# Copyright (c) 1999  Matt Dillion
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#
# $FreeBSD$
#

#
# /etc/rc.diskless1 - general BOOTP startup
#
# We assume that the shared readonly partition has been created with
# the script /usr/share/examples/diskless/clone_root or similar
# methods.
#
# BOOTP has mounted / for us.  We assume a read-only mount, and that the
# /conf subdirectory contains the following:
#   + /conf/base/etc
#	a copy of /etc, prepared by e.g. the clone_root script
#   + /conf/default
#	default files that override the ones in the readonly root
#   + /conf/${ipba}	(${ipba} is the subnet broadcast address for the host)
#	subnet-specific files that override the ones in the readonly root
#   + /conf/${ip}	(${ip} is the ip address for the host)
#	host-specific files that override the ones in the readonly root
#
# Now we need to do the following:
#   + figure out our IP by querying the interface
#   + mount /etc as an MFS
#   + populate /etc from /conf/base/etc
#   + override files in /etc with files from /conf/{default,${ipba},${ip}/etc
#
# The operator is in charge of setting /conf/*/etc/* things as appropriate.
# Typically rc.conf and fstab need to be changed, but possibly
# also other files such as inetd.conf etc.

# chkerr:
#
# Routine to check for error
#
#	checks error code and drops into shell on failure.
#	if shell exits, terminates script as well as /etc/rc.
#
chkerr() {
	case $1 in
	0)
		;;
	*)
		echo "$2 failed: dropping into /bin/sh"
		/bin/sh
		# RESUME
		;;
	esac
}

mount_md() {
	/sbin/mount_mfs -s $1 -T qp120at -b 8192 -f 1024 dummy $2
}

# DEBUGGING
#
# set -v

# Figure out our interface and IP.
#
bootp_ifc=""
bootp_ipa=""
bootp_ipbca=""
iflist=`ifconfig -l`
for i in ${iflist} ; do
    set `ifconfig ${i}`
    while [ $# -ge 1 ] ; do
        if [ "${bootp_ifc}" = "" -a "$1" = "inet" ] ; then
            bootp_ifc=${i} ; bootp_ipa=${2} ; shift
        fi
        if [ "${bootp_ipbca}" = "" -a "$1" = "broadcast" ] ; then
            bootp_ipbca=$2; shift
        fi
        shift
    done
    if [ "${bootp_ifc}" != "" ] ; then
        break
    fi
done
echo "Interface ${bootp_ifc} IP-Address ${bootp_ipa} Broadcast ${bootp_ipbca}"


# Create an MFS /tmp to temporarily hold files from /etc until we
# can bootstrap /etc as an MFS.

mount_md 8192 /etc 0
chkerr $? "MFS mount on /etc"
/bin/chmod 755 /etc

# Populate /etc, and then override the base setup with increasingly
# specific files.
# The copy, especially the one with the initial content, touches
# a large number of files, and can be very slow if the server is
# far away. So, if there exists a cpio archive with the proper
# content, use that one instead.
#
# TODO:
#   + find a way to assign a 'group' identifier to a machine
#	so we can use group-specific configurations;
#   + implement a way to _delete_ files when overriding configs.

for i in base default ${bootp_ipbca} ${bootp_ipa} ; do
	if [ -f /conf/${i}/etc.cpio.gz ]; then
		echo "Loading ${i}/etc from cpio archive"
		(cd / ; /stand/gzip -d < /conf/${i}/etc.cpio.gz | \
			/stand/cpio --extract -d )
	elif [ -d /conf/${i}/etc ]; then
		cp -Rp /conf/${i}/etc/* /etc
	fi
done

# Tell /etc/rc to run the specified script after
# it does its mounts but before it does anything
# else.
#
# This script is responsible for setting up the
# diskless mount environment.

diskless_mount="/etc/rc.diskless2"