Comment 52 for bug 1246201

Reviewed: https://review.openstack.org/123073
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=adecf780d3ed4315e4ce305cb1821d493650494b
Submitter: Jenkins
Branch: master

commit adecf780d3ed4315e4ce305cb1821d493650494b
Author: Michael Still <email address hidden>
Date: Tue Nov 25 15:42:47 2014 +0300

    Handle config drives being stored on rbd

    rbd is the only example of a currently supported image storage
    backend where it makes sense to put the config drive in the
    configured storage backend instead of local hypervisor disk. I
    don't think this makes sense for LVM, where we would be creating
    a LV for a tens of megabytes file, which seems like overkill to
    me. The other storage backends use local disk for their data
    already.

    This use case was covered by the now reverted changes:
      228d0221763b12f11ecbacde4db38b1151f96e31
      0b01e846d40f3b343da9ebe1dae89cca8bc2ac66
      ecce888c469c62374a3cc43e3cede11d8aa1e799

    Support this special case by moving the image to rbd once it has
    been created in the local instance directory on the hypervisor.

    I've tested this change in devstack and it works.

    Related-bug: #1369627
    Related-bug: #1361840
    Related-bug: #1246201

    Co-Authored-By: Mehdi Abaakouk <email address hidden>
    Co-Authored-By: Dan Smith <email address hidden>

    Change-Id: Ia3ca5a18c79d62b71b9c042a612d12dd074b245e