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.
118 lines
2.5 KiB
Nix
118 lines
2.5 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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inherit (pkgs) chrony;
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stateDir = "/var/lib/chrony";
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chronyUser = "chrony";
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cfg = config.services.chrony;
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configFile = pkgs.writeText "chrony.conf" ''
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${toString (map (server: "server " + server + "\n") cfg.servers)}
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${optionalString cfg.initstepslew.enabled ''
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initstepslew ${toString cfg.initstepslew.threshold} ${toString (map (server: server + " ") cfg.initstepslew.servers)}
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''}
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driftfile ${stateDir}/chrony.drift
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${optionalString (!config.time.hardwareClockInLocalTime) "rtconutc"}
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${cfg.extraConfig}
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'';
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chronyFlags = "-m -f ${configFile} -u ${chronyUser}";
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in
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{
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###### interface
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options = {
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services.chrony = {
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enable = mkOption {
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default = false;
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description = ''
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Whether to synchronise your machine's time using chrony.
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Make sure you disable NTP if you enable this service.
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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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initstepslew = mkOption {
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default = {
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enabled = true;
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threshold = 1000; # by default, same threshold as 'ntpd -g' (1000s)
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servers = cfg.servers;
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};
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description = ''
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Allow chronyd to make a rapid measurement of the system clock error at
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boot time, and to correct the system clock by stepping before normal
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operation begins.
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'';
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};
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extraConfig = mkOption {
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default = "";
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description = ''
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Extra configuration directives that should be added to
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<literal>chrony.conf</literal>
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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.chrony.enable {
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# Make chronyc available in the system path
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environment.systemPackages = [ pkgs.chrony ];
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users.extraUsers = singleton
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{ name = chronyUser;
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uid = config.ids.uids.chrony;
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description = "chrony daemon user";
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home = stateDir;
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};
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jobs.chronyd =
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{ description = "chrony daemon";
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wantedBy = [ "ip-up.target" ];
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partOf = [ "ip-up.target" ];
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path = [ chrony ];
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preStart =
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''
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mkdir -m 0755 -p ${stateDir}
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chown ${chronyUser} ${stateDir}
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'';
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exec = "chronyd -n ${chronyFlags}";
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};
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};
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}
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