code: def volume_present(name, provider=None, **kwargs):
      '''
      Check that a block volume exists.
      '''
      ret = _check_name(name)
      if not ret['result']:
          return ret
  
      volumes = __salt__['cloud.volume_list'](provider=provider)
  
      if name in volumes:
          ret['comment'] = 'Volume exists: {0}'.format(name)
          ret['result'] = True
          return ret
      elif __opts__['test']:
          ret['comment'] = 'Volume {0} will be created.'.format(name)
          ret['result'] = None
          return ret
  
      response = __salt__['cloud.volume_create'](
          names=name,
          provider=provider,
          **kwargs
      )
      if response:
          ret['result'] = True
          ret['comment'] = 'Volume {0} was created'.format(name)
          ret['changes'] = {'old': None, 'new': response}
      else:
          ret['result'] = False
          ret['comment'] = 'Volume {0} failed to create.'.format(name)
      return ref volume_present(name, provider=None, **kwargs):
      '''
      Check that a block volume exists.
      '''
      ret = _check_name(name)
      if not ret['result']:
          return ret
  
      volumes = __salt__['cloud.volume_list'](provider=provider)
  
      if name in volumes:
          ret['comment'] = 'Volume exists: {0}'.format(name)
          ret['result'] = True
          return ret
      elif __opts__['test']:
          ret['comment'] = 'Volume {0} will be created.'.format(name)
          ret['result'] = None
          return ret
  
      response = __salt__['cloud.volume_create'](
          names=name,
          provider=provider,
          **kwargs
      )
      if response:
          ret['result'] = True
          ret['comment'] = 'Volume {0} was created'.format(name)
          ret['changes'] = {'old': None, 'new': response}
      else:
          ret['result'] = False
          ret['comment'] = 'Volume {0} failed to create.'.format(name)
      return ret
docs: Check that a block volume exists.