#!/bin/bash

# This is the code extracted from /usr/share/lxc/templates/lxc-ubuntu
# that comes with Ubuntu 12.10 which is responsible for downloading the
# rootfs files / packages
# It also installs puppet and chef on the container

set -e

suggest_flush()
{
    echo "Container upgrade failed.  The container cache may be out of date,"
    echo "in which case flushing the case (see -F in the hep output) may help."
}

cleanup()
{
    rm -rf $cache/partial
    rm -rf $cache/rootfs
}

write_sourceslist()
{
    # $1 => path to the rootfs

    MIRROR=${MIRROR:-http://archive.ubuntu.com/ubuntu}
    SECURITY_MIRROR=${SECURITY_MIRROR:-http://security.ubuntu.com/ubuntu}

    cat >> "$1/etc/apt/sources.list" << EOF
deb $MIRROR ${release} main restricted universe multiverse
deb $MIRROR ${release}-updates main restricted universe multiverse
deb $SECURITY_MIRROR ${release}-security main restricted universe multiverse
EOF
}

download_ubuntu()
{
    packages=vim,ssh,curl,wget,bash-completion,manpages,man-db,psmisc
    echo "installing packages: $packages"

    trap cleanup EXIT SIGHUP SIGINT SIGTERM
    # check the mini ubuntu was not already downloaded
    mkdir -p "$cache/partial"
    if [ $? -ne 0 ]; then
        echo "Failed to create '$cache/partial' directory"
        return 1
    fi

    # download a mini ubuntu into a cache
    echo "Downloading ubuntu $release minimal ..."
    if [ -n "$(which qemu-debootstrap)" ]; then
        qemu-debootstrap --verbose --components=main,universe --arch=$arch --include=$packages $release $cache/partial $MIRROR
    else
        debootstrap --verbose --components=main,universe --arch=$arch --include=$packages $release $cache/partial $MIRROR
    fi

    if [ $? -ne 0 ]; then
        echo "Failed to download the rootfs, aborting."
            return 1
    fi

    # Serge isn't sure whether we should avoid doing this when
    # $release == `distro-info -d`
    echo "Installing updates"
    > $cache/partial/etc/apt/sources.list
    write_sourceslist $cache/partial/ $arch

    chroot "$1/partial" apt-get update
    if [ $? -ne 0 ]; then
        echo "Failed to update the apt cache"
        return 1
    fi
    cat > "$1/partial"/usr/sbin/policy-rc.d << EOF
#!/bin/sh
exit 101
EOF
    chmod +x "$1/partial"/usr/sbin/policy-rc.d

    lxc-unshare -s MOUNT -- chroot "$1/partial" apt-get dist-upgrade -y || { suggest_flush; false; }

    rm -f "$1/partial"/usr/sbin/policy-rc.d

    chroot "$1/partial" apt-get clean

    mv "$1/partial" "$1/rootfs"
    trap EXIT
    trap SIGINT
    trap SIGTERM
    trap SIGHUP
    echo "Download complete"
    return 0
}

declare cache=`readlink -f .` \
        arch=amd64 \
        release=quantal

if [ -d "${cache}/rootfs" ]; then
  echo 'The rootfs cache has been built already, please remove it if you want to update'
  exit 1
fi

download_ubuntu $cache $arch $release

rootfs="${cache}/rootfs"

echo "installing puppet"
wget http://apt.puppetlabs.com/puppetlabs-release-precise.deb -O "${rootfs}/tmp/puppetlabs-release-${release}.deb"
chroot $rootfs dpkg -i "/tmp/puppetlabs-release-${release}.deb"
chroot $rootfs apt-get update
chroot $rootfs apt-get install puppet -y

echo "installing chef"
cat > $rootfs/tmp/install-chef.sh << EOF
#!/bin/sh
curl -L https://www.opscode.com/chef/install.sh -k | sudo bash
EOF
chmod +x $rootfs/tmp/install-chef.sh
chroot $rootfs /tmp/install-chef.sh

rm -rf $rootfs/tmp/*