
startOn = "ip-up";
path = [ ntp ];
preStart =
''
mkdir -m 0755 -p ${stateDir}
chown ${ntpUser} ${stateDir}
'';
exec = "ntpd -g -n ${ntpFlags}";
};
};
}