29027fd1e1
Using pkgs.lib on the spine of module evaluation is problematic because the pkgs argument depends on the result of module evaluation. To prevent an infinite recursion, pkgs and some of the modules are evaluated twice, which is inefficient. Using ‘with lib’ prevents this problem.
95 lines
1.8 KiB
Nix
95 lines
1.8 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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stateDir = "/var/lib/ntp";
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ntpUser = "ntp";
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configFile = pkgs.writeText "ntp.conf" ''
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# Keep the drift file in ${stateDir}/ntp.drift. However, since we
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# chroot to ${stateDir}, we have to specify it as /ntp.drift.
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driftfile /ntp.drift
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restrict default kod nomodify notrap nopeer noquery
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restrict -6 default kod nomodify notrap nopeer noquery
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restrict 127.0.0.1
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restrict -6 ::1
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${toString (map (server: "server " + server + " iburst\n") config.services.ntp.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 = !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.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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# 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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jobs.ntpd =
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{ description = "NTP Daemon";
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wantedBy = [ "ip-up.target" ];
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partOf = [ "ip-up.target" ];
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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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'';
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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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