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Change abandoned by Joe Gordon (joe.gordon0 at gmail.com) on branch: master
Review: https://review.openstack.org/123073
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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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