#!/bin/sh

### BEGIN INIT INFO
# Provides:          udev
# Required-Start:    mountvirtfs
# Required-Stop:
# Default-Start:     S
# Default-Stop:
# Short-Description: Start udevd, populate /dev and load drivers.
### END INIT INFO

. /etc/init.d/functions

export TZ=/etc/localtime

[ -d /sys/class ] || exit 1
[ -r /proc/mounts ] || exit 1
[ -x /usr/lib/systemd/systemd-udevd ] || exit 1
[ -f /etc/default/udev-cache ] && . /etc/default/udev-cache
[ -f /etc/udev/udev.conf ] && . /etc/udev/udev.conf

readfile () {
   filename=$1
   READDATA=""
   if [ -r $filename ]; then
       while read line; do
           READDATA="$READDATA$line"
       done < $filename
   fi
}

case "$1" in
  start)
    export ACTION=add
    # propagate /dev from /sys
    echo "Starting udev"

    # mount the devtmpfs on /dev, if not already done
    LANG=C awk '$2 == "/dev" && ($3 == "devtmpfs") { exit 1 }' /proc/mounts && {
            mount -n -o mode=0755 -t devtmpfs none "/dev"
    }
    [ -e /dev/pts ] || mkdir -m 0755 /dev/pts
    [ -e /dev/shm ] || mkdir -m 1777 /dev/shm
    mount -a -t tmpfs 2>/dev/null

    # cache handling
    if [ "$DEVCACHE" != "" ]; then
            readfile /proc/version
            VERSION="$READDATA"
            readfile /proc/cmdline
            CMDLINE="$READDATA"
            readfile /proc/devices
            DEVICES="$READDATA"
            readfile /proc/atags
            ATAGS="$READDATA"

            if [ -e $DEVCACHE ]; then
                    readfile /etc/udev/cache.data
                    if [ "$READDATA" = "$VERSION$CMDLINE$DEVICES$ATAGS" ]; then
                            (cd /; tar xf $DEVCACHE > /dev/null 2>&1)
                            not_first_boot=1
                            [ "$VERBOSE" != "no" ] && echo "udev: using cache file $DEVCACHE"
                            [ -e /dev/shm/udev.cache ] && rm -f /dev/shm/udev.cache
                    else
                            echo "$VERSION$CMDLINE$DEVICES$ATAGS" > /dev/shm/udev.cache
                    fi
            else
                    echo "$VERSION$CMDLINE$DEVICES$ATAGS" > /dev/shm/udev.cache
            fi
    fi

    # make_extra_nodes
    killproc systemd-udevd > "/dev/null" 2>&1

    # trigger the sorted events
    echo -e '\000\000\000\000' > /proc/sys/kernel/hotplug
    /usr/lib/systemd/systemd-udevd -d

    udevadm control --env=STARTUP=1
    if [ "$not_first_boot" != "" ];then
            udevadm trigger --action=add --subsystem-nomatch=tty --subsystem-nomatch=mem --subsystem-nomatch=vc --subsystem-nomatch=vtconsole --subsystem-nomatch=misc --subsystem-nomatch=dcon --subsystem-nomatch=pci_bus  --subsystem-nomatch=graphics	 --subsystem-nomatch=backlight --subsystem-nomatch=video4linux	--subsystem-nomatch=platform
            (udevadm settle --timeout=3; udevadm control --env=STARTUP=)&
    else
            udevadm trigger --action=add
            udevadm settle
    fi
    ;;
  stop)
    echo "Stopping udevd"
    start-stop-daemon --stop --name systemd-udevd --quiet
    ;;
  restart)
    $0 stop
    sleep 1
    $0 start
    ;;
  status)
    status systemd-udevd
    ;;
  *)
    echo "Usage: $0 {start|stop|status|restart}"
    exit 1
esac
exit 0
