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udev: use init script from OLPC
git-svn-id: https://svn.o-hand.com/repos/poky/trunk@4788 311d38ba-8fff-0310-9ca6-ca027cbcb966
This commit is contained in:
Marcin Juszkiewicz
@@ -1,227 +1,49 @@
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#!/bin/sh -e
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### BEGIN INIT INFO
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# Provides: udev
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# Required-Start: mountvirtfs
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# Required-Stop:
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# Default-Start: S
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# Default-Stop:
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# Short-Description: Start udevd, populate /dev and load drivers.
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### END INIT INFO
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export TZ=/etc/localtime
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# we need to unmount /dev/pts/ and remount it later over the tmpfs
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unmount_devpts() {
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if mountpoint -q /dev/pts/; then
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umount -l /dev/pts/
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fi
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[ -d /sys/class ] || exit 1
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[ -r /proc/mounts ] || exit 1
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[ -x /sbin/udevd ] || exit 1
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[ -f /etc/udev/udev.conf ] && . /etc/udev/udev.conf
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if mountpoint -q /dev/shm/; then
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umount -l /dev/shm/
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fi
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kill_udevd() {
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if [ -x /sbin/pidof ]; then
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pid=`/sbin/pidof -x udevd`
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[ -n "$pid" ] && kill $pid
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fi
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}
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# mount a tmpfs over /dev, if somebody did not already do it
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mount_tmpfs() {
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if grep -E -q "^[^[:space:]]+ /dev tmpfs" /proc/mounts; then
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return
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fi
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export ACTION=add
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# propagate /dev from /sys
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echo -n "Starting udev"
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# /dev/.static/dev/ is used by MAKEDEV to access the real /dev/ directory.
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# /etc/udev/ is recycled as a temporary mount point because it's the only
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# directory which is guaranteed to be available.
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mount -n -o bind /dev /etc/udev
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if ! mount -n -o size=$tmpfs_size,mode=0755 -t tmpfs tmpfs /dev; then
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umount /etc/udev
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echo "udev requires tmpfs support, not started."
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exit 1
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fi
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mkdir -p /dev/.static/dev
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chmod 700 /dev/.static/
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# The mount options in busybox are non-standard...
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if test -x /bin/mount.util-linux
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then
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/bin/mount.util-linux --move /etc/udev /dev/.static/dev
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elif test -x /bin/busybox
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then
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busybox mount -n -o move /etc/udev /dev/.static/dev
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else
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echo "udev requires an identifiable mount command, not started."
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umount /etc/udev
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umount /dev
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exit 1
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fi
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# mount the tmpfs on /dev, if not already done
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LANG=C awk "\$2 == \"/dev\" && \$4 == \"tmpfs\" { exit 1 }" /proc/mounts && {
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mount -n -o mode=0755 -t tmpfs none "/dev"
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mkdir -m 0755 /dev/pts
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mkdir -m 0755 /dev/shm
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}
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# I hate this hack. -- Md
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make_extra_nodes() {
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if [ "$(echo /lib/udev/devices/*)" != "/lib/udev/devices/*" ]; then
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cp -a /lib/udev/devices/* /dev/
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fi
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[ -e /etc/udev/links.conf ] || return 0
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grep '^[^#]' /etc/udev/links.conf | \
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while read type name arg1; do
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[ "$type" -a "$name" -a ! -e "/dev/$name" -a ! -L "/dev/$name" ] ||continue
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case "$type" in
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L) ln -s $arg1 /dev/$name ;;
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D) mkdir -p /dev/$name ;;
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M) mknod -m 600 /dev/$name $arg1 ;;
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*) echo "links.conf: unparseable line ($type $name $arg1)" ;;
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esac
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done
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}
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supported_kernel() {
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case "$(uname -r)" in
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2.[012345].*|2.6.[0-9]|2.6.[0-9][!0-9]*) return 1 ;;
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2.6.1[01]|2.6.1[01][!0-9]*) return 1 ;;
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esac
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return 0
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}
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set_hotplug_handler() {
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case "$(uname -r)" in
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2.6.1[0-4]|2.6.1[0-4][!0-9]*) HANDLER='/sbin/udevsend' ;;
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esac
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echo $HANDLER > /proc/sys/kernel/hotplug
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}
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# shell version of /usr/bin/tty
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my_tty() {
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[ -x /bin/readlink ] || return 0
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[ -e /proc/self/fd/0 ] || return 0
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readlink --silent /proc/self/fd/0 || true
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}
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warn_if_interactive() {
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if [ "$RUNLEVEL" = "S" -a "$PREVLEVEL" = "N" ]; then
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return
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fi
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TTY=$(my_tty)
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if [ -z "$TTY" -o "$TTY" = "/dev/console" ]; then
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return
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fi
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printf "\n\n\nIt has been detected that the command\n\n\t$0 $*\n\n"
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printf "has been run from an interactive shell.\n"
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printf "It will probably not do what you expect, so this script will wait\n"
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printf "60 seconds before continuing. Press ^C to stop it.\n"
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printf "RUNNING THIS COMMAND IS HIGHLY DISCOURAGED!\n\n\n\n"
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sleep 60
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}
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##############################################################################
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PATH="/sbin:/bin:/usr/bin"
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[ -x /sbin/udevd ] || exit 0
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# defaults
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tmpfs_size="10M"
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udev_root="/dev"
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udevd_timeout=30
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. /etc/udev/udev.conf
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if ! supported_kernel; then
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echo "udev requires a kernel >= 2.6.12, not started."
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exit 1
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if [ -e /etc/dev.tar ]; then
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(cd /; tar xf /etc/dev.tar)
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not_first_boot=1
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fi
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if [ ! -e /proc/filesystems ]; then
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echo "udev requires a mounted procfs, not started."
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exit 1
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fi
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# make_extra_nodes
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kill_udevd > "/dev/null" 2>&1
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if ! grep -q '[[:space:]]tmpfs$' /proc/filesystems; then
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echo "udev requires tmpfs support, not started."
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exit 1
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fi
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# trigger the sorted events
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echo -e '\000\000\000\000' > /proc/sys/kernel/hotplug
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/sbin/udevd -d
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if [ ! -d /sys/class/ ]; then
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echo "udev requires a mounted sysfs, not started."
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exit 1
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fi
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if [ ! -e /proc/sys/kernel/hotplug ]; then
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echo "udev requires hotplug support, not started."
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exit 1
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fi
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##############################################################################
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# When modifying this script, do not forget that between the time that
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# the new /dev has been mounted and udevsynthesize has been run there will be
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# no /dev/null. This also means that you cannot use the "&" shell command.
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case "$1" in
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start)
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if [ -e "$udev_root/.udev/" ]; then
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if mountpoint -q /dev/; then
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TMPFS_MOUNTED=1
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else
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echo ".udev/ already exists on the static $udev_root!"
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fi
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else
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warn_if_interactive
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fi
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echo "Starting the hotplug events dispatcher" "udevd"
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udevd --daemon
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set_hotplug_handler
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if [ -z "$TMPFS_MOUNTED" ]; then
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unmount_devpts
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mount_tmpfs
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[ -d /proc/1 ] || mount -n /proc
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fi
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# if this directory is not present /dev will not be updated by udev
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mkdir -p /dev/.udev/ /dev/.udev/db/ /dev/.udev/queue/ /dev/.udevdb/
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# /dev/null must be created before udevd is started
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make_extra_nodes
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echo "Synthesizing the initial hotplug events"
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udevtrigger
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# wait for the udevd childs to finish
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echo "Waiting for /dev to be fully populated"
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while [ -d /dev/.udev/queue/ ]; do
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sleep 1
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udevd_timeout=$(($udevd_timeout - 1))
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if [ $udevd_timeout -eq 0 ]; then
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# ps axf
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break
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fi
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done
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if [ $udevd_timeout -eq 0 ]; then
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echo 'timeout'
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fi
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;;
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stop)
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echo "Stopping the hotplug events dispatcher" "udevd"
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start-stop-daemon --stop --name udevd --quiet
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;;
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restart|force-reload)
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echo "Stopping the hotplug events dispatcher" "udevd"
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if start-stop-daemon --stop --name udevd --quiet ; then
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exit 1
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fi
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echo "Starting the hotplug events dispatcher" "udevd"
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udevd --daemon
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;;
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*)
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echo "Usage: /etc/init.d/udev {start|stop|restart|force-reload}"
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exit 1
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;;
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esac
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/sbin/udevcontrol env STARTUP=1
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if [ "$not_first_boot" != "" ];then
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/sbin/udevtrigger --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
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(/sbin/udevsettle --timeout=3; /sbin/udevcontrol env STARTUP=)&
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else
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/sbin/udevtrigger
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/sbin/udevsettle
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(cd /; tar cf /etc/dev.tar /dev)
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fi
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echo
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exit 0
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