[PATCH] add start_udev init script.

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