#!/bin/sh

export PATH=/bin:/sbin
export HOME=/var/home

# Where to mount the real root partition
export NEW_ROOT=/new_root

rescue_shell() {
	echo "Starting the recovery shell ..."
	cat /etc/motd
	exec sh
	exit 0
}

if [ ! -d "$NEW_ROOT" ]; then
	echo "WARNING: trying to remount / RW and create $NEW_ROOT ..."
	mount -u -w / &&
	    mkdir $NEW_ROOT ||
	    rescue_shell
fi

echo "Setting up /var directories ..."
mount_tmpfs tmpfs /var
mkdir /var/db /var/empty /var/home /var/run /var/tmp

echo "Starting udevd for LVM ..."
udevd

echo "Executing additional rc scripts ..."
for rcs in /etc/rc.*; do
	if [ -x "$rcs" ]; then
		. $rcs
	fi
done

echo "Mounting real root partition at $NEW_ROOT ..."

IFS=':'
REAL_ROOT=$(sysctl -n vfs.real_root)
if [ $? -ne 0 ]; then
	echo "ERROR: vfs.real_root sysctl no exist. The kernel is too old."
	rescue_shell
fi
if [ -z "${REAL_ROOT}" ]; then
	echo "ERROR: vfs.real_root sysctl not set."
	rescue_shell
fi
set -- $REAL_ROOT
unset IFS

TYPE=$1
if [ "$TYPE" = "local" ]; then
	FSTYPE=$2
	MOUNTFROM="/dev/${3#/dev/}"
	echo "Executing: mount -t $FSTYPE $4 $MOUNTFROM $NEW_ROOT"
	mount -o ro -t $FSTYPE $4 $MOUNTFROM $NEW_ROOT ||
	    rescue_shell
elif [ -x "/etc/rcmount_${TYPE}" ]; then
	. /etc/rcmount_${TYPE} "$@" ||
	    rescue_shell
else
	echo "ERROR: Unsupported root filesystem type: $TYPE."
	rescue_shell
fi

echo "Stopping udevd ..."
kill $(cat /var/run/udevd.pid)

echo "Cleaning up and umounting /var ..."
rm -rf /var/*
umount /var

echo "Mounting devfs on real root ..."
#mount_devfs $NEW_ROOT/dev
mount_null /dev $NEW_ROOT/dev