This patch addresses an issue where the `snapshot_id` is not being passed onto the Rackspace Cloud from the Fog Block Storage Service. Note that this patch will only work with Fog 1.15.0. To install it, save the patch in the same directory as your script and name it `volume_patch`. You will also need to include this line at the top of your scrip…

volume_patch.rb

if Fog::VERSION == "1.15.0"
  
  require 'rubygems'
  require 'fog'
  require 'fog/rackspace/models/block_storage/volume'
 
 Fog::Logger.warning "PATCHING Fog::Rackspace::BlockStorage::Volume to honor snapshot_id attribute"
 
  module Fog
    module Rackspace
      class BlockStorage
        class Volume < Fog::Model
        
          # Creates volume
          # @raise [Fog::Rackspace::BlockStorage::IdentifierTaken] if the volume has been previously saved.
          # @return [Boolean] returns true if volume was successfully created
          # @raise [Fog::Rackspace::BlockStorage::NotFound] - HTTP 404
          # @raise [Fog::Rackspace::BlockStorage::BadRequest] - HTTP 400
          # @raise [Fog::Rackspace::BlockStorage::InternalServerError] - HTTP 500
          # @raise [Fog::Rackspace::BlockStorage::ServiceError]
          # @note A volume object cannot be updated
          # @see http://docs.rackspace.com/cbs/api/v1.0/cbs-devguide/content/POST_createVolume__v1__tenant_id__volumes.html
          def save
            requires :size
            raise IdentifierTaken.new('Resaving may cause a duplicate volume to be created') if persisted?
            data = service.create_volume(size, {
              :display_name => display_name,
              :display_description => display_description,
              :volume_type => volume_type,
              :availability_zone => availability_zone,
              :snapshot_id => attributes[:snapshot_id]
            })
            merge_attributes(data.body['volume'])
            true
          end
        end
      end
    end
  end
 
else
  Fog::Logger.warning "PATCHING Fog::Rackspace::BlockStorage::Volume - does not apply for #{Fog::VERSION}. Please remove it."  
end