Radix cross Linux

#!/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"

check_mounted() {
  grep -E -q "^[^[:space:]]+ $1 $2" /proc/mounts
  return $?
}

mount_devpts() {
  if ! check_mounted /dev/pts devpts ; then
    mkdir /dev/pts 2> /dev/null
    mount -n -o mode=0620,gid=5 -t devpts devpts /dev/pts
  fi
}

mount_devshm() {
  if ! check_mounted /dev/shm tmpfs ; then
    mkdir /dev/shm 2> /dev/null
    mount /dev/shm
  fi
}

case "$1" in
  start)
    # Sanity check #1, 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 #2, 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 "32" ]; then
        echo "Sorry, but you need a 2.6.32+ kernel to use this 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 #3, 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 0644 /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

    if grep -qw devtmpfs /proc/filesystems ; then
      if ! check_mounted /dev devtmpfs ; then
        # umount shm if needed
        check_mounted /dev/shm tmpfs && umount -l /dev/shm

        # Umount pts if needed, we will remount it later:
        check_mounted /dev/pts devpts && umount -l /dev/pts

        # Mount tmpfs on /dev:
        mount -n -t devtmpfs -o size=8M devtmpfs /dev
      fi
    else
      # Mount tmpfs on /dev:
      if ! check_mounted /dev tmpfs ; then
        # umount shm if needed
        check_mounted /dev/shm tmpfs && umount -l /dev/shm

        # Umount pts if needed, we will remount it later:
        check_mounted /dev/pts devpts && umount -l /dev/pts

        # 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 -o size=8M tmpfs /dev
      fi
    fi

    # Mount devpts
    mount_devpts
    mount_devshm

    if ! /sbin/pidof udevd 1>/dev/null 2>/dev/null; then # start udevd
      echo "Creating static nodes in /dev."
      kmod static-nodes -f tmpfiles --output /run/static-nodes
      grep "^d\ " /run/static-nodes | while read line ; do
        mkdir -p -m $(echo $line | cut -f 3 -d ' ') $(echo $line | cut -f 2 -d ' ')
      done
      grep -v "^d\ " /run/static-nodes | while read line ; do
        mknod -m $(echo $line | cut -f 3 -d ' ') \
        $(echo $line | cut -f 2 -d ' ') \
        $(echo $line | cut -b1 ) \
        $(echo $line | cut -f 7 -d ' ' | cut -f 1 -d :) \
        $(echo $line | cut -f 7 -d ' ' | cut -f 2 -d :) 2> /dev/null
      done
      rm -f /run/static-nodes
      # Add any system defined additional device nodes:
      cp --preserve=all --recursive --update /lib/udev/devices/* /dev 2> /dev/null
      # Add any locally defined additional device nodes:
      cp --preserve=all --recursive --update /etc/udev/devices/* /dev 2> /dev/null
      echo "Starting udevd:  /sbin/udevd --daemon"
      /sbin/udevd --daemon
      # Since udev is just now being started we want to use add events:
      echo "Triggering udev events:  /sbin/udevadm trigger --action=add"
      # Call udevtrigger and udevsettle to do the device configuration:
      /sbin/udevadm trigger --type=subsystems --action=add
      /sbin/udevadm trigger --type=devices --action=add
    else # trigger changes for already running udevd
      # If the persistent network rules file does not exist, trigger an add event:
      if [ ! -r /etc/udev/rules.d/70-persistent-net.rules ]; then
        # Test that we can actually write to the directory first:
        if touch /etc/udev/rules.d/testfile 2> /dev/null ; then
          rm -f /etc/udev/rules.d/testfile
          # This should add persistent net rules:
          echo "Triggering udev to write persistent rules to /etc/udev/rules.d/"
          /sbin/udevadm trigger --type=devices --action=add
          sleep 3
          # Create the files if they don't exist at this point.
          # If a machine does not have a network device or an optical
          # device, we don't want to waste time trying to generate
          # rules at every boot.
          # To force another attempt, delete the file(s).
          touch /etc/udev/rules.d/70-persistent-net.rules
        fi
      fi
      # Update the hardware database index (/etc/udev/hwdb.bin), if possible:
      if touch /etc/udev/testfile 2> /dev/null ; then
        rm -f /etc/udev/testfile
        echo "Updating hardware database index:  /sbin/udevadm hwdb --update"
        /sbin/udevadm hwdb --update
      fi
      # Since udevd is running, most of the time we only need change events:
      echo "Triggering udev events:  /sbin/udevadm trigger --action=change"
      /sbin/udevadm trigger --type=subsystems --action=change
      /sbin/udevadm trigger --type=devices --action=change
    fi
    /sbin/udevadm settle --timeout=120
    ;;
  stop)
    echo "Stopping udevd is STRONGLY discouraged and not supported."
    echo "If you are sure you want to do this, use 'force-stop' instead."
    ;;
  force-stop)
    echo "Stopping udevd"
    udevadm control --exit
    killall udevd 2>/dev/null
    ;;
  restart)
    echo "Restarting udevd is STRONGLY discouraged and not supported."
    echo "If you are sure you want to do this, use 'force-restart' instead."
    ;;
  force-restart)
    echo "Restarting udevd"
    udevadm control --exit
    sleep 3
    udevd --daemon
    ;;
  reload)
    echo "Reloading udev rules"
    udevadm control --reload
    ;;
  force-reload)
    echo "Updating all available device nodes in /dev"
    udevadm control --reload
    rm -rf /dev/.udev /dev/disk
    cp --preserve=all --recursive --update /lib/udev/devices/* /dev 2> /dev/null
    ;;

  *)
    echo "Usage: $0 {start|stop|restart|reload|force-reload}"
    exit 1
    ;;
esac