From 304d84326796730a8dac1f56e1f2962e4747ce63 Mon Sep 17 00:00:00 2001
From: Alexander Babikov <lemondrops358@gmail.com>
Date: Thu, 8 Jan 2026 14:36:24 +0500
Subject: [PATCH] Manager: Don't allow changing the system directory when
 machines are running

---
 src/qt/qt_vmmanager_mainwindow.cpp  | 3 ++-
 src/qt/qt_vmmanager_preferences.cpp | 8 +++++++-
 src/qt/qt_vmmanager_preferences.hpp | 2 +-
 3 files changed, 10 insertions(+), 3 deletions(-)

diff --git a/src/qt/qt_vmmanager_mainwindow.cpp b/src/qt/qt_vmmanager_mainwindow.cpp
index 3418519e5..2155799f5 100644
--- a/src/qt/qt_vmmanager_mainwindow.cpp
+++ b/src/qt/qt_vmmanager_mainwindow.cpp
@@ -202,7 +202,8 @@ VMManagerMainWindow::vmmStateChanged(const VMManagerSystem *sysconfig) const
 void
 VMManagerMainWindow::preferencesTriggered()
 {
-    const auto prefs = new VMManagerPreferences();
+    bool machinesRunning = (vmm->getActiveMachineCount() > 0);
+    const auto prefs = new VMManagerPreferences(this, machinesRunning);
     if (prefs->exec() == QDialog::Accepted) {
         emit preferencesUpdated();
         updateLanguage();
diff --git a/src/qt/qt_vmmanager_preferences.cpp b/src/qt/qt_vmmanager_preferences.cpp
index 2de133254..77d5d1657 100644
--- a/src/qt/qt_vmmanager_preferences.cpp
+++ b/src/qt/qt_vmmanager_preferences.cpp
@@ -33,7 +33,7 @@ extern "C" {
 }
 
 VMManagerPreferences::
-    VMManagerPreferences(QWidget *parent)
+    VMManagerPreferences(QWidget *parent, bool machinesRunning)
     : ui(new Ui::VMManagerPreferences)
 {
     ui->setupUi(this);
@@ -50,6 +50,12 @@ VMManagerPreferences::
         ui->systemDirectory->setText(QDir::toNativeSeparators(QDir(vmm_path).path()));
     }
 
+    if (machinesRunning) {
+        ui->systemDirectory->setEnabled(false);
+        ui->dirSelectButton->setEnabled(false);
+        ui->dirSelectButton->setToolTip(tr("To change the system directory, stop all running machines."));
+    }
+
     ui->comboBoxLanguage->setItemData(0, 0);
     for (int i = 1; i < ProgSettings::languages.length(); i++) {
         ui->comboBoxLanguage->addItem(ProgSettings::languages[i].second, i);
diff --git a/src/qt/qt_vmmanager_preferences.hpp b/src/qt/qt_vmmanager_preferences.hpp
index 4215eb768..1ddeedb51 100644
--- a/src/qt/qt_vmmanager_preferences.hpp
+++ b/src/qt/qt_vmmanager_preferences.hpp
@@ -26,7 +26,7 @@ QT_END_NAMESPACE
 class VMManagerPreferences final : public QDialog {
     Q_OBJECT
 public:
-    explicit VMManagerPreferences(QWidget *parent = nullptr);
+    explicit VMManagerPreferences(QWidget *parent = nullptr, bool machinesRunning = false);
     ~VMManagerPreferences() override;
 
 private: