From 681e76c551df3e1c9daf07d0b8075d2cca77c832 Mon Sep 17 00:00:00 2001
From: bit6tream <megapixel483@gmail.com>
Date: Wed, 22 Nov 2023 01:48:31 +0300
Subject: [PATCH] (#1693) Notify user if /tmp directory has `noexec` mount
 option

Minecraft versions starting from 1.19 would not start at all if /tmp is mounted as `noexec`.

Signed-off-by: bit6tream <megapixel483@gmail.com>
---
 launcher/Application.cpp | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

diff --git a/launcher/Application.cpp b/launcher/Application.cpp
index be252f1c5..619215162 100644
--- a/launcher/Application.cpp
+++ b/launcher/Application.cpp
@@ -82,6 +82,7 @@
 
 #include <iostream>
 #include <mutex>
+#include <string_view>
 
 #include <QAccessible>
 #include <QCommandLineParser>
@@ -132,6 +133,10 @@
 #include "gamemode_client.h"
 #endif
 
+#if defined(Q_OS_LINUX) || defined(Q_OS_FREEBSD) || defined(Q_OS_OPENBSD)
+#include <mntent.h>
+#endif
+
 #if defined(Q_OS_MAC)
 #if defined(SPARKLE_ENABLED)
 #include "updater/MacSparkleUpdater.h"
@@ -988,6 +993,36 @@ Application::Application(int& argc, char** argv) : QApplication(argc, argv)
         }
     }
 
+#if defined(Q_OS_LINUX) || defined(Q_OS_FREEBSD) || defined(Q_OS_OPENBSD)
+
+    // notify user if /tmp is mounted with `noexec` (#1693)
+    {
+        FILE* description = setmntent(MOUNTED, "r");
+        mntent* info = nullptr;
+
+        while ((info = getmntent(description)) != nullptr) {
+            std::string_view directory = info->mnt_dir;
+            std::string_view options = info->mnt_opts;
+
+            if (directory == "/tmp" && options.rfind("noexec") != std::string_view::npos) {
+                auto infoMsg =
+                    tr("Your /tmp directory is currently mounted with the 'noexec' flag enabled.\n"
+                       "Some versions of Minecraft may not launch.\n");
+                auto msgBox = new QMessageBox(QMessageBox::Information, tr("Incompatible system configuration"), infoMsg, QMessageBox::Ok);
+                msgBox->setDefaultButton(QMessageBox::Ok);
+                msgBox->setAttribute(Qt::WA_DeleteOnClose);
+                msgBox->setMinimumWidth(460);
+                msgBox->adjustSize();
+                msgBox->open();
+                break;
+            }
+        }
+
+        endmntent(description);
+    }
+
+#endif
+
     if (createSetupWizard()) {
         return;
     }