| 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 1.8 2007/04/26 23:34:27 dillon Exp $ |
| 29 | # |
| 30 | # PROVIDE: initdiskless |
| 31 | |
| 32 | . /etc/rc.subr |
| 33 | dummy_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 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 | |
| 83 | dlv=`/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 | # |
| 93 | chkerr() { |
| 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 | # |
| 107 | mount_md() { |
| 108 | /sbin/mount_mfs -i 4096 -s $1 swap $2 |
| 109 | } |
| 110 | |
| 111 | # Create the memory filesystem if it has not already been created |
| 112 | # |
| 113 | create_md() { |
| 114 | if [ "x`eval echo \\$md_created_$1`" = "x" ]; then |
| 115 | if [ "x`eval echo \\$md_size_$1`" = "x" ]; then |
| 116 | md_size=4096 |
| 117 | else |
| 118 | md_size=`eval echo \\$md_size_$1` |
| 119 | fi |
| 120 | mount_md $md_size /$1 |
| 121 | /bin/chmod 755 /$1 |
| 122 | eval md_created_$1=created |
| 123 | fi |
| 124 | } |
| 125 | |
| 126 | # DEBUGGING |
| 127 | # |
| 128 | # set -v |
| 129 | |
| 130 | # Figure out our interface and IP. |
| 131 | # |
| 132 | bootp_ifc="" |
| 133 | bootp_ipa="" |
| 134 | bootp_ipbca="" |
| 135 | iflist=`ifconfig -l` |
| 136 | for i in ${iflist} ; do |
| 137 | set `ifconfig ${i}` |
| 138 | while [ $# -ge 1 ] ; do |
| 139 | if [ "${bootp_ifc}" = "" -a "$1" = "inet" ] ; then |
| 140 | bootp_ifc=${i} ; bootp_ipa=${2} ; shift |
| 141 | fi |
| 142 | if [ "${bootp_ipbca}" = "" -a "$1" = "broadcast" ] ; then |
| 143 | bootp_ipbca=$2; shift |
| 144 | fi |
| 145 | shift |
| 146 | done |
| 147 | if [ "${bootp_ifc}" != "" ] ; then |
| 148 | break |
| 149 | fi |
| 150 | done |
| 151 | echo "Interface ${bootp_ifc} IP-Address ${bootp_ipa} Broadcast ${bootp_ipbca}" |
| 152 | |
| 153 | # Figure out our NFS root path |
| 154 | # |
| 155 | set `mount -t nfs` |
| 156 | while [ $# -ge 1 ] ; do |
| 157 | if [ "$2" = "on" -a "$3" = "/" ]; then |
| 158 | nfsroot="$1" |
| 159 | break |
| 160 | fi |
| 161 | shift |
| 162 | done |
| 163 | |
| 164 | # Resolve templates in /conf/base, /conf/default, /conf/${bootp_ipbca}, |
| 165 | # and /conf/${bootp_ipa}. For each subdirectory found within these |
| 166 | # directories: |
| 167 | # |
| 168 | # - calculate memory filesystem sizes. If the subdirectory (prior to |
| 169 | # NFS remounting) contains the file 'md_size', the contents specified |
| 170 | # in 512 byte sectors will be used to size the memory filesystem. |
| 171 | # |
| 172 | # - handle NFS remounts. If the subdirectory contains the file |
| 173 | # diskless_remount, the contents of the file is NFS mounted over |
| 174 | # the directory. For example /conf/base/etc/diskless_remount |
| 175 | # might contain 'myserver:/etc'. NFS remounts allow you to avoid |
| 176 | # having to dup your system directories in /conf. Your server must |
| 177 | # be sure to export those filesystems -alldirs, however. |
| 178 | # If the diskless_remount file contains a string beginning with a |
| 179 | # '/' it is assumed that the local nfsroot should be prepended to |
| 180 | # it before attemping to the remount. This allows the root to be |
| 181 | # relocated without needing to change the remount files. |
| 182 | # |
| 183 | for i in base default ${bootp_ipbca} ${bootp_ipa} ; do |
| 184 | for j in /conf/$i/* ; do |
| 185 | # memory filesystem size specification |
| 186 | # |
| 187 | subdir=${j##*/} |
| 188 | if [ -d $j -a -f $j/md_size ]; then |
| 189 | eval md_size_$subdir=`cat $j/md_size` |
| 190 | fi |
| 191 | |
| 192 | # NFS remount |
| 193 | # |
| 194 | if [ -d $j -a -f $j/diskless_remount ]; then |
| 195 | nfspt=`/bin/cat $j/diskless_remount` |
| 196 | if [ `expr "$nfspt" : '\(.\)'` = "/" ]; then |
| 197 | nfspt="${nfsroot}${nfspt}" |
| 198 | fi |
| 199 | mount_nfs $nfspt $j |
| 200 | chkerr $? "mount_nfs $nfspt $j" |
| 201 | fi |
| 202 | done |
| 203 | done |
| 204 | |
| 205 | # - Create all required MFS filesystems and populate them from |
| 206 | # our templates. Support both a direct template and a dir.cpio.gz |
| 207 | # archive. Support dir.remove files containing a list of relative |
| 208 | # paths to remove. |
| 209 | # |
| 210 | # TODO: |
| 211 | # + find a way to assign a 'group' identifier to a machine |
| 212 | # so we can use group-specific configurations; |
| 213 | |
| 214 | for i in base default ${bootp_ipbca} ${bootp_ipa} ; do |
| 215 | for j in /conf/$i/* ; do |
| 216 | subdir=${j##*/} |
| 217 | if [ -d $j ]; then |
| 218 | create_md $subdir |
| 219 | cp -Rp $j/* /$subdir |
| 220 | fi |
| 221 | done |
| 222 | for j in /conf/$i/*.cpio.gz ; do |
| 223 | subdir=${j%*.cpio.gz} |
| 224 | subdir=${subdir##*/} |
| 225 | if [ -f $j ]; then |
| 226 | create_md $subdir |
| 227 | echo "Loading /$subdir from cpio archive $j" |
| 228 | (cd / ; /usr/bin/gzip -d < $j | /usr/bin/cpio --extract -d ) |
| 229 | fi |
| 230 | done |
| 231 | for j in /conf/$i/*.remove ; do |
| 232 | subdir=${j%*.remove} |
| 233 | subdir=${subdir##*/} |
| 234 | if [ -f $j ]; then |
| 235 | # doubly sure it is a memory disk before rm -rf'ing |
| 236 | create_md $subdir |
| 237 | (cd /$subdir; rm -rf `/bin/cat $j`) |
| 238 | fi |
| 239 | done |
| 240 | done |