1 files changed, 119 insertions, 0 deletions
diff --git a/nixpkgs/nixos/modules/services/misc/gpsd.nix b/nixpkgs/nixos/modules/services/misc/gpsd.nix
new file mode 100644
index 00000000000..3bfcb636a3c
--- /dev/null
+++ b/nixpkgs/nixos/modules/services/misc/gpsd.nix
@@ -0,0 +1,119 @@
+{ 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.
+        '';
+      };
+
+      nowait = mkOption {
+        type = types.bool;
+        default = false;
+        description = ''
+          don't wait for client connects to poll GPS
+        '';
+      };
+
+      port = mkOption {
+        type = types.int;
+        default = 2947;
+        description = ''
+          The port where to listen for TCP connections.
+        '';
+      };
+
+      debugLevel = mkOption {
+        type = types.int;
+        default = 0;
+        description = ''
+          The debugging level.
+        '';
+      };
+
+    };
+
+  };
+
+
+  ###### implementation
+
+  config = mkIf cfg.enable {
+
+    users.users = singleton
+      { name = "gpsd";
+        inherit uid;
+        description = "gpsd daemon user";
+        home = "/var/empty";
+      };
+
+    users.groups = 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}"                             \
+            ${optionalString cfg.readonly "-b"}                   \
+            ${optionalString cfg.nowait "-n"}                     \
+            "${cfg.device}"
+        '';
+      };
+    };
+
+  };
+
+}