#!/bin/sh
# This is a script to initialize udev, which populates the /dev
# directory with device nodes, scans for devices, loads the
# appropriate kernel modules, and configures the devices.

PATH="/sbin:/bin"

case "$1" in
    start)
        # Sanity check -- we aren't running a 2.4.x kernel, are we?
        # This will help stop people from trying to start udev when the
        # machine isn't ready for that...
        if [ "$(uname -r | cut -f 1,2 -d .)" = "2.4" ]; then
          echo "Sorry, but you need a 2.6.15+ kernel to use udev."
          echo "Your kernel version is only $(uname -r)."
          echo
          echo "FATAL:  Refusing to run /etc/rc.d/rc.udev."
          exit 1
        fi

	# Sanity check #2, udev requires that the kernel support tmpfs:
        if ! grep -wq tmpfs /proc/filesystems ; then
          echo "Sorry, but you need tmpfs support in the kernel to use udev."
          echo
          echo "FATAL:  Refusing to run /etc/rc.d/rc.udev."
          exit 1
        fi

        # Sanity check #3, make sure that a 2.6.x kernel is new enough:
        if [ "$(uname -r | cut -f 1,2 -d .)" = "2.6" ]; then
          if [ "$(uname -r | cut -f 3 -d . | sed 's/[^[:digit:]].*//')" -lt "15" ]; then
            echo "Sorry, but you need a 2.6.15+ kernel to use udev."
            echo "Your kernel version is only $(uname -r)."
            echo
            echo "FATAL:  Refusing to run /etc/rc.d/rc.udev."
            exit 1
          fi
        fi

        # Sanity check #4, make sure the udev package was not removed.  If udevd
        # is not there, this will also shut off this script to prevent further
        # problems:
        if [ ! -x /sbin/udevd ]; then
          chmod 644 /etc/rc.d/rc.udev
          echo "No udevd daemon found."
          echo "Turning off udev:  chmod 644 /etc/rc.d/rc.udev"
          echo "FATAL:  Refusing to run /etc/rc.d/rc.udev."
          exit 1
        fi

        # Disable hotplug helper since udevd listens to netlink:
        if [ -e /proc/sys/kernel/hotplug ]; then
          echo "" > /proc/sys/kernel/hotplug
        fi

	# Copy the needed disk nodes to the static devices directory:
	RDEV=`grep -v '^#' /etc/fstab | sed -ne '/\W\/\W/s#/dev/\(\w*\)[0-9].*#\1#p'`
	if ! [ -e /lib/udev/devices/$RDEV ]; then
		cp -a /dev/`echo $RDEV | cut -f3 -d/` /lib/udev/devices/ 2>/dev/null
	fi
	for i in `grep "$RDEV" /etc/fstab | cut -f1 -d\  | cut -f3 -d/`; do
		if ! [ -e /lib/udev/devices/$i ]; then
			cp -a /dev/$i /lib/udev/devices/ 2>/dev/null
		fi
	done

	# Mount tmpfs on /dev:
	if ! grep -E -q "^[^[:space:]]+ /dev tmpfs" /proc/mounts; then
	    # umount shm if needed
	    if grep -E -q "^[^[:space:]]+ /dev/shm tmpfs" /proc/mounts; then
		umount -l /dev/shm
	    fi

	    # Umount pts if needed, we will remount it later:
	    if grep -E -q "^[^[:space:]]+ /dev/pts devpts" /proc/mounts; then
		umount -l /dev/pts
	    fi

	    # Mount tmpfs on /dev:
	    # the -n is because we don't want /dev umounted when
	    # someone (rc.[06]) calls umount -a
            mount -n -o mode=0755 -t tmpfs tmpfs /dev

	    # Remount pts:
	    mkdir /dev/pts 2> /dev/null
	    mount -n -o mode=0620,gid=5 -t devpts devpts /dev/pts

            # Mount usbfs:
            if ! grep -wq usbfs /proc/mounts ; then
	        if [ -d /proc/bus/usb ]; then
		    mount usbfs -t usbfs /proc/bus/usb -o devgid=10,devmode=0666
	        fi
            fi
	fi

	# Add the static nodes to /dev:
	cp --preserve=all --recursive --remove-destination /lib/udev/devices/* /dev

	# Start udevd:
	echo "Starting udevd:  /sbin/udevd --daemon"
	/sbin/udevd --daemon

	# This lock file prevents network devices from being configured too early:
        # Previously this lock file was /var/lock/subsys/coldplug...
        # but we need to use /dev here since the / partition is read-only
        # and /var might not even be mounted at all.
	touch /dev/coldplug
	mkdir -p /dev/.udev/queue
	
	# Call udevtrigger and udevsettle to do the device configuration:
	/sbin/udevtrigger && /sbin/udevsettle

	;;
    stop)
	echo "Stopping udevd"
        if [ -e /proc/sys/kernel/hotplug ]; then
          echo /sbin/hotplug > /proc/sys/kernel/hotplug
        fi
	killall udevd 
	;;
    restart)
	echo "Restarting udevd"
	killall udevd
	sleep 5
	udevd --daemon
	;;
    reload)
	echo "Reloading udev rules"
	udevcontrol reload_rules
	cp --preserve=all --recursive --update /lib/udev/devices/* /dev
	;;
    force-reload)
	echo "Updating all available device nodes in /dev"
	udevcontrol reload_rules
	rm -rf /dev/.udev /dev/disk
	cp --preserve=all --recursive --update /lib/udev/devices/* /dev
	;;
	
    *)
	echo "Usage: $0 {start|stop|restart|reload|force-reload}"
	exit 1
	;;
esac