freebsd-dev/etc/rc.initdiskless

# 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
#
# BOOTP has mounted / for us.  Assume a read-only mount.  We must then
# - figure out our IP by querying the interface
# - copy /etc temporarily out of the way to /tmp/etc
# - mount /etc as an MFS
# - repopulate /etc with the saved off copy
# - override files in /etc with files from /conf/*/etc where
#   '*' is default, netmask of client, ip-address of client
#
# WARNING: i thing you should not change /etc/rc or strange things could
# happen.
#
# 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/mdconfig -a -t malloc -s $1 -u $3
	/sbin/disklabel -r -w md$3 auto
	/sbin/newfs /dev/md$3c
	/sbin/mount /dev/md$3c $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 4096 /tmp 0
chmod 1777 /tmp
chkerr $? "MFS mount on /tmp"
/bin/cp -Rp /etc /tmp
chkerr $? "cp /etc to /tmp/etc MFS"

mount_md 4096 /etc 1
chkerr $? "MFS mount on /etc"
/bin/chmod 755 /etc

/bin/cp -Rp /tmp/etc/* /etc
chkerr $? "cp /tmp/etc to /etc MFS"

rm -rf /tmp/etc
/sbin/umount /tmp
/sbin/mdconfig -d -u 0

# 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 default ${bootp_ipbca} ${bootp_ipa} ; do
	if [ -d /conf/${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.  This can be
# overriden by /conf/ME/rc.conf.local if, for
# example, you do not want to run the standard
# system /etc/rc.diskless2

diskless_mount="/etc/rc.diskless2"