1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
|
#!/bin/sh
#
# Copyright (c) 1999 Matt Dillion
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#
# $FreeBSD$
#
# PROVIDE: initdiskless
# KEYWORD: FreeBSD
# On entry to this script the entire system consists of a read-only root
# mounted via NFS. We use the contents of /conf to create and populate
# memory filesystems. The kernel has run BOOTP and configured an interface
# (otherwise it would not have been able to mount the NFS root!)
#
# The following directories are scanned. Each sucessive directory overrides
# (is merged into) the previous one.
#
# /conf/base universal base
# /conf/default modified by a secondary universal base
# /conf/${ipba} modified based on the assigned broadcast IP
# /conf/${ip} modified based on the machine's assigned IP
#
# Each of these directories may contain any number of subdirectories which
# represent directories in / on the diskless machine. The existance of
# these subdirectories causes this script to create a MEMORY FILESYSTEM for
# /<sub_directory_name>. For example, if /conf/base/etc exists then a
# memory filesystem will be created for /etc.
#
# If a subdirectory contains the file 'diskless_remount' the contents of
# the file is used to remount the subdirectory prior to it being copied to
# the memory filesystem. For example, if /conf/base/etc/diskless_remount
# contains the string 'my.server.com:/etc' then my.server.com:/etc will be
# mounted in place of the subdirectory. This allows you to avoid making
# duplicates of system directories in /conf.
#
# If a subdirectory contains the file 'md_size', the contents of the
# file is used to determine the size of the memory filesystem, in 512
# byte sectors. The default is 8192 (4MB). You only have to specify an
# md_size if the default doesn't work for you (i.e. if it is too big or
# too small). Note that in -current the default is 4096 (2MB). For
# example, /conf/base/etc/md_size might contain '16384'.
#
# If /conf/<special_dir>/SUBDIR.cpio.gz exists, the file is cpio'd into
# the specified /SUBDIR (and a memory filesystem is created for /SUBDIR
# if necessary).
#
# If /conf/<special_dir>/SUBDIR.remove exists, the file contains a list
# of paths which are rm -rf'd relative to /SUBDIR.
#
# You will almost universally want to create a /conf/base/etc containing
# a diskless_remount and possibly an md_size file. You will then almost
# universally want to override rc.conf, rc.local, and fstab by creating
# /conf/default/etc/{rc.conf,rc.local,fstab}. Your fstab should be sure
# to mount a /usr... typically an NFS readonly /usr.
#
# NOTE! rc.diskless2 will create /var, /tmp, and /dev. Those filesystems
# should not be specified in /conf. At least not yet.
dlv=`/sbin/sysctl -n vfs.nfs.diskless_valid 2> /dev/null`
[ ${dlv:=0} -eq 0 ] && exit 0
# chkerr:
#
# Routine to check for error
#
# checks error code and drops into shell on failure.
# if shell exits, terminates script as well as /etc/rc.
#
chkerr() {
case $1 in
0)
;;
*)
echo "$2 failed: dropping into /bin/sh"
/bin/sh
# RESUME
;;
esac
}
# Create a generic memory disk
#
mount_md() {
/sbin/mdmfs -i 4096 -s $1 -M md $2
}
# Create the memory filesystem if it has not already been created
#
create_md() {
if [ "x`eval echo \\$md_created_$1`" = "x" ]; then
if [ "x`eval echo \\$md_size_$1`" = "x" ]; then
md_size=4096
else
md_size=`eval echo \\$md_size_$1`
fi
mount_md $md_size /$1
/bin/chmod 755 /$1
eval md_created_$1=created
fi
}
# DEBUGGING
#
# set -v
# Figure out our interface and IP.
#
bootp_ifc=""
bootp_ipa=""
bootp_ipbca=""
iflist=`ifconfig -l`
for i in ${iflist} ; do
set `ifconfig ${i}`
while [ $# -ge 1 ] ; do
if [ "${bootp_ifc}" = "" -a "$1" = "inet" ] ; then
bootp_ifc=${i} ; bootp_ipa=${2} ; shift
fi
if [ "${bootp_ipbca}" = "" -a "$1" = "broadcast" ] ; then
bootp_ipbca=$2; shift
fi
shift
done
if [ "${bootp_ifc}" != "" ] ; then
break
fi
done
echo "Interface ${bootp_ifc} IP-Address ${bootp_ipa} Broadcast ${bootp_ipbca}"
# Figure out our NFS root path
#
set `mount -t nfs`
while [ $# -ge 1 ] ; do
if [ "$2" = "on" -a "$3" = "/" ]; then
nfsroot="$1"
break
fi
shift
done
# Resolve templates in /conf/base, /conf/default, /conf/${bootp_ipbca},
# and /conf/${bootp_ipa}. For each subdirectory found within these
# directories:
#
# - calculate memory filesystem sizes. If the subdirectory (prior to
# NFS remounting) contains the file 'md_size', the contents specified
# in 512 byte sectors will be used to size the memory filesystem. Otherwise
# 8192 sectors (4MB) is used.
#
# - handle NFS remounts. If the subdirectory contains the file
# diskless_remount, the contents of the file is NFS mounted over
# the directory. For example /conf/base/etc/diskless_remount
# might contain 'myserver:/etc'. NFS remounts allow you to avoid
# having to dup your system directories in /conf. Your server must
# be sure to export those filesystems -alldirs, however.
# If the diskless_remount file contains a string beginning with a
# '/' it is assumed that the local nfsroot should be prepended to
# it before attemping to the remount. This allows the root to be
# relocated without needing to change the remount files.
#
for i in base default ${bootp_ipbca} ${bootp_ipa} ; do
for j in /conf/$i/* ; do
# memory filesystem size specification
#
subdir=${j##*/}
if [ -d $j -a -f $j/md_size ]; then
eval md_size_$subdir=`cat $j/md_size`
fi
# NFS remount
#
if [ -d $j -a -f $j/diskless_remount ]; then
nfspt=`/bin/cat $j/diskless_remount`
if [ `expr "$nfspt" : '\(.\)'` = "/" ]; then
nfspt="${nfsroot}${nfspt}"
fi
mount_nfs $nfspt $j
chkerr $? "mount_nfs $nfspt $j"
fi
done
done
# - Create all required MFS filesystems and populate them from
# our templates. Support both a direct template and a dir.cpio.gz
# archive. Support dir.remove files containing a list of relative
# paths to remove.
#
# TODO:
# + find a way to assign a 'group' identifier to a machine
# so we can use group-specific configurations;
for i in base default ${bootp_ipbca} ${bootp_ipa} ; do
for j in /conf/$i/* ; do
subdir=${j##*/}
if [ -d $j ]; then
create_md $subdir
cp -Rp $j/* /$subdir
fi
done
for j in /conf/$i/*.cpio.gz ; do
subdir=${j%*.cpio.gz}
subdir=${subdir##*/}
if [ -f $j ]; then
create_md $subdir
echo "Loading /$subdir from cpio archive $j"
(cd / ; /stand/gzip -d < $j | /stand/cpio --extract -d )
fi
done
for j in /conf/$i/*.remove ; do
subdir=${j%*.remove}
subdir=${subdir##*/}
if [ -f $j ]; then
# doubly sure it is a memory disk before rm -rf'ing
create_md $subdir
(cd /$subdir; rm -rf `/bin/cat $j`)
fi
done
done
|
