[PATCH] udev init script

I integrated udev with Fedora Core.  The main piece is simply building
/udev on boot, since we don't have an initramfs yet. We should also
clear out /udev on shutdown, for /udev directories mounted on persistent
media.

The attached script goes in /etc/init.d

Then do "chkconfig --add udev"

And the rest is handled automatically.  I made it for Fedora but it will
probably work, with little change, on any Linux system.

Right now it only does sysfs-based discovery of block and tty devices,
since those are the only types of devices I have on my system.  There is
a TODO in the script where we would add the other device types.

diff --git a/etc/init.d/udev b/etc/init.d/udev
new file mode 100644 (file)
index 0000000..99f06c2
--- /dev/null
+++ b/etc/init.d/udev
@@ -0,0 +1,68 @@
+#! /bin/bash
+#
+# random       init script to setup /udev
+#
+# chkconfig: 2345 20 80
+# description: manage user-space device nodes in /udev
+
+. /etc/rc.d/init.d/functions
+
+udev_dir=/udev
+sysfs_dir=/sys
+bin=/sbin/udev
+
+case "$1" in
+  start)
+       if [ ! -d $udev_dir ]; then
+               mkdir $udev_dir
+       fi
+       if [ ! -d $sysfs_dir ]; then
+               exit 1
+       fi
+       # propogate /udev from /sys - we only need this while we do not
+       # have initramfs and an early user-space with which to do early
+       # device bring up
+       action "Creating initial udev device nodes: " /bin/true
+       export ACTION=add
+       # add tty devices
+       for i in ${sysfs_dir}/class/tty/*; do
+               export DEVPATH="/"`echo $i | cut --delimiter='/' --fields=3-`
+               $bin tty
+       done
+       # add block devices and their partitions
+       for i in ${sysfs_dir}/block/*; do
+               export DEVPATH="/"`echo $i | cut --delimiter='/' --fields=3-`
+               $bin block
+               for j in $i/*; do
+                       if [ -f $j/dev ]; then
+                               export DEVPATH="/"`echo $j |  \
+                                       cut --delimiter='/' --fields=3-`
+                               $bin block
+                       fi
+               done
+       done
+       # TODO: add other device classes
+       ;;
+  stop)
+       # be careful
+       if [ $udev_dir -a "$udev_dir" != "/" ]; then
+               # clear out /udev
+               rm -rf ${udev_dir}/*
+       fi
+       ;;
+  status)
+       if [ -d $udev_dir ]; then
+               echo "the udev device node directory exists"
+       else
+               echo "the udev device node directory does not exist"
+       fi
+       ;;
+  restart|reload)
+       # nothing to do here
+       ;;
+  *)
+       echo "Usage: $0 {start|stop|status}"
+       exit 1
+esac
+
+exit 0