#!/usr/bin/env bash

_INSTANCE_ID="${YOUR_INSTANCE_ID}"
_ROOT_DEVICE="/dev/sda1"
_CHECK_INTERVAL=60

echo "処理を続行しますか? [Y/n]"
read ANSWER
case ${ANSWER} in
  [yY]) echo "処理を続行します..."
        ;;
  [nN]) echo "$(date '+%Y-%m-%d %H:%M:%S') 処理を終了します..."
        exit 0 ;;
     *) echo "$(date '+%Y-%m-%d %H:%M:%S') 処理を終了します..."
        exit 0 ;;
esac

if [ -f tmp/snapshot_ids ];then
  rm tmp/snapshot_ids
fi

for ebs in $(aws ec2 describe-instances --filters Name=instance-id,Values=${_INSTANCE_ID} --query 'Reservations[].Instances[].BlockDeviceMappings[].Ebs.VolumeId' --output text);
do
  _SNAPSHOT_ID=$(aws ec2 create-snapshot --volume-id ${ebs} | jq -r .SnapshotId)
  echo ${_SNAPSHOT_ID} >> tmp/snapshot_ids
  _DEVICE=$(aws ec2 describe-volumes --volume-ids ${ebs} --query Volumes[].Attachments[].Device --output text)
  if [ "${_DEVICE}" == "${_ROOT_DEVICE}" ];then
    aws ec2 create-tags --resources ${_SNAPSHOT_ID} --tags Key=device,Value=${_DEVICE} Key=Name,Value="OS"
  else
    aws ec2 create-tags --resources ${_SNAPSHOT_ID} --tags Key=device,Value=${_DEVICE} Key=Name,Value="DATA"
  fi
done

if [ -f tmp/snapshot_ids -a $(wc -l tmp/snapshot_ids | awk '{print $1}') == 2 ];then
  echo ${_SLACK_CHANNEL} "スナップショットの作成を開始しました..."
else
  echo ${_SLACK_CHANNEL} "スナップショットの作成に失敗しました.処理を中断します."
  exit 1
fi

aws ec2 wait snapshot-completed --snapshot-ids $(cat tmp/snapshot_ids)
if [ $? == 0 ]; then
  echo "スナップショットの作成が完了しました."
fi