#1065 linux: add systray icon

Adds a systray icon for linux mode. Uses pystray module. Expects a
favicon.ico stored in the same folder as the main ogclient python
script, but if not found a placeholder image is used.

src/linux/ogOperations.py

@@ -7,18 +7,70 @@
 # (at your option) any later version.
 
 import os
+from pystray import Icon, Menu, MenuItem
+import multiprocessing as mp
+from multiprocessing import Process
+from PIL import Image, ImageDraw
+
 from src.ogRest import ThreadState
 
 
+def _create_default_image():
+    """
+    Creates a default image for the tray icon. Use in case
+    no favicon.ico is found.
+    """
+    width = height = 250
+    color1 = (255, 255, 255)
+    color2 = (255, 0, 255)
+
+    image = Image.new('RGB', (width, height), color1)
+    dc = ImageDraw.Draw(image)
+    dc.rectangle(
+        (width // 2, 0, width, height // 2),
+        fill=color2)
+    dc.rectangle(
+        (0, height // 2, width // 2, height),
+        fill=color2)
+
+    return image
+
+
+def create_image():
+    try:
+        image = Image.open(r'./favicon.ico')
+        image = Image.composite(image, Image.new('RGB', image.size, 'white'), image)
+    except:
+        image = _create_default_image()
+    return image
+
+
+def create_systray():
+    menu = Menu(MenuItem('Powered by Soleta Networks!',
+                         lambda icon, item: 1))
+    icon = Icon('ogClient', create_image(), menu=menu)
+    assert icon.icon
+    icon.run()
+
+
+systray_p = Process(target=create_systray)
+
+
 class OgLinuxOperations:
 
+    def __init__(self):
+        mp.set_start_method('spawn')
+        systray_p.start()
+
     def _restartBrowser(self, url):
         raise NotImplementedError
 
     def poweroff(self):
+        systray_p.terminate()
         os.system('systemctl poweroff')
 
     def reboot(self):
+        systray_p.terminate()
         os.system('systemctl reboot')
 
     def shellrun(self, request, ogRest):