Support postprocessing in OSS-Fuzz (#4388)

Author: jonathanmetzman

src/clusterfuzz/_internal/base/tasks/__init__.py

@@ -281,7 +281,8 @@ def is_done_collecting_messages():
 def get_postprocess_task():
   """Gets a postprocess task if one exists."""
   # This should only be run on non-preemptible bots.
-  if not task_utils.is_remotely_executing_utasks():
+  if not (task_utils.is_remotely_executing_utasks() or
+          task_utils.get_opted_in_tasks()):
     return None
   # Postprocess is platform-agnostic, so we run all such tasks on our
   # most generic and plentiful bots only. In other words, we avoid

src/clusterfuzz/_internal/base/tasks/task_utils.py

@@ -37,12 +37,16 @@ def is_remotely_executing_utasks(task=None) -> bool:
   return is_task_opted_into_uworker_execution(task)
 
 
+def get_opted_in_tasks():
+  return local_config.ProjectConfig().get('uworker_tasks', [])
+
+
 def is_task_opted_into_uworker_execution(task):
   # TODO(metzman): Remove this after OSS-Fuzz and Chrome are at parity.
-  uworker_tasks = local_config.ProjectConfig().get('uworker_tasks', [])
   if 'skia' not in environment.get_value('JOB_NAME', ''):
     # This is just for testing OSS-Fuzz.
     return False
+  uworker_tasks = get_opted_in_tasks()
   return task in uworker_tasks