#!/bin/sh
#
# start_udev
#
# script to initialize /dev by using udev.
#
# Copyright (C) 2004 Greg Kroah-Hartman <greg@kroah.com>
#
# Released under the GPL v2 only.
#
# This needs to be run at the earliest possible point in the boot 
# process.
#
# Based on the udev init.d script
#
# Thanks go out to the Gentoo developers for proving 
# that this is possible to do.
#
# Yes, it's very verbose, feel free to turn off all of the echo calls,
# they were there to make me feel better that everything was working
# properly during development...

# default value, if no config present.
udev_root="/dev/"
sysfs_dir="/sys"
udevd_timeout=8

# don't use udev if sysfs is not mounted.
[ -d $sysfs_dir/class ] || exit 1
[ -r /proc/mounts ] || exit 1
[ -x /sbin/udev ] || exit 1
[ -f /etc/udev/udev.conf ] && . /etc/udev/udev.conf

. /etc/rc.d/init.d/functions

prog=udev
bin=/sbin/udev
udevd=/sbin/udevd
MAKEDEV="/sbin/MAKEDEV"

make_extra_nodes () {
	ln -snf /proc/self/fd $udev_root/fd
	ln -snf /proc/self/fd/0 $udev_root/stdin
	ln -snf /proc/self/fd/1 $udev_root/stdout
	ln -snf /proc/self/fd/2 $udev_root/stderr
	ln -snf /proc/kcore $udev_root/core

	[ -d $udev_root/pts ] || mkdir -m 0755 $udev_root/pts
	[ -d $udev_root/shm ] || mkdir -m 0755 $udev_root/shm

	if [ -x $MAKEDEV ]; then
		$MAKEDEV -x $( 
			for i in 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15; do
			    echo cpu/$i/microcode;
			done;
			for i in 1 2 3 4 5 6; do echo tty$i;done;
			for i in 0 1 2 3 4 5 6 7; do echo loop$i; done;
			for i in 0 1 2 3; do echo lp$i; echo parport$i;done;
			echo net/tun ppp console null zero;
		);
		[ -a /dev/MAKEDEV ] || ln -sf "$MAKEDEV" /dev/MAKEDEV;
	fi
	cp -a /lib/udev/devices/* /dev/ >/dev/null 2>&1 || :
}

kill_udevd() {
	if [ -x /sbin/pidof ]; then
		pid=`/sbin/pidof -x udevd`
		[ -n "$pid" ] && kill $pid
	fi
}

# we cannot use /usr/bin/find here
find_d () {
	where=$1
	what=$2
	found=""
	for f in $where/*; do
		if [ -d "$f" -a ! -L "$f" ]; then
			if [ "$f" != "${f%%$what}" ];then 
				# make sure we are at the path end
				# we have no dirname and basename
				rest="${f#*$what}"
				[ "${rest##*/}" = "$rest" ] && found="$found $f"
			fi
			found="$found $(find_d $f $what)"
		fi
	done
	echo "$found"
}

# we cannot use /usr/bin/find here
find_f () {
	where=$1
	what=$2
	found=""
	for f in $where/*; do
		if [ -d "$f" -a ! -L "$f" ]; then
			found="$found $(find_f $f $what)"
		elif [ -e "$f" ]; then 
			[ "$where/" = "${f%$what}" ] && found="$found $f"
		fi
	done
	[ -n "$found" ] && echo "$found"
}

# call hotplug with the scsi devices
scsi_replay () {
	HOTPLUG="/sbin/udevsend"

	scsi_hosts=$(find_d /sys/devices host\*)
	SEQNUM=1

	for host in $scsi_hosts; do
		[ -d $host ] || continue
		devs=$(find_f $host type)
		for dev in $devs;do
			[ -f $dev ] || continue
			DEVPATH=${dev%/type}
			DEVPATH=${DEVPATH#/sys}
			/bin/env -i DEVPATH="$DEVPATH" SUBSYSTEM=scsi_device ACTION=add $HOTPLUG scsi_device
			/bin/env -i DEVPATH="$DEVPATH" ACTION=add SUBSYSTEM=scsi $HOTPLUG scsi
		done
	done
	return 0
}

ide_scan() {
	if [ ! -d /proc/ide ]; then
		return 1
	fi
	for i in /proc/ide/*/media; do
		read media < "$i"
		case "$media" in
			disk)
				module=ide-disk
			;;
			cdrom)
				module=ide-cd
			;;
			tape)
				module=ide-tape
			;;
			floppy)
				module=ide-floppy
			;;
			*)
				module=ide-generic
			;;
		esac
		/sbin/modprobe $module
	done
	return 0
}

supported_kernel() {
    case "$(uname -r)" in
    2.[012345].*) return 1 ;;
    esac
    return 0
}

set_hotplug_handler() {
    echo /sbin/udevsend > /proc/sys/kernel/hotplug
}

export ACTION=add
prog=udev
ret=0
show "Starting udev"
busy

if ! supported_kernel; then
    fail
    echo "udev requires a kernel >= 2.6.x, not started."
    exit 0                                                
fi

# mount the tmpfs on ${udev_root%/}, if not already done
LANG=C awk "\$2 == \"${udev_root%/}\" && \$3 == \"tmpfs\" { exit 1 }" /proc/mounts && {
	if LANG=C fgrep -q "none ${udev_root%/}/pts " /proc/mounts; then
		PTSDIR=$(mktemp -d ${TMPDIR:-/tmp}/tmpXXXXXX)
		mount --move $udev_root/pts "$PTSDIR"
	fi
	if LANG=C fgrep -q "none ${udev_root%/}/shm " /proc/mounts; then
		SHMDIR=$(mktemp -d ${TMPDIR:-/tmp}/tmpXXXXXX)
		mount --move $udev_root/shm "$SHMDIR"
	fi
	mount -n -o mode=0755 -t tmpfs none "$udev_root"
	mkdir -m 0755 $udev_root/pts
	mkdir -m 0755 $udev_root/shm
	if [ -n "$PTSDIR" ]; then
		mount --move "$PTSDIR" $udev_root/pts
		rmdir "$PTSDIR"
	fi
	if [ -n "$SHMDIR" ]; then
		mount --move "$SHMDIR" $udev_root/shm
		rmdir "$SHMDIR"
	fi

	ret=$(( $ret + $? ))
}


kill_udevd > "$udev_root/null" 2>&1

scsi_replay > "$udev_root/null" 2>&1

ret=$(( $ret + $? ))

ide_scan > "$udev_root/null" 2>&1

# Starting the hotplug events dispatcher
/sbin/udevd --daemon

# Making extra nodes
make_extra_nodes

# Setting default hotplug handler
set_hotplug_handler

# Synthesizing the initial hotplug events
/sbin/${UDEV_STARTER}

# wait for the udev/udevd childs to finish
while [ "$(cat /proc/[0-9]*/status 2> /dev/null | \
        grep -c -E '^Name:[[:space:]]*udevd?$')" -gt 1 ]; do
    sleep 1
    udevd_timeout=$(($udevd_timeout - 1))
    if [ $udevd_timeout -eq 0 ]; then
	break
    fi
done

# Start workaround for broken Linux input subsystem
/lib/udev/udev_input_coldplug start

ret=$(( $ret + $? ))
[ $ret -eq 0 ] && ok || fail
exit 0