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[Thierry Carrez <thierry.carrez+lp@xxxxxxxxx>]

** Changed in: nova
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1083424

Title:
  ephemeral devices on LVM don't get mkfs'd

Status in OpenStack Compute (Nova):
  Fix Released

Bug description:
  ephemeral device creation when using LVM devices does not cause the
  resulting filesystem to get newfs'd

  Reading through nova code:
  in utils.py/LibvirtDriver/_create_image
              fn = functools.partial(self._create_ephemeral,
                                     fs_label='ephemeral0',
                                     os_type=instance["os_type"])
  then:
              image('disk.local').cache(fetch_func=fn,
                                        filename=fname,
                                        size=size,
                                        ephemeral_size=ephemeral_gb)
  is called

  cache() then calls imagebackend.py/Lvm/create_image
  create_image() then calls libvirt_utils.create_lvm_image, which creates the LVM
  prepare_template() is then called, leading us cache.call_if_not_exists
  call_if_not_exists contains the following check:
              if not os.path.exists(target):
  since create_image has already created the lvm device, the /dev/ entry exists and therefore our fetch_func (self._create_ephemeral) never gets called, and no filesystem is created on the ephemeral device.

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