#!/rd/bin/sh
#
# /sbin/init for diskless workstations
# Copyright (c) 2000, 2003, 2004 by Jamie Zawinski <jwz@dnalounge.com>
#
# Permission to use, copy, modify, distribute, and sell this software and its
# documentation for any purpose is hereby granted without fee, provided that
# the above copyright notice appear in all copies and that both that
# copyright notice and this permission notice appear in supporting
# documentation.  No representations are made about the suitability of this
# software for any purpose.  It is provided "as is" without express or 
# implied warranty.
#
# Created: 23-Dec-00, Jamie Zawinski <jwz@dnalounge.com>
#
# This file is run by the kernel from a ramdisk file system.  The kernel
# should invoke this as the first thing.  It mounts stuff, then runs init.
#
# The root file system on this ramdisk will remain the kiosk's root
# directory (read-only.)  This script NFS mounts a few directories to
# fill in the dangling symlinks, then invokes init to finish booting.
#
# expects SERVER=<ip> and ID=<n> to be passed on the kernel command line.
# SERVER is IP of the NFS server to use; ID is the name of the sub-directory
# to mount as this particular kiosk's writable (non-shared) file system.


# The programs in /ro/bin are symlinks to busybox, an all-in-one shell
# program.

# First, make sure the boot ramdisk (root file system) is writable.
# (/proc needs to be mounted first, in order for this to work)
/rd/bin/mount -t proc proc /proc
/rd/bin/mount -t rootfs rootfs -o remount,rw /

# first mount various vital directories from the NFS server.
# /ro is the root directory shared between the server and clients..
# /ro2 is the root directory shared between all clients (the pieces
# where the clients differ from the server.)
# /rw is the per-client writable directory; each client has its own.
#
/rd/bin/mount -t nfs -r -o nolock $SERVER:/                 /ro
/rd/bin/mount -t nfs -r -o nolock $SERVER:/home/guest/share /ro2
/rd/bin/mount -t nfs    -o nolock $SERVER:/home/guest/$ID   /rw

# We needed a handful of devices in /dev even before mounting anything.
# Now that the mounts are up, we can use the server's fully-populated dev.
# but devices are still open in our /dev, so just rename it out of the
# way, and then turn /dev into a symlink to the server's version.
#
/rd/bin/mv /dev rd/dev
#/rd/bin/ln -s rw/dev /dev
/rd/bin/mkdir /dev
/rd/bin/mount -t nfs    -o nolock $SERVER:/home/guest/$ID/dev /dev

# Now invoke "init" and complete the boot-up with server-loaded files.
# The argument "#" is what the kernel passes as the runlevel to tell
# init to read the "initdefault" entry in /etc/inittab.
#
#/rd/bin/sh
exec /sbin/init '#'