85 lines
2.3 KiB
Nix
85 lines
2.3 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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cfg = config.sane.services.dyn-dns;
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in
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{
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options = {
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sane.services.dyn-dns = {
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enable = mkOption {
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default = false;
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type = types.bool;
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};
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ipPath = mkOption {
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default = "/var/lib/uninsane/wan.txt";
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type = types.str;
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description = "where to store the latest WAN IPv4 address";
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};
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ipCmd = mkOption {
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default = "${pkgs.sane-scripts}/bin/sane-ip-check-router-wan";
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type = types.path;
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description = "command to run to query the current WAN IP";
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};
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interval = mkOption {
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type = types.str;
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default = "10min";
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description = "systemd time string for how frequently to re-check the IP";
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};
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restartOnChange = mkOption {
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type = types.listOf types.str;
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default = [];
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description = "list of systemd unit files to restart when the IP changes";
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};
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};
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};
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config = mkIf cfg.enable {
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systemd.services.dyn-dns = {
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description = "update this host's record of its WAN IP";
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after = [ "network.target" ];
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restartTriggers = [(builtins.toJSON cfg)];
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serviceConfig.Type = "oneshot";
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script = ''
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mkdir -p $(dirname '${cfg.ipPath}')
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newIp=$(${cfg.ipCmd})
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# systemd path units are triggered on any file write action,
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# regardless of content change. so only update the file if our IP *actually* changed
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if [ "$newIp" != "$(cat '${cfg.ipPath}')" ]
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then
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echo "$newIp" > '${cfg.ipPath}'
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fi
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'';
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};
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systemd.timers.dyn-dns = {
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wantedBy = [ "multi-user.target" ];
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timerConfig = {
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OnStartupSec = cfg.interval;
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OnUnitActiveSec = cfg.interval;
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};
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};
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systemd.paths.dyn-dns-watcher = {
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before = [ "dyn-dns.service" ];
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wantedBy = [ "dyn-dns.service" ];
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pathConfig = {
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Unit = "dyn-dns-reactor.service";
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PathChanged = [ cfg.ipPath ];
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};
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};
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systemd.services.dyn-dns-reactor = {
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description = "react to the system's WAN IP changing";
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serviceConfig.Type = "oneshot";
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script = if cfg.restartOnChange != [] then ''
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${pkgs.systemd}/bin/systemctl restart ${toString cfg.restartOnChange}
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'' else "${pkgs.coreutils}/bin/true";
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};
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};
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}
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