first commit

common/minimize.sh

@@ -0,0 +1,36 @@
+#!/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 "$swappart" || true;
+    dd if=/dev/zero of="$swappart" bs=1M || echo "dd exit code $? is suppressed";
+    /sbin/mkswap -U "$swapuuid" "$swappart";
+fi
+
+sync;