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[Richard Hagarty <richard.hagarty@xxxxxx>]

Public bug reported:

After Nova patch https://review.openstack.org/#/c/219696 landed, Horizon
users can no longer attach a volume to an instance.

The Nova API requires a non blank "device" value, or null. Horizon is
passing a blank string, which results in the following exception:

Recoverable error: Invalid input for field/attribute device. Value: .
u'' does not match '(^/dev/x{0,1}[a-z]{0,1}d{0,1})([a-z]+)[0-9]*$' (HTTP
400)

** Affects: horizon
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1492450

Title:
  Error when attaching volume to instance

Status in OpenStack Dashboard (Horizon):
  New

Bug description:
  After Nova patch https://review.openstack.org/#/c/219696 landed,
  Horizon users can no longer attach a volume to an instance.

  The Nova API requires a non blank "device" value, or null. Horizon is
  passing a blank string, which results in the following exception:

  Recoverable error: Invalid input for field/attribute device. Value: .
  u'' does not match '(^/dev/x{0,1}[a-z]{0,1}d{0,1})([a-z]+)[0-9]*$'
  (HTTP 400)

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