Hi all, We (Citrix) are working on Nova-Glance integration for XenAPI, under the bexar-xenapi-support-for-glance<https://blueprints.launchpad.net/nova/+spec/bexar-xenapi-support-for-glance> blueprint, but I see that something similar has just been merged as part of Rick Harris' xenapi_snapshots_first_cut<https://code.launchpad.net/~rconradharris/nova/xenapi_snapshots_first_cut> branch for the xs-snapshots<https://blueprints.launchpad.net/nova/+spec/xs-snapshots> blueprint. We need to get our design ideas lined up, otherwise we're just wasting time both trying to do the same thing at the same time.
Firstly, I see that Rick's added a 'glance' XenServer plugin, following what I did with the 'objectstore' plugin. Obviously it was reasonable to copy what was there already, but I now think that this was a mistake on my part, and that the streaming should be done inside nova-compute, rather than in a xapi plugin. The only thing that we should be using the plugin for should be placing the external kernel/ramdisk, if present - everything else can be done with direct XenAPI calls, and doesn't need a plugin. With that in mind, Sateesh is working on putting the Glance client code inside Nova. Is there any particular reason that you _need_ the code inside a plugin for xs-snapshots, or will it be OK if we move it? Assuming that that's OK, where should this code go? There's discussion on the xenapi_snapshots_first_cut merge about ImageService, and how long it's going to be around. I agree that Glance in the long term becomes the image service abstraction, so I expect that the Glance client code would be in or near nova.virt.xenapi, but I haven't looked closely, so I'm open to other suggestions. Is there anywhere else that it should go? I was also expecting Sateesh to implement the Glance authentication, once Jay is finished with middleware-authentication<https://blueprints.launchpad.net/glance/+spec/middleware-authentication>. Was anyone else expecting to do this? Finally, we're expecting to follow the same model for ESX-Glance integration as we do for XS-Glance integration, and we're expecting to do that work at Citrix too. I presume that that's OK with everyone. Thanks, Ewan.
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