Implementation of "migration manager" to fix placement of config files issue appeared after moving from Qt 5 to Qt 6

client/migrations.cpp

@@ -0,0 +1,86 @@
+#include "migrations.h"
+
+#include <QDebug>
+#include <QDir>
+#include <QFile>
+#include <QStandardPaths>
+
+#include "defines.h"
+
+Migrations::Migrations(QObject *parent)
+    : QObject{parent}
+{
+    QString version(APP_MAJOR_VERSION);
+
+    QStringList versionDigits = version.split(".");
+
+    if (versionDigits.size() >= 3) {
+        currentMajor = versionDigits[0].toInt();
+        currentMinor = versionDigits[1].toInt();
+        currentMicro = versionDigits[2].toInt();
+    }
+
+    if (versionDigits.size() == 4) {
+        currentPatch = versionDigits[3].toInt();
+    }
+}
+
+void Migrations::doMigrations()
+{
+    if (currentMajor == 3) {
+        migrateV3();
+    }
+}
+
+void Migrations::migrateV3()
+{
+#ifdef Q_OS_ANDROID
+    qDebug() << "Migration to V3 on Android...";
+
+    QString packageName = "org.amnezia.vpn";
+
+    QDir dir(".");
+    QString currentDir = dir.absolutePath();
+
+    int packageNameIndex = currentDir.indexOf(packageName);
+
+    if (packageNameIndex == -1) {
+        return;
+    }
+
+    QString rootLocation = currentDir.left(packageNameIndex + packageName.size());
+
+    if (rootLocation.isEmpty()) {
+        return;
+    }
+
+    QString location = rootLocation + "/files/.config/AmneziaVPN.ORG/AmneziaVPN.conf";
+
+    QFile oldConfig(location);
+
+    if (oldConfig.exists()) {
+        QString newConfigPath = rootLocation + "/files/settings";
+
+        QDir newConfigDir(newConfigPath);
+
+        newConfigPath += "/AmneziaVPN.ORG";
+
+        bool mkPathRes = newConfigDir.mkpath(newConfigPath);
+
+        if (!mkPathRes) {
+            return;
+        }
+
+        QFile newConfigFile(newConfigPath + "/AmneziaVPN.conf");
+
+        if (!newConfigFile.exists()) {
+            bool cpResult = QFile::copy(oldConfig.fileName(), newConfigFile.fileName());
+            if (cpResult) {
+                oldConfig.remove();
+                QDir oldConfigDir(rootLocation + "/files/.config");
+                oldConfigDir.rmdir("AmneziaVPN.ORG");
+            }
+        }
+    }
+#endif
+}