#!/bin/bash -eux
# vi: ts=4 expandtab
#
# Generate OVA images
#
# OVA images are, by defintiion a tarball consisting of a disk image, OVF file
# and checksums. This step produces an OVA that is suitable for use with
# Cloud's that support the OVF specification.
#
# 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

# Lets be safe about this
scratch_d=$(mktemp -d)
trap "rm -rf ${scratch_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:])

# Put our vmdk in place for OVA conversion
prefix="${distro}-${suite}-${version}-cloudimg"
vmdk_f="${scratch_d}/${prefix}.vmdk"
cp ${base_vmdk} ${vmdk_f}

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

# Populate the OVF template
ovf="${scratch_d}/${prefix}.ovf"
cp ${my_d}/ovf/ubuntu-ova-v1-vmdk.tmpl ${ovf}
serial_stamp=$(date +%Y%m%d)
sed -i "${ovf}" \
    -e "s/@@NAME@@/${prefix}-${serial_stamp}/g" \
	-e "s/@@FILENAME@@/${vmdk_f##*/}/g" \
    -e "s/@@VMDK_FILE_SIZE@@/${vmdk_size}/g" \
    -e "s/@@VMDK_CAPACITY@@/${vmdk_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"

# Get the checksums
vmdk_sha256=$(sha256sum ${vmdk_f} | cut -d' ' -f1)
ovf_sha256=$(sha256sum ${ovf} | cut -d' ' -f1)

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

# Now create the OVA
echo "Creating OVA with the following attributes:"
cat <<EOM
OVA information:
    Name:        ${prefix}
    Size:        ${vmdk_size}
    Capacity:    ${vmdk_capacity}
    VMDK Name:   ${vmdk_f##*/}
    VMDK SHA256: ${vmdk_sha256}
    OVF SHA256:  ${ovf_sha256}
EOM

tar -C ${scratch_d} \
    -cf ${cur_d}/livecd.ubuntu-cpc.ova \
    ${prefix}.ovf \
    ${prefix}.mf \
    ${vmdk_f##*/}