nexusmods-app.updateScript: check if package was updated

Before updating `games.json` and the game hashes DB, check if the main
package version was actually changed.

pkgs/by-name/ne/nexusmods-app/update.sh

@@ -10,15 +10,28 @@ self=$(realpath "$0")
 dir=$(dirname "$self")
 cd "$dir"/../../../../
 
-# Update vendored files
-"$dir"/vendored/update.sh
-
-# Update game_hashes_db
-UPDATE_NIX_ATTR_PATH="$UPDATE_NIX_ATTR_PATH.gameHashes" \
-  "$dir"/game-hashes/update.sh
+current_version=$(
+  nix-instantiate --eval --raw \
+    --attr "$UPDATE_NIX_ATTR_PATH.version"
+)
 
 url=$(
   nix-instantiate --eval --raw \
     --attr "$UPDATE_NIX_ATTR_PATH.meta.homepage"
 )
+
 nix-update --url "$url"
+
+new_version=$(
+  nix-instantiate --eval --raw \
+    --attr "$UPDATE_NIX_ATTR_PATH.version"
+)
+
+if [ "$current_version" != "$new_version" ]; then
+  # Update vendored files
+  "$dir"/vendored/update.sh
+
+  # Update game_hashes_db
+  UPDATE_NIX_ATTR_PATH="$UPDATE_NIX_ATTR_PATH.gameHashes" \
+    "$dir"/game-hashes/update.sh
+fi