From 4d9c1db885bd3ab230440b25e70dcd8049cf4650 Mon Sep 17 00:00:00 2001
From: LostDragonist <lost.dragonist@gmail.com>
Date: Wed, 11 Sep 2019 11:45:32 -0500
Subject: Add portable lock feature

If the file "portable.txt" is present in the application directory,
MO will force itself to be launched as a portable instance.  The
change game button and menu item are hidden to prevent the user
from changing out of the portable instance.
---
 src/instancemanager.cpp | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

(limited to 'src/instancemanager.cpp')

diff --git a/src/instancemanager.cpp b/src/instancemanager.cpp
index fdc30e22..c0d343de 100644
--- a/src/instancemanager.cpp
+++ b/src/instancemanager.cpp
@@ -186,6 +186,10 @@ QString InstanceManager::queryInstanceName(const QStringList &instanceList) cons
 
 QString InstanceManager::chooseInstance(const QStringList &instanceList) const
 {
+  if (portableInstallIsLocked()) {
+    return QString();
+  }
+
   enum class Special : uint8_t {
     NewInstance,
     Portable,
@@ -266,6 +270,19 @@ bool InstanceManager::portableInstall() const
 }
 
 
+bool InstanceManager::portableInstallIsLocked() const
+{
+  return QFile::exists(qApp->applicationDirPath() + "/" +
+                       QString::fromStdWString(AppConfig::portableLockFileName()));
+}
+
+
+bool InstanceManager::allowedToChangeInstance() const
+{
+  return !portableInstallIsLocked();
+}
+
+
 void InstanceManager::createDataPath(const QString &dataPath) const
 {
   if (!QDir(dataPath).exists()) {
@@ -286,6 +303,10 @@ void InstanceManager::createDataPath(const QString &dataPath) const
 QString InstanceManager::determineDataPath()
 {
   QString instanceId = currentInstance();
+  if (portableInstallIsLocked()) 
+  {
+    instanceId.clear();
+  }
   if (instanceId.isEmpty() && !m_Reset && (m_overrideInstance || portableInstall()))
   {
     // startup, apparently using portable mode before
-- 
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