Mount / Unmount a Virtualbox vdi image in linux

mount_vdi.sh

# Mount command
sleep 1; modprobe nbd
sleep 1; qemu-nbd -c /dev/nbd0 /path/to/image.vdi 
sleep 1; mount /dev/nbd0p1 ~/u

# Below command to compress the entire mounted dir tree into a squafs filesystem
# mksquashfs  u/ /path/to/image.squashfs -no-recovery -wildcards -e 'var/cache/apt/archives/*.deb' -e "home/user/Downloads/*" -e home/user/.cache -e home/user/.config/chromium 

# Unmount command
# sleep 1; umount ~/u
# sleep 1; qemu-nbd -d /dev/nbd0 
# sleep 1; modprobe -r nbd