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lxc-ubuntu-cloud.in
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lxc-ubuntu-cloud.in
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#!/bin/bash
# template script for generating ubuntu container for LXC based on released
# cloud images.
#
# Copyright © 2012 Serge Hallyn <serge.hallyn@canonical.com>
#
# 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
set -e
STATE_DIR="@LOCALSTATEDIR@"
HOOK_DIR="@LXCHOOKDIR@"
CLONE_HOOK_FN="$HOOK_DIR/ubuntu-cloud-prep"
LXC_TEMPLATE_CONFIG="@LXCTEMPLATECONFIG@"
KNOWN_RELEASES="precise trusty wily xenial yakkety"
skip_arch_check=${UCTEMPLATE_SKIP_ARCH_CHECK:-0}
# Make sure the usual locations are in PATH
export PATH=$PATH:/usr/sbin:/usr/bin:/sbin:/bin
if [ -r /etc/default/lxc ]; then
. /etc/default/lxc
fi
am_in_userns() {
[ -e /proc/self/uid_map ] || { echo no; return; }
[ "$(wc -l /proc/self/uid_map | awk '{ print $1 }')" -eq 1 ] || { echo yes; return; }
line=$(awk '{ print $1 " " $2 " " $3 }' /proc/self/uid_map)
[ "$line" = "0 0 4294967295" ] && { echo no; return; }
echo yes
}
in_userns=0
[ $(am_in_userns) = "yes" ] && in_userns=1
copy_configuration()
{
path=$1
rootfs=$2
name=$3
arch=$4
release=$5
if [ $arch = "i386" ]; then
arch="i686"
fi
# if there is exactly one veth network entry, make sure it has an
# associated hwaddr.
nics=`grep -e '^lxc\.network\.type[ \t]*=[ \t]*veth' $path/config | wc -l`
if [ $nics -eq 1 ]; then
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
fi
# Generate the configuration file
## Relocate all the network config entries
sed -i -e "/lxc.network/{w ${path}/config-network" -e "d}" $path/config
## Relocate any other config entries
sed -i -e "/lxc./{w ${path}/config-auto" -e "d}" $path/config
## Add all the includes
echo "" >> $path/config
echo "# Common configuration" >> $path/config
if [ -e "${LXC_TEMPLATE_CONFIG}/ubuntu-cloud.common.conf" ]; then
echo "lxc.include = ${LXC_TEMPLATE_CONFIG}/ubuntu-cloud.common.conf" >> $path/config
fi
if [ -e "${LXC_TEMPLATE_CONFIG}/ubuntu-cloud.${release}.conf" ]; then
echo "lxc.include = ${LXC_TEMPLATE_CONFIG}/ubuntu-cloud.${release}.conf" >> $path/config
fi
if [ $in_userns -eq 1 ] && [ -e "${LXC_TEMPLATE_CONFIG}/ubuntu-cloud.userns.conf" ]; then
echo "lxc.include = ${LXC_TEMPLATE_CONFIG}/ubuntu-cloud.userns.conf" >> $path/config
fi
## Add the container-specific config
echo "" >> $path/config
echo "# Container specific configuration" >> $path/config
[ -e "$path/config-auto" ] && cat $path/config-auto >> $path/config && rm $path/config-auto
grep -q "^lxc.rootfs" $path/config 2>/dev/null || echo "lxc.rootfs = $rootfs" >> $path/config
cat <<EOF >> $path/config
lxc.utsname = $name
lxc.arch = $arch
EOF
## Re-add the previously removed network config
echo "" >> $path/config
echo "# Network configuration" >> $path/config
cat $path/config-network >> $path/config
rm $path/config-network
# Set initial timezone as on host
if [ -f /etc/timezone ]; then
cat /etc/timezone > $rootfs/etc/timezone
chroot $rootfs dpkg-reconfigure -f noninteractive tzdata
elif [ -f /etc/sysconfig/clock ]; then
. /etc/sysconfig/clock
echo $ZONE > $rootfs/etc/timezone
chroot $rootfs dpkg-reconfigure -f noninteractive tzdata
else
echo "Timezone in container is not configured. Adjust it manually."
fi
# rmdir /dev/shm for containers that have /run/shm
# I'm afraid of doing rm -rf $rootfs/dev/shm, in case it did
# get bind mounted to the host's /run/shm. So try to rmdir
# it, and in case that fails move it out of the way.
# NOTE: This can only be removed once 12.04 goes out of support
if [ ! -L $rootfs/dev/shm ] && [ -e $rootfs/dev/shm ]; then
rmdir $rootfs/dev/shm 2>/dev/null || mv $rootfs/dev/shm $rootfs/dev/shm.bak
ln -s /run/shm $rootfs/dev/shm
fi
return 0
}
usage()
{
cat <<EOF
LXC Container configuration for Ubuntu Cloud images.
Generic Options
[ -r | --release <release> ]: Release name of container, defaults to host
[ --rootfs <path> ]: Path in which rootfs will be placed
[ -a | --arch ]: Architecture of container, defaults to host architecture
[ -T | --tarball ]: Location of tarball
[ -d | --debug ]: Run with 'set -x' to debug errors
[ -s | --stream]: Use specified stream rather than 'tryreleased'
Additionally, clone hooks can be passed through (ie, --userdata). For those,
see:
$CLONE_HOOK_FN --help
EOF
return 0
}
options=$(getopt -o a:hp:r:n:Fi:CLS:T:ds:u: -l arch:,help,rootfs:,path:,release:,name:,flush-cache,hostid:,auth-key:,cloud,no_locales,tarball:,debug,stream:,userdata:,vendordata:,mapped-uid:,mapped-gid: -- "$@")
if [ $? -ne 0 ]; then
usage $(basename $0)
exit 1
fi
eval set -- "$options"
mapped_uid=-1
mapped_gid=-1
# default release is trusty, or the systems release if recognized
release=trusty
if [ -f /etc/lsb-release ]; then
. /etc/lsb-release
rels=$(ubuntu-distro-info --supported 2>/dev/null) ||
rels="$KNOWN_RELEASES"
for r in $rels; do
[ "$DISTRIB_CODENAME" = "$r" ] && release="$r"
done
fi
# 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=$(uname -m)
if [ "$arch" = "i686" ]; then
arch="i386"
elif [ "$arch" = "x86_64" ]; then
arch="amd64"
elif [ "$arch" = "armv7l" ]; then
# note: arm images don't exist before oneiric; are called armhf in
# trusty and later; and are not supported by the query, so we don't actually
# support them yet (see check later on). When Query2 is available,
# we'll use that to enable arm images.
arch="armhf"
elif [ "$arch" = "aarch64" ]; then
arch="arm64"
elif [ "$arch" = "ppc64le" ]; then
arch="ppc64el"
fi
fi
debug=0
hostarch=$arch
cloud=0
locales=1
flushcache=0
stream="tryreleased"
cloneargs=()
while true
do
case "$1" in
-h|--help) usage $0 && exit 1;;
-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;;
-T|--tarball) tarball=$2; shift 2;;
-d|--debug) debug=1; shift 1;;
-s|--stream) stream=$2; shift 2;;
--rootfs) rootfs=$2; shift 2;;
-L|--no?locales) cloneargs[${#cloneargs[@]}]="--no-locales"; shift 1;;
-i|--hostid) cloneargs[${#cloneargs[@]}]="--hostid=$2"; shift 2;;
-u|--userdata) cloneargs[${#cloneargs[@]}]="--userdata=$2"; shift 2;;
-V|--vendordata) cloneargs[${#cloneargs[@]}]="--vendordata=$2"; shift 2;;
-C|--cloud) cloneargs[${#cloneargs[@]}]="--cloud"; shift 1;;
-S|--auth-key) cloneargs[${#cloneargs[@]}]="--auth-key=$2"; shift 2;;
--mapped-uid) mapped_uid=$2; shift 2;;
--mapped-gid) mapped_gid=$2; shift 2;;
--) shift 1; break ;;
*) break ;;
esac
done
cloneargs=( "--name=$name" "${cloneargs[@]}" )
if [ $debug -eq 1 ]; then
set -x
fi
if [ "$arch" = "i686" ]; then
arch=i386
fi
if [ "$skip_arch_check" = "0" ]; then
case "$hostarch:$arch" in
$arch:$arch) : ;; # the host == container
amd64:i386) :;; # supported "cross"
arm64:arm*) :;; # supported "cross"
armel:armhf) :;; # supported "cross"
armhf:armel) :;; # supported "cross"
*) echo "cannot create '$arch' container on hostarch '$hostarch'";
exit 1;;
esac
fi
if [ "$stream" != "daily" -a "$stream" != "released" -a "$stream" != "tryreleased" ]; then
echo "Only 'daily' and 'released' and 'tryreleased' streams are supported"
exit 1
fi
if [ -z "$path" ]; then
echo "'path' parameter is required"
exit 1
fi
if [ "$(id -u)" != "0" ]; then
echo "This script should be run as 'root'"
exit 1
fi
# detect rootfs
config="$path/config"
if [ -z "$rootfs" ]; then
if grep -q '^lxc.rootfs' $config 2>/dev/null ; then
rootfs=$(awk -F= '/^lxc.rootfs =/{ print $2 }' $config)
else
rootfs=$path/rootfs
fi
fi
type ubuntu-cloudimg-query
type wget
# determine the url, tarball, and directory names
# download if needed
# Allow the cache base to be set by environment variable
cache=${LXC_CACHE_PATH:-"$STATE_DIR/cache/lxc"}/cloud-$release
if [ $in_userns -eq 1 ]; then
STATE_DIR="$HOME/.cache/lxc"
cache=${LXC_CACHE_PATH:-"$STATE_DIR"}/cloud-$release
fi
mkdir -p $cache
if [ "$stream" = "tryreleased" ]; then
stream=released
ubuntu-cloudimg-query $release $stream $arch 1>/dev/null 2>/dev/null || stream=daily
fi
if [ -n "$tarball" ]; then
url2="$tarball"
else
if ! url1=`ubuntu-cloudimg-query $release $stream $arch --format "%{url}\n"`; then
echo "There is no download available for release=$release, stream=$stream, arch=$arch"
[ "$stream" = "daily" ] || echo "You may try with '--stream=daily'"
exit 1
fi
url2=`echo $url1 | sed -e 's/.tar.gz/-root\0/' -e 's/.tar.gz/.tar.xz/'`
fi
filename=`basename $url2`
wgetcleanup()
{
rm -f $filename
}
do_extract_rootfs() {
cd $cache
if [ $flushcache -eq 1 ]; then
echo "Clearing the cached images"
rm -f $filename
fi
trap wgetcleanup EXIT SIGHUP SIGINT SIGTERM
if [ ! -f $filename ]; then
wget $url2
fi
trap EXIT
trap SIGHUP
trap SIGINT
trap SIGTERM
echo "Extracting container rootfs"
mkdir -p $rootfs
cd $rootfs
if [ $in_userns -eq 1 ]; then
tar --anchored --exclude="dev/*" --numeric-owner -xpf "$cache/$filename"
mkdir -p $rootfs/dev/pts/
else
tar --numeric-owner -xpf "$cache/$filename"
fi
}
if [ -n "$tarball" ]; then
do_extract_rootfs
else
mkdir -p "$STATE_DIR/lock/subsys/"
(
flock -x 9
do_extract_rootfs
) 9>"$STATE_DIR/lock/subsys/lxc-ubuntu-cloud"
fi
copy_configuration $path $rootfs $name $arch $release
"$CLONE_HOOK_FN" "${cloneargs[@]}" "$rootfs"
if [ $mapped_uid -ne -1 ]; then
chown $mapped_uid $path/config
chown -R $mapped_uid $STATE_DIR
chown -R $mapped_uid $cache
fi
if [ $mapped_gid -ne -1 ]; then
chgrp $mapped_gid $path/config
chgrp -R $mapped_gid $STATE_DIR
chgrp -R $mapped_gid $cache
fi
echo "Container $name created."
exit 0
# vi: ts=4 expandtab