111 lines
2.6 KiB
Nix
111 lines
2.6 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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uid = config.ids.uids.gpsd;
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gid = config.ids.gids.gpsd;
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cfg = config.services.gpsd;
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in
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{
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###### interface
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options = {
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services.gpsd = {
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enable = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Whether to enable `gpsd', a GPS service daemon.
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'';
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};
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device = mkOption {
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type = types.str;
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default = "/dev/ttyUSB0";
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description = ''
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A device may be a local serial device for GPS input, or a URL of the form:
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<literal>[{dgpsip|ntrip}://][user:passwd@]host[:port][/stream]</literal>
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in which case it specifies an input source for DGPS or ntrip data.
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'';
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};
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readonly = mkOption {
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type = types.bool;
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default = true;
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description = ''
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Whether to enable the broken-device-safety, otherwise
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known as read-only mode. Some popular bluetooth and USB
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receivers lock up or become totally inaccessible when
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probed or reconfigured. This switch prevents gpsd from
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writing to a receiver. This means that gpsd cannot
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configure the receiver for optimal performance, but it
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also means that gpsd cannot break the receiver. A better
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solution would be for Bluetooth to not be so fragile. A
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platform independent method to identify
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serial-over-Bluetooth devices would also be nice.
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'';
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};
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port = mkOption {
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type = types.int;
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default = 2947;
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description = ''
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The port where to listen for TCP connections.
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'';
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};
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debugLevel = mkOption {
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type = types.int;
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default = 0;
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description = ''
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The debugging level.
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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 cfg.enable {
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users.extraUsers = singleton
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{ name = "gpsd";
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inherit uid;
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description = "gpsd daemon user";
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home = "/var/empty";
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};
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users.extraGroups = singleton
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{ name = "gpsd";
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inherit gid;
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};
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systemd.services.gpsd = {
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description = "GPSD daemon";
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wantedBy = [ "multi-user.target" ];
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after = [ "network.target" ];
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serviceConfig = {
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Type = "forking";
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ExecStart = ''
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${pkgs.gpsd}/sbin/gpsd -D "${toString cfg.debugLevel}" \
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-S "${toString cfg.port}" \
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${if cfg.readonly then "-b" else ""} \
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"${cfg.device}"
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'';
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};
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};
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};
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}
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