diskimage-builder/elements/dpkg/post-install.d/99-write-dpkg-manifest

#!/bin/bash
#
# Copyright 2014 Hewlett-Packard Development Company, L.P.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
#
set -eux
set -o pipefail

DPKG_MANIFEST_NAME=dib-manifest-dpkg-$(basename ${IMAGE_NAME})

# Write the json preamble
echo '{"packages": [' > ${DIB_MANIFEST_IMAGE_DIR}/${DPKG_MANIFEST_NAME}

# Write a json-format output for the packages installed
format='{"package": "${binary:Package}","arch": "${Architecture}","version": "${Version}","status": "${db:Status-Abbrev}"},'
# Use the configurable dpkg --show output as a manifest
dpkg-query --show --showformat="${format}" | tee -a ${DIB_MANIFEST_IMAGE_DIR}/${DPKG_MANIFEST_NAME}

# Finish off the json structure and make it easier for human inspection
sed -i -e 's/,$/\n]}/g' -e 's/\(},\)/    \1\n/g' ${DIB_MANIFEST_IMAGE_DIR}/${DPKG_MANIFEST_NAME}