Extract a general purpose experimental lxc template
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Fabio Rehm
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boxes/common/lxc-template
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boxes/common/lxc-template
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#!/bin/bash
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# This is a modified version of /usr/share/lxc/templates/lxc-ubuntu
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# that comes with Ubuntu 13.04 changed to suit vagrant-lxc needs
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#
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# template script for generating ubuntu container for LXC
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#
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# This script consolidates and extends the existing lxc ubuntu scripts
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#
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# Copyright © 2011 Serge Hallyn <serge.hallyn@canonical.com>
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# Copyright © 2010 Wilhelm Meier
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# Author: Wilhelm Meier <wilhelm.meier@fh-kl.de>
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License version 2, as
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# published by the Free Software Foundation.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License along
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# with this program; if not, write to the Free Software Foundation, Inc.,
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# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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#
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set -e
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if [ -r /etc/default/lxc ]; then
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. /etc/default/lxc
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fi
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extract_rootfs()
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{
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tarball=$1
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arch=$2
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rootfs=$3
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echo "Extracting $tarball ..."
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mkdir -p $(dirname $rootfs)
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(cd `dirname $rootfs` && tar xfz $tarball)
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return 0
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}
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install_ubuntu()
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{
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rootfs=$1
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release=$2
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tarball=$3
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mkdir -p /var/lock/subsys/
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(
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flock -x 200
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if [ $? -ne 0 ]; then
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echo "Cache repository is busy."
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return 1
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fi
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extract_rootfs $tarball $arch $rootfs
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if [ $? -ne 0 ]; then
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echo "Failed to copy rootfs"
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return 1
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fi
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return 0
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) 200>/var/lock/subsys/lxc
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return $?
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}
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copy_configuration()
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{
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path=$1
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rootfs=$2
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name=$3
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arch=$4
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if [ $arch = "i386" ]; then
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arch="i686"
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fi
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# if there is exactly one veth network entry, make sure it has an
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# associated hwaddr.
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nics=`grep -e '^lxc\.network\.type[ \t]*=[ \t]*veth' $path/config | wc -l`
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if [ $nics -eq 1 ]; then
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grep -q "^lxc.network.hwaddr" $path/config || sed -i -e "/^lxc\.network\.type[ \t]*=[ \t]*veth/a lxc.network.hwaddr = 00:16:3e:$(openssl rand -hex 3| sed 's/\(..\)/\1:/g; s/.$//')" $path/config
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fi
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if [ $? -ne 0 ]; then
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echo "Failed to add configuration"
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return 1
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fi
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return 0
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}
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post_process()
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{
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rootfs=$1
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# rmdir /dev/shm for containers that have /run/shm
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# I'm afraid of doing rm -rf $rootfs/dev/shm, in case it did
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# get bind mounted to the host's /run/shm. So try to rmdir
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# it, and in case that fails move it out of the way.
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if [ ! -L $rootfs/dev/shm ] && [ -d $rootfs/run/shm ] && [ -e $rootfs/dev/shm ]; then
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mv $rootfs/dev/shm $rootfs/dev/shm.bak
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ln -s /run/shm $rootfs/dev/shm
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fi
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}
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usage()
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{
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cat <<EOF
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$1 -h|--help [-a|--arch] [--trim] [-d|--debug]
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[-F | --flush-cache] [-r|--release <release>] [ -S | --auth-key <keyfile>]
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release: the ubuntu release (e.g. precise): defaults to host release on ubuntu, otherwise uses latest LTS
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trim: make a minimal (faster, but not upgrade-safe) container
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arch: the container architecture (e.g. amd64): defaults to host arch
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auth-key: SSH Public key file to inject into container
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EOF
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return 0
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}
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options=$(getopt -o a:b:hp:r:xn:FS:d:C -l arch:,help,path:,release:,trim,name:,flush-cache,auth-key:,debug:,tarball: -- "$@")
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if [ $? -ne 0 ]; then
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usage $(basename $0)
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exit 1
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fi
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eval set -- "$options"
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release=precise # Default to the last Ubuntu LTS release for non-Ubuntu systems
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if [ -f /etc/lsb-release ]; then
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. /etc/lsb-release
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if [ "$DISTRIB_ID" = "Ubuntu" ]; then
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release=$DISTRIB_CODENAME
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fi
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fi
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arch=$(uname -m)
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# Code taken from debootstrap
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if [ -x /usr/bin/dpkg ] && /usr/bin/dpkg --print-architecture >/dev/null 2>&1; then
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arch=`/usr/bin/dpkg --print-architecture`
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elif type udpkg >/dev/null 2>&1 && udpkg --print-architecture >/dev/null 2>&1; then
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arch=`/usr/bin/udpkg --print-architecture`
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else
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arch=$(uname -m)
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if [ "$arch" = "i686" ]; then
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arch="i386"
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elif [ "$arch" = "x86_64" ]; then
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arch="amd64"
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elif [ "$arch" = "armv7l" ]; then
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arch="armel"
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fi
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fi
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debug=0
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trim_container=0
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hostarch=$arch
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while true
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do
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case "$1" in
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-h|--help) usage $0 && exit 0;;
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-p|--path) path=$2; shift 2;;
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-n|--name) name=$2; shift 2;;
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-T|--tarball) tarball=$2; shift 2;;
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-r|--release) release=$2; shift 2;;
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-a|--arch) arch=$2; shift 2;;
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-x|--trim) trim_container=1; shift 1;;
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-S|--auth-key) auth_key=$2; shift 2;;
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-d|--debug) debug=1; shift 1;;
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--) shift 1; break ;;
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*) break ;;
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esac
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done
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if [ $debug -eq 1 ]; then
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set -x
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fi
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if [ "$arch" == "i686" ]; then
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arch=i386
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fi
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if [ $hostarch = "i386" -a $arch = "amd64" ]; then
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echo "can't create amd64 container on i386"
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exit 1
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fi
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if [ -z "$path" ]; then
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echo "'path' parameter is required"
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exit 1
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fi
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if [ "$(id -u)" != "0" ]; then
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echo "This script should be run as 'root'"
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exit 1
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fi
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# detect rootfs
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config="$path/config"
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if grep -q '^lxc.rootfs' $config 2>/dev/null ; then
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rootfs=`grep 'lxc.rootfs =' $config | awk -F= '{ print $2 }'`
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else
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rootfs=$path/rootfs
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fi
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install_ubuntu $rootfs $release $tarball
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if [ $? -ne 0 ]; then
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echo "failed to install ubuntu $release"
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exit 1
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fi
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copy_configuration $path $rootfs $name $arch
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if [ $? -ne 0 ]; then
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echo "failed write configuration file"
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exit 1
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fi
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post_process $rootfs $release $trim_container
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echo ""
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echo "##"
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echo "# The default user is 'vagrant' with password 'vagrant'!"
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echo "# Use the 'sudo' command to run tasks as root in the container."
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echo "##"
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echo ""
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