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+#!/bin/bash -e
+
+# Copyright (c) 2016 Cisco and/or its affiliates.
+# 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.
+
+# Purpose of this script is to build a VirtualBox or QCOW2 disk image
+# for use with CSIT testing.
+#
+# As input parameters, the script takes:
+#
+# - A base Linux distribution (currently, only "ubuntu-14.04.4" is
+#   supported),
+# - A release timestamp in the format "YYYY-MM-DD" eg. "2016-05-21".
+#   This timestamp MUST reference to a list of packages (APT, PIP)
+#   that was previously generated by the "listmaker" VM and script.
+# - A path to the nested VM image.
+#
+# The bullk of the work is done by packer,
+# while this script does some of the pre- and post-processing.
+# Steps executed are:
+#
+# 1.) Determine if building a QCOW or VirtualBox image. Currently,
+#     we build a QCOW image if VIRL_* environment variables are
+#     present (and we therefore assume we are building for VIRL),
+#     or VirtualBox otherwise.
+#
+# 2.) Download packer, if not already installed.
+#
+# 3.) Download APT and PIP packages as required for the image.
+#     We're downloading them here, rather than letting the VM
+#     download them off the public internet, for two reasons:
+#     a.) This allows us to keep and cache packets between runs
+#         and download them only once,
+#     b.) This means only the build host needs a working proxy
+#         configuration and we do not need to worry about setting
+#         a proxy inside the VM.
+#
+# 4.) Link the nested VM image into the main VM's temp directory
+#
+# 5.) Create Version and Changelog files
+#
+# 6.) Run Packer. Packer, in turn, will:
+#     6.1.) Download the Operating System ISO image,
+#     6.2.) Start a VM using the selected hypervisor (VirtualBox or Qemu),
+#     6.3.) Boot the VM using the ISO image and send initial keystrokes
+#           to initiate installation using a Preseed or Kickstart file,
+#     6.4.) Drive the installation using until the point the VM is reachable
+#           over SSH,
+#     6.5.) Copy the temporary directory populated in steps 3-5 above to the VM,
+#     6.6.) Run a script on the VM that performs post-installation:
+#           6.6.1.) Install selected .deb packages
+#           6.6.2.) Install PIP packages as per requirements.txt file
+#           6.6.3.) Install nested VM image and VERSION/CHANGELOG files
+#     6.7.) Run a script on VM that creates a Vagrant user (VirtualBox only)
+#     6.8.) Run a script on VM that performs clean-up:
+#           6.8.1.) Remove any temporary files created,
+#           6.8.2.) Remove SSH host-keys
+#           6.8.3.) Remove root user password
+#           6.8.4.) Shut down the VM
+#     6.9.) [TODO]: Upload the image to VIRL (QCOW only), -or-
+#           Convert the image into a Vagrant box (VirtualBox only), and
+#           [TODO/FIX]: Upload the Vagrant box to Atlas (VirtualBox only)
+#
+# 7.) Clean up
+
+###
+### 0. Set constants and verify parameters.
+###
+cd $(dirname $0)
+BUILD_DIR="$(pwd)/build"
+PACKER_DIR="${BUILD_DIR}/packer"
+
+RPM_CACHE_DIR="${BUILD_DIR}/cache/rpm"
+PIP_CACHE_DIR="${BUILD_DIR}/cache/pip"
+
+PACKER_TEMPLATE="centos-7.3-1611.json"
+LISTS_DIR="$(dirname $0)/lists"
+
+function syntax {
+  echo 'Syntax: $0 <Operating System> <Release> <Nested VM image>'
+  echo
+  echo '<Operating System>: Base distro, eg. ubuntu-14.04.4'
+  echo '<Release>:          Release timestamp, eg. 2016-05-21'
+  echo '<Nested VM image>:  Path to nested VM image'
+
+  exit 1
+}
+
+## Parse command line options
+
+OS=$1
+RELDATE=$2
+NESTED_IMG=$3
+
+if [ "$3" = "" ]
+then
+  syntax
+fi
+
+## Identify version by looking at topmost version statement in CHANGELOG
+
+VERSION=$(cat $(dirname $0)/CHANGELOG  | grep '^## ' | head -1 | \
+  sed -e 's/.*\[\(.*\)\].*/\1/')
+if [ "${VERSION}" = "" ]
+then
+  echo "Unable to determine build version from CHANGELOG file. Make sure"
+  echo "that there is an entry for the most recent version in CHANGELOG,"
+  echo "and that the entry is formated like"
+  echo
+  echo "## [1.0] - 2016-05-20"
+  exit 1
+fi
+RELEASE="csit-${OS}_${RELDATE}_${VERSION}"
+
+OUTPUT_DIR="${BUILD_DIR}/output/${RELEASE}"
+LIST="${LISTS_DIR}/${OS}_${RELDATE}_${VERSION}"
+
+if [ ! -d "${LIST}" ]
+then
+  echo "${LIST} not found"
+  syntax
+  exit 1
+fi
+if [ ! -f $NESTED_IMG ]
+then
+  echo "Nested image $NESTED_IMG not found"
+  syntax
+  exit 1
+fi
+
+ATLAS_RELDATE=${RELDATE//-}
+ATLAS_VERSION="${ATLAS_RELDATE}.${VERSION}"
+
+# Find an MD5 checksum utility
+
+MD5UTIL=$(which md5sum) || MD5UTIL=$(which md5)
+if [ $? -ne 0 ]
+then
+  echo "No MD5 utility found."
+  echo "Please make sure you either have \"md5sum\" or \"md5\" installed."
+  exit 1
+fi
+
+###
+### 1. Determine build target.
+###
+if [ "$VIRL_USER" = "" ] || [ "$VIRL_PASSWORD" = "" ]
+then
+  OUTPUT_PROVIDER="virtualbox"
+else
+  OUTPUT_PROVIDER="qemu"
+fi
+
+echo "Building version $VERSION for ${OUTPUT_PROVIDER}"
+echo "Release ${RELEASE}"
+echo "Using Nested VM image: ${NESTED_IMG}"
+echo
+
+
+###
+### 2. Download and extract packer, if not already installed
+###
+packer_os=$(uname -s)
+if [ "$packer_os" = "Darwin" ]
+then
+  packer_url="https://releases.hashicorp.com/packer/0.10.1/packer_0.10.1_darwin_amd64.zip"
+elif [ "$packer_os" = "Linux" ]
+then
+  packer_url="https://releases.hashicorp.com/packer/0.10.1/packer_0.10.1_linux_amd64.zip"
+fi
+
+mkdir -p $BUILD_DIR
+wget -P ${PACKER_DIR} -N ${packer_url}
+
+unzip -n ${PACKER_DIR}/packer*zip -d ${PACKER_DIR}
+
+###
+### 3. Download RPM and PIP packages, and cache them
+###    Verify downloaded RPM packages.
+###    Link required packages into a temp directory for the VM image.
+###
+
+
+rm -fr ${OUTPUT_DIR}
+mkdir -p ${OUTPUT_DIR}/temp/rpm
+mkdir -p ${RPM_CACHE_DIR}
+
+RPM_FILE="${LIST}/rpm-packages.txt"
+###
+### Copy rpm package list to cache dir because we are going to use yum on the image
+###
+echo cp $RPM_FILE ${RPM_CACHE_DIR}
+cp $RPM_FILE ${RPM_CACHE_DIR}
+ln ${RPM_CACHE_DIR}/rpm-packages.txt ${OUTPUT_DIR}/temp/rpm/rpm-packages.txt
+
+## PIP
+
+mkdir -p ${PIP_CACHE_DIR}
+
+# Let PIP do the work of downloading and verifying packages
+pip install --download ${PIP_CACHE_DIR} -r ${LIST}/pip-requirements.txt
+
+# Link packages and requirements file into VM's temp directory
+mkdir -p ${OUTPUT_DIR}/temp/pip
+ln ${PIP_CACHE_DIR}/* ${OUTPUT_DIR}/temp/pip/
+ln ${LIST}/pip-requirements.txt ${OUTPUT_DIR}/temp/requirements.txt
+
+###
+### 4. Link the nested VM image
+###
+rm -fr ${OUTPUT_DIR}/temp/nested-vm
+mkdir ${OUTPUT_DIR}/temp/nested-vm
+ln $NESTED_IMG ${OUTPUT_DIR}/temp/nested-vm/
+
+###
+### 5. Create Version and Changelog files
+###
+
+echo ${RELEASE} > ${OUTPUT_DIR}/temp/VERSION
+ln CHANGELOG ${OUTPUT_DIR}/temp/CHANGELOG
+
+###
+### 6. Run packer
+###
+export PACKER_LOG=1
+export PACKER_LOG_PATH=${OUTPUT_DIR}/packer.log
+${PACKER_DIR}/packer build -var "release=${RELEASE}" \
+ -only ${RELEASE}-${OUTPUT_PROVIDER} \
+ -var "output_dir=${OUTPUT_DIR}/packer" \
+ -var "temp_dir=${OUTPUT_DIR}/temp" \
+ -var "atlas_version=${ATLAS_VERSION}" \
+ -force \
+ -machine-readable ${PACKER_TEMPLATE}
+
+# TODO: Need to figure out "packer push" later. Currently keeps failing.
+# ${PACKER_DIR}/packer push -name ckoester/test123 -var "release=${RELEASE}" \
+#   -var "output_dir=${OUTPUT_DIR}/packer" \
+#   -var "temp_dir=${OUTPUT_DIR}/temp" \
+#   ${PACKER_TEMPLATE}
+
+###
+### 7. Clean up
+###
+rm -fr ${OUTPUT_DIR}/temp
+
+echo "Done."
+echo "Artifacts:"
+echo
+ls -lR ${OUTPUT_DIR}