bitbake: cooker: Ensure we handle inotify before running the next command

The inotify watch events are handled "at idle" which could in theory mean
a command could run before any preceeding inotify events have been processed.
This leads to a theoretical race window where those events may have a
signficicant effect on the command.

Add a mechanism to allow us to ensure all pending events are processed before
running commands.

(Bitbake rev: bf76cd7e5881adf264b8ba64e27a5b6ca9df4fde)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/bb/command.py

@@ -78,6 +78,7 @@ class Command:
                 if not hasattr(command_method, 'readonly') or False == getattr(command_method, 'readonly'):
                     return None, "Not able to execute not readonly commands in readonly mode"
             try:
+                self.cooker.process_inotify_updates()
                 if getattr(command_method, 'needconfig', False):
                     self.cooker.updateCacheSync()
                 result = command_method(self, commandline)
@@ -98,6 +99,7 @@ class Command:
 
     def runAsyncCommand(self):
         try:
+            self.cooker.process_inotify_updates()
             if self.cooker.state in (bb.cooker.state.error, bb.cooker.state.shutdown, bb.cooker.state.forceshutdown):
                 # updateCache will trigger a shutdown of the parser
                 # and then raise BBHandledException triggering an exit