Shellscript to create the ubuntu-box of vagrant-lxc

build_vagrant-lxc-box_ubuntu.sh

#!/bin/bash

##################################################################################
# 1 - Prepare environments
RELEASE=trusty
ARCH=64 # OR 32
ADD_PACKAGES="vim,curl,wget,manpages,bash-completion,keychain,tmux,python-software-properties"
case ${ARCH} in
    64) BOXNAME=${RELEASE}${ARCH}
	ARCH=amd64 ;;
    32) BOXNAME=${RELEASE}
	ARCH=i386 ;;
    *)	echo wrong architecture.
	exit 1 ;;
esac
ROOTFS=/var/lib/lxc/${BOXNAME}/rootfs
AUTHKEY=$(mktemp)
wget -c -q -O ${AUTHKEY} https://raw.github.com/mitchellh/vagrant/master/keys/vagrant.pub || exit 1
trap 'echo exit...;rm -f ${AUTHKEY}' EXIT

##################################################################################
# 2 - Create the base container
sudo lxc-create -n ${BOXNAME} -t ubuntu -- \
     --release ${RELEASE} --arch ${ARCH} \
     --user 'vagrant' --password 'vagrant' \
     --auth-key ${AUTHKEY} \
     --packages ${ADD_PACKAGES}

##################################################################################
# 3 - Setup passwordless sudo
# Enable passwordless sudo for the vagrant user
if [ -f ${ROOTFS}/etc/sudoers.d/vagrant ]; then
  echo 'Skipping sudoers file creation.'
else
  echo 'Sudoers file was not found'
  echo "vagrant ALL=(ALL) NOPASSWD:ALL" | sudo tee ${ROOTFS}/etc/sudoers.d/vagrant
  sudo chmod 0440 ${ROOTFS}/etc/sudoers.d/vagrant
  echo 'Sudoers file created.'
fi

##################################################################################
# 4 - Add some goodies
# initialize environment
array (){ eval ${1:?}=\(\"\${@\:2}\"\); }

array INSTALL_PACKAGES 	# null
array REMOVE_PACKAGES  	# null
array PPA	       	# null

# install git
# array PPA+	       	ppa:git-core/ppa
array INSTALL_PACKAGES+	git-core

# install emacs24
# array PPA+	       	ppa:cassou/emacs
array INSTALL_PACKAGES+	emacs24-nox

# install aspell
array INSTALL_PACKAGES+	aspell aspell-en

# oparate package installation
[ ${#REMOVE_PACKAGES[@]} > 0 ] \
    && sudo chroot ${ROOTFS} apt-get purge --force-yes -y ${REMOVE_PACKAGES[@]}
for (( I = 0; I < ${#PPA[@]}; ++I ))
do
    sudo chroot ${ROOTFS} add-apt-repository ${PPA[$I]} -y
done
sudo chroot ${ROOTFS} apt-get update
[ ${#INSTALL_PACKAGES[@]} > 0 ] \
    && sudo chroot ${ROOTFS} apt-get install --force-yes -y --no-install-recommends ${INSTALL_PACKAGES[@]}
sudo chroot ${ROOTFS} apt-get autoremove

##################################################################################
# 5 - Free up some disk space

sudo chroot ${ROOTFS} rm -rf ${ROOTFS}/tmp/*
sudo chroot ${ROOTFS} apt-get clean

##################################################################################
# 6 - Build box package
# Set up a working dir
WDIR="./vagrant-lxc-${BOXNAME}-$(date +'%y-%m-%d')"
mkdir -p ${WDIR}

# "Compress container's rootfs"
sudo tar --numeric-owner -czf ${WDIR}/rootfs.tar.gz \
     -C /var/lib/lxc/${BOXNAME} ./rootfs || exit 1

# Prepare package contents
pushd ${WDIR}
sudo chown $USER:`id -gn` rootfs.tar.gz
wget -c -q -O lxc-config    https://raw.githubusercontent.com/fgrehm/vagrant-lxc-base-boxes/master/conf/ubuntu
wget -c -q -O metadata.json https://raw.githubusercontent.com/fgrehm/vagrant-lxc-base-boxes/master/conf/metadata.json
NOW=$(date -u)
sed -i "s/<TODAY>/${NOW}/" metadata.json

# Vagrant box!
tar -czf vagrant-lxc-${BOXNAME}.box ./lxc-config ./metadata.json ./rootfs.tar.gz && \
  rm ./lxc-config ./metadata.json ./rootfs.tar.gz || exit 1

sudo lxc-destroy -n ${BOXNAME}
popd

exit 0