Merge pull request PrismLauncher#1882 from bit69tream/notify-user-if-…

…tmp-is-noexec

launcher/Application.cpp

@@ -132,6 +132,15 @@
 #include "gamemode_client.h"
 #endif
 
+#if defined(Q_OS_LINUX)
+#include <sys/statvfs.h>
+#endif
+
+#if defined(Q_OS_FREEBSD) || defined(Q_OS_OPENBSD)
+#include <sys/mount.h>
+#include <sys/types.h>
+#endif
+
 #if defined(Q_OS_MAC)
 #if defined(SPARKLE_ENABLED)
 #include "updater/MacSparkleUpdater.h"
@@ -988,6 +997,37 @@ Application::Application(int& argc, char** argv) : QApplication(argc, argv)
         }
     }
 
+    // notify user if /tmp is mounted with `noexec` (#1693)
+    {
+        bool is_tmp_noexec = false;
+
+#if defined(Q_OS_LINUX)
+
+        struct statvfs tmp_stat;
+        statvfs("/tmp", &tmp_stat);
+        is_tmp_noexec = tmp_stat.f_flag & ST_NOEXEC;
+
+#elif defined(Q_OS_FREEBSD) || defined(Q_OS_OPENBSD)
+
+        struct statfs tmp_stat;
+        statfs("/tmp", &tmp_stat);
+        is_tmp_noexec = tmp_stat.f_flags & MNT_NOEXEC;
+
+#endif
+
+        if (is_tmp_noexec) {
+            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();
+        }
+    }
+
     if (createSetupWizard()) {
         return;
     }