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| Current File : //etc/init.d/udev |
#!/bin/sh -e
### BEGIN INIT INFO
# Provides: udev
# Required-Start: mountkernfs
# Required-Stop:
# Default-Start: S
# Default-Stop:
# X-Interactive: true
# Short-Description: Start udevd, populate /dev and load drivers.
### END INIT INFO
# we need to unmount /dev/pts/ and remount it later over the tmpfs
unmount_devpts() {
if mountpoint -q /dev/pts/; then
umount -n -l /dev/pts/
fi
if mountpoint -q /dev/shm/; then
umount -n -l /dev/shm/
fi
}
# mount a tmpfs over /dev, if somebody did not already do it
mount_tmpfs() {
if grep -E -q "^[^[:space:]]+ /dev (dev)?tmpfs" /proc/mounts; then
mount -n -o remount,${dev_mount_options} -t tmpfs tmpfs /dev
return
fi
if ! mount -n -o $dev_mount_options -t tmpfs tmpfs /dev; then
log_failure_msg "udev requires tmpfs support, not started."
log_end_msg 1
fi
return 0
}
create_dev_makedev() {
if [ -e /sbin/MAKEDEV ]; then
ln -sf /sbin/MAKEDEV /dev/MAKEDEV
else
ln -sf /bin/true /dev/MAKEDEV
fi
}
supported_kernel() {
case "$(uname -r)" in
2.[012345].*|2.6.[0-9]|2.6.[0-9][!0-9]*) return 1 ;;
2.6.1[0-9]|2.6.1[0-9][!0-9]*) return 1 ;;
2.6.2[0-5]|2.6.2[0-5][!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
fi
TTY=$(my_tty)
if [ -z "$TTY" -o "$TTY" = "/dev/console" -o "$TTY" = "/dev/null" ]; then
return
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
}
create_dev_root_rule() {
local udevroot="$1"
[ -e $udevroot/rules.d/61-dev-root-link.rules ] && return 0
eval $(udevadm info --export --export-prefix=ROOT_ --device-id-of-file=/ \
|| true)
[ "$ROOT_MAJOR" -a "$ROOT_MINOR" ] || return 0
echo 'ACTION=="add|change", SUBSYSTEM=="block", ENV{MAJOR}=="'$ROOT_MAJOR'", ENV{MINOR}=="'$ROOT_MINOR'", SYMLINK+="root"' \
> $udevroot/root-link-rule
mv $udevroot/root-link-rule $udevroot/rules.d/61-dev-root-link.rules
}
##############################################################################
[ -x /sbin/udevd ] || exit 0
PATH="/sbin:/bin"
# defaults
tmpfs_size="10M"
udev_root="/dev"
if [ -e /etc/udev/udev.conf ]; then
. /etc/udev/udev.conf
fi
. /lib/lsb/init-functions
if ! supported_kernel; then
log_failure_msg "udev requires a kernel >= 2.6.26, not started."
log_end_msg 1
fi
if [ ! -e /proc/filesystems ]; then
log_failure_msg "udev requires a mounted procfs, not started."
log_end_msg 1
fi
if ! grep -q '[[:space:]]tmpfs$' /proc/filesystems; then
log_failure_msg "udev requires tmpfs support, not started."
log_end_msg 1
fi
if [ ! -d /sys/class/ ]; then
log_failure_msg "udev requires a mounted sysfs, not started."
log_end_msg 1
fi
if [ ! -e /sys/kernel/uevent_helper ]; then
log_failure_msg "udev requires hotplug support, not started."
log_end_msg 1
fi
##############################################################################
# this is experimental and may not work well
if [ "$UDEV_DISABLED" = "yes" ]; then
udev_root=/etc/udev/.dev
export UDEV_ROOT=$udev_root
fi
udev_root=${udev_root%/}
dev_mount_options='mode=0755'
if [ "$tmpfs_size" ]; then
dev_mount_options="size=${tmpfs_size},${dev_mount_options}"
fi
if [ "$udev_root" != "/dev" ]; then
log_warning_msg "udev_root != /dev/"
case "$1" in
start)
if [ -e "$udev_root/.udev/" ]; then
if mountpoint -q $udev_root/; then
log_failure_msg "udev is already active on $udev_root."
log_end_msg 1
else
log_warning_msg ".udev/ already exists on the static $udev_root!"
fi
fi
echo > /sys/kernel/uevent_helper
mount -n -o $dev_mount_options -t tmpfs tmpfs $udev_root
log_daemon_msg "Starting the hotplug events dispatcher" "udevd"
if udevd --daemon; then
log_end_msg $?
else
log_end_msg $?
fi
mkdir -p $udev_root/.udev/rules.d/
create_dev_root_rule $udev_root/.udev/
log_action_begin_msg "Synthesizing initial hotplug events"
if udevadm trigger --action=add; then
log_action_end_msg $?
else
log_action_end_msg $?
fi
;;
stop)
log_daemon_msg "Stopping the hotplug events dispatcher" "udevd"
if start-stop-daemon --stop --name udevd --quiet --oknodo --retry 5; then
log_end_msg $?
else
log_end_msg $?
fi
log_action_begin_msg "Unmounting $udev_root"
# unmounting with -l should never fail
if umount -n -l $udev_root; then
log_action_end_msg $?
else
log_action_end_msg $?
fi
;;
restart)
$0 stop
$0 start
;;
reload|force-reload)
udevadm control --reload-rules
;;
*)
echo "Usage: /etc/init.d/udev {start|stop|restart|reload|force-reload}"
exit 1
;;
esac
exit 0
fi # udev_root != /dev
##############################################################################
# When modifying this script, do not forget that between the time that the
# new /dev has been mounted and udevadm trigger 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/.udev/" ]; then
if mountpoint -q $udev_root/; then
TMPFS_MOUNTED=1
else
log_warning_msg ".udev/ already exists on the static $udev_root!"
fi
else
warn_if_interactive
fi
echo > /sys/kernel/uevent_helper
if [ -z "$TMPFS_MOUNTED" ]; then
unmount_devpts
mount_tmpfs
[ -d /proc/1 ] || mount -n /proc
else
# and clean up the database of the initramfs udev
rm -rf /dev/.udev/
fi
# set the SELinux context for devices created in the initramfs
[ -x /sbin/restorecon ] && /sbin/restorecon -R /dev
# /dev/null must be created before udevd is started
/lib/udev/create_static_nodes || true
log_daemon_msg "Starting the hotplug events dispatcher" "udevd"
if udevd --daemon; then
log_end_msg $?
else
log_end_msg $?
fi
mkdir -p /dev/.udev/rules.d/
create_dev_root_rule /dev/.udev/
log_action_begin_msg "Synthesizing the initial hotplug events"
if udevadm trigger --action=add; then
log_action_end_msg $?
else
log_action_end_msg $?
fi
create_dev_makedev
# wait for the udevd childs to finish
log_action_begin_msg "Waiting for /dev to be fully populated"
if udevadm settle; then
log_action_end_msg 0
else
log_action_end_msg 0 'timeout'
fi
;;
stop)
log_daemon_msg "Stopping the hotplug events dispatcher" "udevd"
if start-stop-daemon --stop --name udevd --quiet --oknodo --retry 5; then
log_end_msg $?
else
log_end_msg $?
fi
;;
restart)
log_daemon_msg "Stopping the hotplug events dispatcher" "udevd"
if start-stop-daemon --stop --name udevd --quiet --oknodo --retry 5; then
log_end_msg $?
else
log_end_msg $? || true
fi
log_daemon_msg "Starting the hotplug events dispatcher" "udevd"
if udevd --daemon; then
log_end_msg $?
else
log_end_msg $?
fi
;;
reload|force-reload)
udevadm control --reload-rules
;;
*)
echo "Usage: /etc/init.d/udev {start|stop|restart|reload|force-reload}"
exit 1
;;
esac
exit 0