インベントリに登録されているEC2のカーネルのバージョンを取得するスクリプト

fetch_kernel_version.sh

#!/bin/bash
#

set -e

function usage {
  cat <<EOF
$(basename "$0") is a tool for fetching kernel version

Usage:
    $(basename "$0") [command] [<options>]

Options:
    --profile, -p  Configured profile. You can find 'cat ~/.aws/config'
EOF
}

if [ "$#" -gt 2 ]; then
  usage
  exit 1
fi

POSITIONAL=()
while [ "$#" -gt 0 ]
do
  key="$1"

  case "${key}" in
    -p|--profile)
      PROFILE="$2"
      shift
      shift
      ;;
    -h|--help)
      usage
      shift
      shift
      ;;
    *)
      POSITIONAL+=("$1")
      shift
      ;;
  esac
done

function __fetch_kernel_version () {
  local _profile=$1
  local _instance_id=$2
  
  aws ssm list-inventory-entries \
    --region ap-northeast-1 \
    --profile $_profile \
    --instance-id $_instance_id \
    --type-name "AWS:Application" \
    --filters "Key=Name,Values=Kernel" | jq -r ".Entries[].PackageId"
}

function __fetch_instance_ids () {
  local _profile=$1
  
  aws ssm get-inventory \
    --region ap-northeast-1 \
    --profile $_profile | grep InstanceId | grep -o 'i-[a-z0-9A-Z]*'
}

echo "profile, instance_id, kernel_version"

if [ -n "$PROFILE" ]; then
  _instance_ids=$(__fetch_instance_ids $PROFILE)
  for _id in ${_instance_ids}; do
    _kernel_version=$(__fetch_kernel_version ${PROFILE} ${_id})
    echo "${PROFILE}, ${_id}, ${_kernel_version}"
  done
else
  PROFILES=$(cat ~/.aws/config | grep profile | grep -v source | awk '{print $2}' | tr -d "]")

  for _profile in ${PROFILES}; do
    _instance_ids=$(__fetch_instance_ids $_profile)
    for _id in ${_instance_ids}; do
      _kernel_version=$(__fetch_kernel_version ${_profile} ${_id})
      echo "${_profile}, ${_id}, ${_kernel_version}"
    done
  done
fi