92 lines
3.7 KiB
Nix
92 lines
3.7 KiB
Nix
{ config, lib, ... }:
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with lib;
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{
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options = {
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services.timesyncd = {
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enable = mkOption {
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default = !config.boot.isContainer;
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defaultText = literalExpression "!config.boot.isContainer";
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type = types.bool;
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description = lib.mdDoc ''
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Enables the systemd NTP client daemon.
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'';
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};
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servers = mkOption {
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default = config.networking.timeServers;
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defaultText = literalExpression "config.networking.timeServers";
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type = types.listOf types.str;
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description = lib.mdDoc ''
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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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extraConfig = mkOption {
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default = "";
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type = types.lines;
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example = ''
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PollIntervalMaxSec=180
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'';
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description = lib.mdDoc ''
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Extra config options for systemd-timesyncd. See
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[
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timesyncd.conf(5)](https://www.freedesktop.org/software/systemd/man/timesyncd.conf.html) for available options.
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'';
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};
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};
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};
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config = mkIf config.services.timesyncd.enable {
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systemd.additionalUpstreamSystemUnits = [ "systemd-timesyncd.service" ];
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systemd.services.systemd-timesyncd = {
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wantedBy = [ "sysinit.target" ];
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aliases = [ "dbus-org.freedesktop.timesync1.service" ];
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restartTriggers = [ config.environment.etc."systemd/timesyncd.conf".source ];
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# systemd-timesyncd disables DNSSEC validation in the nss-resolve module by setting SYSTEMD_NSS_RESOLVE_VALIDATE to 0 in the unit file.
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# This is required in order to solve the chicken-and-egg problem when DNSSEC validation needs the correct time to work, but to set the
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# correct time, we need to connect to an NTP server, which usually requires resolving its hostname.
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# In order for nss-resolve to be able to read this environment variable we patch systemd-timesyncd to disable NSCD and use NSS modules directly.
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# This means that systemd-timesyncd needs to have NSS modules path in LD_LIBRARY_PATH. When systemd-resolved is disabled we still need to set
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# NSS module path so that systemd-timesyncd keeps using other NSS modules that are configured in the system.
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environment.LD_LIBRARY_PATH = config.system.nssModules.path;
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preStart = (
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# Ensure that we have some stored time to prevent
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# systemd-timesyncd to resort back to the fallback time. If
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# the file doesn't exist we assume that our current system
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# clock is good enough to provide an initial value.
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''
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if ! [ -f /var/lib/systemd/timesync/clock ]; then
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test -d /var/lib/systemd/timesync || mkdir -p /var/lib/systemd/timesync
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touch /var/lib/systemd/timesync/clock
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fi
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'' +
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# workaround an issue of systemd-timesyncd not starting due to upstream systemd reverting their dynamic users changes
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# - https://github.com/NixOS/nixpkgs/pull/61321#issuecomment-492423742
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# - https://github.com/systemd/systemd/issues/12131
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(lib.optionalString (versionOlder config.system.stateVersion "19.09") ''
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if [ -L /var/lib/systemd/timesync ]; then
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rm /var/lib/systemd/timesync
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mv /var/lib/private/systemd/timesync /var/lib/systemd/timesync
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fi
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'')
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);
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};
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environment.etc."systemd/timesyncd.conf".text = ''
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[Time]
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NTP=${concatStringsSep " " config.services.timesyncd.servers}
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${config.services.timesyncd.extraConfig}
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'';
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users.users.systemd-timesync = {
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uid = config.ids.uids.systemd-timesync;
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group = "systemd-timesync";
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};
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users.groups.systemd-timesync.gid = config.ids.gids.systemd-timesync;
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};
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}
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