straylight: build tracker from git input

configs/tracker.nix

@@ -1,28 +1,24 @@
 # tracker: single-host project tracker web app (hackerman edition).
-# Wraps the prebuilt Go binary in ./tracker-bin; rebuild it with
-#   CGO_ENABLED=0 go build -o tracker-bin .
-{ config, lib, pkgs, ... }:
+# Built from the git repo (https://git.wntrmute.dev/kyle/tracker) via the
+# `tracker` flake input; see the flake.nix in that repo for the package.
+{ config, lib, pkgs, inputs, ... }:
 
 with lib;
 
 let
   cfg = config.services.tracker;
-
-  trackerPackage = pkgs.stdenvNoCC.mkDerivation {
-    pname = "tracker";
-    version = "0.1.0";
-    src = ./tracker-bin;
-    dontUnpack = true;
-    dontBuild = true;
-    installPhase = ''
-      install -Dm755 $src $out/bin/tracker
-    '';
-  };
 in
 {
   options.services.tracker = {
     enable = mkEnableOption "tracker project tracker web app";
 
+    package = mkOption {
+      type = types.package;
+      default = inputs.tracker.packages.x86_64-linux.default;
+      defaultText = literalExpression "inputs.tracker.packages.x86_64-linux.default";
+      description = "The tracker package to use.";
+    };
+
     address = mkOption {
       type = types.str;
       default = ":8420";
@@ -53,7 +49,7 @@ in
         User = "tracker";
         Group = "tracker";
         StateDirectory = "tracker";
-        ExecStart = "${trackerPackage}/bin/tracker -addr ${cfg.address} -db /var/lib/tracker/tracker.db";
+        ExecStart = "${cfg.package}/bin/tracker -addr ${cfg.address} -db /var/lib/tracker/tracker.db";
         Restart = "on-failure";
         RestartSec = 5;