#!/bin/bash # # lxc: linux Container library # Authors: # Daniel Lezcano # This library is free software; you can redistribute it and/or # modify it under the terms of the GNU Lesser General Public # License as published by the Free Software Foundation; either # version 2.1 of the License, or (at your option) any later version. # This library is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU # Lesser General Public License for more details. # You should have received a copy of the GNU Lesser General Public # License along with this library; if not, write to the Free Software # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA SUITE=${SUITE:-lenny} configure_debian() { rootfs=$1 hostname=$2 # configure the inittab cat < $rootfs/etc/inittab id:3:initdefault: si::sysinit:/etc/init.d/rcS l0:0:wait:/etc/init.d/rc 0 l1:1:wait:/etc/init.d/rc 1 l2:2:wait:/etc/init.d/rc 2 l3:3:wait:/etc/init.d/rc 3 l4:4:wait:/etc/init.d/rc 4 l5:5:wait:/etc/init.d/rc 5 l6:6:wait:/etc/init.d/rc 6 # Normally not reached, but fallthrough in case of emergency. z6:6:respawn:/sbin/sulogin 1:2345:respawn:/sbin/getty 38400 console c1:12345:respawn:/sbin/getty 38400 tty1 linux c2:12345:respawn:/sbin/getty 38400 tty2 linux c3:12345:respawn:/sbin/getty 38400 tty3 linux c4:12345:respawn:/sbin/getty 38400 tty4 linux EOF # disable selinux in debian mkdir -p $rootfs/selinux echo 0 > $rootfs/selinux/enforce # configure the network using the dhcp cat < $rootfs/etc/network/interfaces auto lo iface lo inet loopback auto eth0 iface eth0 inet dhcp EOF # set the hostname cat < $rootfs/etc/hostname $hostname EOF # reconfigure some services if [ -z "$LANG" ]; then chroot $rootfs locale-gen en_US.UTF-8 chroot $rootfs update-locale LANG=en_US.UTF-8 else chroot $rootfs locale-gen $LANG chroot $rootfs update-locale LANG=$LANG fi # remove pointless services in a container chroot $rootfs /usr/sbin/update-rc.d -f umountfs remove chroot $rootfs /usr/sbin/update-rc.d -f hwclock.sh remove chroot $rootfs /usr/sbin/update-rc.d -f hwclockfirst.sh remove echo "root:root" | chroot $rootfs chpasswd echo "Root password is 'root', please change !" return 0 } download_debian() { packages=\ ifupdown,\ locales,\ libui-dialog-perl,\ dialog,\ dhcp3-client,\ netbase,\ net-tools,\ iproute,\ openssh-server cache=$1 arch=$2 # check the mini debian was not already downloaded mkdir -p "$cache/partial-$SUITE-$arch" if [ $? -ne 0 ]; then echo "Failed to create '$cache/partial-$SUITE-$arch' directory" return 1 fi # download a mini debian into a cache echo "Downloading debian minimal ..." debootstrap --verbose --variant=minbase --arch=$arch \ --include $packages \ "$SUITE" "$cache/partial-$SUITE-$arch" http://ftp.debian.org/debian if [ $? -ne 0 ]; then echo "Failed to download the rootfs, aborting." return 1 fi mv "$1/partial-$SUITE-$arch" "$1/rootfs-$SUITE-$arch" echo "Download complete." return 0 } copy_debian() { cache=$1 arch=$2 rootfs=$3 # make a local copy of the minidebian echo -n "Copying rootfs to $rootfs..." cp -a "$cache/rootfs-$SUITE-$arch" $rootfs || return 1 return 0 } install_debian() { cache="@LOCALSTATEDIR@/cache/lxc/$SUITE" rootfs=$1 mkdir -p @LOCALSTATEDIR@/lock/subsys/ ( flock -n -x 200 if [ $? -ne 0 ]; then echo "Cache repository is busy." return 1 fi arch=$(dpkg --print-architecture) echo "Checking cache download in $cache/rootfs-$SUITE-$arch ... " if [ ! -e "$cache/rootfs-$SUITE-$arch" ]; then download_debian $cache $arch if [ $? -ne 0 ]; then echo "Failed to download 'debian base'" return 1 fi fi copy_debian $cache $arch $rootfs if [ $? -ne 0 ]; then echo "Failed to copy rootfs" return 1 fi return 0 ) 200>@LOCALSTATEDIR@/lock/subsys/lxc return $? } copy_configuration() { path=$1 rootfs=$2 name=$3 cat <> $path/config lxc.tty = 4 lxc.pts = 1024 lxc.rootfs = $rootfs lxc.cgroup.devices.deny = a # /dev/null and zero lxc.cgroup.devices.allow = c 1:3 rwm lxc.cgroup.devices.allow = c 1:5 rwm # consoles lxc.cgroup.devices.allow = c 5:1 rwm lxc.cgroup.devices.allow = c 5:0 rwm lxc.cgroup.devices.allow = c 4:0 rwm lxc.cgroup.devices.allow = c 4:1 rwm # /dev/{,u}random lxc.cgroup.devices.allow = c 1:9 rwm lxc.cgroup.devices.allow = c 1:8 rwm lxc.cgroup.devices.allow = c 136:* rwm lxc.cgroup.devices.allow = c 5:2 rwm # rtc lxc.cgroup.devices.allow = c 254:0 rwm # mounts point lxc.mount.entry=proc $rootfs/proc proc nodev,noexec,nosuid 0 0 lxc.mount.entry=sysfs $rootfs/sys sysfs defaults 0 0 EOF if [ $? -ne 0 ]; then echo "Failed to add configuration" return 1 fi return 0 } clean() { cache="@LOCALSTATEDIR@/cache/lxc/$SUITE" if [ ! -e $cache ]; then exit 0 fi # lock, so we won't purge while someone is creating a repository ( flock -n -x 200 if [ $? != 0 ]; then echo "Cache repository is busy." exit 1 fi echo -n "Purging the download cache..." rm --preserve-root --one-file-system -rf $cache && echo "Done." || exit 1 exit 0 ) 200>@LOCALSTATEDIR@/lock/subsys/lxc } usage() { cat < --clean EOF return 0 } options=$(getopt -o hp:n:c -l help,path:,name:,clean -- "$@") if [ $? -ne 0 ]; then usage $(basename $0) exit 1 fi eval set -- "$options" while true do case "$1" in -h|--help) usage $0 && exit 0;; -p|--path) path=$2; shift 2;; -n|--name) name=$2; shift 2;; -c|--clean) clean=$2; shift 2;; --) shift 1; break ;; *) break ;; esac done if [ ! -z "$clean" -a -z "$path" ]; then clean || exit 1 exit 0 fi type debootstrap if [ $? -ne 0 ]; then echo "'debootstrap' command is missing" exit 1 fi if [ -z "$path" ]; then echo "'path' parameter is required" exit 1 fi if [ "$(id -u)" != "0" ]; then echo "This script should be run as 'root'" exit 1 fi rootfs=$path/rootfs install_debian $rootfs if [ $? -ne 0 ]; then echo "failed to install debian" exit 1 fi configure_debian $rootfs $name if [ $? -ne 0 ]; then echo "failed to configure debian for a container" exit 1 fi copy_configuration $path $rootfs if [ $? -ne 0 ]; then echo "failed write configuration file" exit 1 fi if [ ! -z $clean ]; then clean || exit 1 exit 0 fi