nixpkgs/nixos/modules/services/misc/tzupdate.nix

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{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.services.tzupdate;
in {
options.services.tzupdate = {
enable = mkOption {
type = types.bool;
default = false;
description = lib.mdDoc ''
Enable the tzupdate timezone updating service. This provides
a one-shot service which can be activated with systemctl to
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update the timezone.
'';
};
};
config = mkIf cfg.enable {
# We need to have imperative time zone management for this to work.
# This will give users an error if they have set an explicit time
# zone, which is better than silently overriding it.
time.timeZone = null;
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# We provide a one-shot service which can be manually run. We could
# provide a service that runs on startup, but it's tricky to get
# a service to run after you have *internet* access.
systemd.services.tzupdate = {
description = "tzupdate timezone update service";
wants = [ "network-online.target" ];
after = [ "network-online.target" ];
serviceConfig = {
Type = "oneshot";
# We could link directly into pkgs.tzdata, but at least timedatectl seems
# to expect the symlink to point directly to a file in etc.
# Setting the "debian timezone file" to point at /dev/null stops it doing anything.
ExecStart = "${pkgs.tzupdate}/bin/tzupdate -z /etc/zoneinfo -d /dev/null";
};
};
};
meta.maintainers = [ maintainers.michaelpj ];
}