describe-amazon-linux-images.rb

#!/usr/bin/env ruby

require "aws-sdk-core"
require "json"

ami_list = { "AWSAmazonLinuxAMI" => {} }

aws = Aws::EC2::Client.new(:region => 'us-east-1')
aws.describe_regions.regions.each do |region|
  #next unless region.region_name == "ap-northeast-1"
  ec2 = Aws::EC2::Client.new(:region => region.region_name)
  latest_ver_of = {}
  latest_images = {}

  images = ec2.describe_images(
           :owners => ["amazon"],
           filters: [
             { name: "state", values: ["available"] },
             { name: "image-type", values: ["machine"] },
             { name: "root-device-type", values: ["ebs"] },
             { name: "architecture", values: ["x86_64"] },
             { name: "virtualization-type", values: ["hvm"] },
             { name: "name", values: ["amzn-ami*"] },
           ]).images
  images.each do |image|
    next if image.platform == "windows"
    next if image.name.include?("minimal")
    next if image.name.include?("-pv-")
    next if image.name.include?("vpc-nat")
    next unless image.name.include?("gp2")

    vers = []
    begin
      vers = image.name.match(/(\d+)\.(\d+)\.(\d+)/).to_a
    rescue => e
      $stderr.puts e
    end
    ami_majorver = vers.values_at(1,2).join
    ami_minorver = vers.values_at(1,2,3).join
    if latest_ver_of[ami_majorver].nil? || ami_minorver > latest_ver_of[ami_majorver]
      latest_images[ami_majorver] = image.image_id
      latest_ver_of[ami_majorver] = ami_minorver
    end
  end

  ami_list["AWSAmazonLinuxAMI"][region.region_name] = Hash[latest_images.sort]
end

puts JSON.dump(ami_list)