#!/bin/sh

CGDIR="/sys/fs/cgroup"

# precondition: cgroup mount must exist
mountpoint -q $CGDIR || exit 1

# create booster directory
if [ ! -d $CGDIR/booster ]; then
  FAIL=1
  if mount -o remount,rw $CGDIR; then
    if mkdir $CGDIR/booster; then
      FAIL=0
    fi
    if ! mount -o remount,ro $CGDIR; then
      FAIL=1
    fi
  fi
  [ $FAIL = 0 ] || exit 1
fi

# mount booster directory
if ! mountpoint -q $CGDIR/booster; then
  mount -t cgroup -o none,name=booster cgroup $CGDIR/booster || exit 1
fi

# adjust booster directory permissions
FAIL=0
chown -R root:privileged $CGDIR/booster || FAIL=1
chmod 0774 $CGDIR/booster || FAIL=1
exit $FAIL