#!/bin/busybox sh

echo "Starting up the initramfs, please wait..."

# Create required busybox symlinks
for f in $(/bin/busybox --list); do
	[ "$f" = "modprobe" ] && continue
	/bin/busybox ln -s /bin/busybox /bin/${f}
done

[ -d /run ] || mkdir -m 0755 /run
[ -d /dev ] || mkdir -m 0755 /dev
[ -d /root ] || mkdir -m 0700 /root
[ -d /sys ] || mkdir /sys
[ -d /proc ] || mkdir /proc
[ -d /tmp ] || mkdir /tmp
mount -t sysfs -o nodev,noexec,nosuid sysfs /sys 
mount -t proc -o nodev,noexec,nosuid proc /proc 

# Note that this only becomes /dev on the real filesystem if udev's scripts
# are used; which they will be, but it's worth pointing out
if [ -e /etc/udev/udev.conf ]; then
	. /etc/udev/udev.conf
fi
tmpfs_size="10M"
# Mount devtmpfs for /dev, fallback to tmpfs if not supported.
if ! mount -t devtmpfs -o size=$tmpfs_size,mode=0755 devtmpfs /dev; then
	echo "W: devtmpfs not available, falling back to tmpfs for /dev"
	mount -t tmpfs -o size=$tmpfs_size,mode=0755 udev /dev
	[ -e /dev/console ] || mknod -m 0600 /dev/console c 5 1
	[ -e /dev/null ] || mknod /dev/null c 1 3
fi
# Also mount a tmpfs for /run directory.
mount -t tmpfs -o size=$tmpfs_size,mode=0755,nosuid,nodev tmpfs /run

mkdir /run/udev
mkdir /run/.initramfs

# Set modprobe env
export MODPROBE_OPTIONS="-qb"

# Export relevant variables
export ROOT=
export ROOTDELAY=
export ROOTFLAGS=
export ROOTFSTYPE=
export IP=
export BOOT=
export BOOTIF=
export UBIMTD=
export break=
export init=/sbin/init
export quiet=n
export readonly=y
export rootmnt=/root
export debug=
export panic=
export blacklist=
export resume=
export resume_offset=

# Bring in the main config
. /conf/initramfs.conf
for conf in conf/conf.d/*; do
	[ -f ${conf} ] && . ${conf}
done
. /scripts/functions

# Parse command line options
for x in $(cat /proc/cmdline); do
	case $x in
	init=*)
		init=${x#init=}
		;;
	root=*)
		ROOT=${x#root=}
		case $ROOT in
		LABEL=*)
			ROOT="${ROOT#LABEL=}"

			# support any / in LABEL= path (escape to \x2f)
			case "${ROOT}" in
			*/*)
			if command -v sed >/dev/null 2>&1; then
				ROOT="$(echo ${ROOT} | sed 's,/,\\x2f,g')"
			else
				if [ "${ROOT}" != "${ROOT#/}" ]; then
					ROOT="\x2f${ROOT#/}"
				fi
				if [ "${ROOT}" != "${ROOT%/}" ]; then
					ROOT="${ROOT%/}\x2f"
				fi
				IFS='/'
				newroot=
				for s in $ROOT; do
					newroot="${newroot:+${newroot}\\x2f}${s}"
				done
				unset IFS
				ROOT="${newroot}"
			fi
			esac
			ROOT="/dev/disk/by-label/${ROOT}"
			;;
		UUID=*)
			ROOT="/dev/disk/by-uuid/${ROOT#UUID=}"
			;;
		/dev/nfs)
			[ -z "${BOOT}" ] && BOOT=nfs
			;;
		esac
		;;
	rootflags=*)
		ROOTFLAGS="-o ${x#rootflags=}"
		;;
	rootfstype=*)
		ROOTFSTYPE="${x#rootfstype=}"
		;;
	rootdelay=*)
		ROOTDELAY="${x#rootdelay=}"
		case ${ROOTDELAY} in
		*[![:digit:].]*)
			ROOTDELAY=
			;;
		esac
		;;
	nfsroot=*)
		NFSROOT="${x#nfsroot=}"
		;;
	ip=*)
		IP="${x#ip=}"
		;;
	boot=*)
		BOOT=${x#boot=}
		;;
	ubi.mtd=*)
		UBIMTD=${x#ubi.mtd=}
		;;
	resume=*)
		RESUME="${x#resume=}"
		;;
	resume_offset=*)
		resume_offset="${x#resume_offset=}"
		;;
	noresume)
		noresume=y
		;;
	panic=*)
		panic="${x#panic=}"
		case ${panic} in
		*[![:digit:].]*)
			panic=
			;;
		esac
		;;
	quiet)
		quiet=y
		;;
	ro)
		readonly=y
		;;
	rw)
		readonly=n
		;;
	debug)
		debug=y
		quiet=n
		exec >/run/.initramfs/initramfs.debug 2>&1
		set -x
		;;
	debug=*)
		debug=y
		quiet=n
		set -x
		;;
	break=*)
		break=${x#break=}
		;;
	break)
		break=premount
		;;
	blacklist=*)
		blacklist=${x#blacklist=}
		;;
	netconsole=*)
		netconsole=${x#netconsole=}
		;;
	BOOTIF=*)
		BOOTIF=${x#BOOTIF=}
		;;
	esac
done

if [ -n "${noresume}" ]; then
	export noresume
	unset resume
else
	resume=${RESUME:-}
fi

[ -n "${netconsole}" ] && modprobe netconsole netconsole="${netconsole}"

maybe_break top
log_begin_msg "Running /scripts/init-top"
run_scripts /scripts/init-top
log_end_msg

maybe_break modules
log_begin_msg "Loading essential drivers"
load_modules
log_end_msg

maybe_break premount
log_begin_msg "Running /scripts/init-premount"
run_scripts /scripts/init-premount
log_end_msg

maybe_break mount
log_begin_msg "Mounting root file system"
. /scripts/${BOOT}
maybe_break mountroot
mountroot
log_end_msg

maybe_break bottom
log_begin_msg "Running /scripts/init-bottom"
run_scripts /scripts/init-bottom
log_end_msg

validate_init() {
	checktarget="${1}"

	# Work around absolute symlinks
	if [ -d "${rootmnt}" ] && [ -h "${rootmnt}${checktarget}" ]; then
		case $(readlink "${rootmnt}${checktarget}") in /*)
			checktarget="$(chroot ${rootmnt} readlink ${checktarget})"
			;;
		esac
	fi

	# Make sure the specified init can be executed
	if [ ! -x "${rootmnt}${checktarget}" ]; then
		return 1
	fi

	# Upstart uses /etc/init as configuration directory :-/
	if [ -d "${rootmnt}${checktarget}" ]; then
		return 1
	fi
}

# Check init bootarg
if [ -n "${init}" ]; then
	if ! validate_init "$init"; then
		echo "Target filesystem doesn't have requested ${init}."
		init=
	fi
fi

# Common case: /sbin/init is present
if [ ! -x "${rootmnt}/sbin/init" ]; then
	# ... if it's not available search for valid init
	if [ -z "${init}" ] ; then
		for inittest in /sbin/init /etc/init /bin/init /bin/sh; do
			if validate_init "${inittest}"; then
				init="$inittest"
				break
			fi
		done
	fi
	# No init on rootmount
	if ! validate_init "${init}" ; then
		panic "No init found. Try passing init= bootarg."
	fi
fi

maybe_break init

# don't leak too much of env - some init(8) don't clear it
# (keep init, rootmnt)
unset debug
unset MODPROBE_OPTIONS
unset ROOTFLAGS
unset ROOTFSTYPE
unset ROOTDELAY
unset ROOT
unset IP
unset BOOT
unset BOOTIF
unset UBIMTD
unset blacklist
unset break
unset noresume
unset panic
unset quiet
unset readonly
unset resume
unset resume_offset

# Umount misc filesystems, they will be mounted by the init scripts.
umount /sys
umount /proc

mount -o move /run ${rootmnt}/run

# Chain to real filesystem
exec switch_root ${rootmnt} ${init} "$@"
panic "Could not execute run-init."
