--- /dev/null
+#!/bin/sh -eux
+
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+case "$PACKER_BUILDER_TYPE" in
+ qemu) exit 0 ;;
+esac
+
+# Whiteout root
+count=$(df --sync -kP / | tail -n1 | awk -F ' ' '{print $4}')
+count=$(($count-1))
+dd if=/dev/zero of=/tmp/whitespace bs=1M count=$count || echo "dd exit code $? is suppressed";
+rm /tmp/whitespace
+
+# Whiteout /boot
+count=$(df --sync -kP /boot | tail -n1 | awk -F ' ' '{print $4}')
+count=$(($count-1))
+dd if=/dev/zero of=/boot/whitespace bs=1M count=$count || echo "dd exit code $? is suppressed";
+rm /boot/whitespace
+
+set +e
+swapuuid="`/sbin/blkid -o value -l -s UUID -t TYPE=swap`";
+case "$?" in
+ 2|0) ;;
+ *) exit 1 ;;
+esac
+set -e
+
+if [ "x${swapuuid}" != "x" ]; then
+ # Whiteout the swap partition to reduce box size
+ # Swap is disabled till reboot
+ swappart="`readlink -f /dev/disk/by-uuid/$swapuuid`";
+ /sbin/swapoff "$swappart";
+ dd if=/dev/zero of="$swappart" bs=1M || echo "dd exit code $? is suppressed";
+ /sbin/mkswap -U "$swapuuid" "$swappart";
+fi
+
+sync;