build

#!/bin/bash -e

lookup() { jq -r ''$1' // empty' build.json; }

while getopts ":s:k:t:p:dhv-:" o; do
  case "${o}" in
    (-)
      case "${OPTARG}" in
        (dry-run) dry_run=1 ;;
        (help) print_help=1 ;;
        (version) print_version=1 ;;
        (source=*) source_id="${OPTARG#*=}" ;;
        (kernel=*) kernel_id="${OPTARG#*=}" ;;
        (template=*) template="${OPTARG#*=}" ;;
        (provider=*) provider="${OPTARG#*=}" ;;
        (*)
          echo unknown option: "${OPTARG%=*}";
          exit 1
          ;;
      esac
      ;;
    (d) dry_run=1 ;;
    (h) print_help=1 ;;
    (v) print_version=1 ;;
    (s) source_id=$OPTARG ;;
    (k) kernel_id=$OPTARG ;;
    (t) template=$OPTARG ;;
    (p) provider=$OPTARG ;;
    (*)
      echo unknown option: "${o}";
      exit 1
      ;;
  esac
done

if [ ! -z "$print_help" ]; then
  echo "
  usage: build [options]

  options:
        -h  --help              display this message
        -v  --version           display version
        -p  --template=<name>   set template (aws, vagrant, or digitalocean)
        -s  --source=<id>       set source id (defined in build.json)
        -k  --kernel=<version>  set kernel version
        -p  --provider=<name>   set vagrant provider (vmware or virtualbox)
            --dry-run           process arguments, but don't build anything

  dependencies: jq, vmware fusion, virtualbox
"
  exit 0
fi

hash jq 2>/dev/null || { echo missing dependency: jq 1>&2; exit 1; }

version="$(lookup .version)"
[ -z "$print_version" ] || { echo "$version"; exit 0; }

case "$template" in
  (*aws)
    source_id="${source_id-$(lookup .default.aws_source)}"
    ami="$(lookup .aws_sources[\"$source_id\"])"
    [ -z "$ami" ] && { echo missing option: source 1>&2; exit 1; }
    options="-var source_ami=$ami templates/aws.json"
    ;;
  (d*o*)
    source_id="${source_id-$(lookup .default.digitalocean_source)}"
    image="$(lookup .digitalocean_sources[\"$source_id\"])"
    [ -z "$image" ] && { echo missing option: source 1>&2; exit 1; }
    options="-var image_id=$image templates/digitalocean.json"
    ;;
  (vag*)
    source_id="${source_id-$(lookup .default.vagrant_source)}"
    iso_url="$(lookup .vagrant_sources[\"$source_id\"].url)"
    iso_sum="$(lookup .vagrant_sources[\"$source_id\"].sum)"
    provider="${provider-$(lookup .default.vagrant_provider)}"
    if [ -z "$iso_url" ] || [ -z "$iso_sum" ]; then
      echo missing option: source 1>&2
      exit 1
    fi
    [ -z "$provider" ] || options="-only=$provider"
    options="$options -var iso_url=$iso_url -var iso_checksum=$iso_sum templates/vagrant.json"
    ;;
  (*)
    if [ -z "$template" ]; then
      echo missing option: template 1>&2
      exit 1
    else
      echo invalid option: template 1>&2
      exit 1
    fi
    ;;
esac

kernel_id="${kernel_id-$(lookup .default.kernel)}"
kernel_version="$(lookup .kernels[\"$kernel_id\"].version)"
kernel_release="$(lookup .kernels[\"$kernel_id\"].release)"
if [ -z "$kernel_version" ] || [ -z "$kernel_release" ]; then
  echo missing option: kernel 1>&2
  exit 1
fi

command="packer build -var name=mojo-$source_id-$kernel_id-$version -var kernel_version=$kernel_version -var kernel_release=$kernel_release $options"

if [ -z "$dry_run" ]; then
  $command
else
  echo $command
fi