#!/bin/bash

cmdname=$(basename $0)
function usage(){
  echo "Usage: ${cmdname} [profile] [ap-northeast-1] [Instance ID] [AMI Name]" 1>&2
}
if [ $# -lt 4 ]; then
  usage
  exit 1
fi
_PROFILE=${1}
_REGION=${2}
_INSTANCE=${3}
_AMI_NAME=${4}

# If specified image is available, return "available".
function describe_image_state(){
  aws --profile ${_PROFILE} --region ${_REGION} \
    ec2 describe-images \
    --image-ids "${1}" |\
      jq -r ".Images[].State"
}

_AMI_ID=`aws --profile ${_PROFILE} --region ${_REGION} \
          ec2 create-image --instance-id ${_INSTANCE} --name ${_AMI_NAME} --no-reboot |\
            jq -r ".ImageId"`
date
echo "ImageID: ${_AMI_ID} Creating..."

while [ `describe_image_state ${_AMI_ID}` != "available" ]
do
  sleep 1
  echo -n ". "
done

echo ""
echo "Image creation finished:"
date