Add rpcs3 location checks to main

Don't allow running RPCS3 from temp dirs.
Abort if the folder has no write permissions.

rpcs3/main.cpp

@@ -18,6 +18,7 @@
 #include <QJsonDocument>
 #include <QMessageBox>
 #include <QMetaEnum>
+#include <QStandardPaths>
 
 #include "rpcs3qt/gui_application.h"
 #include "rpcs3qt/fatal_error_dialog.h"
@@ -97,7 +98,7 @@ LOG_CHANNEL(q_debug, "QDEBUG");
 		buf = std::string(_text);
 
 		// Always print thread id
-		fmt::append(buf, "\nThread id = %s.", std::this_thread::get_id());
+		fmt::append(buf, "\n\nThread id = %s.", std::this_thread::get_id());
 	}
 
 	std::string_view text = buf.empty() ? _text : buf;
@@ -258,6 +259,7 @@ constexpr auto arg_installpkg   = "installpkg";
 constexpr auto arg_commit_db    = "get-commit-db";
 constexpr auto arg_timer        = "high-res-timer";
 constexpr auto arg_verbose_curl = "verbose-curl";
+constexpr auto arg_any_location = "allow-any-location";
 
 int find_arg(std::string arg, int& argc, char* argv[])
 {
@@ -591,6 +593,7 @@ int main(int argc, char** argv)
 	parser.addOption(QCommandLineOption(arg_commit_db, "Update commits.lst cache. Optional arguments: <path> <sha>"));
 	parser.addOption(QCommandLineOption(arg_timer, "Enable high resolution timer for better performance (windows)", "enabled", "1"));
 	parser.addOption(QCommandLineOption(arg_verbose_curl, "Enable verbose curl logging."));
+	parser.addOption(QCommandLineOption(arg_any_location, "Allow RPCS3 to be run from any location. Dangerous"));
 	parser.process(app->arguments());
 
 	// Don't start up the full rpcs3 gui if we just want the version or help.
@@ -901,6 +904,42 @@ int main(int argc, char** argv)
 		report_fatal_error("RPCS3 initialization failed!");
 	}
 
+	// Check if the current location is actually useable
+	if (!parser.isSet(arg_any_location))
+	{
+		const std::string emu_dir = rpcs3::utils::get_emu_dir();
+
+		// Check temporary directories
+		for (const QString& path : QStandardPaths::standardLocations(QStandardPaths::StandardLocation::TempLocation))
+		{
+			if (Emu.IsPathInsideDir(emu_dir, path.toStdString()))
+			{
+				report_fatal_error(fmt::format(
+					"RPCS3 should never be run from a temporary location!\n"
+					"Please install RPCS3 in a persistent location.\n"
+					"Current location:\n%s", emu_dir));
+				return 1;
+			}
+		}
+
+		// Check if the directory is writable
+		fs::stat_t info{};
+		if (!fs::stat(emu_dir, info))
+		{
+			report_fatal_error(fmt::format("Unable to query folder stats. Error: %s\nCurrent location:\n%s", fs::g_tls_error, emu_dir));
+			return 1;
+		}
+
+		if (!info.is_writable)
+		{
+			report_fatal_error(fmt::format(
+				"The RPCS3 folder has no write permissions!\n"
+				"Please make sure that the current user has write permissions.\n"
+				"Current location:\n%s", emu_dir));
+			return 1;
+		}
+	}
+
 #ifdef _WIN32
 	// Create dummy permanent low resolution timer to workaround messing with system timer resolution
 	QTimer* dummy_timer = new QTimer(app.data());