5 # script to initialize /dev by using udev.
7 # Copyright (C) 2004 Greg Kroah-Hartman <greg@kroah.com>
9 # Released under the GPL v2 only.
11 # This needs to be run at the earliest possible point in the boot
14 # Based on the udev init.d script
16 # Thanks go out to the Gentoo developers for proving
17 # that this is possible to do.
19 # Yes, it's very verbose, feel free to turn off all of the echo calls,
20 # they were there to make me feel better that everything was working
21 # properly during development...
23 # default value, if no config present.
28 # don't use udev if sysfs is not mounted.
29 [ -d $sysfs_dir/class ] || exit 1
30 [ -r /proc/mounts ] || exit 1
31 [ -f /etc/udev/udev.conf ] && . /etc/udev/udev.conf
33 . /etc/rc.d/init.d/functions
38 # trim traling slash, code expects it not to be there
39 udev_root=${udev_root%/}
42 grep '^[^#]' /etc/udev/links.conf | \
43 while read type name arg1; do
44 [ "$type" -a "$name" -a ! -e "$udev_root/$name" -a ! -L "/dev/$name" ] ||continue
46 L) ln -s $arg1 $udev_root/$name ;;
47 D) mkdir -p $udev_root/$name ;;
48 M) mknod -m 600 /dev/$name $arg1 ;;
49 *) echo "links.conf: unparseable line ($type $name $arg1)" ;;
52 [ -d /lib/udev/devices ] && cp -a /lib/udev/devices/* /dev/ >/dev/null 2>&1 || :
53 [ -d /lib64/udev/devices ] && cp -a /lib64/udev/devices/* /dev/ >/dev/null 2>&1 || :
57 if [ -x /sbin/pidof ]; then
58 pid=$(/sbin/pidof -x udevd)
59 [ -n "$pid" ] && kill $pid
63 set_hotplug_handler() {
64 echo "" > /proc/sys/kernel/hotplug
67 # find subdirs mounted under $udev_root
69 awk -vudev_root="$udev_root/" '
71 len = length(udev_root);
74 substr($2, 1, len) == udev_root {
75 print substr($2, len + 1)
85 # mount the devtmpfs on $udev_root, if not already done
86 awk "\$2 == \"$udev_root\" && \$3 == \"devtmpfs\" { exit 1 }" /proc/mounts && {
87 submounts=$(get_dev_mounts)
89 if [ "$submounts" ]; then
90 # mount to temporary location to be able to move submounts
91 # this needs writable TMPDIR:-/tmp, so it won't work in early boot
92 # but fix is simple: use initramfs instead of romfs
93 devdir=$(mktemp -d ${TMPDIR:-/tmp}/tmpXXXXXX)
97 mount -n -o mode=0755 -t devtmpfs devtmpfs "$devdir"
101 for dir in $submounts; do
102 mount -n --move $udev_root/$dir $devdir/$dir
106 if [ "$submounts" ]; then
107 mount -n --move $devdir $udev_root
112 kill_udevd > "$udev_root/null" 2>&1
122 if [ -f "/sys/class/tty/console/uevent" ]; then
123 # Setting default hotplug handler
127 # retrigger all events
128 # Udev finds it's own way of making this dir
129 # and making it by hand makes udevsettle
131 #mkdir -p /dev/.udev/queue
135 # wait for the events to finish
139 echo "Kernel too old for this udev version"
143 [ $ret -eq 0 ] && ok || fail