Refactored service boot delay for enabling power button

The issue with the previous implementation was that firstly on an
exception execution continued and secondly that it would disable
the button when Dashboard was not running. This approach delays
enabling the button for 20 sec after service starts.

kano_peripherals/ck2_pro_hat/driver/service.py

@@ -190,23 +190,14 @@ def _launch_shutdown_menu():
             if not is_enabled.value:
                 return
 
-
-            #
             # FIXME: The problem: The poppa menu eventually pops up on a naked PI
             # with no powerhat board connected, right in the middle of Dashboard loading up,
             # grabbing user input and consequently blocking the user completely.
             # Solution: prevent the poppa menu from appearing if the Dashboard
             # has not been running for long enough.
-            #
-            dashboard_up_seconds=20
-            try:
-                dashboard_times=os.popen('ps -p $(pidof kano-dashboard) -o etimes=').read().strip()
-                if (not dashboard_times.startswith('error') and int(dashboard_times) < dashboard_up_seconds):
-                    # The dashboard is loading up, do not popup the menu now, discard event
-                    return
-            except:
-                pass
 
+            if time.time() - startup_timestamp < 20:
+                return
 
             # TODO: The env vars bellow are a workaround the fact that Qt5 apps are
             #   stacking on top of each other creating multiple mice, events propagating
@@ -219,6 +210,8 @@ def _launch_shutdown_menu():
                 ' /usr/bin/shutdown-menu'
             )
 
+        startup_timestamp = time.time()
+
         kano_hat = CK2ProHat()
         kano_hat.initialise()
 

kano_peripherals/pi_hat/driver/service.py

@@ -338,23 +338,14 @@ def _launch_shutdown_menu():
             if not is_enabled.value:
                 return
 
-
-            #
             # FIXME: The problem: The poppa menu eventually pops up on a naked PI
             # with no pihat board connected, right in the middle of Dashboard loading up,
             # grabbing user input and consequently blocking the user completely.
             # Solution: prevent the poppa menu from appearing if the Dashboard
             # has not been running for long enough.
-            #
-            dashboard_up_seconds=20
-            try:
-                dashboard_times=os.popen('ps -p $(pidof kano-dashboard) -o etimes=').read().strip()
-                if (not dashboard_times.startswith('error') and int(dashboard_times) < dashboard_up_seconds):
-                    # The dashboard is loading up, do not popup the menu now, discard event
-                    return
-            except:
-                pass
 
+            if time.time() - startup_timestamp < 20:
+                return
 
             # TODO: The env vars bellow are a workaround the fact that Qt5 apps are
             #   stacking on top of each other creating multiple mice, events propagating
@@ -367,6 +358,8 @@ def _launch_shutdown_menu():
                 ' /usr/bin/shutdown-menu'
             )
 
+        startup_timestamp = time.time()
+
         kano_hat = KanoHat()
         kano_hat.initialise()