Arvados

Seen this a few times:

2020-08-17T18:00:02.957407737Z   File "/usr/bin/arv-mount", line 10, in <module>
2020-08-17T18:00:02.957407737Z     arvados_fuse.command.Mount(args).run()
2020-08-17T18:00:02.957407737Z   File "/usr/share/python2.7/dist/python-arvados-fuse/lib/python2.7/site-packages/arvados_fuse/command.py", line 171, in run
2020-08-17T18:00:02.957491091Z     recursive=self.args.unmount_all)
2020-08-17T18:00:02.957491091Z   File "/usr/share/python2.7/dist/python-arvados-fuse/lib/python2.7/site-packages/arvados_fuse/unmount.py", line 161, in unmount
2020-08-17T18:00:02.957491091Z     sys.stderr.write(fusermount_output)
2020-08-17T18:00:02.957491091Z NameError: global name 'sys' is not defined