bitbake: process/knotty: Improve early exception handling

The new server startup code means exceptions can happen when we aren't
setup to show them to the user correctly, leading to ugly tracebacks.

Add in some special case handling of BBHandledException to at least
ensure that common case doesn't traceback and the user sees meaningful
output.

In the future, the logging setup can likely be improved, as can the way
runCommand handles exceptions, they all should likely become real
exceptions again on the UI side.

[YOCTO #14022]
[YOCTO #14033]

(Bitbake rev: 6059d0e77f60ddb679049bd34478f41b1ab7995d)

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

bitbake/lib/bb/server/process.py

@@ -365,7 +365,12 @@ class ServerCommunicator():
             logger.info("No reply from server in 30s")
             if not self.recv.poll(30):
                 raise ProcessTimeout("Timeout while waiting for a reply from the bitbake server (60s)")
-        return self.recv.get()
+        ret, exc = self.recv.get()
+        # Should probably turn all exceptions in exc back into exceptions?
+        # For now, at least handle BBHandledException
+        if exc and "BBHandledException" in exc:
+            raise bb.BBHandledException()
+        return ret, exc
 
     def updateFeatureSet(self, featureset):
         _, error = self.runCommand(["setFeatures", featureset])

bitbake/lib/bb/ui/knotty.py

@@ -380,14 +380,27 @@ _evt_list = [ "bb.runqueue.runQueueExitWait", "bb.event.LogExecTTY", "logging.Lo
               "bb.event.BuildBase", "bb.build.TaskStarted", "bb.build.TaskSucceeded", "bb.build.TaskFailedSilent",
               "bb.build.TaskProgress", "bb.event.ProcessStarted", "bb.event.ProcessProgress", "bb.event.ProcessFinished"]
 
+def drain_events_errorhandling(eventHandler):
+    # We don't have logging setup, we do need to show any events we see before exiting
+    event = True
+    logger = bb.msg.logger_create('bitbake', sys.stdout)
+    while event:
+        event = eventHandler.waitEvent(0)
+        if isinstance(event, logging.LogRecord):
+            logger.handle(event)
+
 def main(server, eventHandler, params, tf = TerminalFilter):
 
-    if not params.observe_only:
-        params.updateToServer(server, os.environ.copy())
+    try:
+        if not params.observe_only:
+            params.updateToServer(server, os.environ.copy())
 
-    includelogs, loglines, consolelogfile, logconfigfile = _log_settings_from_server(server, params.observe_only)
+        includelogs, loglines, consolelogfile, logconfigfile = _log_settings_from_server(server, params.observe_only)
 
-    loglevel, _ = bb.msg.constructLogOptions()
+        loglevel, _ = bb.msg.constructLogOptions()
+    except bb.BBHandledException:
+        drain_events_errorhandling(eventHandler)
+        return 1
 
     if params.options.quiet == 0:
         console_loglevel = loglevel