build: Tweak exception handling for setscene tasks

If an unexpected exception occurs in a setscene task, it is currently hidden
from the user and not recorded in any logs. This isn't helpful to debug
such failures.

Change the code so that even in the "silent" or "quiet" task case (setscene
tasks), a warning is shown with the traceback unless it was an "handled"
exception. This means the failing function can show it's own warning/error
instead if it wants to and then raise a handled event.

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

1 files changed, 9 insertions, 5 deletions

diff --git a/lib/bb/build.py b/lib/bb/build.py
index d6418e40b..65b7fc000 100644
--- a/lib/bb/build.py
+++ b/lib/bb/build.py
@@ -714,19 +714,23 @@ def _exec_task(fn, task, d, quieterr):
                 logger.debug2("Zero size logfn %s, removing", logfn)
                 bb.utils.remove(logfn)
                 bb.utils.remove(loglink)
-    except bb.BBHandledException:
-        event.fire(TaskFailed(task, fn, logfn, localdata, True), localdata)
-        return 1
     except (Exception, SystemExit) as exc:
+        handled = False
+        if isinstance(exc, bb.BBHandledException):
+            handled = True
+
         if quieterr:
+            if not handled:
+                logger.warning(repr(exc))
             event.fire(TaskFailedSilent(task, fn, logfn, localdata), localdata)
         else:
             errprinted = errchk.triggered
             # If the output is already on stdout, we've printed the information in the
             # logs once already so don't duplicate
-            if verboseStdoutLogging:
+            if verboseStdoutLogging or handled:
                 errprinted = True
-            logger.error(repr(exc))
+            if not handled:
+                logger.error(repr(exc))
             event.fire(TaskFailed(task, fn, logfn, localdata, errprinted), localdata)
         return 1