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lxc-debian.in
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lxc-debian.in
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#!/bin/bash
#
# lxc: linux Container library
# Authors:
# Daniel Lezcano <daniel.lezcano@free.fr>
# 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
# Detect use under userns (unsupported)
for arg in "$@"; do
[ "$arg" = "--" ] && break
if [ "$arg" = "--mapped-uid" -o "$arg" = "--mapped-gid" ]; then
echo "This template can't be used for unprivileged containers." 1>&2
echo "You may want to try the \"download\" template instead." 1>&2
exit 1
fi
done
# Make sure the usual locations are in PATH
export PATH=$PATH:/usr/sbin:/usr/bin:/sbin:/bin
export GREP_OPTIONS=""
MIRROR=${MIRROR:-http://http.debian.net/debian}
SECURITY_MIRROR=${SECURITY_MIRROR:-http://security.debian.org/}
LOCALSTATEDIR="@LOCALSTATEDIR@"
LXC_TEMPLATE_CONFIG="@LXCTEMPLATECONFIG@"
# Allows the lxc-cache directory to be set by environment variable
LXC_CACHE_PATH=${LXC_CACHE_PATH:-"$LOCALSTATEDIR/cache/lxc"}
configure_debian()
{
rootfs=$1
hostname=$2
# squeeze only has /dev/tty and /dev/tty0 by default,
# therefore creating missing device nodes for tty1-4.
for tty in $(seq 1 4); do
if [ ! -e $rootfs/dev/tty$tty ]; then
mknod $rootfs/dev/tty$tty c 4 $tty
fi
done
# configure the inittab
cat <<EOF > $rootfs/etc/inittab
id:3:initdefault:
si::sysinit:/etc/init.d/rcS
l0:0:wait:/etc/init.d/rc 0
l1:1:wait:/etc/init.d/rc 1
l2:2:wait:/etc/init.d/rc 2
l3:3:wait:/etc/init.d/rc 3
l4:4:wait:/etc/init.d/rc 4
l5:5:wait:/etc/init.d/rc 5
l6:6:wait:/etc/init.d/rc 6
# Normally not reached, but fallthrough in case of emergency.
z6:6:respawn:/sbin/sulogin
1:2345:respawn:/sbin/getty 38400 console
c1:12345:respawn:/sbin/getty 38400 tty1 linux
c2:12345:respawn:/sbin/getty 38400 tty2 linux
c3:12345:respawn:/sbin/getty 38400 tty3 linux
c4:12345:respawn:/sbin/getty 38400 tty4 linux
p6::ctrlaltdel:/sbin/init 6
p0::powerfail:/sbin/init 0
EOF
# symlink mtab
[ -e "$rootfs/etc/mtab" ] && rm $rootfs/etc/mtab
ln -s /proc/self/mounts $rootfs/etc/mtab
# disable selinux in debian
mkdir -p $rootfs/selinux
echo 0 > $rootfs/selinux/enforce
# configure the network using the dhcp
cat <<EOF > $rootfs/etc/network/interfaces
auto lo
iface lo inet loopback
auto eth0
iface eth0 inet dhcp
EOF
# set the hostname
cat <<EOF > $rootfs/etc/hostname
$hostname
EOF
# reconfigure some services
# remove pointless services in a container
chroot $rootfs /usr/sbin/update-rc.d -f checkroot.sh disable
chroot $rootfs /usr/sbin/update-rc.d -f umountfs disable
chroot $rootfs /usr/sbin/update-rc.d -f hwclock.sh disable
chroot $rootfs /usr/sbin/update-rc.d -f hwclockfirst.sh disable
# generate new SSH keys
if [ -x $rootfs/var/lib/dpkg/info/openssh-server.postinst ]; then
cat > $rootfs/usr/sbin/policy-rc.d << EOF
#!/bin/sh
exit 101
EOF
chmod +x $rootfs/usr/sbin/policy-rc.d
if [ -f $rootfs/etc/init/ssh.conf ]; then
mv $rootfs/etc/init/ssh.conf $rootfs/etc/init/ssh.conf.disabled
fi
rm -f $rootfs/etc/ssh/ssh_host_*key*
DPKG_MAINTSCRIPT_PACKAGE=openssh DPKG_MAINTSCRIPT_NAME=postinst chroot $rootfs /var/lib/dpkg/info/openssh-server.postinst configure
sed -i "s/root@$(hostname)/root@$hostname/g" $rootfs/etc/ssh/ssh_host_*.pub
if [ -f "$rootfs/etc/init/ssh.conf.disabled" ]; then
mv $rootfs/etc/init/ssh.conf.disabled $rootfs/etc/init/ssh.conf
fi
rm -f $rootfs/usr/sbin/policy-rc.d
fi
# 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
echo "root:root" | chroot $rootfs chpasswd
echo "Root password is 'root', please change !"
return 0
}
write_sourceslist()
{
local rootfs="$1"; shift
local release="$1"; shift
local arch="$1"; shift
local prefix="deb"
if [ -n "${arch}" ]; then
prefix="deb [arch=${arch}]"
fi
cat >> "${rootfs}/etc/apt/sources.list" << EOF
${prefix} $MIRROR ${release} main contrib non-free
EOF
if [ "$release" != "unstable" -a "$release" != "sid" ]; then
cat >> "${rootfs}/etc/apt/sources.list" << EOF
${prefix} $SECURITY_MIRROR ${release}/updates main contrib non-free
EOF
fi
}
install_packages()
{
local rootfs="$1"; shift
local packages="$*"
chroot ${rootfs} apt-get update
if [ -n "${packages}" ]; then
chroot ${rootfs} apt-get install --force-yes -y --no-install-recommends ${packages}
fi
}
configure_debian_systemd()
{
path=$1
rootfs=$2
# this only works if we have getty@.service to manipulate
if [ -f ${rootfs}/lib/systemd/system/getty\@.service ]; then
sed -e 's/^ConditionPathExists=/# ConditionPathExists=/' \
-e 's/After=dev-%i.device/After=/' \
< ${rootfs}/lib/systemd/system/getty\@.service \
> ${rootfs}/etc/systemd/system/getty\@.service
fi
# just in case systemd is not installed
mkdir -p ${rootfs}/{lib,etc}/systemd/system
mkdir -p ${rootfs}/etc/systemd/system/getty.target.wants
# Fix getty-static-service as debootstrap does not install dbus
if [ -e $rootfs//lib/systemd/system/getty-static.service ] ; then
sed 's/ getty@tty[5-9].service//g' $rootfs/lib/systemd/system/getty-static.service | sed 's/\(tty2-tty\)[5-9]/\14/g' > $rootfs/etc/systemd/system/getty-static.service
fi
# This function has been copied and adapted from lxc-fedora
rm -f ${rootfs}/etc/systemd/system/default.target
chroot ${rootfs} ln -s /dev/null /etc/systemd/system/udev.service
chroot ${rootfs} ln -s /dev/null /etc/systemd/system/systemd-udevd.service
chroot ${rootfs} ln -s /lib/systemd/system/multi-user.target /etc/systemd/system/default.target
# Make systemd honor SIGPWR
chroot ${rootfs} ln -s /lib/systemd/system/halt.target /etc/systemd/system/sigpwr.target
# Setup getty service on the 4 ttys we are going to allow in the
# default config. Number should match lxc.tty
( cd ${rootfs}/etc/systemd/system/getty.target.wants
for i in 1 2 3 4 ; do ln -sf ../getty\@.service getty@tty${i}.service; done )
return 0
}
cleanup()
{
rm -rf $cache/partial-$release-$arch
rm -rf $cache/rootfs-$release-$arch
}
download_debian()
{
packages=\
ifupdown,\
locales,\
libui-dialog-perl,\
dialog,\
isc-dhcp-client,\
netbase,\
net-tools,\
iproute,\
openssh-server
cache=$1
arch=$2
release=$3
trap cleanup EXIT SIGHUP SIGINT SIGTERM
# check the mini debian was not already downloaded
mkdir -p "$cache/partial-$release-$arch"
if [ $? -ne 0 ]; then
echo "Failed to create '$cache/partial-$release-$arch' directory"
return 1
fi
# download a mini debian into a cache
echo "Downloading debian minimal ..."
debootstrap --verbose --variant=minbase --arch=$arch \
--include=$packages \
"$release" "$cache/partial-$release-$arch" $MIRROR
if [ $? -ne 0 ]; then
echo "Failed to download the rootfs, aborting."
return 1
fi
mv "$1/partial-$release-$arch" "$1/rootfs-$release-$arch"
echo "Download complete."
trap EXIT
trap SIGINT
trap SIGTERM
trap SIGHUP
return 0
}
copy_debian()
{
cache=$1
arch=$2
rootfs=$3
release=$4
# make a local copy of the minidebian
echo -n "Copying rootfs to $rootfs..."
mkdir -p $rootfs
rsync -Ha "$cache/rootfs-$release-$arch"/ $rootfs/ || return 1
return 0
}
install_debian()
{
rootfs=$1
release=$2
arch=$3
cache="$4/debian"
mkdir -p $LOCALSTATEDIR/lock/subsys/
(
flock -x 9
if [ $? -ne 0 ]; then
echo "Cache repository is busy."
return 1
fi
echo "Checking cache download in $cache/rootfs-$release-$arch ... "
if [ ! -e "$cache/rootfs-$release-$arch" ]; then
download_debian $cache $arch $release
if [ $? -ne 0 ]; then
echo "Failed to download 'debian base'"
return 1
fi
fi
copy_debian $cache $arch $rootfs $release
if [ $? -ne 0 ]; then
echo "Failed to copy rootfs"
return 1
fi
return 0
) 9>$LOCALSTATEDIR/lock/subsys/lxc-debian
return $?
}
copy_configuration()
{
path=$1
rootfs=$2
hostname=$3
arch=$4
# Generate the configuration file
# 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
## Add all the includes
echo "" >> $path/config
echo "# Common configuration" >> $path/config
if [ -e "${LXC_TEMPLATE_CONFIG}/debian.common.conf" ]; then
echo "lxc.include = ${LXC_TEMPLATE_CONFIG}/debian.common.conf" >> $path/config
fi
if [ -e "${LXC_TEMPLATE_CONFIG}/debian.${release}.conf" ]; then
echo "lxc.include = ${LXC_TEMPLATE_CONFIG}/debian.${release}.conf" >> $path/config
fi
## Add the container-specific config
echo "" >> $path/config
echo "# Container specific configuration" >> $path/config
grep -q "^lxc.rootfs" $path/config 2> /dev/null || echo "lxc.rootfs = $rootfs" >> $path/config
cat <<EOF >> $path/config
lxc.utsname = $hostname
lxc.arch = $arch
EOF
if [ $? -ne 0 ]; then
echo "Failed to add configuration"
return 1
fi
return 0
}
post_process()
{
local rootfs="$1"; shift
local release="$1"; shift
local arch="$1"; shift
local hostarch="$1"; shift
local packages="$*"
# Disable service startup
cat > ${rootfs}/usr/sbin/policy-rc.d << EOF
#!/bin/sh
exit 101
EOF
chmod +x ${rootfs}/usr/sbin/policy-rc.d
# If the container isn't running a native architecture, setup multiarch
if [ "${arch}" != "${hostarch}" ]; then
mkdir -p ${rootfs}/etc/dpkg/dpkg.cfg.d
echo "foreign-architecture ${hostarch}" > ${rootfs}/etc/dpkg/dpkg.cfg.d/lxc-multiarch
fi
# Write a new sources.list containing both native and multiarch entries
> ${rootfs}/etc/apt/sources.list
if [ "${arch}" = "${hostarch}" ]; then
write_sourceslist ${rootfs} ${release} ${arch}
else
write_sourceslist ${rootfs} ${release}
fi
# Install Packages in container
if [ -n "${packages}" ]; then
local pack_list="`echo ${packages} | sed 's/,/ /g'`"
echo "Installing packages: ${pack_list}"
install_packages ${rootfs} ${pack_list}
fi
# Re-enable service startup
rm ${rootfs}/usr/sbin/policy-rc.d
# reconfigure locales
if [ -z "$LANG" ]; then
cat >> $rootfs/etc/locale.gen << EOF
en_US.UTF-8 UTF-8
EOF
chroot $rootfs locale-gen en_US.UTF-8 UTF-8
chroot $rootfs update-locale LANG=en_US.UTF-8
else
encoding=$(echo $LANG | cut -d. -f2)
chroot $rootfs sed -e "s/^# \(${LANG} ${encoding}\)/\1/" \
-i /etc/locale.gen 2> /dev/null
cat >> $rootfs/etc/locale.gen << EOF
$LANG $encoding
EOF
chroot $rootfs locale-gen $LANG $encoding
chroot $rootfs update-locale LANG=$LANG
fi
# end
}
clean()
{
cache=${LXC_CACHE_PATH:-"$LOCALSTATEDIR/cache/lxc/debian"}
if [ ! -e $cache ]; then
exit 0
fi
# lock, so we won't purge while someone is creating a repository
(
flock -x 9
if [ $? != 0 ]; then
echo "Cache repository is busy."
exit 1
fi
echo -n "Purging the download cache..."
rm --preserve-root --one-file-system -rf $cache && echo "Done." || exit 1
exit 0
) 9>$LOCALSTATEDIR/lock/subsys/lxc-debian
}
usage()
{
cat <<EOF
Template specific options can be passed to lxc-create after a '--' like this:
lxc-create --name=NAME [-lxc-create-options] -- [-template-options]
Usage: $1 -h|--help -p|--path=<path> [-c|--clean] [-a|--arch=<arch>] [-r|--release=<release>]
[--mirror=<mirror>] [--security-mirror=<security mirror>]
[--package=<package_name1,package_name2,...>]
Options :
-h, --help print this help text
-p, --path=PATH directory where config and rootfs of this VM will be kept
-a, --arch=ARCH The container architecture. Can be one of: i686, x86_64,
amd64, armhf, armel, powerpc. Defaults to host arch.
-r, --release=RELEASE Debian release. Can be one of: squeeze, wheezy, jessie, sid.
Defaults to current stable.
--mirror=MIRROR Debian mirror to use during installation. Overrides the MIRROR
environment variable (see below).
--security-mirror=SECURITY_MIRROR
Debian mirror to use for security updates. Overrides the
SECURITY_MIRROR environment variable (see below).
--packages=PACKAGE_NAME1,PACKAGE_NAME2,...
List of additional packages to install. Comma separated, without space.
-c, --clean only clean up the cache and terminate
Environment variables:
MIRROR The Debian package mirror to use. See also the --mirror switch above.
Defaults to '$MIRROR'
SECURITY_MIRROR The Debian package security mirror to use. See also the --security-mirror switch above.
Defaults to '$SECURITY_MIRROR'
EOF
return 0
}
options=$(getopt -o hp:n:a:r:c -l arch:,clean,help,mirror:,name:,packages:,path:,release:,rootfs:,security-mirror: -- "$@")
if [ $? -ne 0 ]; then
usage $(basename $0)
exit 1
fi
eval set -- "$options"
if which dpkg > /dev/null 2>&1 ; then
arch=$(dpkg --print-architecture)
else
arch=$(uname -m)
if [ "$arch" = "i686" ]; then
arch="i386"
elif [ "$arch" = "x86_64" ]; then
arch="amd64"
elif [ "$arch" = "armv7l" ]; then
arch="armhf"
fi
fi
hostarch=$arch
while true
do
case "$1" in
-h|--help) usage $0 && exit 1;;
--) shift 1; break ;;
-a|--arch) arch=$2; shift 2;;
-c|--clean) clean=1; shift 1;;
--mirror) MIRROR=$2; shift 2;;
-n|--name) name=$2; shift 2;;
--packages) packages=$2; shift 2;;
-p|--path) path=$2; shift 2;;
-r|--release) release=$2; shift 2;;
--rootfs) rootfs=$2; shift 2;;
--security-mirror) SECURITY_MIRROR=$2; shift 2;;
*) break ;;
esac
done
if [ ! -z "$clean" -a -z "$path" ]; then
clean || exit 1
exit 0
fi
if [ "$arch" = "i686" ]; then
arch=i386
fi
if [ "$arch" = "x86_64" ]; then
arch=amd64
fi
if [ $hostarch = "i386" -a $arch = "amd64" ]; then
echo "can't create $arch container on $hostarch"
exit 1
fi
if [ $hostarch = "armhf" -o $hostarch = "armel" ] && \
[ $arch != "armhf" -a $arch != "armel" ]; then
echo "can't create $arch container on $hostarch"
exit 1
fi
if [ $hostarch = "powerpc" -a $arch != "powerpc" ]; then
echo "can't create $arch container on $hostarch"
exit 1
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
current_release=`wget ${MIRROR}/dists/stable/Release -O - 2> /dev/null | head |awk '/^Codename: (.*)$/ { print $2; }'`
release=${release:-${current_release}}
valid_releases=('squeeze' 'wheezy' 'jessie' 'stretch' 'sid')
if [[ ! "${valid_releases[*]}" =~ (^|[^[:alpha:]])$release([^[:alpha:]]|$) ]]; then
echo "Invalid release ${release}, valid ones are: ${valid_releases[*]}"
exit 1
fi
# detect rootfs
config="$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
install_debian $rootfs $release $arch $LXC_CACHE_PATH
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 $name $arch
if [ $? -ne 0 ]; then
echo "failed write configuration file"
exit 1
fi
configure_debian_systemd $path $rootfs
post_process ${rootfs} ${release} ${arch} ${hostarch} ${packages}
if [ ! -z "$clean" ]; then
clean || exit 1
exit 0
fi