packer-cn/examples/_common/minimize.sh

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#!/bin/sh -eux
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;