build.sh

#!/bin/bash

set -e

if ! hash packer &> /dev/null
then
    echo "packer could not be found, install from https://www.packer.io/downloads"
    exit 1
fi

if ! hash cue &> /dev/null
then
    echo "cue could not be found, install from https://github.com/cue-lang/cue/releases"
    exit 1
fi

build_only=''
region='us-east1'  # gcp default
additional_vars=''
os_flavor='ubuntu'

for ((i=1;i <= $#;));do
  arg=${!i}
  case "$arg" in
    --azure)
    build_only="azure-arm.dev"
    cloud_type='azure'
    region='centralus'
    shift
  ;;
  --gcp)
    build_only="googlecompute.dev"
    cloud_type='gcp'
    additional_vars+='--var az_resource_group="" '
    shift
  ;;
  --debian)
    additional_vars+='--var use_debian=true '
    os_flavor='debian'
    shift
  ;;

  --aws)
    build_only="amazon-ebs.dev"
    cloud_type='aws'
    region='us-east-1'
    additional_vars+='--var project="" --var az_resource_group="" '
    shift
  ;;
  --arm)
    additional_vars+='--var arch=arm64 '
    shift
  ;;
  -*|--*=|*=*) # bypass flags
    i=$((i + 1))
  ;;
  *)
   echo "Unsupported argument ${arg}"
   exit 1
  ;;
  esac
done

if [[ $build_only == '' ]]; then
  echo "One of --aws|--gcp|--azure must be set"
  exit 1
fi

userdatafile=$(mktemp -u -t userdata.yml.XXXX)
echo "Exporting userdata to ${userdatafile}"
echo '#cloud-config' > $userdatafile
cuecmd=(cue export provision/cloudconfig.cue -t osf=${os_flavor} -t cloud=${cloud_type} \
    --out yaml)
echo "${cuecmd[@]}"
"${cuecmd[@]}" >> $userdatafile

packcmd=(packer build --only=$build_only --var region=$region --var userdata_file=$userdatafile
         ${additional_vars} $@ dev.pkr.hcl)

echo "${packcmd[@]}"
"${packcmd[@]}"