#!/bin/bash -eux
# vi: ts=4 noexpandtab
#
# Generate a generic Vagrant Box.
#
# Vagrant images are essentially nothing more than OVA's with extra-metadata.
#
# We can't use the OVA's for Vagrant since Vagrant uses SSH to modify the instance.
# This build step creates a cloud-config ISO so that Cloud-Init will configure
# the initial user, creates meta-data that tells Vagrant how to interact with
# the cloud-init created users, and finally create the OVA.
#
# For this step, we re-use the VMDK's made in 040-vmdk-image.binary

cur_d=${PWD}
my_d=$(dirname $(readlink -f ${0}))

architecture=$(chroot chroot dpkg --print-architecture)
base_vmdk="livecd.ubuntu-cpc.disk1.vmdk"
case ${architecture} in
        amd64) base_vmdk="livecd.ubuntu-cpc.uefi.vmdk";;
            *) echo "OVA images are not supported for ${architecture} yet.";
               exit 0;;
esac

if [ ! -e ${base_vmdk} ]; then
	find . | grep vmdk
    exit 0
fi

# Virtualbox is needed for making a small VMDK
apt-get -qqy install genisoimage qemu-utils

# Lets be safe about this
box_d=$(mktemp -d)
seed_d=$(mktemp -d)
trap "rm -rf ${box_d} ${seed_d}" EXIT

# Used to identify bits
suite=$(chroot chroot lsb_release -c -s)
version=$(chroot chroot lsb_release --release --short)
distro=$(chroot chroot lsb_release --id --short | tr [:upper:] [:lower:])

# Get the VMDK in place
prefix="${distro}-${suite}-${version}-cloudimg"
vmdk_f="${box_d}/${prefix}.vmdk"
cp ${base_vmdk} ${vmdk_f}

# Vagrant needs a base user. We either inject the well-known SSH key
# or use password authentication. Both are ugly. So we'll use a password
# and make it random. This obviously is insecure...but at least its
# better than the alternatives.
ubuntu_user_pass=$(openssl rand -hex 12)

####################################
# Create the ConfigDrive
# This is a cloud-init piece that instructs cloud-init to configure
# a default user at first boot.

cdrom_vmdk_f="${box_d}/${prefix}-configdrive.vmdk"

# Create the user-data. This is totally insecure, but so is Vagrant. To
# mitigate this insecurity, the vagrant instance is not accessible
# except via local host.
cat > ${seed_d}/user-data <<END
#cloud-config
password: ${ubuntu_user_pass}
chpasswd: { expire: False }
ssh_pwauth: True
END

# Create the fake meta-data
cat > ${seed_d}/meta-data <<END
instance-id: iid-$(openssl rand -hex 8)
local-hostname: ubuntu-${suite}
END

# Pad the cdrom, otherwise the VMDK will be invalid
dd if=/dev/zero of=${seed_d}/bloat_file bs=1M count=10

# Create the ISO
genisoimage \
    -output ${seed_d}/seed.iso \
    -volid cidata \
    -joliet -rock \
    ${seed_d}/user-data \
    ${seed_d}/meta-data \
    ${seed_d}/bloat_file

# Make a VMDK out of the seed file.
qemu-img convert -O vmdk ${seed_d}/seed.iso ${cdrom_vmdk_f}

### END Create ConfigDrive
##########################

##########################
# VAGRANT meta-data

# Create the Vagrant file. This file is used by Vagrant to define how
# Vagrant uses Virtualbox and how Vagrant interacts with the host.
macaddr="02$(openssl rand -hex 5 | tr [:lower:] [:upper:])"
cat > ${box_d}/Vagrantfile <<EOF
# Front load the includes
include_vagrantfile = File.expand_path("../include/_Vagrantfile", __FILE__)
load include_vagrantfile if File.exist?(include_vagrantfile)

Vagrant.configure("2") do |config|
  config.vm.base_mac = "${macaddr}"
  config.ssh.username = "ubuntu"
  config.ssh.password = "${ubuntu_user_pass}"
  config.vm.synced_folder '.', '/vagrant', disabled: true
end
EOF

# Tag it as a Virtualbox Vagrant
cat > ${box_d}/metadata.json <<EOF
{
  "provider": "virtualbox"
}
EOF

# END
##########################

##########################
# Create the actual box

# Get information about the disks for the OVF
vmdk_size=$(du -b "${vmdk_f}" | cut -f1)
vmdk_capacity=$(qemu-img info "${vmdk_f}" | awk '-F[\( ]' '$1 ~ /virtual/ && $NF ~ /bytes.*/ {print$(NF-1)}')
vmdk_sha256=$(sha256sum ${vmdk_f} | cut -d' ' -f1)

cdrom_size=$(du -b "${cdrom_vmdk_f}" | cut -f1)
cdrom_capacity=$(qemu-img info "${cdrom_vmdk_f}" | awk '-F[\( ]' '$1 ~ /virtual/ && $NF ~ /bytes.*/ {print$(NF-1)}')
cdrom_sha256=$(sha256sum ${cdrom_vmdk_f} | cut -d' ' -f1)

# Populate the OVF template
ovf="${box_d}/box.ovf"
cp ${my_d}/ovf/ubuntu-ova-v1-cloudcfg-vmdk.tmpl ${ovf}
serial_stamp=$(date +%Y%m%d)
sed -i "${ovf}" \
    -e "s/@@NAME@@/${prefix}-${serial_stamp}/g" \
	-e "s/@@FILENAME1@@/${vmdk_f##*/}/g" \
    -e "s/@@VMDK_FILE_SIZE@@/${vmdk_size}/g" \
    -e "s/@@VMDK_CAPACITY@@/${vmdk_capacity}/g" \
	-e "s/@@FILENAME2@@/${cdrom_vmdk_f##*/}/g" \
    -e "s/@@VMDK_FILE_SIZE2@@/${cdrom_size}/g" \
    -e "s/@@VMDK_CAPACITY2@@/${cdrom_capacity}/g" \
    -e "s/@@NUM_CPUS@@/2/g" \
    -e "s/@@VERSION@@/${version}/g" \
    -e "s/@@DATE@@/${serial_stamp}/g" \
    -e "s/@@MEM_SIZE@@/1024/g"

ovf_sha256=$(sha256sum ${ovf} | cut -d' ' -f1)

# Generate the manifest
manifest="${box_d}/${prefix}.mf"
cat > "${manifest}" <<EOF
SHA256(${vmdk_f##*/})= ${vmdk_sha256}
SHA256(${cdrom_vmdk_f##*/})= ${cdrom_sha256}
SHA256(${ovf##*/}.ovf)= ${ovf_sha256}
EOF

# Now create the box
echo "Creating OVA with the following attributes:"
cat <<EOM
OVA information:
    Name:           ${prefix}
    Size:           ${vmdk_size}
    VMDK Name:      ${vmdk_f##*/}
    VMDK Capacity:  ${vmdk_capacity}
    VMDK SHA256:    ${vmdk_sha256}
	CDROM Name:     ${cdrom_vmdk_f##*/}
    CDROM Capacity: ${cdrom_capacity}
	CDROM SHA256:   ${cdrom_sha256}
EOM

tar -C ${box_d} \
    -cf ${cur_d}/livecd.ubuntu-cpc.vagrant.box \
    box.ovf \
	Vagrantfile \
	metadata.json \
    ${prefix}.mf \
    ${vmdk_f##*/} \
	${cdrom_vmdk_f##*/}