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
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 $
30 # PROVIDE: initdiskless
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!)
41 # The following directories are scanned. Each successive directory overrides
42 # (is merged into) the previous one.
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
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.
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.
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'.
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
73 # If /conf/<special_dir>/SUBDIR.remove exists, the file contains a list
74 # of paths which are rm -rf'd relative to /SUBDIR.
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.
82 # NOTE! rc.diskless2 will create /var, /tmp, and /dev. Those filesystems
83 # should not be specified in /conf. At least not yet.
85 dlv=`/sbin/sysctl -n vfs.nfs.diskless_valid 2> /dev/null`
86 [ ${dlv:=0} -eq 0 ] && exit 0
90 # Routine to check for error
92 # checks error code and drops into shell on failure.
93 # if shell exits, terminates script as well as /etc/rc.
100 echo "$2 failed: dropping into /bin/sh"
107 # Create a generic memory disk
110 /sbin/mdmfs -i 4096 -s $1 -M md $2
113 # Create the memory filesystem if it has not already been created
116 if [ "x`eval echo \\$md_created_$1`" = "x" ]; then
117 if [ "x`eval echo \\$md_size_$1`" = "x" ]; then
120 md_size=`eval echo \\$md_size_$1`
122 mount_md $md_size /$1
124 eval md_created_$1=created
132 # Figure out our interface and IP.
138 for i in ${iflist} ; do
140 while [ $# -ge 1 ] ; do
141 if [ "${bootp_ifc}" = "" -a "$1" = "inet" ] ; then
142 bootp_ifc=${i} ; bootp_ipa=${2} ; shift
144 if [ "${bootp_ipbca}" = "" -a "$1" = "broadcast" ] ; then
145 bootp_ipbca=$2; shift
149 if [ "${bootp_ifc}" != "" ] ; then
153 echo "Interface ${bootp_ifc} IP-Address ${bootp_ipa} Broadcast ${bootp_ipbca}"
155 # Figure out our NFS root path
158 while [ $# -ge 1 ] ; do
159 if [ "$2" = "on" -a "$3" = "/" ]; then
166 # Resolve templates in /conf/base, /conf/default, /conf/${bootp_ipbca},
167 # and /conf/${bootp_ipa}. For each subdirectory found within these
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.
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.
186 for i in base default ${bootp_ipbca} ${bootp_ipa} ; do
187 for j in /conf/$i/* ; do
188 # memory filesystem size specification
191 if [ -d $j -a -f $j/md_size ]; then
192 eval md_size_$subdir=`cat $j/md_size`
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}"
203 chkerr $? "mount_nfs $nfspt $j"
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
214 # + find a way to assign a 'group' identifier to a machine
215 # so we can use group-specific configurations;
217 for i in base default ${bootp_ipbca} ${bootp_ipa} ; do
218 for j in /conf/$i/* ; do
225 for j in /conf/$i/*.cpio.gz ; do
226 subdir=${j%*.cpio.gz}
230 echo "Loading /$subdir from cpio archive $j"
231 (cd / ; /stand/gzip -d < $j | /stand/cpio --extract -d )
234 for j in /conf/$i/*.remove ; do
238 # doubly sure it is a memory disk before rm -rf'ing
240 (cd /$subdir; rm -rf `/bin/cat $j`)