rc.initdiskless revision 126787
1100280Sgordon#!/bin/sh 2100280Sgordon# 3118638Sfjoe# Copyright (c) 1999 Matt Dillon 466830Sobrien# All rights reserved. 566830Sobrien# 666830Sobrien# Redistribution and use in source and binary forms, with or without 766830Sobrien# modification, are permitted provided that the following conditions 866830Sobrien# are met: 966830Sobrien# 1. Redistributions of source code must retain the above copyright 1066830Sobrien# notice, this list of conditions and the following disclaimer. 1166830Sobrien# 2. Redistributions in binary form must reproduce the above copyright 1266830Sobrien# notice, this list of conditions and the following disclaimer in the 1366830Sobrien# documentation and/or other materials provided with the distribution. 1466830Sobrien# 1566830Sobrien# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 1666830Sobrien# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 1766830Sobrien# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 1866830Sobrien# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 1966830Sobrien# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2066830Sobrien# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2166830Sobrien# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2266830Sobrien# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2366830Sobrien# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2466830Sobrien# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2566830Sobrien# SUCH DAMAGE. 2666830Sobrien# 2751231Ssheldonh# $FreeBSD: head/etc/rc.initdiskless 126787 2004-03-09 23:06:50Z phk $ 2851231Ssheldonh# 29100280Sgordon# PROVIDE: initdiskless 30126744Spjd# KEYWORD: FreeBSD nojail 31100280Sgordon 32121067Sdougb 33108191Sdillon# On entry to this script the entire system consists of a read-only root 34108191Sdillon# mounted via NFS. We use the contents of /conf to create and populate 35108191Sdillon# memory filesystems. The kernel has run BOOTP and configured an interface 36108191Sdillon# (otherwise it would not have been able to mount the NFS root!) 37108191Sdillon# 38108191Sdillon# The following directories are scanned. Each sucessive directory overrides 39108191Sdillon# (is merged into) the previous one. 40108191Sdillon# 41108191Sdillon# /conf/base universal base 42108191Sdillon# /conf/default modified by a secondary universal base 43108191Sdillon# /conf/${ipba} modified based on the assigned broadcast IP 44108191Sdillon# /conf/${ip} modified based on the machine's assigned IP 45108191Sdillon# 46108191Sdillon# Each of these directories may contain any number of subdirectories which 47108191Sdillon# represent directories in / on the diskless machine. The existance of 48108191Sdillon# these subdirectories causes this script to create a MEMORY FILESYSTEM for 49108191Sdillon# /<sub_directory_name>. For example, if /conf/base/etc exists then a 50108191Sdillon# memory filesystem will be created for /etc. 51108191Sdillon# 52126787Sphk# If a subdirectory contains the file 'remount' the contents of the file 53126787Sphk# is a mount command used to remount the subdirectory prior to it being 54126787Sphk# copied. An example contents could be: "mount -o ro /dev/ad0s3". Note 55126787Sphk# that the directory to be mounted on is supplied by this script. 56126787Sphk# 57108191Sdillon# If a subdirectory contains the file 'diskless_remount' the contents of 58108191Sdillon# the file is used to remount the subdirectory prior to it being copied to 59108191Sdillon# the memory filesystem. For example, if /conf/base/etc/diskless_remount 60108191Sdillon# contains the string 'my.server.com:/etc' then my.server.com:/etc will be 61108191Sdillon# mounted in place of the subdirectory. This allows you to avoid making 62126787Sphk# duplicates of system directories in /conf. Special processing is done 63126787Sphk# to allow specifications relative to the root filesystem. 64108191Sdillon# 65108191Sdillon# If a subdirectory contains the file 'md_size', the contents of the 66108191Sdillon# file is used to determine the size of the memory filesystem, in 512 67121014Skris# byte sectors. The default is 10240 (5MB). You only have to specify an 68108191Sdillon# md_size if the default doesn't work for you (i.e. if it is too big or 69121014Skris# too small). For example, /conf/base/etc/md_size might contain '16384'. 70108191Sdillon# 71108191Sdillon# If /conf/<special_dir>/SUBDIR.cpio.gz exists, the file is cpio'd into 72108191Sdillon# the specified /SUBDIR (and a memory filesystem is created for /SUBDIR 73108191Sdillon# if necessary). 74108191Sdillon# 75108191Sdillon# If /conf/<special_dir>/SUBDIR.remove exists, the file contains a list 76108191Sdillon# of paths which are rm -rf'd relative to /SUBDIR. 77108191Sdillon# 78108191Sdillon# You will almost universally want to create a /conf/base/etc containing 79108191Sdillon# a diskless_remount and possibly an md_size file. You will then almost 80108191Sdillon# universally want to override rc.conf, rc.local, and fstab by creating 81108191Sdillon# /conf/default/etc/{rc.conf,rc.local,fstab}. Your fstab should be sure 82108191Sdillon# to mount a /usr... typically an NFS readonly /usr. 83108191Sdillon# 84121066Sdougb# NOTE! /etc/rc.d/diskless will create /var, /tmp, and /dev. 85121066Sdougb# Those filesystems should not be specified in /conf. At least not yet. 86108191Sdillon 87100280Sgordondlv=`/sbin/sysctl -n vfs.nfs.diskless_valid 2> /dev/null` 88126787Sphk[ ${dlv:=0} -eq 0 ] && [ ! -f /etc/diskless ] && exit 0 89100280Sgordon 9043803Sdillon# chkerr: 9143803Sdillon# 9243803Sdillon# Routine to check for error 9343803Sdillon# 9443803Sdillon# checks error code and drops into shell on failure. 9543803Sdillon# if shell exits, terminates script as well as /etc/rc. 9651231Ssheldonh# 97108191Sdillonchkerr() { 98108191Sdillon case $1 in 99108191Sdillon 0) 100108191Sdillon ;; 101108191Sdillon *) 102108191Sdillon echo "$2 failed: dropping into /bin/sh" 103108191Sdillon /bin/sh 104108191Sdillon # RESUME 105108191Sdillon ;; 106108191Sdillon esac 10743803Sdillon} 10843803Sdillon 109108191Sdillon# Create a generic memory disk 110108191Sdillon# 111108191Sdillonmount_md() { 112108191Sdillon /sbin/mdmfs -i 4096 -s $1 -M md $2 11375931Simp} 11475931Simp 115108191Sdillon# Create the memory filesystem if it has not already been created 116108191Sdillon# 117108191Sdilloncreate_md() { 118108191Sdillon if [ "x`eval echo \\$md_created_$1`" = "x" ]; then 119110942Sjhay if [ "x`eval echo \\$md_size_$1`" = "x" ]; then 120121014Skris md_size=10240 121108191Sdillon else 122108191Sdillon md_size=`eval echo \\$md_size_$1` 123108191Sdillon fi 124108191Sdillon mount_md $md_size /$1 125108191Sdillon /bin/chmod 755 /$1 126108191Sdillon eval md_created_$1=created 127108191Sdillon fi 128108191Sdillon} 129108191Sdillon 13043803Sdillon# DEBUGGING 13143803Sdillon# 13255520Sluigi# set -v 13343803Sdillon 13451231Ssheldonh# Figure out our interface and IP. 13543803Sdillon# 13655520Sluigibootp_ifc="" 13755520Sluigibootp_ipa="" 13855520Sluigibootp_ipbca="" 139126787Sphkif [ ${dlv:=0} -ne 0 ] ; then 140126787Sphk iflist=`ifconfig -l` 141126787Sphk for i in ${iflist} ; do 142126787Sphk set `ifconfig ${i}` 143126787Sphk while [ $# -ge 1 ] ; do 144126787Sphk if [ "${bootp_ifc}" = "" -a "$1" = "inet" ] ; then 145126787Sphk bootp_ifc=${i} ; bootp_ipa=${2} ; shift 146126787Sphk fi 147126787Sphk if [ "${bootp_ipbca}" = "" -a "$1" = "broadcast" ] ; then 148126787Sphk bootp_ipbca=$2; shift 149126787Sphk fi 150126787Sphk shift 151126787Sphk done 152126787Sphk if [ "${bootp_ifc}" != "" ] ; then 153126787Sphk break 154126787Sphk fi 155126787Sphk done 156126787Sphk echo "Interface ${bootp_ifc} IP-Address ${bootp_ipa} Broadcast ${bootp_ipbca}" 157126787Sphkfi 15843803Sdillon 159117087Sbrooks# Figure out our NFS root path 160121067Sdougb# 161117087Sbrooksset `mount -t nfs` 162117087Sbrookswhile [ $# -ge 1 ] ; do 163117087Sbrooks if [ "$2" = "on" -a "$3" = "/" ]; then 164117087Sbrooks nfsroot="$1" 165117087Sbrooks break 166117087Sbrooks fi 167117087Sbrooks shift 168117087Sbrooksdone 169117087Sbrooks 170108191Sdillon# Resolve templates in /conf/base, /conf/default, /conf/${bootp_ipbca}, 171121067Sdougb# and /conf/${bootp_ipa}. For each subdirectory found within these 172108191Sdillon# directories: 17343803Sdillon# 174108191Sdillon# - calculate memory filesystem sizes. If the subdirectory (prior to 175108191Sdillon# NFS remounting) contains the file 'md_size', the contents specified 176108191Sdillon# in 512 byte sectors will be used to size the memory filesystem. Otherwise 177108191Sdillon# 8192 sectors (4MB) is used. 178108191Sdillon# 179108191Sdillon# - handle NFS remounts. If the subdirectory contains the file 180108191Sdillon# diskless_remount, the contents of the file is NFS mounted over 181108191Sdillon# the directory. For example /conf/base/etc/diskless_remount 182108191Sdillon# might contain 'myserver:/etc'. NFS remounts allow you to avoid 183108191Sdillon# having to dup your system directories in /conf. Your server must 184108191Sdillon# be sure to export those filesystems -alldirs, however. 185117087Sbrooks# If the diskless_remount file contains a string beginning with a 186117087Sbrooks# '/' it is assumed that the local nfsroot should be prepended to 187117087Sbrooks# it before attemping to the remount. This allows the root to be 188117087Sbrooks# relocated without needing to change the remount files. 189108191Sdillon# 190108191Sdillonfor i in base default ${bootp_ipbca} ${bootp_ipa} ; do 191108191Sdillon for j in /conf/$i/* ; do 192108191Sdillon # memory filesystem size specification 193108191Sdillon # 194108191Sdillon subdir=${j##*/} 195108191Sdillon if [ -d $j -a -f $j/md_size ]; then 196108191Sdillon eval md_size_$subdir=`cat $j/md_size` 197108191Sdillon fi 19843803Sdillon 199126787Sphk # remount 200126787Sphk # 201126787Sphk if [ -d $j -a -f $j/remount ]; then 202126787Sphk nfspt=`/bin/cat $j/remount` 203126787Sphk $nfspt $j 204126787Sphk chkerr $? "$nfspt $j" 205126787Sphk fi 206126787Sphk 207108191Sdillon # NFS remount 208108191Sdillon # 209108191Sdillon if [ -d $j -a -f $j/diskless_remount ]; then 210108191Sdillon nfspt=`/bin/cat $j/diskless_remount` 211117087Sbrooks if [ `expr "$nfspt" : '\(.\)'` = "/" ]; then 212117087Sbrooks nfspt="${nfsroot}${nfspt}" 213117087Sbrooks fi 214108191Sdillon mount_nfs $nfspt $j 215108191Sdillon chkerr $? "mount_nfs $nfspt $j" 21675746Sbsd fi 217108191Sdillon done 21875746Sbsddone 21975746Sbsd 220108191Sdillon# - Create all required MFS filesystems and populate them from 221108191Sdillon# our templates. Support both a direct template and a dir.cpio.gz 222108191Sdillon# archive. Support dir.remove files containing a list of relative 223108191Sdillon# paths to remove. 22495280Sobrien# 225108191Sdillon# TODO: 226108191Sdillon# + find a way to assign a 'group' identifier to a machine 227108191Sdillon# so we can use group-specific configurations; 22895280Sobrien 229108191Sdillonfor i in base default ${bootp_ipbca} ${bootp_ipa} ; do 230108191Sdillon for j in /conf/$i/* ; do 231108191Sdillon subdir=${j##*/} 232108191Sdillon if [ -d $j ]; then 233108191Sdillon create_md $subdir 234108191Sdillon cp -Rp $j/* /$subdir 235108191Sdillon fi 236108191Sdillon done 237108191Sdillon for j in /conf/$i/*.cpio.gz ; do 238108191Sdillon subdir=${j%*.cpio.gz} 239108191Sdillon subdir=${subdir##*/} 240108191Sdillon if [ -f $j ]; then 241108191Sdillon create_md $subdir 242108191Sdillon echo "Loading /$subdir from cpio archive $j" 243108191Sdillon (cd / ; /stand/gzip -d < $j | /stand/cpio --extract -d ) 244108191Sdillon fi 245108191Sdillon done 246108191Sdillon for j in /conf/$i/*.remove ; do 247108191Sdillon subdir=${j%*.remove} 248108191Sdillon subdir=${subdir##*/} 249108191Sdillon if [ -f $j ]; then 250108191Sdillon # doubly sure it is a memory disk before rm -rf'ing 251108191Sdillon create_md $subdir 252108191Sdillon (cd /$subdir; rm -rf `/bin/cat $j`) 253108191Sdillon fi 254108191Sdillon done 255108191Sdillondone 256104334Sdd 257