def attach(self):
        ec2 = boto.connect_ec2()
        if self.logical_volume_name:
            # if a logical volume was specified, override the specified volume_id
            # (if there was one) with the current AWS volume for the logical volume:
            logical_volume = next(Volume.find(name=self.logical_volume_name))
            self.volume_id = logical_volume._volume_id
        volume = ec2.get_all_volumes([self.volume_id])[0]
        # wait for the volume to be available. The volume may still be being created
        # from a snapshot.
        while volume.update() != 'available':
            boto.log.info('Volume %s not yet available. Current status = %s.' % (volume.id, volume.status))
            time.sleep(5)
        instance = ec2.get_only_instances([self.instance_id])[0]
        attempt_attach = True
        while attempt_attach:
            try:
                ec2.attach_volume(self.volume_id, self.instance_id, self.device)
                attempt_attach = False
            except EC2ResponseError as e:
                if e.error_code != 'IncorrectState':
                    # if there's an EC2ResonseError with the code set to IncorrectState, delay a bit for ec2
                    # to realize the instance is running, then try again. Otherwise, raise the error:
                    boto.log.info((self.volume_id, self.instance_id, e.errors) % 'Attempt to attach the EBS volume %s to this instance (%s) returned %s. Trying again in a bit.')
                    time.sleep(2)
                else:
                    raise e
        boto.log.info('Attached volume %s to instance %s as device %s' % (self.volume_id, self.instance_id, self.device))
        # now wait for the volume device to appear
        while not os.path.exists(self.device):
            boto.log.info('%s still does not exist, waiting 2 seconds' % self.device)
            time.sleep(2)
dataset/ETHPy150Open cloudera/hue/desktop/core/ext-py/boto-2.38.0/boto/pyami/installers/ubuntu/ebs.py/EBSInstaller.attach/swapped operands of `%`