templates/lxc-busybox.in

   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="\
  29 $rootfs/selinux \
  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 \
  42 $rootfs/dev/pts \
  43 $rootfs/dev/shm \
  44 $rootfs/lib \
  45 $rootfs/usr/lib \
  46 $rootfs/lib64 \
  47 $rootfs/usr/lib64"
  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
  78     # mount everything
  79     cat <<EOF >> $rootfs/etc/init.d/rcS
  80 #!/bin/sh
  81 /bin/syslogd
  82 /bin/mount -a
  83 /bin/udhcpc
  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
 103 tty1::respawn:/bin/getty -L tty1 115200 vt100
 104 console::askfirst:/bin/sh
 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
 111
 112 case "\$1" in
 113         deconfig)
 114                 ip addr flush dev \$interface
 115                 ;;
 116
 117         renew|bound)
 118
 119                 # flush all the routes
 120                 if [ -n "\$router" ]; then
 121                         ip route del default 2> /dev/null
 122                 fi
 123
 124                 # check broadcast
 125                 if [ -n "\$broadcast" ]; then
 126                         broadcast="broadcast \$broadcast"
 127                 fi
 128
 129                 # add a new ip address
 130                 ip addr add \$ip/\$mask \$broadcast dev \$interface
 131
 132                 if [ -n "\$router" ]; then
 133                         ip route add default via \$router dev \$interface
 134                 fi
 135
 136                 [ -n "\$domain" ] && echo search \$domain > /etc/resolv.conf
 137                 for i in \$dns ; do
 138                         echo nameserver \$i >> /etc/resolv.conf
 139                 done
 140                 ;;
 141 esac
 142 exit 0
 143 EOF
 144
 145     chmod 744 $rootfs/usr/share/udhcpc/default.script
 146
 147     return $res
 148 }
 149
 150 configure_busybox()
 151 {
 152     rootfs=$1
 153
 154     functions="\
 155         [ [[ addgroup adduser adjtimex ar arp arping ash awk basename \
 156         brctl bunzip2 bzcat bzip2 cal cat catv chattr chgrp chmod \
 157         chown chpasswd chpst chroot chrt chvt cksum clear cmp comm \
 158         cp cpio crond crontab cryptpw cut date dc dd deallocvt \
 159         delgroup deluser df dhcprelay diff dirname dmesg dnsd dos2unix \
 160         du dumpkmap dumpleases echo ed egrep eject env envdir envuidgid \
 161         ether-wake expand expr fakeidentd false fbset fdformat fdisk \
 162         fetchmail fgrep find findfs fold free freeramdisk fsck \
 163         fsck.minix ftpget ftpput fuser getopt getty grep gunzip gzip \
 164         halt hdparm head hexdump hostid hostname httpd hwclock id \
 165         ifconfig ifdown ifenslave ifup inetd init insmod install ip \
 166         ipaddr ipcalc ipcrm ipcs iplink iproute iprule iptunnel \
 167         kbd_mode kill killall killall5 klogd last length less linux32 \
 168         linux64 linuxrc ln loadfont loadkmap logger login logname \
 169         logread losetup lpd lpq lpr ls lsattr lsmod lzmacat makedevs \
 170         md5sum mdev mesg microcom mkdir mkfifo mkfs.minix mknod mkswap \
 171         mktemp modprobe more mount mountpoint msh mt mv nameif nc \
 172         netstat nice nmeter nohup nslookup od openvt passwd patch \
 173         pgrep pidof ping ping6 pipe_progress pivot_root pkill poweroff \
 174         printenv printf ps pscan pwd raidautorun rdate readahead \
 175         readlink readprofile realpath reboot renice reset resize rm \
 176         rmdir rmmod route rpm rpm2cpio run-parts runlevel runsv \
 177         runsvdir rx script sed sendmail seq setarch setconsole \
 178         setkeycodes setlogcons setsid setuidgid sh sha1sum slattach \
 179         sleep softlimit sort split start-stop-daemon stat strings \
 180         stty su sulogin sum sv svlogd swapoff swapon switch_root \
 181         sync sysctl syslogd tac tail tar taskset tcpsvd tee telnet \
 182         telnetd test tftp tftpd time top touch tr traceroute \
 183         true tty ttysize udhcpc udhcpd udpsvd umount uname uncompress \
 184         unexpand uniq unix2dos unlzma unzip uptime usleep uudecode \
 185         uuencode vconfig vi vlock watch watchdog wc wget which \
 186         who whoami xargs yes zcat zcip"
 187
 188     type busybox >/dev/null
 189
 190     if [ $? -ne 0 ]; then
 191         echo "busybox executable is not accessible"
 192         return 1
 193     fi
 194
 195     file $(which busybox) | grep -q "statically linked"
 196     if [ $? -ne 0 ]; then
 197         echo "warning : busybox is not statically linked."
 198         echo "warning : The template script may not correctly"
 199         echo "warning : setup the container environment."
 200     fi
 201
 202     # copy busybox in the rootfs
 203     cp $(which busybox) $rootfs/bin
 204     if [ $? -ne 0 ]; then
 205         echo "failed to copy busybox in the rootfs"
 206         return 1
 207     fi
 208
 209     # do hardlink to busybox for the different commands
 210     for i in $functions; do ln $rootfs/bin/busybox $rootfs/bin/$i; done
 211
 212     # relink /sbin/init
 213     ln $rootfs/bin/busybox $rootfs/sbin/init
 214
 215     # passwd exec must be setuid
 216     chmod +s $rootfs/bin/passwd
 217     touch $rootfs/etc/shadow
 218     chroot $rootfs /bin/passwd -d root
 219
 220     echo "No password for 'root', please change !"
 221
 222     return 0
 223 }
 224
 225 copy_configuration()
 226 {
 227     path=$1
 228     rootfs=$2
 229     name=$3
 230
 231 cat <<EOF >> $path/config
 232 lxc.utsname = $name
 233 lxc.tty = 1
 234 lxc.pts = 1
 235 lxc.rootfs = $rootfs
 236 EOF
 237
 238 if [ -d "$rootfs/lib" ]; then
 239 cat <<EOF >> $path/config
 240 lxc.mount.entry=/lib $rootfs/lib none ro,bind 0 0
 241 lxc.mount.entry=/usr/lib $rootfs/usr/lib none ro,bind 0 0
 242 EOF
 243 fi
 244
 245 if [ -d "/lib64" ] && [ -d "$rootfs/lib64" ]; then
 246 cat <<EOF >> $path/config
 247 lxc.mount.entry=/lib64 $rootfs/lib64 none ro,bind 0 0
 248 EOF
 249 fi
 250
 251 if [ -d "/usr/lib64" ] && [ -d "$rootfs/usr/lib64" ]; then
 252 cat <<EOF >> $path/config
 253 lxc.mount.entry=/usr/lib64 $rootfs/usr/lib64 none ro,bind 0 0
 254 EOF
 255 fi
 256 }
 257
 258 usage()
 259 {
 260     cat <<EOF
 261 $1 -h|--help -p|--path=<path>
 262 EOF
 263     return 0
 264 }
 265
 266 options=$(getopt -o hp:n: -l help,path:,name: -- "$@")
 267 if [ $? -ne 0 ]; then
 268         usage $(basename $0)
 269         exit 1
 270 fi
 271 eval set -- "$options"
 272
 273 while true
 274 do
 275     case "$1" in
 276         -h|--help)      usage $0 && exit 0;;
 277         -p|--path)      path=$2; shift 2;;
 278         -n|--name)      name=$2; shift 2;;
 279         --)             shift 1; break ;;
 280         *)              break ;;
 281     esac
 282 done
 283
 284 if [ "$(id -u)" != "0" ]; then
 285     echo "This script should be run as 'root'"
 286     exit 1
 287 fi
 288
 289 if [ -z "$path" ]; then
 290     echo "'path' parameter is required"
 291     exit 1
 292 fi
 293
 294 rootfs=$path/rootfs
 295
 296 install_busybox $rootfs $name
 297 if [ $? -ne 0 ]; then
 298     echo "failed to install busybox's rootfs"
 299     exit 1
 300 fi
 301
 302 configure_busybox $rootfs
 303 if [ $? -ne 0 ]; then
 304     echo "failed to configure busybox template"
 305     exit 1
 306 fi
 307
 308 copy_configuration $path $rootfs $name
 309 if [ $? -ne 0 ]; then
 310     echo "failed to write configuration file"
 311     exit 1
 312 fi