1 | #!/bin/bash |
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2 | |
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3 | # |
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4 | # lxc: linux Container library |
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5 | |
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6 | # Authors: |
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7 | # Daniel Lezcano <daniel.lezcano@free.fr> |
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8 | |
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9 | # This library is free software; you can redistribute it and/or |
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10 | # modify it under the terms of the GNU Lesser General Public |
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11 | # License as published by the Free Software Foundation; either |
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12 | # version 2.1 of the License, or (at your option) any later version. |
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13 | |
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14 | # This library is distributed in the hope that it will be useful, |
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15 | # but WITHOUT ANY WARRANTY; without even the implied warranty of |
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16 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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17 | # Lesser General Public License for more details. |
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18 | |
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19 | # You should have received a copy of the GNU Lesser General Public |
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20 | # License along with this library; if not, write to the Free Software |
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21 | # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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22 | |
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23 | SUITE=${SUITE:-squeeze} |
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24 | MIRROR=${MIRROR:-http://cdn.debian.net/debian} |
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25 | |
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26 | configure_debian() |
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27 | { |
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28 | rootfs=$1 |
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29 | hostname=$2 |
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30 | |
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31 | # squeeze only has /dev/tty and /dev/tty0 by default, |
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32 | # therefore creating missing device nodes for tty1-4. |
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33 | for tty in $(seq 1 4); do |
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34 | if [ ! -e $rootfs/dev/tty$tty ]; then |
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35 | mknod $rootfs/dev/tty$tty c 4 $tty |
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36 | fi |
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37 | done |
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38 | |
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39 | # configure the inittab |
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40 | cat <<EOF > $rootfs/etc/inittab |
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41 | id:3:initdefault: |
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42 | si::sysinit:/etc/init.d/rcS |
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43 | l0:0:wait:/etc/init.d/rc 0 |
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44 | l1:1:wait:/etc/init.d/rc 1 |
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45 | l2:2:wait:/etc/init.d/rc 2 |
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46 | l3:3:wait:/etc/init.d/rc 3 |
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47 | l4:4:wait:/etc/init.d/rc 4 |
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48 | l5:5:wait:/etc/init.d/rc 5 |
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49 | l6:6:wait:/etc/init.d/rc 6 |
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50 | # Normally not reached, but fallthrough in case of emergency. |
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51 | z6:6:respawn:/sbin/sulogin |
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52 | 1:2345:respawn:/sbin/getty 38400 console |
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53 | c1:12345:respawn:/sbin/getty 38400 tty1 linux |
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54 | c2:12345:respawn:/sbin/getty 38400 tty2 linux |
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55 | c3:12345:respawn:/sbin/getty 38400 tty3 linux |
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56 | c4:12345:respawn:/sbin/getty 38400 tty4 linux |
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57 | p6::ctrlaltdel:/sbin/init 6 |
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58 | p0::powerfail:/sbin/init 0 |
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59 | EOF |
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60 | |
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61 | # disable selinux in debian |
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62 | mkdir -p $rootfs/selinux |
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63 | echo 0 > $rootfs/selinux/enforce |
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64 | |
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65 | # configure the network using the dhcp |
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66 | cat <<EOF > $rootfs/etc/network/interfaces |
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67 | auto lo |
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68 | iface lo inet loopback |
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69 | |
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70 | auto eth0 |
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71 | iface eth0 inet dhcp |
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72 | EOF |
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73 | |
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74 | # set the hostname |
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75 | cat <<EOF > $rootfs/etc/hostname |
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76 | $hostname |
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77 | EOF |
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78 | |
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79 | # reconfigure some services |
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80 | if [ -z "$LANG" ]; then |
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81 | chroot $rootfs locale-gen en_US.UTF-8 UTF-8 |
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82 | chroot $rootfs update-locale LANG=en_US.UTF-8 |
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83 | else |
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84 | chroot $rootfs locale-gen $LANG $(echo $LANG | cut -d. -f2) |
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85 | chroot $rootfs update-locale LANG=$LANG |
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86 | fi |
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87 | |
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88 | # remove pointless services in a container |
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89 | chroot $rootfs /usr/sbin/update-rc.d -f checkroot.sh remove |
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90 | chroot $rootfs /usr/sbin/update-rc.d -f umountfs remove |
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91 | chroot $rootfs /usr/sbin/update-rc.d -f hwclock.sh remove |
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92 | chroot $rootfs /usr/sbin/update-rc.d -f hwclockfirst.sh remove |
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93 | |
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94 | echo "root:root" | chroot $rootfs chpasswd |
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95 | echo "Root password is 'root', please change !" |
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96 | |
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97 | return 0 |
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98 | } |
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99 | |
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100 | cleanup() |
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101 | { |
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102 | rm -rf $cache/partial-$SUITE-$arch |
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103 | rm -rf $cache/rootfs-$SUITE-$arch |
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104 | } |
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105 | |
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106 | download_debian() |
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107 | { |
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108 | packages=\ |
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109 | ifupdown,\ |
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110 | locales,\ |
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111 | libui-dialog-perl,\ |
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112 | dialog,\ |
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113 | isc-dhcp-client,\ |
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114 | netbase,\ |
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115 | net-tools,\ |
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116 | iproute,\ |
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117 | openssh-server |
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118 | |
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119 | cache=$1 |
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120 | arch=$2 |
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121 | |
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122 | trap cleanup EXIT SIGHUP SIGINT SIGTERM |
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123 | # check the mini debian was not already downloaded |
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124 | mkdir -p "$cache/partial-$SUITE-$arch" |
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125 | if [ $? -ne 0 ]; then |
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126 | echo "Failed to create '$cache/partial-$SUITE-$arch' directory" |
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127 | return 1 |
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128 | fi |
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129 | |
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130 | # download a mini debian into a cache |
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131 | echo "Downloading debian minimal ..." |
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132 | debootstrap --verbose --variant=minbase --arch=$arch \ |
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133 | --include=$packages \ |
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134 | "$SUITE" "$cache/partial-$SUITE-$arch" $MIRROR |
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135 | if [ $? -ne 0 ]; then |
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136 | echo "Failed to download the rootfs, aborting." |
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137 | return 1 |
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138 | fi |
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139 | |
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140 | mv "$1/partial-$SUITE-$arch" "$1/rootfs-$SUITE-$arch" |
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141 | echo "Download complete." |
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142 | trap EXIT |
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143 | trap SIGINT |
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144 | trap SIGTERM |
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145 | trap SIGHUP |
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146 | |
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147 | return 0 |
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148 | } |
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149 | |
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150 | copy_debian() |
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151 | { |
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152 | cache=$1 |
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153 | arch=$2 |
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154 | rootfs=$3 |
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155 | |
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156 | # make a local copy of the minidebian |
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157 | echo -n "Copying rootfs to $rootfs..." |
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158 | mkdir -p $rootfs |
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159 | rsync -a "$cache/rootfs-$SUITE-$arch"/ $rootfs/ || return 1 |
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160 | return 0 |
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161 | } |
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162 | |
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163 | install_debian() |
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164 | { |
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165 | cache="/var/cache/lxc/debian" |
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166 | rootfs=$1 |
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167 | mkdir -p /var/lock/subsys/ |
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168 | ( |
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169 | flock -x 200 |
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170 | if [ $? -ne 0 ]; then |
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171 | echo "Cache repository is busy." |
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172 | return 1 |
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173 | fi |
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174 | |
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175 | arch=$(dpkg --print-architecture) |
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176 | |
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177 | echo "Checking cache download in $cache/rootfs-$SUITE-$arch ... " |
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178 | if [ ! -e "$cache/rootfs-$SUITE-$arch" ]; then |
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179 | download_debian $cache $arch |
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180 | if [ $? -ne 0 ]; then |
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181 | echo "Failed to download 'debian base'" |
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182 | return 1 |
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183 | fi |
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184 | fi |
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185 | |
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186 | copy_debian $cache $arch $rootfs |
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187 | if [ $? -ne 0 ]; then |
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188 | echo "Failed to copy rootfs" |
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189 | return 1 |
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190 | fi |
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191 | |
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192 | return 0 |
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193 | |
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194 | ) 200>/var/lock/subsys/lxc |
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195 | |
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196 | return $? |
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197 | } |
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198 | |
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199 | copy_configuration() |
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200 | { |
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201 | path=$1 |
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202 | rootfs=$2 |
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203 | hostname=$3 |
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204 | |
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205 | grep -q "^lxc.rootfs" $path/config 2>/dev/null || echo "lxc.rootfs = $rootfs" >> $path/config |
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206 | cat <<EOF >> $path/config |
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207 | lxc.tty = 4 |
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208 | lxc.pts = 1024 |
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209 | lxc.utsname = $hostname |
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210 | # uncomment the next line to run the container unconfined: |
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211 | #lxc.aa_profile = unconfined |
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212 | lxc.cgroup.devices.deny = a |
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213 | # /dev/null and zero |
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214 | lxc.cgroup.devices.allow = c 1:3 rwm |
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215 | lxc.cgroup.devices.allow = c 1:5 rwm |
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216 | # consoles |
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217 | lxc.cgroup.devices.allow = c 5:1 rwm |
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218 | lxc.cgroup.devices.allow = c 5:0 rwm |
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219 | lxc.cgroup.devices.allow = c 4:0 rwm |
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220 | lxc.cgroup.devices.allow = c 4:1 rwm |
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221 | # /dev/{,u}random |
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222 | lxc.cgroup.devices.allow = c 1:9 rwm |
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223 | lxc.cgroup.devices.allow = c 1:8 rwm |
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224 | lxc.cgroup.devices.allow = c 136:* rwm |
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225 | lxc.cgroup.devices.allow = c 5:2 rwm |
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226 | # rtc |
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227 | lxc.cgroup.devices.allow = c 254:0 rwm |
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228 | |
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229 | # mounts point |
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230 | lxc.mount.entry=proc proc proc nodev,noexec,nosuid 0 0 |
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231 | lxc.mount.entry=sysfs sys sysfs defaults 0 0 |
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232 | EOF |
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233 | |
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234 | if [ $? -ne 0 ]; then |
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235 | echo "Failed to add configuration" |
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236 | return 1 |
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237 | fi |
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238 | |
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239 | return 0 |
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240 | } |
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241 | |
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242 | clean() |
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243 | { |
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244 | cache="/var/cache/lxc/debian" |
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245 | |
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246 | if [ ! -e $cache ]; then |
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247 | exit 0 |
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248 | fi |
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249 | |
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250 | # lock, so we won't purge while someone is creating a repository |
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251 | ( |
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252 | flock -n -x 200 |
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253 | if [ $? != 0 ]; then |
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254 | echo "Cache repository is busy." |
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255 | exit 1 |
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256 | fi |
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257 | |
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258 | echo -n "Purging the download cache..." |
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259 | rm --preserve-root --one-file-system -rf $cache && echo "Done." || exit 1 |
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260 | exit 0 |
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261 | |
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262 | ) 200>/var/lock/subsys/lxc |
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263 | } |
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264 | |
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265 | usage() |
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266 | { |
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267 | cat <<EOF |
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268 | $1 -h|--help -p|--path=<path> --clean |
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269 | EOF |
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270 | return 0 |
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271 | } |
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272 | |
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273 | options=$(getopt -o hp:n:c -l help,path:,name:,clean -- "$@") |
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274 | if [ $? -ne 0 ]; then |
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275 | usage $(basename $0) |
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276 | exit 1 |
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277 | fi |
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278 | eval set -- "$options" |
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279 | |
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280 | while true |
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281 | do |
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282 | case "$1" in |
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283 | -h|--help) usage $0 && exit 0;; |
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284 | -p|--path) path=$2; shift 2;; |
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285 | -n|--name) name=$2; shift 2;; |
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286 | -c|--clean) clean=$2; shift 2;; |
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287 | --) shift 1; break ;; |
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288 | *) break ;; |
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289 | esac |
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290 | done |
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291 | |
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292 | if [ ! -z "$clean" -a -z "$path" ]; then |
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293 | clean || exit 1 |
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294 | exit 0 |
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295 | fi |
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296 | |
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297 | type debootstrap |
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298 | if [ $? -ne 0 ]; then |
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299 | echo "'debootstrap' command is missing" |
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300 | exit 1 |
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301 | fi |
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302 | |
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303 | if [ -z "$path" ]; then |
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304 | echo "'path' parameter is required" |
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305 | exit 1 |
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306 | fi |
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307 | |
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308 | if [ "$(id -u)" != "0" ]; then |
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309 | echo "This script should be run as 'root'" |
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310 | exit 1 |
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311 | fi |
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312 | |
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313 | # detect rootfs |
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314 | config="$path/config" |
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315 | if grep -q '^lxc.rootfs' $config 2>/dev/null ; then |
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316 | rootfs=`grep 'lxc.rootfs =' $config | awk -F= '{ print $2 }'` |
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317 | else |
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318 | rootfs=$path/rootfs |
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319 | fi |
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320 | |
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321 | |
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322 | install_debian $rootfs |
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323 | if [ $? -ne 0 ]; then |
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324 | echo "failed to install debian" |
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325 | exit 1 |
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326 | fi |
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327 | |
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328 | configure_debian $rootfs $name |
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329 | if [ $? -ne 0 ]; then |
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330 | echo "failed to configure debian for a container" |
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331 | exit 1 |
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332 | fi |
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333 | |
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334 | copy_configuration $path $rootfs $name |
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335 | if [ $? -ne 0 ]; then |
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336 | echo "failed write configuration file" |
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337 | exit 1 |
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338 | fi |
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339 | |
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340 | if [ ! -z $clean ]; then |
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341 | clean || exit 1 |
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342 | exit 0 |
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343 | fi |
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