nixpkgs/nixos/modules/services/misc/gpsd.nix
Eelco Dolstra 29027fd1e1 Rewrite ‘with pkgs.lib’ -> ‘with lib’
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.
2014-04-14 16:26:48 +02:00

111 lines
2.6 KiB
Nix

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