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Hi Cinder experts,

Currently Glance has cinder backend but it is broken for a long time.
I am proposing a glance-spec/patch to fix it by implementing the
uploading/downloading images to/from cinder volumes.

Glance-spec: https://review.openstack.org/#/c/183363/
Glance_store patch: https://review.openstack.org/#/c/166414/

This will be also useful for sharing volume data among tenants (similar
use-case with public snapshots proposal discussed at the design summit).


I need a review for them from cinder developers to make it progress.



The main part of the patch is in cinder.py. It implements 3 methods get(),
add(), and delete() methods, using cinderclient and os-brick.
 - get() will attach a specified cinder volume to glance node, read the
data from it, then detach it.
 - add() will create a new volume, attach it to the glance node to write
image data to it, then detach it.
 - delete() will delete the specified volume.
The image volume will placed in the tenant specified
cinder_store_tenant_name, or current user's tenant if
cinder_store_tenant_name is not set.


Any comments are much appreciated, thanks.

Regards,
Tomoki Sekiyama