#!/bin/bash

if [ ! -f "/usr/bin/qemu-system-i386" ] 
then
  sudo apt-get install qemu-system
fi

boot_img="http://archive.debian.org/debian/dists/etch/main/installer-i386/current/images/floppy/boot.img"
root_img="http://archive.debian.org/debian/dists/etch/main/installer-i386/current/images/floppy/root.img"

#make clean
rm -fr root.img boot.img tmp

echo "Getting Mini Debian Boot IMG File..."
wget -c "$boot_img"
echo "Pulling Kernel from IMG File..."
mkdir tmp
sudo mount boot.img tmp
cp tmp/linux ./
sudo umount tmp

echo "Getting Mini Debian RootFS IMG File..."
wget -c "$root_img"

echo "Mounting Root Image and Retrieving initrd..."
sudo mount root.img tmp
cp tmp/initrd.gz ./
sudo umount tmp

#cleanup
rm -fr root.img boot.img tmp

mkdir rootfs
cd rootfs
zcat ../initrd.gz |cpio -i -H newc -d

echo "Setting default shell for boot time..."
cat << EOF > etc/inittab
# /etc/inittab
# busybox init configuration for debian-installer
# main rc script
::sysinit:/bin/busybox sh
# main setup program
::respawn:/sbin/poweroff
#
# # convenience shells
vc/2::askfirst:-/bin/sh
vc/3::askfirst:-/bin/sh
#
# logging
vc/4::respawn:/usr/bin/tail -f /var/log/syslog
#
# # Stuff to do before rebooting
::ctrlaltdel:/sbin/shutdown > /dev/null 2>&1
#
# re-exec init on receipt of SIGHUP/SIGUSR1
::restart:/sbin/init
EOF

echo "Recompressing initrd IMG..."
find | cpio -o -H newc | gzip -2 > ../initrd.gz

cd ../
echo "Starting Qemu virtual machine..."
qemu-system-i386 -kernel linux\
  -initrd initrd.gz\
  -append 'root=/dev/ram0 console=ttyS0 console=ttyS0 rw'\
  -nographic