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 1.6 2004/08/25 01:53:39 dillon Exp $ 29# 30# PROVIDE: initdiskless 31# KEYWORD: DragonFly 32 33. /etc/rc.subr 34dummy_rc_command "$1" 35 36# On entry to this script the entire system consists of a read-only root 37# mounted via NFS. We use the contents of /conf to create and populate 38# memory filesystems. The kernel has run BOOTP and configured an interface 39# (otherwise it would not have been able to mount the NFS root!) 40# 41# The following directories are scanned. Each successive directory overrides 42# (is merged into) the previous one. 43# 44# /conf/base universal base 45# /conf/default modified by a secondary universal base 46# /conf/${ipba} modified based on the assigned broadcast IP 47# /conf/${ip} modified based on the machine's assigned IP 48# 49# Each of these directories may contain any number of subdirectories which 50# represent directories in / on the diskless machine. The existance of 51# these subdirectories causes this script to create a MEMORY FILESYSTEM for 52# /<sub_directory_name>. For example, if /conf/base/etc exists then a 53# memory filesystem will be created for /etc. 54# 55# If a subdirectory contains the file 'diskless_remount' the contents of 56# the file is used to remount the subdirectory prior to it being copied to 57# the memory filesystem. For example, if /conf/base/etc/diskless_remount 58# contains the string 'my.server.com:/etc' then my.server.com:/etc will be 59# mounted in place of the subdirectory. This allows you to avoid making 60# duplicates of system directories in /conf. 61# 62# If a subdirectory contains the file 'md_size', the contents of the 63# file is used to determine the size of the memory filesystem, in 512 64# byte sectors. The default is 8192 (4MB). You only have to specify an 65# md_size if the default doesn't work for you (i.e. if it is too big or 66# too small). Note that in -current the default is 4096 (2MB). For 67# example, /conf/base/etc/md_size might contain '16384'. 68# 69# If /conf/<special_dir>/SUBDIR.cpio.gz exists, the file is cpio'd into 70# the specified /SUBDIR (and a memory filesystem is created for /SUBDIR 71# if necessary). 72# 73# If /conf/<special_dir>/SUBDIR.remove exists, the file contains a list 74# of paths which are rm -rf'd relative to /SUBDIR. 75# 76# You will almost universally want to create a /conf/base/etc containing 77# a diskless_remount and possibly an md_size file. You will then almost 78# universally want to override rc.conf, rc.local, and fstab by creating 79# /conf/default/etc/{rc.conf,rc.local,fstab}. Your fstab should be sure 80# to mount a /usr... typically an NFS readonly /usr. 81# 82# NOTE! rc.diskless2 will create /var, /tmp, and /dev. Those filesystems 83# should not be specified in /conf. At least not yet. 84 85dlv=`/sbin/sysctl -n vfs.nfs.diskless_valid 2> /dev/null` 86[ ${dlv:=0} -eq 0 ] && exit 0 87 88# chkerr: 89# 90# Routine to check for error 91# 92# checks error code and drops into shell on failure. 93# if shell exits, terminates script as well as /etc/rc. 94# 95chkerr() { 96 case $1 in 97 0) 98 ;; 99 *) 100 echo "$2 failed: dropping into /bin/sh" 101 /bin/sh 102 # RESUME 103 ;; 104 esac 105} 106 107# Create a generic memory disk 108# 109mount_md() { 110 /sbin/mdmfs -i 4096 -s $1 -M md $2 111} 112 113# Create the memory filesystem if it has not already been created 114# 115create_md() { 116 if [ "x`eval echo \\$md_created_$1`" = "x" ]; then 117 if [ "x`eval echo \\$md_size_$1`" = "x" ]; then 118 md_size=4096 119 else 120 md_size=`eval echo \\$md_size_$1` 121 fi 122 mount_md $md_size /$1 123 /bin/chmod 755 /$1 124 eval md_created_$1=created 125 fi 126} 127 128# DEBUGGING 129# 130# set -v 131 132# Figure out our interface and IP. 133# 134bootp_ifc="" 135bootp_ipa="" 136bootp_ipbca="" 137iflist=`ifconfig -l` 138for i in ${iflist} ; do 139 set `ifconfig ${i}` 140 while [ $# -ge 1 ] ; do 141 if [ "${bootp_ifc}" = "" -a "$1" = "inet" ] ; then 142 bootp_ifc=${i} ; bootp_ipa=${2} ; shift 143 fi 144 if [ "${bootp_ipbca}" = "" -a "$1" = "broadcast" ] ; then 145 bootp_ipbca=$2; shift 146 fi 147 shift 148 done 149 if [ "${bootp_ifc}" != "" ] ; then 150 break 151 fi 152done 153echo "Interface ${bootp_ifc} IP-Address ${bootp_ipa} Broadcast ${bootp_ipbca}" 154 155# Figure out our NFS root path 156# 157set `mount -t nfs` 158while [ $# -ge 1 ] ; do 159 if [ "$2" = "on" -a "$3" = "/" ]; then 160 nfsroot="$1" 161 break 162 fi 163 shift 164done 165 166# Resolve templates in /conf/base, /conf/default, /conf/${bootp_ipbca}, 167# and /conf/${bootp_ipa}. For each subdirectory found within these 168# directories: 169# 170# - calculate memory filesystem sizes. If the subdirectory (prior to 171# NFS remounting) contains the file 'md_size', the contents specified 172# in 512 byte sectors will be used to size the memory filesystem. Otherwise 173# 8192 sectors (4MB) is used. 174# 175# - handle NFS remounts. If the subdirectory contains the file 176# diskless_remount, the contents of the file is NFS mounted over 177# the directory. For example /conf/base/etc/diskless_remount 178# might contain 'myserver:/etc'. NFS remounts allow you to avoid 179# having to dup your system directories in /conf. Your server must 180# be sure to export those filesystems -alldirs, however. 181# If the diskless_remount file contains a string beginning with a 182# '/' it is assumed that the local nfsroot should be prepended to 183# it before attemping to the remount. This allows the root to be 184# relocated without needing to change the remount files. 185# 186for i in base default ${bootp_ipbca} ${bootp_ipa} ; do 187 for j in /conf/$i/* ; do 188 # memory filesystem size specification 189 # 190 subdir=${j##*/} 191 if [ -d $j -a -f $j/md_size ]; then 192 eval md_size_$subdir=`cat $j/md_size` 193 fi 194 195 # NFS remount 196 # 197 if [ -d $j -a -f $j/diskless_remount ]; then 198 nfspt=`/bin/cat $j/diskless_remount` 199 if [ `expr "$nfspt" : '\(.\)'` = "/" ]; then 200 nfspt="${nfsroot}${nfspt}" 201 fi 202 mount_nfs $nfspt $j 203 chkerr $? "mount_nfs $nfspt $j" 204 fi 205 done 206done 207 208# - Create all required MFS filesystems and populate them from 209# our templates. Support both a direct template and a dir.cpio.gz 210# archive. Support dir.remove files containing a list of relative 211# paths to remove. 212# 213# TODO: 214# + find a way to assign a 'group' identifier to a machine 215# so we can use group-specific configurations; 216 217for i in base default ${bootp_ipbca} ${bootp_ipa} ; do 218 for j in /conf/$i/* ; do 219 subdir=${j##*/} 220 if [ -d $j ]; then 221 create_md $subdir 222 cp -Rp $j/* /$subdir 223 fi 224 done 225 for j in /conf/$i/*.cpio.gz ; do 226 subdir=${j%*.cpio.gz} 227 subdir=${subdir##*/} 228 if [ -f $j ]; then 229 create_md $subdir 230 echo "Loading /$subdir from cpio archive $j" 231 (cd / ; /stand/gzip -d < $j | /stand/cpio --extract -d ) 232 fi 233 done 234 for j in /conf/$i/*.remove ; do 235 subdir=${j%*.remove} 236 subdir=${subdir##*/} 237 if [ -f $j ]; then 238 # doubly sure it is a memory disk before rm -rf'ing 239 create_md $subdir 240 (cd /$subdir; rm -rf `/bin/cat $j`) 241 fi 242 done 243done 244 245