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eb960fea DL |
1 | #!/bin/bash |
2 | ||
3 | # | |
4 | # lxc: linux Container library | |
5 | ||
6 | # Authors: | |
7 | # Daniel Lezcano <daniel.lezcano@free.fr> | |
8 | ||
9 | # This library is free software; you can redistribute it and/or | |
10 | # modify it under the terms of the GNU Lesser General Public | |
11 | # License as published by the Free Software Foundation; either | |
12 | # version 2.1 of the License, or (at your option) any later version. | |
13 | ||
14 | # This library is distributed in the hope that it will be useful, | |
15 | # but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
17 | # Lesser General Public License for more details. | |
18 | ||
19 | # You should have received a copy of the GNU Lesser General Public | |
20 | # License along with this library; if not, write to the Free Software | |
21 | # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
22 | ||
23 | install_busybox() | |
24 | { | |
25 | rootfs=$1 | |
26 | name=$2 | |
27 | res=0 | |
28 | tree="\ | |
32b37181 | 29 | $rootfs/selinux \ |
eb960fea DL |
30 | $rootfs/dev \ |
31 | $rootfs/home \ | |
32 | $rootfs/root \ | |
33 | $rootfs/etc \ | |
34 | $rootfs/etc/init.d \ | |
35 | $rootfs/bin \ | |
36 | $rootfs/sbin \ | |
37 | $rootfs/proc \ | |
38 | $rootfs/mnt \ | |
39 | $rootfs/tmp \ | |
40 | $rootfs/var/log \ | |
41 | $rootfs/usr/share/udhcpc \ | |
10e657e5 | 42 | $rootfs/dev/pts \ |
bf6cc736 DL |
43 | $rootfs/dev/shm \ |
44 | $rootfs/lib \ | |
45 | $rootfs/usr/lib \ | |
46 | $rootfs/lib64 \ | |
47 | $rootfs/usr/lib64" | |
eb960fea DL |
48 | |
49 | mkdir -p $tree || return 1 | |
50 | chmod 755 $tree || return 1 | |
51 | ||
52 | pushd $rootfs/dev > /dev/null || return 1 | |
53 | ||
54 | # minimal devices needed for busybox | |
55 | mknod tty c 5 0 || res=1 | |
56 | mknod console c 5 1 || res=1 | |
57 | chmod 666 tty console || res=1 | |
58 | mknod tty0 c 4 0 || res=1 | |
59 | mknod tty1 c 4 0 || res=1 | |
60 | mknod tty5 c 4 0 || res=1 | |
61 | chmod 666 tty0 || res=1 | |
62 | mknod ram0 b 1 0 || res=1 | |
63 | chmod 600 ram0 || res=1 | |
64 | mknod null c 1 3 || res=1 | |
65 | chmod 666 null || res=1 | |
66 | ||
67 | popd > /dev/null | |
68 | ||
69 | # root user defined | |
70 | cat <<EOF >> $rootfs/etc/passwd | |
71 | root:x:0:0:root:/root:/bin/sh | |
72 | EOF | |
73 | ||
74 | cat <<EOF >> $rootfs/etc/group | |
75 | root:x:0:root | |
76 | EOF | |
77 | ||
eb960fea DL |
78 | # mount everything |
79 | cat <<EOF >> $rootfs/etc/init.d/rcS | |
80 | #!/bin/sh | |
b09ecaf3 DL |
81 | /bin/syslogd |
82 | /bin/mount -a | |
83 | /bin/udhcpc | |
eb960fea DL |
84 | EOF |
85 | ||
86 | # executable | |
87 | chmod 744 $rootfs/etc/init.d/rcS || return 1 | |
88 | ||
89 | # mount points | |
90 | cat <<EOF >> $rootfs/etc/fstab | |
91 | proc /proc proc defaults 0 0 | |
92 | shm /dev/shm tmpfs defaults 0 0 | |
93 | EOF | |
94 | ||
95 | # writable and readable for other | |
96 | chmod 644 $rootfs/etc/fstab || return 1 | |
97 | ||
98 | # launch rcS first then make a console available | |
99 | # and propose a shell on the tty, the last one is | |
100 | # not needed | |
101 | cat <<EOF >> $rootfs/etc/inittab | |
102 | ::sysinit:/etc/init.d/rcS | |
0016af97 DL |
103 | tty1::respawn:/bin/getty -L tty1 115200 vt100 |
104 | console::askfirst:/bin/sh | |
eb960fea DL |
105 | EOF |
106 | # writable and readable for other | |
107 | chmod 644 $rootfs/etc/inittab || return 1 | |
108 | ||
109 | cat <<EOF >> $rootfs/usr/share/udhcpc/default.script | |
110 | #!/bin/sh | |
eb960fea | 111 | case "\$1" in |
14d9c0f0 SG |
112 | deconfig) |
113 | ip addr flush dev \$interface | |
114 | ;; | |
115 | ||
116 | renew|bound) | |
117 | # flush all the routes | |
118 | if [ -n "\$router" ]; then | |
119 | ip route del default 2> /dev/null | |
120 | fi | |
121 | ||
122 | # check broadcast | |
123 | if [ -n "\$broadcast" ]; then | |
124 | broadcast="broadcast \$broadcast" | |
125 | fi | |
126 | ||
127 | # add a new ip address | |
128 | ip addr add \$ip/\$mask \$broadcast dev \$interface | |
129 | ||
130 | if [ -n "\$router" ]; then | |
131 | ip route add default via \$router dev \$interface | |
132 | fi | |
133 | ||
134 | [ -n "\$domain" ] && echo search \$domain > /etc/resolv.conf | |
135 | for i in \$dns ; do | |
136 | echo nameserver \$i >> /etc/resolv.conf | |
137 | done | |
138 | ;; | |
eb960fea DL |
139 | esac |
140 | exit 0 | |
141 | EOF | |
142 | ||
143 | chmod 744 $rootfs/usr/share/udhcpc/default.script | |
144 | ||
145 | return $res | |
146 | } | |
147 | ||
148 | configure_busybox() | |
149 | { | |
150 | rootfs=$1 | |
151 | ||
3bc15639 | 152 | type busybox >/dev/null |
7674618c | 153 | |
eb960fea | 154 | if [ $? -ne 0 ]; then |
14d9c0f0 SG |
155 | echo "busybox executable is not accessible" |
156 | return 1 | |
eb960fea DL |
157 | fi |
158 | ||
32b37181 DL |
159 | file $(which busybox) | grep -q "statically linked" |
160 | if [ $? -ne 0 ]; then | |
14d9c0f0 SG |
161 | echo "warning : busybox is not statically linked." |
162 | echo "warning : The template script may not correctly" | |
163 | echo "warning : setup the container environment." | |
32b37181 DL |
164 | fi |
165 | ||
eb960fea DL |
166 | # copy busybox in the rootfs |
167 | cp $(which busybox) $rootfs/bin | |
168 | if [ $? -ne 0 ]; then | |
14d9c0f0 SG |
169 | echo "failed to copy busybox in the rootfs" |
170 | return 1 | |
eb960fea DL |
171 | fi |
172 | ||
6902a6c6 DE |
173 | # symlink busybox for the commands it supports |
174 | # it would be nice to just use "chroot $rootfs busybox --install -s /bin" | |
175 | # but that only works right in a chroot with busybox >= 1.19.0 | |
176 | pushd $rootfs/bin > /dev/null || return 1 | |
177 | ./busybox --help | grep 'Currently defined functions:' -A300 | \ | |
178 | grep -v 'Currently defined functions:' | tr , '\n' | \ | |
179 | xargs -n1 ln -s busybox | |
180 | popd > /dev/null | |
eb960fea DL |
181 | |
182 | # relink /sbin/init | |
183 | ln $rootfs/bin/busybox $rootfs/sbin/init | |
184 | ||
185 | # passwd exec must be setuid | |
186 | chmod +s $rootfs/bin/passwd | |
32b37181 | 187 | touch $rootfs/etc/shadow |
6902a6c6 DE |
188 | echo "setting root passwd to root" |
189 | echo "root:root" | chroot $rootfs chpasswd | |
19d618b1 | 190 | |
eb960fea DL |
191 | return 0 |
192 | } | |
193 | ||
194 | copy_configuration() | |
195 | { | |
196 | path=$1 | |
197 | rootfs=$2 | |
198 | name=$3 | |
199 | ||
1881820a | 200 | grep -q "^lxc.rootfs" $path/config 2>/dev/null || echo "lxc.rootfs = $rootfs" >> $path/config |
eb960fea DL |
201 | cat <<EOF >> $path/config |
202 | lxc.utsname = $name | |
203 | lxc.tty = 1 | |
32b37181 | 204 | lxc.pts = 1 |
69d66f1e SG |
205 | |
206 | # When using LXC with apparmor, uncomment the next line to run unconfined: | |
207 | #lxc.aa_profile = unconfined | |
1881820a SH |
208 | EOF |
209 | ||
210 | if [ -d "$rootfs/lib" ]; then | |
211 | cat <<EOF >> $path/config | |
eba7df9e SG |
212 | lxc.mount.entry = /lib $rootfs/lib none ro,bind 0 0 |
213 | lxc.mount.entry = /usr/lib $rootfs/usr/lib none ro,bind 0 0 | |
1881820a SH |
214 | EOF |
215 | fi | |
f02ce27d | 216 | |
6bc424b5 | 217 | libdirs="\ |
5d01f616 SG |
218 | lib \ |
219 | usr/lib \ | |
220 | lib64 \ | |
221 | usr/lib64" | |
6bc424b5 SY |
222 | |
223 | for dir in $libdirs; do | |
5d01f616 | 224 | if [ -d "/$dir" ] && [ -d "$rootfs/$dir" ]; then |
eba7df9e | 225 | echo "lxc.mount.entry = /$dir $dir none ro,bind 0 0" >> $path/config |
6bc424b5 SY |
226 | fi |
227 | done | |
eb960fea DL |
228 | } |
229 | ||
230 | usage() | |
231 | { | |
232 | cat <<EOF | |
233 | $1 -h|--help -p|--path=<path> | |
234 | EOF | |
235 | return 0 | |
236 | } | |
237 | ||
238 | options=$(getopt -o hp:n: -l help,path:,name: -- "$@") | |
239 | if [ $? -ne 0 ]; then | |
14d9c0f0 SG |
240 | usage $(basename $0) |
241 | exit 1 | |
eb960fea DL |
242 | fi |
243 | eval set -- "$options" | |
244 | ||
245 | while true | |
246 | do | |
247 | case "$1" in | |
248 | -h|--help) usage $0 && exit 0;; | |
249 | -p|--path) path=$2; shift 2;; | |
14d9c0f0 | 250 | -n|--name) name=$2; shift 2;; |
eb960fea DL |
251 | --) shift 1; break ;; |
252 | *) break ;; | |
253 | esac | |
254 | done | |
255 | ||
256 | if [ "$(id -u)" != "0" ]; then | |
257 | echo "This script should be run as 'root'" | |
258 | exit 1 | |
259 | fi | |
260 | ||
261 | if [ -z "$path" ]; then | |
262 | echo "'path' parameter is required" | |
263 | exit 1 | |
264 | fi | |
265 | ||
1881820a SH |
266 | # detect rootfs |
267 | config="$path/config" | |
268 | if grep -q '^lxc.rootfs' $config 2>/dev/null ; then | |
269 | rootfs=`grep 'lxc.rootfs =' $config | awk -F= '{ print $2 }'` | |
270 | else | |
271 | rootfs=$path/rootfs | |
272 | fi | |
eb960fea DL |
273 | |
274 | install_busybox $rootfs $name | |
275 | if [ $? -ne 0 ]; then | |
276 | echo "failed to install busybox's rootfs" | |
277 | exit 1 | |
278 | fi | |
279 | ||
280 | configure_busybox $rootfs | |
281 | if [ $? -ne 0 ]; then | |
282 | echo "failed to configure busybox template" | |
283 | exit 1 | |
284 | fi | |
285 | ||
286 | copy_configuration $path $rootfs $name | |
287 | if [ $? -ne 0 ]; then | |
288 | echo "failed to write configuration file" | |
289 | exit 1 | |
290 | fi |