fix: handle non-existent queue jobRunAsUser on worker host (#176)

Problem:
Worker crashed if trying to run as an non-valid user (or group)

Solution:
- Handle exceptions when trying to resolve the user's home directory.
- Fail the session action(s) with the error message amended to
  suggest the possibility of a non-existent user on the worker host.

Signed-off-by: Matt Authement <[email protected]>

src/deadline_worker_agent/scheduler/scheduler.py

@@ -23,7 +23,6 @@
 from openjd.sessions import ActionState, ActionStatus
 from deadline.job_attachments.asset_sync import AssetSync
 
-
 from ..aws.deadline import update_worker
 from ..aws_credentials import QueueBoto3Session, AwsCredentialsRefresher
 from ..boto import DeadlineClient, Session as BotoSession
@@ -714,13 +713,17 @@ def _create_new_sessions(
                         new_session_id,
                         os_user,
                     )
-                except (DeadlineRequestWorkerOfflineError, DeadlineRequestUnrecoverableError) as e:
+                except (
+                    DeadlineRequestWorkerOfflineError,
+                    DeadlineRequestUnrecoverableError,
+                    RuntimeError,
+                ) as e:
                     # Terminal error. We need to fail the Session.
-                    message = (
-                        "Unrecoverable error trying to obtain AWS Credentials for the Queue Role."
-                    )
+                    message = f"Unrecoverable error trying to obtain AWS Credentials for the Queue Role: {e}"
+                    if str(e).startswith("Can't determine home directory"):
+                        message += ". Possible non-valid username."
                     self._fail_all_actions(session_spec, message)
-                    logger.warning("[%s] %s: %s", new_session_id, message, str(e))
+                    logger.warning("[%s] %s", new_session_id, message)
                     # Force an immediate UpdateWorkerSchedule request
                     self._wakeup.set()
                     continue