When attempting to reset lost uploads multiple launchers could race
trying to update the same upload. In addition this could also happen
when the cache is not fully up-to-date.
Instead of causing an error in the main thread, we can catch and ignore
the exception in case we did not get the lock.
ERROR zuul.Launcher: Error in main thread:
Traceback (most recent call last):
File "/opt/zuul/lib/python3.11/site-packages/zuul/launcher/server.py", line 955, in run
self._run()
File "/opt/zuul/lib/python3.11/site-packages/zuul/launcher/server.py", line 972, in _run
self.checkMissingUploads()
File "/opt/zuul/lib/python3.11/site-packages/zuul/launcher/server.py", line 1967, in checkMissingUploads
with (upload.locked(ctx, blocking=False),
File "/usr/local/lib/python3.11/contextlib.py", line 137, in __enter__
return next(self.gen)
^^^^^^^^^^^^^^
File "/opt/zuul/lib/python3.11/site-packages/zuul/zk/zkobject.py", line 575, in locked
raise LockException(f"Failed to acquire lock on {self}")
zuul.zk.exceptions.LockException: Failed to acquire lock on ...
Change-Id: Ibdd75db1aa52be0da2beed681b597b73c9a205bb
a846b257c9