poky/meta/recipes-core/udev/files/init

#!/bin/sh -e

UDEVSTART=/sbin/udevstart

defaults

tmpfs_size="10M" udev_root="/dev"

[ -x $UDEVSTART ] || exit 0

. /etc/udev/udev.conf

##############################################################################

we need to unmount /dev/pts/ and remount it later over the tmpfs

unmount_devpts() { if mountpoint -q /dev/pts/; then umount -l /dev/pts/ fi

if mountpoint -q /dev/shm/; then umount -l /dev/shm/ fi }

mount a tmpfs over /dev, if somebody did not already do it

mount_tmpfs() { if grep -E -q "^[^[:space:]]+ /dev tmpfs" /proc/mounts; then return 0 fi

/dev/.static/dev/ is used by MAKEDEV to access the real /dev/ directory.

/etc/udev/ is recycled as a temporary mount point because it's the only

directory which is guaranteed to be available.

mount -n -o bind /dev /etc/udev

if ! mount -n -o size=$tmpfs_size,mode=0755 -t tmpfs tmpfs /dev; then umount /etc/udev echo "udev requires tmpfs support, not started." exit 1 fi

using ln to test if /dev works, because touch is in /usr/bin/

if ln -s test /dev/test-file; then rm /dev/test-file else echo "udev requires tmpfs support, not started." umount /etc/udev umount /dev exit 1 fi

mkdir -p /dev/.static/dev chmod 700 /dev/.static/

The mount options in busybox are non-standard...

if test -x /bin/mount.util-linux then /bin/mount.util-linux --move /etc/udev /dev/.static/dev elif test -x /bin/busybox then busybox mount -n -o move /etc/udev /dev/.static/dev else echo "udev requires an identifiable mount command, not started." umount /etc/udev umount /dev exit 1 fi }

I hate this hack. -- Md

make_extra_nodes() { [ -e /etc/udev/links.conf ] || return 0 grep '^[^#]' /etc/udev/links.conf |
while read type name arg1; do [ "$type" -a "$name" -a ! -e "/dev/$name" -a ! -L "/dev/$name" ] ||continue case "$type" in L) ln -s $arg1 /dev/$name ;; D) mkdir -p /dev/$name ;; M) mknod -m 600 /dev/$name $arg1 ;; *) echo "links.conf: unparseable line ($type $name $arg1)" ;; esac done }

this function is duplicated in preinst, postinst and d-i

supported_kernel() { case "$(uname -r)" in 2.[012345].|2.6.[0-9]|2.6.[0-9][!0-9]) return 1 ;; 2.6.1[01]|2.6.1[01][!0-9]*) return 1 ;; esac return 0 }

shell version of /usr/bin/tty

my_tty() { [ -x /bin/readlink ] || return 0 [ -e /proc/self/fd/0 ] || return 0 readlink --silent /proc/self/fd/0 || true }

warn_if_interactive() { if [ "$RUNLEVEL" = "S" -a "$PREVLEVEL" = "N" ]; then return 0 fi

TTY=$(my_tty) if [ -z "$TTY" -o "$TTY" = "/dev/console" ]; then return 0 fi

printf "\n\n\nIt has been detected that the command\n\n\t$0 $*\n\n" printf "has been run from an interactive shell.\n" printf "It will probably not do what you expect, so this script will wait\n" printf "60 seconds before continuing. Press ^C to stop it.\n" printf "RUNNING THIS COMMAND IS HIGHLY DISCOURAGED!\n\n\n\n" sleep 60 }

##############################################################################

if ! supported_kernel; then echo "udev requires a kernel >= 2.6.12, not started." exit 1 fi

if [ ! -e /proc/filesystems ]; then echo "udev requires a mounted procfs, not started." exit 1 fi

if ! grep -q ':space:tmpfs$' /proc/filesystems; then echo "udev requires tmpfs support, not started." exit 1 fi

if [ ! -d /sys/class/ ]; then echo "udev requires a mounted sysfs, not started." exit 1 fi

if [ ! -e /proc/sys/kernel/hotplug ] && [ ! -e /sys/kernel/uevent_helper ]; then echo "udev requires hotplug support, not started." exit 1 fi

##############################################################################

When modifying this script, do not forget that between the time that

the new /dev has been mounted and udevstart has been run there will be

no /dev/null. This also means that you cannot use the "&" shell command.

case "$1" in start) if [ -e "$udev_root/.udevdb" ]; then if mountpoint -q /dev/; then TMPFS_MOUNTED=1 else echo ".udevdb already exists on the old $udev_root!" fi fi warn_if_interactive

#echo /sbin/udevsend > /proc/sys/kernel/hotplug
if [ -e /sys/kernel/uevent_helper ] ; then
  echo "" > /sys/kernel/uevent_helper
else
  echo "" > /proc/sys/kernel/hotplug
fi
udevsend
if [ "$UDEV_DISABLED" = "yes" ]; then
  echo "udev disabled on the kernel command line, not started."
  exit 0
fi

if [ ! "$TMPFS_MOUNTED" ]; then
  unmount_devpts
  mount_tmpfs
  [ -d /proc/1 ] || mount -n /proc
  # if this directory is not present /dev will not be updated by udev
  mkdir /dev/.udevdb/
  echo "Creating initial device nodes..."
  udevstart
fi
make_extra_nodes
;;

stop) warn_if_interactive start-stop-daemon --stop --exec /sbin/udevd --quiet unmount_devpts if [ -d /dev/.static/dev/ ]; then umount -l /dev/.static/dev/ || true fi echo "Unmounting /dev..." # unmounting with -l should never fail if ! umount -l /dev; then exit 1 fi ;; restart|force-reload) start-stop-daemon --stop --exec /sbin/udevd --quiet log_begin_msg "Recreating device nodes..." udevstart make_extra_nodes log_end_msg 0 ;; *) echo "Usage: /etc/init.d/udev {start|stop|restart|force-reload}" exit 1 ;; esac

exit 0