create sane.services.dyn-dns
to manage dynamic DNS stuff
not yet integrated into servo
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8169f7c6b2
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@ -14,6 +14,7 @@
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pkgs.freshrss
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];
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sane.impermanence.enable = true;
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sane.services.dyn-dns.enable = true;
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# sane.services.duplicity.enable = true; # TODO: re-enable after HW upgrade
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boot.loader.efi.canTouchEfiVariables = false;
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@ -2,6 +2,7 @@
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{
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imports = [
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./duplicity.nix
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./dyn-dns.nix
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./kiwix-serve.nix
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./nixserve.nix
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./trust-dns.nix
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78
modules/services/dyn-dns.nix
Normal file
78
modules/services/dyn-dns.nix
Normal file
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@ -0,0 +1,78 @@
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{ 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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${cfg.ipCmd} > "${cfg.ipPath}"
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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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