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 1.9 2008/02/19 22:02:47 thomas Exp $ 29# 30# PROVIDE: initdiskless 31 32. /etc/rc.subr 33dummy_rc_command "$1" 34 35# On entry to this script the entire system consists of a read-only root 36# mounted via NFS. We use the contents of /conf to create and populate 37# memory filesystems. The kernel has run BOOTP and configured an interface 38# (otherwise it would not have been able to mount the NFS root!) 39# 40# The following directories are scanned. Each successive directory overrides 41# (is merged into) the previous one. 42# 43# /conf/base universal base 44# /conf/default modified by a secondary universal base 45# /conf/${ipbca} modified based on the assigned broadcast IP 46# /conf/${ipa} 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 existence 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 4096 (2MB). 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). For example, /conf/base/etc/md_size might contain '16384'. 66# 67# If /conf/<special_dir>/SUBDIR.cpio.gz exists, the file is cpio'd into 68# the specified /SUBDIR (and a memory filesystem is created for /SUBDIR 69# if necessary). 70# 71# If /conf/<special_dir>/SUBDIR.remove exists, the file contains a list 72# of paths which are rm -rf'd relative to /SUBDIR. 73# 74# You will almost universally want to create a /conf/base/etc containing 75# a diskless_remount and possibly an md_size file. You will then almost 76# universally want to override rc.conf, rc.local, and fstab by creating 77# /conf/default/etc/{rc.conf,rc.local,fstab}. Your fstab should be sure 78# to mount a /usr... typically an NFS readonly /usr. 79# 80# NOTE! rc.d/diskless will create /var, /tmp, and /dev. Those filesystems 81# should not be specified in /conf. At least not yet. 82 83dlv=`/sbin/sysctl -n vfs.nfs.diskless_valid 2> /dev/null` 84[ ${dlv:=0} -eq 0 ] && exit 0 85 86# chkerr: 87# 88# Routine to check for error 89# 90# checks error code and drops into shell on failure. 91# if shell exits, terminates script as well as /etc/rc. 92# 93chkerr() { 94 case $1 in 95 0) 96 ;; 97 *) 98 echo "$2 failed: dropping into /bin/sh" 99 /bin/sh 100 # RESUME 101 ;; 102 esac 103} 104 105# Create a generic memory disk 106# 107mount_md() { 108 /sbin/mount_tmpfs -s $1 tmpfs $2 109} 110 111# Create the memory filesystem if it has not already been created 112# 113create_md() { 114 if [ "x`eval echo \\$md_created_$1`" = "x" ]; then 115 if [ "x`eval echo \\$md_size_$1`" = "x" ]; then 116 if [ "$1" = "etc" ]; then 117 md_size=12M 118 else 119 md_size=2M 120 fi 121 else 122 md_size=`eval echo \\$md_size_$1` 123 124 # for backwards compatibility... 125 # if it's a number, then treat it as number of sectors 126 # 127 if [ "$md_size" = "${md_size%%[!0-9]*}" ]; then 128 md_size=`expr $md_size '*' 512` 129 fi 130 fi 131 mount_md $md_size /$1 132 /bin/chmod 755 /$1 133 eval md_created_$1=created 134 fi 135} 136 137# DEBUGGING 138# 139# set -v 140 141# Figure out our interface and IP. 142# 143bootp_ifc="" 144bootp_ipa="" 145bootp_ipbca="" 146iflist=`ifconfig -l` 147for i in ${iflist} ; do 148 set `ifconfig ${i}` 149 while [ $# -ge 1 ] ; do 150 if [ "${bootp_ifc}" = "" -a "$1" = "inet" ] ; then 151 bootp_ifc=${i} ; bootp_ipa=${2} ; shift 152 fi 153 if [ "${bootp_ipbca}" = "" -a "$1" = "broadcast" ] ; then 154 bootp_ipbca=$2; shift 155 fi 156 shift 157 done 158 if [ "${bootp_ifc}" != "" ] ; then 159 break 160 fi 161done 162echo "Interface ${bootp_ifc} IP-Address ${bootp_ipa} Broadcast ${bootp_ipbca}" 163 164# Figure out our NFS root path 165# 166set `mount -t nfs` 167while [ $# -ge 1 ] ; do 168 if [ "$2" = "on" -a "$3" = "/" ]; then 169 nfsroot="$1" 170 break 171 fi 172 shift 173done 174 175# Resolve templates in /conf/base, /conf/default, /conf/${bootp_ipbca}, 176# and /conf/${bootp_ipa}. For each subdirectory found within these 177# directories: 178# 179# - calculate memory filesystem sizes. If the subdirectory (prior to 180# NFS remounting) contains the file 'md_size', the contents specified 181# in 512 byte sectors will be used to size the memory filesystem. 182# 183# - handle NFS remounts. If the subdirectory contains the file 184# diskless_remount, the contents of the file is NFS mounted over 185# the directory. For example /conf/base/etc/diskless_remount 186# might contain 'myserver:/etc'. NFS remounts allow you to avoid 187# having to dup your system directories in /conf. Your server must 188# be sure to export those filesystems -alldirs, however. 189# If the diskless_remount file contains a string beginning with a 190# '/' it is assumed that the local nfsroot should be prepended to 191# it before attemping to the remount. This allows the root to be 192# relocated without needing to change the remount files. 193# 194for i in base default ${bootp_ipbca} ${bootp_ipa} ; do 195 for j in /conf/$i/* ; do 196 # memory filesystem size specification 197 # 198 subdir=${j##*/} 199 if [ -d $j -a -f $j/md_size ]; then 200 eval md_size_$subdir=`cat $j/md_size` 201 fi 202 203 # NFS remount 204 # 205 if [ -d $j -a -f $j/diskless_remount ]; then 206 nfspt=`/bin/cat $j/diskless_remount` 207 if [ `expr "$nfspt" : '\(.\)'` = "/" ]; then 208 nfspt="${nfsroot}${nfspt}" 209 fi 210 mount_nfs $nfspt $j 211 chkerr $? "mount_nfs $nfspt $j" 212 fi 213 done 214done 215 216# - Create all required MFS filesystems and populate them from 217# our templates. Support both a direct template and a dir.cpio.gz 218# archive. Support dir.remove files containing a list of relative 219# paths to remove. 220# 221# TODO: 222# + find a way to assign a 'group' identifier to a machine 223# so we can use group-specific configurations; 224 225for i in base default ${bootp_ipbca} ${bootp_ipa} ; do 226 for j in /conf/$i/* ; do 227 subdir=${j##*/} 228 if [ -d $j ]; then 229 create_md $subdir 230 cp -Rp $j/* /$subdir 231 fi 232 done 233 for j in /conf/$i/*.cpio.gz ; do 234 subdir=${j%*.cpio.gz} 235 subdir=${subdir##*/} 236 if [ -f $j ]; then 237 create_md $subdir 238 echo "Loading /$subdir from cpio archive $j" 239 (cd /$subdir ; /usr/bin/cpio --extract -d -F $j ) 240 fi 241 done 242 for j in /conf/$i/*.remove ; do 243 subdir=${j%*.remove} 244 subdir=${subdir##*/} 245 if [ -f $j ]; then 246 # doubly sure it is a memory disk before rm -rf'ing 247 create_md $subdir 248 (cd /$subdir; rm -rf `/bin/cat $j`) 249 fi 250 done 251done 252