#!/bin/bash
#
# 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...
#
# don't use udev if sysfs is not mounted.

sysfs_dir=/sys

export TZ=/etc/localtime

[ -d $sysfs_dir/class ] || exit 1
[ -r /proc/mounts ] || exit 1
[ -x /sbin/udevd ] || exit 1
[ -f /etc/udev/udev.conf ] && . /etc/udev/udev.conf
udev_root=${udev_root-/dev}

if [ -f /dev/.in_sysinit ]; then
	exec >/dev/console 2>/dev/console </dev/console
fi

. /etc/init.d/functions
. /etc/sysconfig/udev

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

# Check SELinux status
selinuxfs="$(fstab_decode_str `LC_ALL=C awk '/ selinuxfs / { print $2 }' /proc/mounts`)"
SELINUX_STATE=
if [ -n "$selinuxfs" ] && [ "`cat /proc/self/attr/current`" != "kernel" ]; then
        if [ -r "$selinuxfs/enforce" ] ; then
                SELINUX_STATE=`cat "$selinuxfs/enforce"`
        else
                # assume enforcing if you can't read it
                SELINUX_STATE=1
        fi
fi
[ -c /dev/systty ] && ln -fs tty0 /dev/systty

touch_recursive() {
	( cd $1;
	for i in *; do 
		[[ -c "$i" || -b "$i" ]] && touch --no-create "$i"
		[ -d "$i" ] && touch_recursive "$i"
	done )
	return 0
}

xargs_simple () {
	if [ "$1" = "-n" ]; then
		shift
		MAXNR="$1"
		shift
	else
		MAXNR=100
	fi
	NR=$MAXNR
	ARGS=""
	[ -z "$1" ] && set echo

	while read line; do
		if [ $NR -gt 0 ]; then
        		ARGS="$ARGS $line"
	        	NR=$[$NR - 1]
		else
        		"$@" $ARGS
	        	NR=$MAXNR
		        ARGS="$line"
		fi
	done
	if [ -n "$ARGS" ]; then
		"$@" $ARGS
	fi 
}

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
	[ -d $udev_root/hugepages ] || mkdir -m 0755 $udev_root/hugepages
	[ -a /dev/MAKEDEV ] || ln -s $MAKEDEV /dev/MAKEDEV;

	USE_MD5="false"
	[[ "$UDEV_USE_MAKEDEV_CACHE" == "yes" && -x /usr/bin/md5sum ]] && USE_MD5="true"

	for i in 0 1 2 3 4 5 6 7; do
		[ -b /dev/loop$i ] || /bin/mknod -m 0640 /dev/loop$i b 7 $i
		/bin/chown root:disk /dev/loop$i
	done

	for i in 0 1 2 3; do
		[ -c /dev/lp$i ] || /bin/mknod -m 0660 /dev/lp$i c 6 $i
		/bin/chown root:lp /dev/lp$i
	done

	[ -d /dev/net ] || mkdir -p /dev/net 
	[ -c /dev/net/tun ] || /bin/mknod -m 0666 /dev/net/tun c 10 200
	#/bin/chown root:root /dev/net/tun

	[ -c /dev/ppp ] || /bin/mknod -m 0600 /dev/ppp c 108 0
	#/bin/chown root:root /dev/ppp

	[ -c /dev/fuse ] || /bin/mknod -m 0666 /dev/fuse c 10 229
	#/bin/chown root:root /dev/fuse

	if [ -x /sbin/restorecon ]; then
		/sbin/restorecon -R /dev
	fi

	if [ -x "$MAKEDEV" ]; then
		for i in /etc/udev/makedev.d/*.nodes; do
			if [ -f "$i" ]; then 			   
				# use a little caching to speedup things
				if [ "$USE_MD5" == "true" ]; then
					# fix for MAKEDEV shell scripts
					[ -d /dev/.udev/makedev.d ] || mkdir -p /dev/.udev/makedev.d 
					md5=$(/usr/bin/md5sum "$i"|(read a b; echo $a))-se$SELINUX_STATE
					if [ -f "/var/lib/udev/makedev.d/${md5}.sh" ];then
						md5file="/var/lib/udev/makedev.d/${md5}.sh"
					else
						md5file="/dev/.udev/makedev.d/${md5}.sh"
					fi
					if [ ! -f "$md5file" ]; then
						( sed -e 's,#.*,,g' "$i" | \
							xargs_simple -n 100 $MAKEDEV -x -a -S ) \
							> "$md5file"
					fi
					. "$md5file" >$udev_root/null 2>&1
				else
						( sed -e 's,#.*,,g' "$i" | \
							xargs_simple -n 100 $MAKEDEV -x )
				fi
			fi
		done 
	fi

	for devdir in /etc/udev/devices /lib/udev/devices; do
		[ -d "$devdir" ] || continue
		pushd $devdir &> "$udev_root/null"
		set *
		if [ "$1" != "*" ]; then
			#echo "Warning: $devdir is deprecated. Please use /etc/udev/makedev.d/."
        		cp -ar "$@" $udev_root/ 
			if [ -x /sbin/restorecon ]; then
				pushd "$udev_root" &> "$udev_root/null"
				/sbin/restorecon "$@"
				popd &> "$udev_root/null"
			fi
		fi
		popd &> "$udev_root/null"
	done
}

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

findalias () {
	local n
	for n in "$1"/* ; do
		[ -h "$n" ] && continue
		[ -d "$n" ] && { findalias "$n" ; continue; }
		[ "${n##*/}" == "modalias" ] && echo $(cat $n)
	done
}

# returns OK if $1 contains $2
strstr() {
  [ "${1#*$2*}" = "$1" ] && return 1
  return 0
}

getval() {
    what=$1
    shift
    for arg; do 
	if strstr "$arg" "$what="; then
	    val=${arg#${what}=*}
	    echo $val
	    return 0
	fi
    done
    return 1
}

wait_for_queue() {
        local timeout=${1:-0}
	local ret=0
	if [ $timeout -gt 0 ]; then
	    /sbin/udevadm settle --timeout=$timeout
        else
	    /sbin/udevadm settle
	fi
	ret=$?
	if [ $ret -ne 0 ]; then
		echo -n "Wait timeout. Will continue in the background."
	fi
	return $ret;
}

export ACTION=add
prog=udev
ret=0
STRING=$"Starting $prog: "
# propagate $udev_root from /sys
echo -n "$STRING"

# mount the tmpfs on ${udev_root%/}, if not already done
LANG=C awk "\$2 == \"${udev_root%/}\" && ( \$3 == \"devtmpfs\" || \$3 == \"tmpfs\" ) { exit 1 }" /proc/mounts && {
	if LANG=C grep -Fq "none ${udev_root%/}/pts " /proc/mounts; then
		PTSDIR=$(mktemp -d)
		mount --move $udev_root/pts "$PTSDIR"
	fi
	if LANG=C grep -Fq "none ${udev_root%/}/shm " /proc/mounts; then
		SHMDIR=$(mktemp -d)
		mount --move $udev_root/shm "$SHMDIR"
	fi
	# First try to mount a devtmpfs on $udev_root
	mount -n -o mode=0755 -t devtmpfs none "$udev_root" 2>/dev/null \
	|| 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 + $?]
}

make_extra_nodes 
kill_udevd > "$udev_root/null" 2>&1
UDEV_OPTS=""
if [ -f "/sys/class/tty/console/uevent" ]; then
	# trigger the sorted events
	echo -e '\000\000\000\000' > /proc/sys/kernel/hotplug

	cmdline=$(cat /proc/cmdline)

	if strstr "$cmdline" udevtrace; then
		UDEV_OPTS="$UDEV_OPTS --debug-trace"
	fi

	if strstr "$cmdline" udevlog; then
		UDEV_OPTS="$UDEV_OPTS --debug"
		/sbin/udevd -d $UDEV_OPTS 2>$udev_root/.udev/udev.log
	else
		/sbin/udevd -d $UDEV_OPTS 
	fi

	wait
	ret=$[$ret + $?]

	udevtimeout=$(getval udevtimeout $cmdline)

	if strstr "$cmdline" udevdebug; then
		/sbin/udevadm control --log-priority=debug
	fi
	if strstr "$cmdline" udevinfo; then
		/sbin/udevadm control --log-priority=info
	fi
	if strstr "$cmdline" udevchilds; then
		/sbin/udevadm control --max-childs=$(getval udevchilds $cmdline)
	fi
	if strstr "$cmdline" noiswmd; then
		/sbin/udevadm control --env=rd_NO_MDIMSM=1
	fi

        /sbin/udevadm control --env=STARTUP=1

	if strstr "$cmdline" modprobedebug; then
		/sbin/udevadm control --env=MODPROBE_OPTIONS="-s -v -q"
		echo
		findalias /sys | while read modules ; do
			if [ -n "$modules" ]; then
				echo "Loading modules for $modules in 5 seconds"
				sleep 5
				/sbin/modprobe -a -v -q $modules
				wait_for_queue $udevtimeout
			fi
		done
		echo "Triggering Rest"
	fi

	/sbin/udevadm trigger --action=add
	ret=$[$ret + $?]
	wait_for_queue $udevtimeout
	ret=$[$ret + $?]
	wait
	ret=$[$ret + $?]
	/sbin/udevadm control --env=STARTUP=
	# touch all device files for timezone glitches
	# "find" is in /usr/bin and might not be available
	if [ -f /etc/sysconfig/clock ]; then
		. /etc/sysconfig/clock
		[[ "$UTC" == "false" || "$UTC" == "no" ]] \
			&& touch_recursive /dev > "$udev_root/null" 2>&1 
	fi
else
	echo -n " kernel too old for this udev version "
	/sbin/udevd -d $UDEV_OPTS
	ret=10
fi

[ $ret -eq 0 ] && success $"$STRING" || failure $"$STRING"
echo
exit 0