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29027fd1e1
Using pkgs.lib on the spine of module evaluation is problematic because the pkgs argument depends on the result of module evaluation. To prevent an infinite recursion, pkgs and some of the modules are evaluated twice, which is inefficient. Using ‘with lib’ prevents this problem.
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.uniq 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.uniq 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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