Add --no-respawn (-n) option to plasma-shell

Disables automatic restarting of plasma-shell, useful for debugging
purposes.

BUG:332515

src/shell/main.cpp

@@ -57,6 +57,10 @@ int main(int argc, char** argv)
                            QStringLiteral("windowed"),
                            QStringLiteral("Force a windowed view for testing purposes"));
 
+    QCommandLineOption respawn(QStringList() << QStringLiteral("n") <<
+                           QStringLiteral("no-respawn"),
+                           QStringLiteral("Do not restart plasma-shell automatically after a crash"));
+
     QCommandLineOption crash(QStringList() << QStringLiteral("c") << QStringLiteral("crashes"),
                                      QStringLiteral("Recent number of crashes"),
                                      QStringLiteral("n"));
@@ -68,6 +72,7 @@ int main(int argc, char** argv)
     parser.addHelpOption();
     parser.addOption(dbg);
     parser.addOption(win);
+    parser.addOption(respawn);
     parser.addOption(crash);
     parser.addOption(shutup);
 
@@ -80,6 +85,7 @@ int main(int argc, char** argv)
 
     ShellManager::setCrashCount(parser.value(crash).toInt());
     ShellManager::s_forceWindowed = parser.isSet(win);
+    ShellManager::s_noRespawn = parser.isSet(respawn);
     ShellManager::instance();
 
     return app.exec();

src/shell/shellmanager.cpp

@@ -41,6 +41,7 @@ static const QString s_shellsDir = QString(QStandardPaths::locate(QStandardPaths
 static const QString s_shellLoaderPath = QString("/contents/loader.qml");
 
 bool ShellManager::s_forceWindowed = false;
+bool ShellManager::s_noRespawn = false;
 
 int ShellManager::crashes = 0;
 
@@ -242,11 +243,11 @@ void ShellManager::crashHandler(int signal)
     sprintf(cmd, "%s --crashes %d &",
             QFile::encodeName(QCoreApplication::applicationFilePath()).constData(), crashes);
 
-    if (crashes < 3) {
+    if (crashes < 3 && !s_noRespawn) {
         sleep(1);
         system(cmd);
     } else {
-        fprintf(stderr, "Too many crashes in short order, not restarting automatically.\n");
+        fprintf(stderr, "Too many crashes in short order or respawning disabled, not restarting automatically.\n");
     }
 
 }

src/shell/shellmanager.h

@@ -41,6 +41,7 @@ public:
     void loadHandlers();
 
     static bool s_forceWindowed;
+    static bool s_noRespawn;
 
     static void setCrashCount(int count);