clean-image.sh

#!/bin/bash -x

PID=`docker run -v $(pwd):/workdir -d --privileged -i --rm ubuntu /bin/bash`
docker exec $PID apt-get -q -y update
docker exec $PID apt-get -q -y install debootstrap
docker exec $PID debootstrap --arch amd64 xenial /rootfs http://archive.ubuntu.com/ubuntu
docker exec $PID cp -r /rootfs/ /workdir
echo exit | docker attach $PID

echo "Dockerfile" > rootfs/.dockerignore
echo "FROM scratch
ADD / ." > rootfs/Dockerfile 
cd rootfs
docker build -t "rootfs" .