1#!/bin/sh 2# 3# Copyright (c) 1999 Matt Dillon 4# All rights reserved. 5# 6# Redistribution and use in source and binary forms, with or without 7# modification, are permitted provided that the following conditions 8# are met: 9# 1. Redistributions of source code must retain the above copyright 10# notice, this list of conditions and the following disclaimer. 11# 2. Redistributions in binary form must reproduce the above copyright 12# notice, this list of conditions and the following disclaimer in the 13# documentation and/or other materials provided with the distribution. 14# 15# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25# SUCH DAMAGE. 26# 27# $FreeBSD: src/etc/rc.d/initdiskless,v 1.24 2003/06/30 21:47:06 brooks Exp $ 28# $DragonFly: src/etc/rc.d/initdiskless,v 1.7 2005/11/19 21:47:32 swildner Exp $ 29# 30# PROVIDE: initdiskless 31 32. /etc/rc.subr 33dummy_rc_command "$1" 34 35# On entry to this script the entire system consists of a read-only root 36# mounted via NFS. We use the contents of /conf to create and populate 37# memory filesystems. The kernel has run BOOTP and configured an interface 38# (otherwise it would not have been able to mount the NFS root!) 39# 40# The following directories are scanned. Each successive directory overrides 41# (is merged into) the previous one. 42# 43# /conf/base universal base 44# /conf/default modified by a secondary universal base 45# /conf/${ipba} modified based on the assigned broadcast IP 46# /conf/${ip} modified based on the machine's assigned IP 47# 48# Each of these directories may contain any number of subdirectories which 49# represent directories in / on the diskless machine. The existance of 50# these subdirectories causes this script to create a MEMORY FILESYSTEM for 51# /<sub_directory_name>. For example, if /conf/base/etc exists then a 52# memory filesystem will be created for /etc. 53# 54# If a subdirectory contains the file 'diskless_remount' the contents of 55# the file is used to remount the subdirectory prior to it being copied to 56# the memory filesystem. For example, if /conf/base/etc/diskless_remount 57# contains the string 'my.server.com:/etc' then my.server.com:/etc will be 58# mounted in place of the subdirectory. This allows you to avoid making 59# duplicates of system directories in /conf. 60# 61# If a subdirectory contains the file 'md_size', the contents of the 62# file is used to determine the size of the memory filesystem, in 512 63# byte sectors. The default is 8192 (4MB). You only have to specify an 64# md_size if the default doesn't work for you (i.e. if it is too big or 65# too small). Note that in -current the default is 4096 (2MB). For 66# example, /conf/base/etc/md_size might contain '16384'. 67# 68# If /conf/<special_dir>/SUBDIR.cpio.gz exists, the file is cpio'd into 69# the specified /SUBDIR (and a memory filesystem is created for /SUBDIR 70# if necessary). 71# 72# If /conf/<special_dir>/SUBDIR.remove exists, the file contains a list 73# of paths which are rm -rf'd relative to /SUBDIR. 74# 75# You will almost universally want to create a /conf/base/etc containing 76# a diskless_remount and possibly an md_size file. You will then almost 77# universally want to override rc.conf, rc.local, and fstab by creating 78# /conf/default/etc/{rc.conf,rc.local,fstab}. Your fstab should be sure 79# to mount a /usr... typically an NFS readonly /usr. 80# 81# NOTE! rc.diskless2 will create /var, /tmp, and /dev. Those filesystems 82# should not be specified in /conf. At least not yet. 83 84dlv=`/sbin/sysctl -n vfs.nfs.diskless_valid 2> /dev/null` 85[ ${dlv:=0} -eq 0 ] && exit 0 86 87# chkerr: 88# 89# Routine to check for error 90# 91# checks error code and drops into shell on failure. 92# if shell exits, terminates script as well as /etc/rc. 93# 94chkerr() { 95 case $1 in 96 0) 97 ;; 98 *) 99 echo "$2 failed: dropping into /bin/sh" 100 /bin/sh 101 # RESUME 102 ;; 103 esac 104} 105 106# Create a generic memory disk 107# 108mount_md() { 109 /sbin/mdmfs -i 4096 -s $1 -M md $2 110} 111 112# Create the memory filesystem if it has not already been created 113# 114create_md() { 115 if [ "x`eval echo \\$md_created_$1`" = "x" ]; then 116 if [ "x`eval echo \\$md_size_$1`" = "x" ]; then 117 md_size=4096 118 else 119 md_size=`eval echo \\$md_size_$1` 120 fi 121 mount_md $md_size /$1 122 /bin/chmod 755 /$1 123 eval md_created_$1=created 124 fi 125} 126 127# DEBUGGING 128# 129# set -v 130 131# Figure out our interface and IP. 132# 133bootp_ifc="" 134bootp_ipa="" 135bootp_ipbca="" 136iflist=`ifconfig -l` 137for i in ${iflist} ; do 138 set `ifconfig ${i}` 139 while [ $# -ge 1 ] ; do 140 if [ "${bootp_ifc}" = "" -a "$1" = "inet" ] ; then 141 bootp_ifc=${i} ; bootp_ipa=${2} ; shift 142 fi 143 if [ "${bootp_ipbca}" = "" -a "$1" = "broadcast" ] ; then 144 bootp_ipbca=$2; shift 145 fi 146 shift 147 done 148 if [ "${bootp_ifc}" != "" ] ; then 149 break 150 fi 151done 152echo "Interface ${bootp_ifc} IP-Address ${bootp_ipa} Broadcast ${bootp_ipbca}" 153 154# Figure out our NFS root path 155# 156set `mount -t nfs` 157while [ $# -ge 1 ] ; do 158 if [ "$2" = "on" -a "$3" = "/" ]; then 159 nfsroot="$1" 160 break 161 fi 162 shift 163done 164 165# Resolve templates in /conf/base, /conf/default, /conf/${bootp_ipbca}, 166# and /conf/${bootp_ipa}. For each subdirectory found within these 167# directories: 168# 169# - calculate memory filesystem sizes. If the subdirectory (prior to 170# NFS remounting) contains the file 'md_size', the contents specified 171# in 512 byte sectors will be used to size the memory filesystem. Otherwise 172# 8192 sectors (4MB) is used. 173# 174# - handle NFS remounts. If the subdirectory contains the file 175# diskless_remount, the contents of the file is NFS mounted over 176# the directory. For example /conf/base/etc/diskless_remount 177# might contain 'myserver:/etc'. NFS remounts allow you to avoid 178# having to dup your system directories in /conf. Your server must 179# be sure to export those filesystems -alldirs, however. 180# If the diskless_remount file contains a string beginning with a 181# '/' it is assumed that the local nfsroot should be prepended to 182# it before attemping to the remount. This allows the root to be 183# relocated without needing to change the remount files. 184# 185for i in base default ${bootp_ipbca} ${bootp_ipa} ; do 186 for j in /conf/$i/* ; do 187 # memory filesystem size specification 188 # 189 subdir=${j##*/} 190 if [ -d $j -a -f $j/md_size ]; then 191 eval md_size_$subdir=`cat $j/md_size` 192 fi 193 194 # NFS remount 195 # 196 if [ -d $j -a -f $j/diskless_remount ]; then 197 nfspt=`/bin/cat $j/diskless_remount` 198 if [ `expr "$nfspt" : '\(.\)'` = "/" ]; then 199 nfspt="${nfsroot}${nfspt}" 200 fi 201 mount_nfs $nfspt $j 202 chkerr $? "mount_nfs $nfspt $j" 203 fi 204 done 205done 206 207# - Create all required MFS filesystems and populate them from 208# our templates. Support both a direct template and a dir.cpio.gz 209# archive. Support dir.remove files containing a list of relative 210# paths to remove. 211# 212# TODO: 213# + find a way to assign a 'group' identifier to a machine 214# so we can use group-specific configurations; 215 216for i in base default ${bootp_ipbca} ${bootp_ipa} ; do 217 for j in /conf/$i/* ; do 218 subdir=${j##*/} 219 if [ -d $j ]; then 220 create_md $subdir 221 cp -Rp $j/* /$subdir 222 fi 223 done 224 for j in /conf/$i/*.cpio.gz ; do 225 subdir=${j%*.cpio.gz} 226 subdir=${subdir##*/} 227 if [ -f $j ]; then 228 create_md $subdir 229 echo "Loading /$subdir from cpio archive $j" 230 (cd / ; /stand/gzip -d < $j | /stand/cpio --extract -d ) 231 fi 232 done 233 for j in /conf/$i/*.remove ; do 234 subdir=${j%*.remove} 235 subdir=${subdir##*/} 236 if [ -f $j ]; then 237 # doubly sure it is a memory disk before rm -rf'ing 238 create_md $subdir 239 (cd /$subdir; rm -rf `/bin/cat $j`) 240 fi 241 done 242done 243 244