busybox-init

#!/bin/sh
# Save this file as "init" in the root of your CPIO archive,
# and chmod +x it. This will chroot into an HDD if one is
# available. Or it will just give a prompt.

mkdir -p /proc /sys /d /pstore /dev
mount -t proc none /proc
mount -t sysfs none /sys
mount -t debugfs none /d
mount -t debugfs none /sys/kernel/debug/
mount -t pstore none /pstore >/dev/null 2>&1

cd /dev/
mknod sda b 8 0
mknod ashmem c 10 62

# If command specified on kernel cmdline, run it and quit
cmdrun=$(cat /proc/cmdline|cut -d \" -f2)

echo -e "\nBoot took $(cut -d' ' -f1 /proc/uptime) seconds only\n"

# If a drive is attached, just assume its ext4 and
# chroot into it.
mkdir -p /hda
mount -t ext4 /dev/sda /hda >/dev/null 2>&1
if [ $? -eq 0 ]; then
	mkdir -p /hda/proc; mount --bind /proc /hda/proc
	mkdir -p /hda/sys ; mount --bind /sys  /hda/sys
	mkdir -p /hda/d   ; mount -t debugfs none /hda/d
	mount -t debugfs none /hda/sys/kernel/debug/

	if [ "x$cmdrun" != "x" ]; then BASHOPTS1="-c \"$cmdrun\""; fi
	echo "Chrooting into /hda"
	setsid cttyhack /bin/bash -c "chroot /hda bash --rcfile /.bashrc $BASHOPTS1"
	busybox poweroff -f
fi

if [ "x$cmdrun" != "x" ]; then
	setsid cttyhack /bin/bash -c "$cmdrun"
else
	setsid cttyhack /bin/bash
fi

busybox poweroff -f