backup driver cannot instantiate

[Lisa Li]

When backup_swift_url is not set, backup driver can't be initialized. But backup service stays alive, we can create a backup which goes into error state. But later the backup can't be deleted.

[Ivan Kolodyazhny (e0ne)]

This bug is reproducible on current master. The root cause is: we don't have 'initialization' feature for backup drivers like we have for volume drivers. So similar issues could be found in other backup drivers too.

I'll create a blueprint [1] for this initiative and will propose a spec for Ocata.

[1] https://blueprints.launchpad.net/cinder/+spec/backup-init

[Michael Dovgal (mdovgal)]

Update:
This bug for swift is reproducible only at that situation, when we have c-bak service that is started, but we don't have any backend configured for it (nor in config options neither s-services started for keystone to know something about it).
On delete it is broken here [0]

[0] - https://github.com/openstack/cinder/blob/101dcc6ccafeaa317ec5131570e8e65c9505cfc8/cinder/backup/drivers/swift.py#L179

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/446518

[Sean McGinnis (sean-mcginnis)]

https://review.openstack.org/#/c/446518/ merged