init

#!/bin/sh

export PATH=/bin:/usr/bin:/sbin:/usr/sbin

shell() {
	setsid sh -c 'exec sh </dev/tty1 >/dev/tty1 2>&1'
}

problem() {
	msg "Encountered a problem, dropping you to a shell."
	shell
}

msg() {
	[ "$quiet" = y ] && return
	echo ":: $*"
}

mount_root() {
	mkdir $newroot	
	if [ ! "$device" ]; then
		msg "device not scpecified!"
		problem
	fi
	while [ ! -b "$device" ] ; do
		no_device $device
		problem
	done	
	if ! mount -n ${rootfstype:+-t $rootfstype} -o ${rwopt:-ro}${rootflags:+,$rootflags} "$device" "$newroot" ; then
		msg "failed mount root device: $device"
		shell
	fi
}

parse_cmdline() {
	read -r cmdline < /proc/cmdline

	for param in $cmdline ; do
		case $param in
			*=*) key=${param%%=*}; value=${param#*=} ;;
			'#'*) break ;;
			*) key=$param
		esac
		case $key in
			ro|rw) rwopt=$key ;;
			[![:alpha:]_]*|[[:alpha:]_]*[![:alnum:]_]*) ;;
			*) eval "$key"=${value:-y} ;;
		esac
		unset key value
	done

	case "$root" in
		/dev/*    ) device=$root ;;
		UUID=*    ) eval $root; device="/dev/disk/by-uuid/$UUID"  ;;
		PARTUUID=*) eval $root; device="/dev/disk/by-partuuid/$PARTUUID" ;;
		LABEL=*   ) eval $root; device="/dev/disk/by-label/$LABEL" ;;
	esac
}

init=/sbin/init
root=
newroot=/.root
rootdelay=
rootfstype=auto
ro="ro"
rootflags=
device=

mount -t proc proc /proc -o nosuid,noexec,nodev
mount -t sysfs sys /sys -o nosuid,noexec,nodev
mount -t devtmpfs dev /dev -o mode=0755,nosuid
mount -t tmpfs run /run -o nosuid,nodev,mode=0755

parse_cmdline

if [ "$break" = y ] || [ "$break" = pre-mount ]; then
	msg "break pre-mount requested."
	shell
fi

# run hook
if [ -f /runhook.order ]; then
	for hook in $(cat /runhook.order); do
		if [ -f /etc/mkinitrd.d/$hook.run ]; then
			msg "running run hook: $hook"
			. /etc/mkinitrd.d/$hook.run
		fi
	done
fi

# mount root device is root is set
if [ "$root" ]; then
	msg "mounting root: $root"
	mount_root
fi

# run cleanup hook
if [ -f /cleanuphook.order ]; then
	for hook in $(tac /cleanuphook.order); do
		if [ -f /etc/mkinitrd.d/$hook.cleanup ]; then
			msg "running cleanup hook: $hook"
			. /etc/mkinitrd.d/$hook.cleanup
		fi
	done
fi

if [ ! -d "$newroot" ] || [ ! "$(mountpoint $newroot)" ]; then
	msg "seems no root device mounted on newroot."
	problem
fi

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

exec switch_root $newroot "$init" "$@"