Reopen GUI window if launcher script is executed a second time.

[studersi]

If the GUI window is closed and the launcher script is executed a second time, a window is opened, but it doesn't connect to the firewall. It stays empty and the firewall rules can't be modified.

I implemented a solution where the script checks if the GUI application is already running. If so, a USR1 signal is sent to that process, telling it to reopen the closed window.

This solves my issue: #18

[studersi]

Added the shebang, so it merges without conflicts.

[themighty1]

So you have a situation where the GUI app is running and yet it has no systray icon?
What Linux flavor/desktop environment are you on?

[studersi]

Yes. I'm running Linux Mint 17.2 with Cinnamon.

When the GUI is launched at startup, the icon is not showing in the system tray.

I think this is due to a race condition. The system tray is probably not available when the GUI is launched. I found a more or less reliable solution to the problem, adding the following lines before the tray icon is created:

while not QSystemTrayIcon.isSystemTrayAvailable():
    time.sleep(1)

[studersi]

With this solution the initial problem still remains however. If for example a launcher for ./gui/gui.py is added to the application menu, it would open a new window that is empty (and a second tray icon) instead of reopening the one that was closed.

[licaon-kter]

This will fail with a custom pid file location.

[bash64]

In Linux Mint 17.3 Cinnamon 64 bit I avoid this by adding both lpfw and the gui to System Settings->Startup Applications. This causes lpfw and the gui to run everytime I login, however, on a cold boot I do get the Icon in the systray. I give lpfw a startup delay of 0 secs and the gui a delay of 5 secs. Doesn't seem to be effected by a logout/login.