4 # lxc: linux Container library
7 # Daniel Lezcano <daniel.lezcano@free.fr>
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.
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.
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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 [ -e /proc
/self
/uid_map
] ||
{ echo no
; return; }
25 [ "$(wc -l /proc/self/uid_map | awk '{ print $1 }')" -eq 1 ] ||
{ echo yes; return; }
26 line
=$
(awk '{ print $1 " " $2 " " $3 }' /proc
/self
/uid_map
)
27 [ "$line" = "0 0 4294967295" ] && { echo no
; return; }
32 [ $
(am_in_userns
) = "yes" ] && in_userns
=1
55 $rootfs/usr/share/udhcpc \
63 mkdir
-p $tree ||
return 1
64 chmod 755 $tree ||
return 1
66 pushd $rootfs/dev
> /dev
/null ||
return 1
68 # minimal devices needed for busybox
69 if [ $in_userns -eq 1 ]; then
70 for dev
in tty console tty0 tty1 tty5 ram0 null urandom
; do
71 touch $rootfs/dev
/$dev
72 echo "/dev/$dev dev/$dev none bind 0 0" >> $path/fstab
75 mknod
-m 666 tty c
5 0 || res
=1
76 mknod
-m 666 console c
5 1 || res
=1
77 mknod
-m 666 tty0 c
4 0 || res
=1
78 mknod
-m 666 tty1 c
4 0 || res
=1
79 mknod
-m 666 tty5 c
4 0 || res
=1
80 mknod
-m 600 ram0 b
1 0 || res
=1
81 mknod
-m 666 null c
1 3 || res
=1
82 mknod
-m 666 zero c
1 5 || res
=1
83 mknod
-m 666 urandom c
1 9 || res
=1
89 cat <<EOF >> $rootfs/etc/passwd
90 root:x:0:0:root:/root:/bin/sh
93 cat <<EOF >> $rootfs/etc/group
98 cat <<EOF >> $rootfs/etc/init.d/rcS
106 chmod 744 $rootfs/etc
/init.d
/rcS ||
return 1
109 cat <<EOF >> $rootfs/etc/fstab
110 shm /dev/shm tmpfs defaults 0 0
113 # writable and readable for other
114 chmod 644 $rootfs/etc
/fstab ||
return 1
116 # launch rcS first then make a console available
117 # and propose a shell on the tty, the last one is
119 cat <<EOF >> $rootfs/etc/inittab
120 ::sysinit:/etc/init.d/rcS
121 tty1::respawn:/bin/getty -L tty1 115200 vt100
122 console::askfirst:/bin/sh
124 # writable and readable for other
125 chmod 644 $rootfs/etc
/inittab ||
return 1
127 cat <<EOF >> $rootfs/usr/share/udhcpc/default.script
131 ip addr flush dev \$interface
135 # flush all the routes
136 if [ -n "\$router" ]; then
137 ip route del default 2> /dev/null
141 if [ -n "\$broadcast" ]; then
142 broadcast="broadcast \$broadcast"
145 # add a new ip address
146 ip addr add \$ip/\$mask \$broadcast dev \$interface
148 if [ -n "\$router" ]; then
149 ip route add default via \$router dev \$interface
152 [ -n "\$domain" ] && echo search \$domain > /etc/resolv.conf
154 echo nameserver \$i >> /etc/resolv.conf
161 chmod 744 $rootfs/usr
/share
/udhcpc
/default.
script
170 which busybox
>/dev
/null
2>&1
172 if [ $?
-ne 0 ]; then
173 echo "busybox executable is not accessible"
177 file $
(which busybox
) |
grep -q "statically linked"
178 if [ $?
-ne 0 ]; then
179 echo "warning : busybox is not statically linked."
180 echo "warning : The template script may not correctly"
181 echo "warning : setup the container environment."
184 # copy busybox in the rootfs
185 cp $
(which busybox
) $rootfs/bin
186 if [ $?
-ne 0 ]; then
187 echo "failed to copy busybox in the rootfs"
191 # symlink busybox for the commands it supports
192 # it would be nice to just use "chroot $rootfs busybox --install -s /bin"
193 # but that only works right in a chroot with busybox >= 1.19.0
194 pushd $rootfs/bin
> /dev
/null ||
return 1
195 .
/busybox
--help |
grep 'Currently defined functions:' -A300 | \
196 grep -v 'Currently defined functions:' |
tr , '\n' | \
197 xargs -n1 ln -s busybox
201 ln $rootfs/bin
/busybox
$rootfs/sbin
/init
203 # passwd exec must be setuid
204 chmod +s
$rootfs/bin
/passwd
205 touch $rootfs/etc
/shadow
207 # setting passwd for root
208 CHPASSWD_FILE
=$rootfs/root
/chpasswd.sh
210 cat <<EOF >$CHPASSWD_FILE
211 echo "setting root password to \"root\""
213 mount -n --bind /lib $rootfs/lib
214 if [ \$? -ne 0 ]; then
215 echo "Failed bind-mounting /lib at $rootfs/lib"
219 chroot $rootfs chpasswd <<EOFF 2>/dev/null
224 if [ \$? -ne 0 ]; then
225 echo "Failed to change root password"
233 lxc-unshare
-s MOUNT
-- /bin
/sh
< $CHPASSWD_FILE
236 # add ssh functionality if dropbear package available on host
237 which dropbear
>/dev
/null
2>&1
238 if [ $?
-eq 0 ]; then
239 # copy dropbear binary
240 cp $
(which dropbear
) $rootfs/usr
/sbin
241 if [ $?
-ne 0 ]; then
242 echo "Failed to copy dropbear in the rootfs"
246 # make symlinks to various ssh utilities
248 $rootfs/usr/bin/dbclient \
249 $rootfs/usr/bin/scp \
250 $rootfs/usr/bin/ssh \
251 $rootfs/usr/sbin/dropbearkey \
252 $rootfs/usr/sbin/dropbearconvert \
254 echo $utils |
xargs -n1 ln -s /usr
/sbin
/dropbear
256 # add necessary config files
257 mkdir
$rootfs/etc
/dropbear
258 dropbearkey
-t rsa
-f $rootfs/etc
/dropbear
/dropbear_rsa_host_key
&> /dev
/null
259 dropbearkey
-t dss
-f $rootfs/etc
/dropbear
/dropbear_dss_host_key
&> /dev
/null
261 echo "'dropbear' ssh utility installed"
273 grep -q "^lxc.rootfs" $path/config
2>/dev
/null ||
echo "lxc.rootfs = $rootfs" >> $path/config
274 cat <<EOF >> $path/config
275 lxc.haltsignal = SIGUSR1
279 lxc.cap.drop = sys_module mac_admin mac_override sys_time
281 # When using LXC with apparmor, uncomment the next line to run unconfined:
282 #lxc.aa_profile = unconfined
291 for dir
in $libdirs; do
292 if [ -d "/$dir" ] && [ -d "$rootfs/$dir" ]; then
293 echo "lxc.mount.entry = /$dir $dir none ro,bind 0 0" >> $path/config
296 echo "lxc.mount.entry = /sys/kernel/security sys/kernel/security none ro,bind,optional 0 0" >>$path/config
297 echo "lxc.mount.auto = proc:mixed sys" >>$path/config
303 $1 -h|--help -p|--path=<path>
308 options
=$
(getopt
-o hp
:n
: -l help,rootfs
:,path
:,name
: -- "$@")
309 if [ $?
-ne 0 ]; then
313 eval set -- "$options"
318 -h|
--help) usage
$0 && exit 0;;
319 -p|
--path) path
=$2; shift 2;;
320 --rootfs) rootfs
=$2; shift 2;;
321 -n|
--name) name
=$2; shift 2;;
322 --) shift 1; break ;;
327 if [ "$(id -u)" != "0" ]; then
328 echo "This script should be run as 'root'"
332 if [ -z "$path" ]; then
333 echo "'path' parameter is required"
338 config
="$path/config"
339 if [ -z "$rootfs" ]; then
340 if grep -q '^lxc.rootfs' $config 2>/dev
/null
; then
341 rootfs
=$
(awk -F= '/^lxc.rootfs =/{ print $2 }' $config)
347 install_busybox
$rootfs $name
348 if [ $?
-ne 0 ]; then
349 echo "failed to install busybox's rootfs"
353 configure_busybox
$rootfs
354 if [ $?
-ne 0 ]; then
355 echo "failed to configure busybox template"
359 copy_configuration
$path $rootfs $name
360 if [ $?
-ne 0 ]; then
361 echo "failed to write configuration file"