rc.initdiskless revision 75746 
1# Copyright (c) 1999  Matt Dillion
2# All rights reserved.
3#
4# Redistribution and use in source and binary forms, with or without
5# modification, are permitted provided that the following conditions
6# are met:
7# 1. Redistributions of source code must retain the above copyright
8#    notice, this list of conditions and the following disclaimer.
9# 2. Redistributions in binary form must reproduce the above copyright
10#    notice, this list of conditions and the following disclaimer in the
11#    documentation and/or other materials provided with the distribution.
12#
13# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
14# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
17# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
23# SUCH DAMAGE.
24#
25# $FreeBSD: head/etc/rc.initdiskless 75746 2001-04-20 23:10:11Z bsd $
26#
27
28#
29# /etc/rc.diskless1 - general BOOTP startup
30#
31# BOOTP has mounted / for us.  Assume a read-only mount.  We must then
32# - figure out our IP by querying the interface
33# - copy /etc temporarily out of the way to /tmp/etc
34# - mount /etc as an MFS
35# - repopulate /etc with the saved off copy
36# - override files in /etc with files from /conf/*/etc where
37#   '*' is default, netmask of client, ip-address of client
38#
39# WARNING: i thing you should not change /etc/rc or strange things could
40# happen.
41#
42# The operator is in charge of setting /conf/*/etc/* things as appropriate.
43# Typically rc.conf and fstab need to be changed, but possibly
44# also other files such as inetd.conf etc.
45
46# chkerr:
47#
48# Routine to check for error
49#
50#	checks error code and drops into shell on failure.
51#	if shell exits, terminates script as well as /etc/rc.
52#
53chkerr() {
54	case $1 in
55	0)
56		;;
57	*)
58		echo "$2 failed: dropping into /bin/sh"
59		/bin/sh
60		# RESUME
61		;;
62	esac
63}
64
65# DEBUGGING
66#
67# set -v
68
69# Figure out our interface and IP.
70#
71bootp_ifc=""
72bootp_ipa=""
73bootp_ipbca=""
74iflist=`ifconfig -l`
75for i in ${iflist} ; do
76    set `ifconfig ${i}`
77    while [ $# -ge 1 ] ; do
78        if [ "${bootp_ifc}" = "" -a "$1" = "inet" ] ; then
79            bootp_ifc=${i} ; bootp_ipa=${2} ; shift
80        fi
81        if [ "${bootp_ipbca}" = "" -a "$1" = "broadcast" ] ; then
82            bootp_ipbca=$2; shift
83        fi
84        shift
85    done
86    if [ "${bootp_ifc}" != "" ] ; then
87        break
88    fi
89done
90echo "Interface ${bootp_ifc} IP-Address ${bootp_ipa} Broadcast ${bootp_ipbca}"
91
92
93# Create an MFS /tmp to temporarily hold files from /etc until we
94# can bootstrap /etc as an MFS.
95
96/sbin/mount_mfs -s 4096 -T qp120at dummy /tmp
97chkerr $? "MFS mount on /tmp"
98/bin/cp -Rp /etc /tmp
99chkerr $? "cp /etc to /tmp/etc MFS"
100
101/sbin/mount_mfs -s 4096 -T qp120at dummy /etc
102chkerr $? "MFS mount on /etc"
103/bin/chmod 755 /etc
104
105/bin/cp -Rp /tmp/etc/* /etc
106chkerr $? "cp /tmp/etc to /etc MFS"
107
108rm -rf /tmp/etc
109/sbin/umount /tmp
110
111
112# Allow for override files to replace files in /etc.  Use /conf/*/etc
113# to find the override files.  First choice is default files that
114# always override, then files that from the directory that matches the
115# client's broadcast address, finally followed by overrides that match
116# the client's IP address.
117#
118# This way we have some flexibility to handle clusters of machines
119# on separate subnets.
120#
121
122for i in default ${bootp_ipbca} ${bootp_ipa} ; do
123	if [ -d /conf/${i}/etc ]; then
124		cp -Rp /conf/${i}/etc/* /etc
125	fi
126done
127
128# Tell /etc/rc to run the specified script after
129# it does its mounts but before it does anything
130# else.
131#
132# This script is responsible for setting up the
133# diskless mount environment.  This can be
134# overriden by /conf/ME/rc.conf.local if, for
135# example, you do not want to run the standard
136# system /etc/rc.diskless2
137
138diskless_mount="/etc/rc.diskless2"
139