Upgrading VirtualBox Guest Additions inside a running Vagrant box

upgrade_vbox_guest_additions.sh

#!/bin/sh
# For simplicity's sake I dump this file in the project folder and execute 
# it from the VM straight out of /vagrant -> could run as part of box/basebox buildout.

alias apt-get="sudo apt-get"
alias mount="sudo mount"
alias umount="sudo umount"

# Oh. Start by making .vbox_version contain the desired version string.
VBOX_VERSION=$(cat /home/vagrant/.vbox_version)
cd /tmp
apt-get -y install linux-headers-$(uname -r)
wget http://download.virtualbox.org/virtualbox/$VBOX_VERSION/VBoxGuestAdditions_$VBOX_VERSION.iso
mount -o loop VBoxGuestAdditions_$VBOX_VERSION.iso /mnt
sh /mnt/VBoxLinuxAdditions.run
umount /mnt

rm VBoxGuestAdditions_$VBOX_VERSION.iso

# Remove items used for building, since they aren't needed anymore
apt-get -y remove linux-headers-$(uname -r)
apt-get -y autoremove