freebsd-dev/etc/rc.initdiskless

#!/bin/sh
#
# 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.
#
# $FreeBSD$
#

# PROVIDE: initdiskless
# KEYWORD: FreeBSD

dlv=`/sbin/sysctl -n vfs.nfs.diskless_valid 2> /dev/null`
[ ${dlv:=0} -eq 0 ] && exit 0

#
# BOOTP has mounted / for us.  Assume a read-only mount.  We must then
# - figure out our IP by querying the interface
# - mount /etc as an MFS
# - populate /etc from /conf/default version
# - override files in /etc with files from /conf/*/etc where
#   '*' is default, netmask of client, ip-address of client
#
# 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/mdmfs -i 4096 -s $1 -M md$3 $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}"

if [ -z "`hostname -s`" ]; then
	hostname=`kenv dhcp.host-name`
	hostname $hostname
	echo "Hostname is $hostname"
fi

if [ -d /conf/default/etc ]; then
	mount_md 4096 /etc 0
	chkerr $? "MFS mount on /etc"
	/bin/chmod 755 /etc

	/bin/cp -Rp /conf/default/etc/* /etc
	chkerr $? "cp /conf/default/etc to /etc MFS"
fi

# Allow for override files to replace files in /etc.  Use /conf/*/etc to find
# the override files.  First choice is default files that # always override,
# then files that from the directory that matches the client's broadcast
# address, finally followed by overrides that match the client's IP address.
#
# This way we have some flexibility to handle clusters of machines on
# separate subnets.

for i in ${bootp_ipbca} ${bootp_ipa} ${hostname} ; do
	if [ -d /conf/${i}/etc ]; then
		cp -Rp /conf/${i}/etc/* /etc
	fi
done

#
# if the info is available via dhcp/kenv
# build the resolv.conf
#
if [ ! -e /etc/resolv.conf ]; then
	echo domain `kenv dhcp.domain-name` > /etc/resolv.conf

	set `kenv dhcp.domain-name-servers`
	for ns in `IFS=','; echo $*`; do
		echo nameserver $ns >> /etc/resolv.conf;
	done
fi

exit 2		# Tell /etc/rc to re-source rc.conf