From c6f3e645f45c2f97634481e3b41428b98aeb637f Mon Sep 17 00:00:00 2001
From: Marco Allegretti <mightymarco4@gmail.com>
Date: Fri, 13 Feb 2026 13:06:19 +0100
Subject: [PATCH] app: save library.json atomically

---
 src/app.cpp | 20 +++++++++++++++++---
 1 file changed, 17 insertions(+), 3 deletions(-)

diff --git a/src/app.cpp b/src/app.cpp
index b9c771b..fff446d 100644
--- a/src/app.cpp
+++ b/src/app.cpp
@@ -18,6 +18,7 @@
 #include <QJsonDocument>
 #include <QJsonObject>
 #include <QJsonParseError>
+#include <QSaveFile>
 #include <QStandardPaths>
 #include <QtConcurrent>
 
@@ -936,10 +937,14 @@ void App::saveLibrary()
     QString dataPath = QStandardPaths::writableLocation(QStandardPaths::AppDataLocation);
     QDir dir(dataPath);
     if (!dir.exists()) {
-        dir.mkpath(dataPath);
+        if (!dir.mkpath(dataPath)) {
+            qWarning() << "Failed to create data directory:" << dataPath;
+            return;
+        }
     }
 
-    QFile file(dataPath + QStringLiteral("/library.json"));
+    const QString libraryPath = dataPath + QStringLiteral("/library.json");
+    QSaveFile file(libraryPath);
     if (!file.open(QIODevice::WriteOnly)) {
         qWarning() << "Failed to save library:" << file.errorString();
         return;
@@ -954,7 +959,16 @@ void App::saveLibrary()
     }
 
     QJsonDocument doc(gamesArray);
-    file.write(doc.toJson());
+    const QByteArray payload = doc.toJson();
+    if (file.write(payload) != payload.size()) {
+        qWarning() << "Failed to save library:" << file.errorString();
+        return;
+    }
+
+    if (!file.commit()) {
+        qWarning() << "Failed to save library:" << file.errorString();
+        return;
+    }
 }
 
 void App::loadLibrary()