3 # Copyright (c) 1999 Matt Dillon
6 # Redistribution and use in source and binary forms, with or without
7 # modification, are permitted provided that the following conditions
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.
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
29 # PROVIDE: initdiskless
33 # On entry to this script the entire system consists of a read-only root
34 # mounted via NFS. We use the contents of /conf to create and populate
35 # memory filesystems. The kernel has run BOOTP and configured an interface
36 # (otherwise it would not have been able to mount the NFS root!)
38 # The following directories are scanned. Each sucessive directory overrides
39 # (is merged into) the previous one.
41 # /conf/base universal base
42 # /conf/default modified by a secondary universal base
43 # /conf/${ipba} modified based on the assigned broadcast IP
44 # /conf/${ip} modified based on the machine's assigned IP
46 # Each of these directories may contain any number of subdirectories which
47 # represent directories in / on the diskless machine. The existance of
48 # these subdirectories causes this script to create a MEMORY FILESYSTEM for
49 # /<sub_directory_name>. For example, if /conf/base/etc exists then a
50 # memory filesystem will be created for /etc.
52 # If a subdirectory contains the file 'diskless_remount' the contents of
53 # the file is used to remount the subdirectory prior to it being copied to
54 # the memory filesystem. For example, if /conf/base/etc/diskless_remount
55 # contains the string 'my.server.com:/etc' then my.server.com:/etc will be
56 # mounted in place of the subdirectory. This allows you to avoid making
57 # duplicates of system directories in /conf.
59 # If a subdirectory contains the file 'md_size', the contents of the
60 # file is used to determine the size of the memory filesystem, in 512
61 # byte sectors. The default is 10240 (5MB). You only have to specify an
62 # md_size if the default doesn't work for you (i.e. if it is too big or
63 # too small). For example, /conf/base/etc/md_size might contain '16384'.
65 # If /conf/<special_dir>/SUBDIR.cpio.gz exists, the file is cpio'd into
66 # the specified /SUBDIR (and a memory filesystem is created for /SUBDIR
69 # If /conf/<special_dir>/SUBDIR.remove exists, the file contains a list
70 # of paths which are rm -rf'd relative to /SUBDIR.
72 # You will almost universally want to create a /conf/base/etc containing
73 # a diskless_remount and possibly an md_size file. You will then almost
74 # universally want to override rc.conf, rc.local, and fstab by creating
75 # /conf/default/etc/{rc.conf,rc.local,fstab}. Your fstab should be sure
76 # to mount a /usr... typically an NFS readonly /usr.
78 # NOTE! /etc/rc.d/diskless will create /var, /tmp, and /dev.
79 # Those filesystems should not be specified in /conf. At least not yet.
81 dlv=`/sbin/sysctl -n vfs.nfs.diskless_valid 2> /dev/null`
82 [ ${dlv:=0} -eq 0 ] && exit 0
86 # Routine to check for error
88 # checks error code and drops into shell on failure.
89 # if shell exits, terminates script as well as /etc/rc.
96 echo "$2 failed: dropping into /bin/sh"
103 # Create a generic memory disk
106 /sbin/mdmfs -i 4096 -s $1 -M md $2
109 # Create the memory filesystem if it has not already been created
112 if [ "x`eval echo \\$md_created_$1`" = "x" ]; then
113 if [ "x`eval echo \\$md_size_$1`" = "x" ]; then
116 md_size=`eval echo \\$md_size_$1`
118 mount_md $md_size /$1
120 eval md_created_$1=created
128 # Figure out our interface and IP.
134 for i in ${iflist} ; do
136 while [ $# -ge 1 ] ; do
137 if [ "${bootp_ifc}" = "" -a "$1" = "inet" ] ; then
138 bootp_ifc=${i} ; bootp_ipa=${2} ; shift
140 if [ "${bootp_ipbca}" = "" -a "$1" = "broadcast" ] ; then
141 bootp_ipbca=$2; shift
145 if [ "${bootp_ifc}" != "" ] ; then
149 echo "Interface ${bootp_ifc} IP-Address ${bootp_ipa} Broadcast ${bootp_ipbca}"
151 # Figure out our NFS root path
154 while [ $# -ge 1 ] ; do
155 if [ "$2" = "on" -a "$3" = "/" ]; then
162 # Resolve templates in /conf/base, /conf/default, /conf/${bootp_ipbca},
163 # and /conf/${bootp_ipa}. For each subdirectory found within these
166 # - calculate memory filesystem sizes. If the subdirectory (prior to
167 # NFS remounting) contains the file 'md_size', the contents specified
168 # in 512 byte sectors will be used to size the memory filesystem. Otherwise
169 # 8192 sectors (4MB) is used.
171 # - handle NFS remounts. If the subdirectory contains the file
172 # diskless_remount, the contents of the file is NFS mounted over
173 # the directory. For example /conf/base/etc/diskless_remount
174 # might contain 'myserver:/etc'. NFS remounts allow you to avoid
175 # having to dup your system directories in /conf. Your server must
176 # be sure to export those filesystems -alldirs, however.
177 # If the diskless_remount file contains a string beginning with a
178 # '/' it is assumed that the local nfsroot should be prepended to
179 # it before attemping to the remount. This allows the root to be
180 # relocated without needing to change the remount files.
182 for i in base default ${bootp_ipbca} ${bootp_ipa} ; do
183 for j in /conf/$i/* ; do
184 # memory filesystem size specification
187 if [ -d $j -a -f $j/md_size ]; then
188 eval md_size_$subdir=`cat $j/md_size`
193 if [ -d $j -a -f $j/diskless_remount ]; then
194 nfspt=`/bin/cat $j/diskless_remount`
195 if [ `expr "$nfspt" : '\(.\)'` = "/" ]; then
196 nfspt="${nfsroot}${nfspt}"
199 chkerr $? "mount_nfs $nfspt $j"
204 # - Create all required MFS filesystems and populate them from
205 # our templates. Support both a direct template and a dir.cpio.gz
206 # archive. Support dir.remove files containing a list of relative
210 # + find a way to assign a 'group' identifier to a machine
211 # so we can use group-specific configurations;
213 for i in base default ${bootp_ipbca} ${bootp_ipa} ; do
214 for j in /conf/$i/* ; do
221 for j in /conf/$i/*.cpio.gz ; do
222 subdir=${j%*.cpio.gz}
226 echo "Loading /$subdir from cpio archive $j"
227 (cd / ; /stand/gzip -d < $j | /stand/cpio --extract -d )
230 for j in /conf/$i/*.remove ; do
234 # doubly sure it is a memory disk before rm -rf'ing
236 (cd /$subdir; rm -rf `/bin/cat $j`)