cleanup.sh scripts reviewed to help Packer build a smaller box.

scripts/cleanup.sh

@@ -1,17 +1,54 @@
-# Clean up
-apt-get -y remove linux-headers-$(uname -r) build-essential
+# Reducing the final size of the image to help Packer build a less big box.
+# Credits to Vinicius Massuchetto and his helpful post in GitHub:
+# http://vmassuchetto.github.io/2013/08/14/reducing-a-vagrant-box-size/
+
+# Clean up APT packages
+apt-get -y --purge remove linux-headers-$(uname -r) build-essential
 apt-get -y autoremove
 apt-get -y clean
 
 # Removing leftover leases and persistent rules
-echo "cleaning up dhcp leases"
+echo "Cleaning up dhcp leases"
 rm /var/lib/dhcp/*
 
 # Make sure Udev doesn't block our network
-echo "cleaning up udev rules"
+echo "Cleaning up udev rules"
 mkdir /etc/udev/rules.d/70-persistent-net.rules
 rm -rfv /dev/.udev/
 rm -v /lib/udev/rules.d/75-persistent-net-generator.rules
 
+# Remove Linux headers
+rm -rfv /usr/src/linux-headers*
+
+# Remove Virtualbox specific files
+rm -rfv /usr/src/vboxguest* /usr/src/virtualbox-ose-guest*
+
+# Whiteout root
+echo "Whiteouting /"
+count=`df --sync -kP / | tail -n1  | awk -F ' ' '{print $4}'`;
+count=$((count -= 1))
+dd if=/dev/zero of=/tmp/whitespace bs=1024 count=$count;
+rm /tmp/whitespace;
+
+# Whiteout /boot
+echo "Whiteouting /boot"
+count=`df --sync -kP /boot | tail -n1 | awk -F ' ' '{print $4}'`;
+count=$((count -= 1))
+dd if=/dev/zero of=/boot/whitespace bs=1024 count=$count;
+rm /boot/whitespace;
+
+# Whiteout swap 
+echo "Whiteouting swap"
+swappart=`cat /proc/swaps | tail -n1 | awk -F ' ' '{print $1}'`
+swapoff $swappart;
+dd if=/dev/zero of=$swappart;
+mkswap $swappart;
+swapon $swappart;
+
+# Zero out the rest of the free space using dd.
+echo "Zero out the free space to aid VM compression"
+dd if=/dev/zero of=/EMPTY bs=1M
+rm -f /EMPTY
+
 echo "Adding a 2 sec delay to the interface up, to make the dhclient happy"
 echo "pre-up sleep 2" >> /etc/network/interfaces