nix: initial nixos module; complete packaging

Signed-off-by: NotAShelf <raf@notashelf.dev>
Change-Id: I59ec5a4f67ddae2139e72ef4c0c113366a6a6964

nix/package.nix

@@ -1,11 +1,40 @@
-{buildGoModule}:
-buildGoModule {
-  pname = "sample-go";
-  version = "0.0.1";
+{
+  lib,
+  buildGoModule,
+}:
+buildGoModule (finalAttrs: {
+  pname = "watchdog";
+  version = "0.1.0";
 
-  src = ../.;
+  src = let
+    fs = lib.fileset;
+    s = ../.;
+  in
+    fs.toSource {
+      root = s;
+      fileset = fs.unions [
+        (s + /cmd)
+        (s + /internal)
+        (s + /go.mod)
+        (s + /go.sum)
+      ];
+    };
 
-  vendorHash = "";
+  vendorHash = "sha256-jMqPVvMZDm406Gi2g4zNSRJMySLAN7/CR/2NgF+gqtA=";
 
-  ldflags = ["-s" "-w"];
-}
+  ldflags = ["-s" "-w" "-X main.version=${finalAttrs.version}"];
+
+  # Copy web assets
+  postInstall = ''
+    mkdir -p $out/share/watchdog
+    cp -r $src/web $out/share/watchdog/
+  '';
+
+  meta = {
+    description = "Privacy-preserving web analytics with Prometheus-native metrics";
+    homepage = "https://github.com/notashelf/watchdog";
+    license = lib.licenses.gpl3Only;
+    maintainers = with lib.maintainers; [NotAShelf];
+    mainProgram = "watchdog";
+  };
+})