rc.initdiskless revision 121066
1127664Sbms#!/bin/sh 2127664Sbms# 3127664Sbms# Copyright (c) 1999 Matt Dillon 4127664Sbms# All rights reserved. 5127664Sbms# 6127664Sbms# Redistribution and use in source and binary forms, with or without 7127664Sbms# modification, are permitted provided that the following conditions 8127664Sbms# are met: 9127664Sbms# 1. Redistributions of source code must retain the above copyright 10127664Sbms# notice, this list of conditions and the following disclaimer. 11127664Sbms# 2. Redistributions in binary form must reproduce the above copyright 12127664Sbms# notice, this list of conditions and the following disclaimer in the 13127664Sbms# documentation and/or other materials provided with the distribution. 14127664Sbms# 15127664Sbms# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16127664Sbms# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17127664Sbms# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18127664Sbms# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19127664Sbms# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20127664Sbms# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21127664Sbms# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22127664Sbms# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23127664Sbms# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24127664Sbms# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25127664Sbms# SUCH DAMAGE. 26127664Sbms# 27127664Sbms# $FreeBSD: head/etc/rc.initdiskless 121066 2003-10-13 08:18:05Z dougb $ 28127664Sbms# 29127664Sbms# PROVIDE: initdiskless 30127664Sbms# KEYWORD: FreeBSD 31127664Sbms 32127664Sbms 33127664Sbms# On entry to this script the entire system consists of a read-only root 34127664Sbms# mounted via NFS. We use the contents of /conf to create and populate 35127664Sbms# memory filesystems. The kernel has run BOOTP and configured an interface 36127664Sbms# (otherwise it would not have been able to mount the NFS root!) 37214518Srpaulo# 38127664Sbms# The following directories are scanned. Each sucessive directory overrides 39127664Sbms# (is merged into) the previous one. 40127664Sbms# 41127664Sbms# /conf/base universal base 42127664Sbms# /conf/default modified by a secondary universal base 43127664Sbms# /conf/${ipba} modified based on the assigned broadcast IP 44127664Sbms# /conf/${ip} modified based on the machine's assigned IP 45127664Sbms# 46127664Sbms# Each of these directories may contain any number of subdirectories which 47127664Sbms# represent directories in / on the diskless machine. The existance of 48127664Sbms# these subdirectories causes this script to create a MEMORY FILESYSTEM for 49127664Sbms# /<sub_directory_name>. For example, if /conf/base/etc exists then a 50147894Ssam# memory filesystem will be created for /etc. 51127664Sbms# 52127664Sbms# If a subdirectory contains the file 'diskless_remount' the contents of 53127664Sbms# the file is used to remount the subdirectory prior to it being copied to 54147894Ssam# the memory filesystem. For example, if /conf/base/etc/diskless_remount 55127664Sbms# contains the string 'my.server.com:/etc' then my.server.com:/etc will be 56127664Sbms# mounted in place of the subdirectory. This allows you to avoid making 57127664Sbms# duplicates of system directories in /conf. 58127664Sbms# 59127664Sbms# If a subdirectory contains the file 'md_size', the contents of the 60127664Sbms# file is used to determine the size of the memory filesystem, in 512 61127664Sbms# byte sectors. The default is 10240 (5MB). You only have to specify an 62127664Sbms# md_size if the default doesn't work for you (i.e. if it is too big or 63146768Ssam# too small). For example, /conf/base/etc/md_size might contain '16384'. 64235426Sdelphij# 65235426Sdelphij# If /conf/<special_dir>/SUBDIR.cpio.gz exists, the file is cpio'd into 66235426Sdelphij# the specified /SUBDIR (and a memory filesystem is created for /SUBDIR 67235426Sdelphij# if necessary). 68235426Sdelphij# 69172677Smlaier# If /conf/<special_dir>/SUBDIR.remove exists, the file contains a list 70214518Srpaulo# of paths which are rm -rf'd relative to /SUBDIR. 71214518Srpaulo# 72235426Sdelphij# You will almost universally want to create a /conf/base/etc containing 73214518Srpaulo# a diskless_remount and possibly an md_size file. You will then almost 74214518Srpaulo# universally want to override rc.conf, rc.local, and fstab by creating 75214518Srpaulo# /conf/default/etc/{rc.conf,rc.local,fstab}. Your fstab should be sure 76235426Sdelphij# to mount a /usr... typically an NFS readonly /usr. 77235426Sdelphij# 78235426Sdelphij# NOTE! /etc/rc.d/diskless will create /var, /tmp, and /dev. 79146768Ssam# Those filesystems should not be specified in /conf. At least not yet. 80127664Sbms 81127664Sbmsdlv=`/sbin/sysctl -n vfs.nfs.diskless_valid 2> /dev/null` 82127664Sbms[ ${dlv:=0} -eq 0 ] && exit 0 83127664Sbms 84127664Sbms# chkerr: 85127664Sbms# 86127664Sbms# Routine to check for error 87127664Sbms# 88127664Sbms# checks error code and drops into shell on failure. 89127664Sbms# if shell exits, terminates script as well as /etc/rc. 90127664Sbms# 91127664Sbmschkerr() { 92127664Sbms case $1 in 93127664Sbms 0) 94127664Sbms ;; 95127664Sbms *) 96127664Sbms echo "$2 failed: dropping into /bin/sh" 97127664Sbms /bin/sh 98127664Sbms # RESUME 99127664Sbms ;; 100127664Sbms esac 101127664Sbms} 102127664Sbms 103127664Sbms# Create a generic memory disk 104127664Sbms# 105127664Sbmsmount_md() { 106127664Sbms /sbin/mdmfs -i 4096 -s $1 -M md $2 107127664Sbms} 108127664Sbms 109127664Sbms# Create the memory filesystem if it has not already been created 110127664Sbms# 111127664Sbmscreate_md() { 112127664Sbms if [ "x`eval echo \\$md_created_$1`" = "x" ]; then 113127664Sbms if [ "x`eval echo \\$md_size_$1`" = "x" ]; then 114127664Sbms md_size=10240 115127664Sbms else 116127664Sbms md_size=`eval echo \\$md_size_$1` 117127664Sbms fi 118127664Sbms mount_md $md_size /$1 119127664Sbms /bin/chmod 755 /$1 120127664Sbms eval md_created_$1=created 121127664Sbms fi 122127664Sbms} 123146768Ssam 124146768Ssam# DEBUGGING 125146768Ssam# 126146768Ssam# set -v 127146768Ssam 128127664Sbms# Figure out our interface and IP. 129127664Sbms# 130127664Sbmsbootp_ifc="" 131127664Sbmsbootp_ipa="" 132127664Sbmsbootp_ipbca="" 133127664Sbmsiflist=`ifconfig -l` 134127664Sbmsfor i in ${iflist} ; do 135127664Sbms set `ifconfig ${i}` 136127664Sbms while [ $# -ge 1 ] ; do 137127664Sbms if [ "${bootp_ifc}" = "" -a "$1" = "inet" ] ; then 138127664Sbms bootp_ifc=${i} ; bootp_ipa=${2} ; shift 139127664Sbms fi 140127664Sbms if [ "${bootp_ipbca}" = "" -a "$1" = "broadcast" ] ; then 141127664Sbms bootp_ipbca=$2; shift 142127664Sbms fi 143127664Sbms shift 144127664Sbms done 145127664Sbms if [ "${bootp_ifc}" != "" ] ; then 146251129Sdelphij break 147127664Sbms fi 148127664Sbmsdone 149127664Sbmsecho "Interface ${bootp_ifc} IP-Address ${bootp_ipa} Broadcast ${bootp_ipbca}" 150127664Sbms 151127664Sbms# Figure out our NFS root path 152127664Sbms# 153147894Ssamset `mount -t nfs` 154127664Sbmswhile [ $# -ge 1 ] ; do 155127664Sbms if [ "$2" = "on" -a "$3" = "/" ]; then 156127664Sbms nfsroot="$1" 157127664Sbms break 158127664Sbms fi 159127664Sbms shift 160127664Sbmsdone 161127664Sbms 162127664Sbms# Resolve templates in /conf/base, /conf/default, /conf/${bootp_ipbca}, 163127664Sbms# and /conf/${bootp_ipa}. For each subdirectory found within these 164127664Sbms# directories: 165127664Sbms# 166127664Sbms# - calculate memory filesystem sizes. If the subdirectory (prior to 167127664Sbms# NFS remounting) contains the file 'md_size', the contents specified 168127664Sbms# in 512 byte sectors will be used to size the memory filesystem. Otherwise 169127664Sbms# 8192 sectors (4MB) is used. 170127664Sbms# 171127664Sbms# - handle NFS remounts. If the subdirectory contains the file 172127664Sbms# diskless_remount, the contents of the file is NFS mounted over 173127664Sbms# the directory. For example /conf/base/etc/diskless_remount 174127664Sbms# might contain 'myserver:/etc'. NFS remounts allow you to avoid 175127664Sbms# having to dup your system directories in /conf. Your server must 176127664Sbms# be sure to export those filesystems -alldirs, however. 177127664Sbms# If the diskless_remount file contains a string beginning with a 178127664Sbms# '/' it is assumed that the local nfsroot should be prepended to 179127664Sbms# it before attemping to the remount. This allows the root to be 180127664Sbms# relocated without needing to change the remount files. 181127664Sbms# 182127664Sbmsfor i in base default ${bootp_ipbca} ${bootp_ipa} ; do 183127664Sbms for j in /conf/$i/* ; do 184127664Sbms # memory filesystem size specification 185127664Sbms # 186127664Sbms subdir=${j##*/} 187127664Sbms if [ -d $j -a -f $j/md_size ]; then 188127664Sbms eval md_size_$subdir=`cat $j/md_size` 189127664Sbms fi 190127664Sbms 191127664Sbms # NFS remount 192127664Sbms # 193127664Sbms if [ -d $j -a -f $j/diskless_remount ]; then 194127664Sbms nfspt=`/bin/cat $j/diskless_remount` 195127664Sbms if [ `expr "$nfspt" : '\(.\)'` = "/" ]; then 196127664Sbms nfspt="${nfsroot}${nfspt}" 197127664Sbms fi 198127664Sbms mount_nfs $nfspt $j 199127664Sbms chkerr $? "mount_nfs $nfspt $j" 200127664Sbms fi 201127664Sbms done 202127664Sbmsdone 203127664Sbms 204127664Sbms# - Create all required MFS filesystems and populate them from 205127664Sbms# our templates. Support both a direct template and a dir.cpio.gz 206127664Sbms# archive. Support dir.remove files containing a list of relative 207127664Sbms# paths to remove. 208127664Sbms# 209127664Sbms# TODO: 210127664Sbms# + find a way to assign a 'group' identifier to a machine 211127664Sbms# so we can use group-specific configurations; 212127664Sbms 213127664Sbmsfor i in base default ${bootp_ipbca} ${bootp_ipa} ; do 214127664Sbms for j in /conf/$i/* ; do 215127664Sbms subdir=${j##*/} 216127664Sbms if [ -d $j ]; then 217127664Sbms create_md $subdir 218127664Sbms cp -Rp $j/* /$subdir 219127664Sbms fi 220127664Sbms done 221127664Sbms for j in /conf/$i/*.cpio.gz ; do 222127664Sbms subdir=${j%*.cpio.gz} 223127664Sbms subdir=${subdir##*/} 224127664Sbms if [ -f $j ]; then 225127664Sbms create_md $subdir 226127664Sbms echo "Loading /$subdir from cpio archive $j" 227127664Sbms (cd / ; /stand/gzip -d < $j | /stand/cpio --extract -d ) 228127664Sbms fi 229127664Sbms done 230127664Sbms for j in /conf/$i/*.remove ; do 231127664Sbms subdir=${j%*.remove} 232147894Ssam subdir=${subdir##*/} 233147894Ssam if [ -f $j ]; then 234147894Ssam # doubly sure it is a memory disk before rm -rf'ing 235147894Ssam create_md $subdir 236147894Ssam (cd /$subdir; rm -rf `/bin/cat $j`) 237147894Ssam fi 238147894Ssam done 239147894Ssamdone 240147894Ssam 241147894Ssam