app/helpers/application_helper/button/volume_clone.rb
class ApplicationHelper::Button::VolumeClone < ApplicationHelper::Button::Basic
def disabled?
if !@record.supports?(:clone)
@error_message = _("Cloud Volume \"%{name}\" cannot be cloned because %{reason}") % {:name => @record.name, :reason => @record.unsupported_reason(:clone)}
end
@error_message.present?
end
end