# cat init
#!/bin/busybox sh

export PATH=/sbin:/bin
DEBUG=0

rescue_shell() {
	echo "$@"
	echo "Something went wrong. Dropping you to a shell."
	busybox --install -s
	exec /bin/sh
}

# allow the use of UUIDs or filesystem lables
uuidlabel_root() {
	for cmd in $(cat /proc/cmdline) ; do
		case ${cmd} in
			root=*)
				type=$(echo $cmd | cut -d= -f2)
				echo "Mounting rootfs"
				if [ ${type} == "LABEL" ] || [ ${type} == "UUID" ]; then
					uuid=$(echo $cmd | cut -d= -f3)
					mount -o ro $(findfs "${type}"="$uuid") /mnt/root
				else
					mount -o ro $(echo ${cmd} | cut -d= -f2) /mnt/root
				fi
			;;
		esac
	done
}

check_filesystem() {
	# most of code coming from /etc/init.d/fsck

	local fsck_opts="" check_extra="" RC_UNAME=$(uname -s)
	local fs_type="$(grep $1 /mnt/root/etc/fstab | awk '{print 3}')" fsck_prefix=""

	# FIXME : get_bootparam forcefsck
	if [ -e /forcefsck ]; then
		fsck_opts="${fsck_opts} -f"
		check_extra="(check forced)"
	fi

	echo "Checking local filesystem $check_extra : $1"

	if [ "$RC_UNAME" = Linux ]; then
		case "${fs_type}" in
			reiserfs)
				fsck_opts="${fsck_opts} --check"
				fsck_prefix="echo Yes | "
			;;
			ext4)
				fsck_opts="-p ${fsck_opts} -C0 -T"
			;;
			*)
				rescue_shell "unknown fs type ${fs_type}"
			;;
		esac
	fi

	trap : INT QUIT

	# using our own fsck, not the builtin one from busybox
	eval "${fsck_prefix}fsck.${fs_type} ${fsck_opts} $1"

	ret_val=$?


	case ${ret_val} in
		0)
			return 0
		;;
		1)
			echo "Filesystem repaired";
			return 0
		;;
		2|3)
			if [ "${RC_UNAME}" = Linux ]; then
				echo "Filesystem repaired, but reboot needed"
				reboot -f
			else
				rescue_shell "Filesystem still have errors; manual fsck required"
			fi
		;;
		4)
			if [ "${RC_UNAME}" = Linux ]; then
				rescue_shell "Fileystem errors left uncorrected, aborting"
			else
				echo "Filesystem repaired, but reboot needed"
				reboot
			fi
		;;
		8)
			echo "Operational error"
			return 0
		;;
		16)
			echo "Use or Syntax Error"
			return 16
		;;
		32)
			echo "fsck interrupted"
		;;
		127)
			echo "Shared Library Error"
			sleep 20
			return 0
		;;
		*)
			echo ${ret_val}
			echo "Some random fsck error - continuing anyway"
			sleep 20
			return 0
		;;
	esac

	# rescue_shell can't find tty so its broken
	rescue_shell
}

create_labels() {
	mkdir -p /dev/disk/by-label
	while read partition; do
		DEV="$(echo ${partition} | awk '{print $4}')"
		DEV_PATH="/dev/${DEV}"
		if [ -z "${DEV}" -o ! -e "${DEV_PATH}" ]; then
			continue
		fi
		LABEL=$(busybox blkid ${DEV_PATH} | tr ' ' '\n' | grep "LABEL=" | cut -d= -f2 | sed 's/"//g')
		if [ ! -z "${LABEL}" ]; then
			ln -s ${DEV_PATH} /dev/disk/by-label/${LABEL}
		fi
	done < "/proc/partitions"
}
# start for real here

# temporarily mount proc and sys
mount -t proc none /proc
mount -t sysfs none /sys
mount -t devtmpfs none /dev

CMDLINE="$(cat /proc/cmdline)"

for param in ${CMDLINE}; do
	case "${param}" in
	rescue)
		echo "Rescue boot mode: invoking ash."
		rescue_shell "Rescue mode, dropping to shell"
		DEBUG=1
	;;
	debug)
		DEBUG=1
	;;
	esac
done

if [ ${DEBUG} -ne 0 ]; then
	# disable kernel messages from popping onto the screen
	echo 0 > /proc/sys/kernel/printk
	# clear the screen
	clear
fi

# assemble the raid set(s) - they got renumbered from md0, md1 and md2
mdadm --assemble --scan

#scan for raid inner partitions
mdadm --detail --scan

create_labels

# mounting rootfs on /mnt/root
uuidlabel_root || rescue_shell "Error with uuidlabel_root"

# space separated list of mountpoints that ...
mountpoints="/usr /var"

# ... we want to find in /etc/fstab ...
ln -s /mnt/root/etc/fstab /etc/fstab

# ... to check filesystems and mount our devices.
for m in ${mountpoints}; do
	check_filesystem ${m}

	echo "Mounting ${m}"
	# mount the device and ...
	mount ${m} || rescue_shell "Error while mounting ${m}"

	# ... move the tree to its final location
	mount --move ${m} "/mnt/root"${m} || rescue_shell "Error while moving $m"
done

echo "All done. Switching to real root."

if [ ${DEBUG} -ne 0 ]; then
	echo 1 > /proc/sys/kernel/printk
fi
rm -rf /dev/disk/by-label

# clean up. The init process will remount proc sys and dev later
umount /proc
umount /sys
umount /dev

# switch to the real root and execute init
exec switch_root /mnt/root /sbin/init

# cat initramfs_list
# directory structure
dir	/proc								755 0 0
dir	/usr								755 0 0
dir	/bin								755 0 0
dir	/sys								755 0 0
dir	/var								755 0 0
dir	/lib64								755 0 0
dir	/sbin								755 0 0
dir	/mnt								755 0 0
dir	/mnt/root							755 0 0
dir	/etc								755 0 0
dir	/root								700 0 0
dir	/dev								755 0 0

# busybox
file	/bin/busybox			/usr/src/initramfs/bin/busybox	755 0 0

# fsck bins
file	/sbin/fsck.reiserfs		/sbin/fsck.reiserfs		755 0 0
file	/sbin/fsck.ext4			/sbin/fsck.ext4			755 0 0

# mdadm
file	/sbin/mdadm			/usr/src/initramfs/bin/mdadm	755 0 0
file	/etc/mdadm.conf 		/etc/mdadm.conf			755 0 0

slink	/lib				/lib64				777 0 0
file	/lib64/ld-linux-x86-64.so.2	/lib64/ld-linux-x86-64.so.2	755 0 0
file	/lib64/libuuid.so.1		/lib64/libuuid.so.1		755 0 0
file	/lib64/libc.so.6		/lib64/libc.so.6		755 0 0
file	/lib/libext2fs.so.2		/lib/libext2fs.so.2		755 0 0
file	/lib/libcom_err.so.2		/lib/libcom_err.so.2		755 0 0
file	/lib/libpthread.so.0		/lib/libpthread.so.0		755 0 0
file	/lib/libblkid.so.1		/lib/libblkid.so.1		755 0 0
file	/lib/libe2p.so.2		/lib/libe2p.so.2		755 0 0

# our init script
file	/init				/usr/src/initramfs/init		755 0 0