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Change abandoned by Sean Dague (sean at dague.net) on branch: master
Review: https://review.openstack.org/121604
Reason: This review is > 4 weeks without comment and currently blocked by a core reviewer with a -2. We are abandoning this for now. Feel free to reactivate the review by pressing the restore button and contacting the reviewer with the -2 on this review to ensure you address their concerns.

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https://bugs.launchpad.net/bugs/1369627

Title:
  libvirt disk.config will have issues when booting two with different
  config drive values

Status in OpenStack Compute (Nova):
  Fix Released
Status in OpenStack Security Advisories:
  Won't Fix

Bug description:
  Currently, in the image creating code for Juno we have

          if configdrive.required_by(instance):
              LOG.info(_LI('Using config drive'), instance=instance)

              image_type = self._get_configdrive_image_type()
              backend = image('disk.config', image_type)
              backend.cache(fetch_func=self._create_configdrive,
                            filename='disk.config' + suffix,
                            instance=instance,
                            admin_pass=admin_pass,
                            files=files,
                            network_info=network_info)

  The important thing to notice here is that we have
  "filename='disk.confg' + suffix".  This means that the filename for
  the config drive in the cache directory will be simply 'disk.config'
  followed by any potential suffix (e.g. '.rescue').  This name is not
  unique to the instance whose config drive we are creating.  Therefore,
  when we go to boot another instance with a different config drive, the
  cache function will detect the old config drive, and decide it doesn't
  need to create the new config drive with the appropriate config for
  the new instance.

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