#!/bin/bash

# Copyright 2014 Amazon.com, Inc. and its affiliates. All Rights Reserved.
#
# Licensed under the MIT License. See the LICENSE accompanying this file
# for the specific language governing permissions and limitations under
# the License.

if [ "$#" -ne 1 ] ; then
  echo "$0 <device path>" >&2
  exit 1
fi

grep -qE '\bmaxcpus=' /proc/cmdline
if [ "$?" -ne 1 ]; then
  echo "maxcpus set, not bringing up additional cpus" >&2
  exit 2
fi

if [ ! -e /sys$1/online ]; then
  echo "/sys$1/online does not exist" >&2
  exit 3
fi

echo 1 > /sys$1/online