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#!/bin/bash
# template script for generating ubuntu container for LXC based on daily cloud
# images
#
# Copyright © 2012 Serge Hallyn <serge.hallyn@canonical.com>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2, as
# published by the Free Software Foundation.
# This program 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 General Public License for more details.
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#
set -e
if [ -r /etc/default/lxc ]; then
. /etc/default/lxc
fi
copy_configuration()
{
path=$1
rootfs=$2
name=$3
arch=$4
if [ $arch = "i386" ]; then
arch="i686"
fi
cat <<EOF >> $path/config
lxc.utsname = $name
lxc.tty = 4
lxc.pts = 1024
lxc.rootfs = $rootfs
lxc.mount = $path/fstab
lxc.arch = $arch
lxc.cap.drop = sys_module mac_admin
lxc.cgroup.devices.deny = a
# Allow any mknod (but not using the node)
lxc.cgroup.devices.allow = c *:* m
lxc.cgroup.devices.allow = b *:* m
# /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
#fuse
lxc.cgroup.devices.allow = c 10:229 rwm
#tun
lxc.cgroup.devices.allow = c 10:200 rwm
#full
lxc.cgroup.devices.allow = c 1:7 rwm
#hpet
lxc.cgroup.devices.allow = c 10:228 rwm
#kvm
lxc.cgroup.devices.allow = c 10:232 rwm
EOF
cat <<EOF > $path/fstab
proc $rootfs/proc proc nodev,noexec,nosuid 0 0
sysfs $rootfs/sys sysfs defaults 0 0
EOF
return 0
}
usage()
{
cat <<EOF
$1 -h|--help [-a|--arch] [-F | --flush-cache] [-r|--release <release>]
release: lucid | maverick | natty | oneiric | precise
arch: amd64 or i386: defaults to host arch
EOF
return 0
}
options=$(getopt -o a:hp:r:n:Fi:C -l arch:,help,path:,release:,name:,flush-cache,hostid:,cloud -- "$@")
if [ $? -ne 0 ]; then
usage $(basename $0)
exit 1
fi
eval set -- "$options"
release=lucid
if [ -f /etc/lsb-release ]; then
. /etc/lsb-release
case "$DISTRIB_CODENAME" in
lucid|maverick|natty|oneiric|precise)
release=$DISTRIB_CODENAME
;;
esac
fi
arch=$(arch)
# Code taken from debootstrap
if [ -x /usr/bin/dpkg ] && /usr/bin/dpkg --print-architecture >/dev/null 2>&1; then
arch=`/usr/bin/dpkg --print-architecture`
elif type udpkg >/dev/null 2>&1 && udpkg --print-architecture >/dev/null 2>&1; then
arch=`/usr/bin/udpkg --print-architecture`
else
arch=$(arch)
if [ "$arch" = "i686" ]; then
arch="i386"
elif [ "$arch" = "x86_64" ]; then
arch="amd64"
elif [ "$arch" = "armv7l" ]; then
arch="armel"
fi
fi
hostarch=$arch
cloud=0
flushcache=0
while true
do
case "$1" in
-h|--help) usage $0 && exit 0;;
-p|--path) path=$2; shift 2;;
-n|--name) name=$2; shift 2;;
-F|--flush-cache) flushcache=1; shift 1;;
-r|--release) release=$2; shift 2;;
-a|--arch) arch=$2; shift 2;;
-i|--hostid) host_id=$2; shift 2;;
-u|--userdata) userdata=$2; shift 2;;
-C|--cloud) cloud=1; shift 1;;
--) shift 1; break ;;
*) break ;;
esac
done
if [ "$arch" == "i686" ]; then
arch=i386
fi
if [ $hostarch = "i386" -a $arch = "amd64" ]; then
echo "can't create amd64 container on i386"
exit 1
fi
if [ $arch != "i386" -a $arch != "amd64" ]; then
echo "Only i386 and amd64 are supported by the ubuntu cloud template."
exit 1
fi
if [ -z "$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
type ubuntu-cloudimg-query
type wget
# determine the url, tarball, and directory names
# download if needed
cache="/var/cache/lxc/cloud-$release"
mkdir -p $cache
url1=`ubuntu-cloudimg-query precise daily $arch --format "%{url}\n"`
url2=`echo $url1 | sed -e 's/.tar.gz/-root\0/'`
filename=`basename $url2`
mkdir -p /var/lock/subsys/
(
flock -n -x 200
cd $cache
if [ $flushcache -eq 1 ]; then
echo "Clearing the cached images"
rm -f $filename
fi
if [ ! -f $filename ]; then
wget $url2
fi
echo "Extracting rootfs"
mkdir -p $rootfs
cd $rootfs
tar -zxf $cache/$filename
if [ $cloud -eq 0 ]; then
echo "Configuring for running outside of a cloud environment"
echo "If you want to configure for a cloud evironment, please use '-- -C' to create the container"
seed_d=$rootfs/var/lib/cloud/seed/nocloud-net
rhostid=$(uuidgen | cut -c -8)
host_id=${hostid:-$rhostid}
mkdir -p $seed_d
cat > "$seed_d/meta-data" <<EOF
instance_id: lxc-$host_id
EOF
if [ ! -f $userdata ]; then
cp $userdata $seed_d/user-data
else
echo "#cloud-config" > $seed_d/user-data
if [ -z "$MIRROR" ]; then
MIRROR="http://archive.ubuntu.com/ubuntu"
fi
echo "apt-mirror: $MIRROR" >> $seed_d/user-data
fi
chroot $rootfs /usr/sbin/usermod -U ubuntu
echo "Please login as user ubuntu with password ubuntu."
else
echo "Configured for running in a cloud environment."
echo "If you do not have a meta-data service, this container will likely be useless."
fi
) 200>/var/lock/subsys/lxc-ubucloud
copy_configuration $path $rootfs $name $arch
echo "Container $name created."
exit 0
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