#!/bin/busybox sh

NEWROOT=/.newroot
INITRAMFS=/run/initramfs
MEDIA=$INITRAMFS/media
LOWER=$INITRAMFS/lower
UPPER=$INITRAMFS/upper
WORK=$INITRAMFS/work
SFSIMAGE=$MEDIA/boot/rootfs.sfs

/bin/busybox --install -s /bin

clear

mkdir -p /proc /sys /run /dev
mount -t proc proc /proc
mount -t sysfs sysfs /sys
mount -t tmpfs run /run
mount -t devtmpfs dev /dev

mkdir -p $LOWER $MEDIA $UPPER $WORK $NEWROOT

exec >/dev/console </dev/console 2>&1

PRINTK="`cat /proc/sys/kernel/printk`"
echo "0" > /proc/sys/kernel/printk

# mdev
mkdir -p /etc
echo '$MODALIAS=.* 0:0 660 @modprobe "$MODALIAS"' > /etc/mdev.conf
mdev -df & pid_mdev=$!

# load kernel modules, twice
find /sys -name 'modalias' -type f -exec cat '{}' + | sort -u | xargs modprobe -b -a >/dev/null 2>&1
find /sys -name 'modalias' -type f -exec cat '{}' + | sort -u | xargs modprobe -b -a >/dev/null 2>&1

# load kernel modules required for live iso
for m in loop cdrom isofs overlay squashfs usb-storage loop fuse exfat; do
	modprobe $m >/dev/null 2>&1
done

echo "Please wait..."

# figure out media
if [ -f /proc/sys/dev/cdrom/info ]; then
	CDROM=$(grep name /proc/sys/dev/cdrom/info | awk -F : '{print $2}' | awk '{print $1}')
fi

while [ "$wait" != 10 ]; do
	BLOCK=$(grep -E '[vsh]d' /proc/partitions | awk '{print $4}')
	for i in $CDROM $BLOCK; do
		mount -v -r /dev/$i $MEDIA >/dev/null 2>&1 || continue
		[ -f $MEDIA/boot/livemedia ] || { umount $MEDIA; continue; }
		MEDIAFOUND=1
		break 2
	done
	wait=$(( wait + 1 ))
	sleep 1
done

if [ ! "$MEDIAFOUND" ]; then
	echo "Media not found even after 10 seconds"
	sh
	echo "Cannot go further"
	sleep 99999
	exit 1
fi

# mount stuffs
loopdevice=$(losetup -f)
losetup -f $SFSIMAGE
mount -r $loopdevice $LOWER
mount -t overlay overlay -o lowerdir=$LOWER,upperdir=$UPPER,workdir=$WORK $NEWROOT
if [ -f $MEDIA/boot/rootfs.gz ]; then
	tar -xzaf $MEDIA/boot/rootfs.gz -C $NEWROOT
fi

kill $pid_mdev

mount --move /sys $NEWROOT/sys
mount --move /proc $NEWROOT/proc
mount --move /dev $NEWROOT/dev
mount --move /run $NEWROOT/run

# execute live script if exist
if [ -f $NEWROOT/$MEDIA/boot/live_script.sh ]; then
	chroot $NEWROOT sh $MEDIA/boot/live_script.sh
fi

# switch to newroot
clear
exec /bin/switch_root $NEWROOT /sbin/init

echo "This is the end of initramfs"
echo "Nothing further, here's the shell"
/bin/busybox sh