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*** This bug is a duplicate of bug 1378689 ***
    https://bugs.launchpad.net/bugs/1378689

** This bug is no longer a duplicate of bug 1482040
   rebuild volume-backed instance with image does not replace image in root disk
** This bug has been marked a duplicate of bug 1378689
   error when rebuilding a instance booted from volume

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https://bugs.launchpad.net/bugs/1474253

Title:
  Cannot rebuild a instance booted from volume

Status in OpenStack Compute (nova):
  In Progress

Bug description:
  User rebuild a instance booted from volume in the following steps.

  1. Stop a instance
  2. Detach a root device volume.
  3. Attach a new root device volume.
  4. Start a instance

  But, currently, It's impossible by these reasons.

  1. User not allowed to detach a root device volume.
     - detach boot device volume without warning 
       (https://bugs.launchpad.net/nova/+bug/1279300)

  2. User not allowed to attach a root device volume expect when creating a instance.
     - A get_next_device_name which is executed when attaching volume, never return a root_device_name.

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