rc.initdiskless revision 75931 
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 75931 2001-04-25 05:46:40Z imp $
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
65mount_md() {
66	/sbin/mdconfig -a -t malloc -s $1 -u $3
67	/sbin/disklabel -r -w md$3 auto
68	/sbin/newfs /dev/md$3c
69	/sbin/mount /dev/md$3c $2
70}
71
72# DEBUGGING
73#
74# set -v
75
76# Figure out our interface and IP.
77#
78bootp_ifc=""
79bootp_ipa=""
80bootp_ipbca=""
81iflist=`ifconfig -l`
82for i in ${iflist} ; do
83    set `ifconfig ${i}`
84    while [ $# -ge 1 ] ; do
85        if [ "${bootp_ifc}" = "" -a "$1" = "inet" ] ; then
86            bootp_ifc=${i} ; bootp_ipa=${2} ; shift
87        fi
88        if [ "${bootp_ipbca}" = "" -a "$1" = "broadcast" ] ; then
89            bootp_ipbca=$2; shift
90        fi
91        shift
92    done
93    if [ "${bootp_ifc}" != "" ] ; then
94        break
95    fi
96done
97echo "Interface ${bootp_ifc} IP-Address ${bootp_ipa} Broadcast ${bootp_ipbca}"
98
99
100# Create an MFS /tmp to temporarily hold files from /etc until we
101# can bootstrap /etc as an MFS.
102
103mount_md 4096 /tmp 0
104chmod 1777 /tmp
105chkerr $? "MFS mount on /tmp"
106/bin/cp -Rp /etc /tmp
107chkerr $? "cp /etc to /tmp/etc MFS"
108
109mount_md 4096 /etc 1
110chkerr $? "MFS mount on /etc"
111/bin/chmod 755 /etc
112
113/bin/cp -Rp /tmp/etc/* /etc
114chkerr $? "cp /tmp/etc to /etc MFS"
115
116rm -rf /tmp/etc
117/sbin/umount /tmp
118/sbin/mdconfig -d -u 0
119
120# Allow for override files to replace files in /etc.  Use /conf/*/etc
121# to find the override files.  First choice is default files that
122# always override, then files that from the directory that matches the
123# client's broadcast address, finally followed by overrides that match
124# the client's IP address.
125#
126# This way we have some flexibility to handle clusters of machines
127# on separate subnets.
128#
129
130for i in default ${bootp_ipbca} ${bootp_ipa} ; do
131	if [ -d /conf/${i}/etc ]; then
132		cp -Rp /conf/${i}/etc/* /etc
133	fi
134done
135
136# Tell /etc/rc to run the specified script after
137# it does its mounts but before it does anything
138# else.
139#
140# This script is responsible for setting up the
141# diskless mount environment.  This can be
142# overriden by /conf/ME/rc.conf.local if, for
143# example, you do not want to run the standard
144# system /etc/rc.diskless2
145
146diskless_mount="/etc/rc.diskless2"
147