packer/packer_templates/_common/minimize.sh

   1 #!/bin/sh -eux
   2
   3 #   Licensed under the Apache License, Version 2.0 (the "License");
   4 #   you may not use this file except in compliance with the License.
   5 #   You may obtain a copy of the License at
   6 #
   7 #       http://www.apache.org/licenses/LICENSE-2.0
   8 #
   9 #   Unless required by applicable law or agreed to in writing, software
  10 #   distributed under the License is distributed on an "AS IS" BASIS,
  11 #   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12 #   See the License for the specific language governing permissions and
  13 #   limitations under the License.
  14
  15 case "$PACKER_BUILDER_TYPE" in
  16   qemu) exit 0 ;;
  17 esac
  18
  19 # Whiteout root
  20 count=$(df --sync -kP / | tail -n1  | awk -F ' ' '{print $4}')
  21 count=$(($count-1))
  22 dd if=/dev/zero of=/tmp/whitespace bs=1M count=$count || echo "dd exit code $? is suppressed";
  23 rm /tmp/whitespace
  24
  25 # Whiteout /boot
  26 count=$(df --sync -kP /boot | tail -n1 | awk -F ' ' '{print $4}')
  27 count=$(($count-1))
  28 dd if=/dev/zero of=/boot/whitespace bs=1M count=$count || echo "dd exit code $? is suppressed";
  29 rm /boot/whitespace
  30
  31 set +e
  32 swapuuid="`/sbin/blkid -o value -l -s UUID -t TYPE=swap`";
  33 case "$?" in
  34     2|0) ;;
  35     *) exit 1 ;;
  36 esac
  37 set -e
  38
  39 if [ "x${swapuuid}" != "x" ]; then
  40     # Whiteout the swap partition to reduce box size
  41     # Swap is disabled till reboot
  42     swappart="`readlink -f /dev/disk/by-uuid/$swapuuid`";
  43     /sbin/swapoff "$swappart";
  44     dd if=/dev/zero of="$swappart" bs=1M || echo "dd exit code $? is suppressed";
  45     /sbin/mkswap -U "$swapuuid" "$swappart";
  46 fi
  47
  48 sync;