glance v1 and v2 image-show api are not compatible

[YaoZheng_ZTE]

The V1 image-show interface returns the following format：
<Image {u'status': u'active', u'name': u'test_ks_instance_snapshot', u'deleted': False, u'created_at': u'2016-03-23T02:45:48', u'updated_at': u'2016-03-23T02:45:48', u'id': u'79d3f61c-42dd-46e1-93b8-a15abbabac14', u'min_disk': 0, u'protected': False, u'min_ram': 0, u'owner': u'2c0303c32fc048b694f61266107a2ecb', u'is_public': False, 'properties': {u'block_device_mapping': u'[{"guest_format": null, "boot_index": 0, "no_device": null, "snapshot_id": "fa069837-0e2a-4e02-99ec-33d7cc56c2b8", "delete_on_termination": null, "disk_bus": "virtio", "image_id": null, "source_type": "snapshot", "device_type": "disk", "volume_id": null, "destination_type": "volume", "volume_size": null}]', u'checksum': u'd651988efba567833ef9ae57082b4495', u'min_ram': u'0', u'disk_format': u'qcow2', u'image_name': u'cirros', u'bdm_v2': u'True', u'image_id': u'c825e5ba-4a64-4e30-87ab-b8742c8b2121', u'root_device_name': u'/dev/vda', u'container_format': u'bare', u'min_disk': u'0', u'size': u'15400960'}, u'size': 0}>

The V2 image-show interface returns the following format：
{u'status': u'active', u'tags': [], u'container_format': None, u'min_ram': 0, u'updated_at': u'2016-05-10T11:17:10Z', u'visibility': u'private', u'image_name': u'test_cirros', u'image_id': u'498cc673-7c95-4883-9df7-6850deb8168f', u'file': u'/v2/images/c6b906d0-a22e-4d8f-83e6-b54e887d3335/file', u'owner': u'55bbe36a87af48c0af04c9204a49a854', u'virtual_size': None, u'id': u'c6b906d0-a22e-4d8f-83e6-b54e887d3335', u'size': 0, u'min_disk': 0, u'name': u'test_snapshot_zy', u'checksum': None, u'created_at': u'2016-05-10T11:17:10Z', u'block_device_mapping': u'[{"guest_format": null, "boot_index": 0, "no_device": null, "snapshot_id": "55581528-cb88-4e5a-bee4-d3bb267a93cc", "delete_on_termination": null, "disk_bus": "virtio", "image_id": null, "source_type": "snapshot", "device_type": "disk", "volume_id": null, "destination_type": "volume", "volume_size": null}, {"guest_format": null, "boot_index": null, "no_device": null, "snapshot_id": "9fcbc64c-1ebc-43d7-b899-6c7a42093697", "delete_on_termination": null, "disk_bus": null, "image_id": null, "source_type": "snapshot", "device_type": null, "volume_id": null, "destination_type": "volume", "volume_size": null}]', u'disk_format': None, u'bdm_v2': u'True', u'protected': False, u'root_device_name': u'/dev/vda', u'schema': u'/v2/schemas/image'}

In V1, 'block_device_mapping' as a key of 'properties'. But There is no 'properties' in V2.
So, the cinder and the nova don't Parse 'block_device_mapping'the attribute.

[wangxiyuan (wangxiyuan)]

Could you describe the problem you meet in Nova or Cinder? ASAIK, Nova or Cinder deal with Glance in different ways between v1 and v2.

[YaoZheng_ZTE (zheng-yao1)]

Hi xiyuan:
   In cinder, the user can config use glance-api V1 or V2. cinder.conf has a config item "glance_api_version". cinder parse the metadata as the V1 format. When use glance_api_version = 2, cinder cannot get 'properties' key. So, cinder can not parse the metadata.

[wangxiyuan (wangxiyuan)]

hmm, I got your problem. It's the different between v1 and v2 in glance. But we could not fix it in glance IMO, for that it will break the Glance's API response body which will break the backward compatibility(This kind of response format has last for many cycles).

I suggest you to fix it in Cinder. In cinder when you get the image's information, you should make sure it's the old one(v1) or the new one(v2).

[wangxiyuan (wangxiyuan)]

Is there any influence for Cinder or Nova now? What's the bug behavior for Cinder or Nova?

[Sean McGinnis (sean-mcginnis)]

I know we have conditional handling in Cinder, at least in some places. Is there a specific place you are seeing this not handled correctly?

[Sean McGinnis (sean-mcginnis)]

Glance v1 has now been removed, so this is no longer needed.