Make appcontroller a temporary daemon

For a restart being successful the application has to be shut down with out
terminating the appcontroller. Afterwards the appcontroller will be able to
start the application again.

Change-Id: I38fd0aded176a10dac40c419b6866ce70ec1fcef
Reviewed-by: Laszlo Agocs <[email protected]>

Author: Rainer Keller

main.cpp

@@ -55,14 +55,15 @@ static void usage()
            "--debug-gdb          Start GDB debugging\n"
            "--debug-qml          Start QML debugging\n"
            "--stop               Stop already running application\n"
+           "--stop-for-restart   Stop already running application and prepare to restart it\n"
            "--launch             Start application without stopping already running application\n"
            "--show-platform      Show platform information\n"
            "--make-default       Make this application the default on boot\n"
            "--remove-default     Restore the default application\n"
            "--print-debug        Print debug messages to stdout on Android\n"
            "--version            Print version information\n"
            "--detach             Start application as usual, then go into background\n"
-           "--restart            Restart the current running application\n"
+           "--restart            Restart the current running application or an application stopped with --stop-for-restart\n"
            "--help, -h, -help    Show this help\n"
           );
 }
@@ -164,6 +165,11 @@ static void restart()
     connectSocket("restart");
 }
 
+static void stopForRestart()
+{
+    connectSocket("stopForRestart");
+}
+
 static int openServer(QTcpServer *s, Utils::PortList &range)
 {
     while (range.hasMore()) {
@@ -375,6 +381,9 @@ int main(int argc, char **argv)
         } else if (arg == "--restart") {
             restart();
             return 0;
+        } else if (arg == "--stop-for-restart") {
+            stopForRestart();
+            return 0;
         } else if (arg == "--help" || arg == "-help" || arg == "-h") {
             usage();
             return 0;

process.cpp

@@ -259,7 +259,8 @@ void Process::stop()
 {
     if (mProcess->state() == QProcess::QProcess::NotRunning) {
         printf("No process running\n");
-        qApp->exit();
+        if (!mBeingRestarted)
+            qApp->exit();
         return;
     }
 
@@ -276,6 +277,13 @@ void Process::stop()
         mProcess->kill();
 }
 
+void Process::stopForRestart()
+{
+    printf("Stopping application for restart\n");
+    mBeingRestarted = true;
+    stop();
+}
+
 void Process::restart()
 {
     printf("Restarting application\n");
@@ -313,6 +321,8 @@ void Process::incomingConnection(int i)
         stop();
     else if (command == "restart")
         restart();
+    else if (command == "stopForRestart")
+        stopForRestart();
     else
         stop();
 }

process.h

@@ -60,6 +60,7 @@ class Process : public QObject
     void setStdoutFd(qintptr stdoutFd);
 public slots:
     void stop();
+    void stopForRestart();
     void restart();
 private slots:
     void readyReadStandardError();