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-rw-r--r--extras/start_udev91
1 files changed, 91 insertions, 0 deletions
diff --git a/extras/start_udev b/extras/start_udev
new file mode 100644
index 0000000000..caba5270c2
--- /dev/null
+++ b/extras/start_udev
@@ -0,0 +1,91 @@
+#! /bin/bash
+#
+# start_udev
+#
+# script to initialize /dev by using udev.
+#
+# This needs to be run at the earliest possible point in the boot
+# process.
+#
+# Based on the udev init.d script
+#
+
+. /etc/udev/udev.conf
+
+prog=udev
+sysfs_dir=/sys
+bin=/sbin/udev
+udevd=/sbin/udevd
+
+run_udev () {
+ # handle block devices and their partitions
+ for i in ${sysfs_dir}/block/*; do
+ # add each drive
+ export DEVPATH=${i#${sysfs_dir}}
+ echo "$DEVPATH"
+ $bin block
+
+ # add each partition, on each device
+ for j in $i/*; do
+ if [ -f $j/dev ]; then
+ export DEVPATH=${j#${sysfs_dir}}
+ echo "$DEVPATH"
+ $bin block
+ fi
+ done
+ done
+ # all other device classes
+ for i in ${sysfs_dir}/class/*; do
+ for j in $i/*; do
+ if [ -f $j/dev ]; then
+ export DEVPATH=${j#${sysfs_dir}}
+ CLASS=`echo ${i#${sysfs_dir}} | \
+ cut --delimiter='/' --fields=3-`
+ echo "$DEVPATH"
+ $bin $CLASS
+ fi
+ done
+ done
+ return 0
+}
+
+make_extra_nodes () {
+ # there are a few things that sysfs does not export for us.
+ # these things go here (and remember to remove them in
+ # remove_extra_nodes()
+ #
+ # Thanks to Gentoo for the initial list of these.
+ ln -snf /proc/self/fd $udev_root/fd
+ ln -snf /proc/self/fd/0 $udev_root/stdin
+ ln -snf /proc/self/fd/1 $udev_root/stdout
+ ln -snf /proc/self/fd/2 $udev_root/stderr
+ ln -snf /proc/kcore $udev_root/core
+
+ mkdir $udev_root/pts
+ mkdir $udev_root/shm
+}
+
+# don't use udev if sysfs is not mounted.
+if [ ! -d $sysfs_dir/block ]; then
+ exit 1
+fi
+
+echo "mounting... ramfs at $udev_root"
+mount -n -t ramfs none $udev_root
+
+# We want to start udevd ourselves if it isn't already running. This
+# lets udevd run at a sane nice level...
+echo "starting udevd"
+$udevd &
+
+# propogate /udev from /sys
+export ACTION=add
+export UDEV_NO_SLEEP=1
+echo "Creating initial udev device nodes:"
+run_udev
+
+echo "making extra nodes"
+make_extra_nodes
+
+echo "udev startup is finished!"
+exit 0