cfn-region-mapping.sh

#!/usr/bin/env bash

export AWS_PROFILE=<snip>

ImageDescription="Amazon Linux AMI 2017.09.1.20180115"
RegionNames=$(aws ec2 describe-regions --region eu-west-1 --query 'Regions[*].[RegionName]' --output text)

function getImages () {
  region=$1
  filters="[
    {\"Name\": \"owner-alias\", \"Values\": [\"amazon\"]},
    {\"Name\": \"image-type\", \"Values\": [\"machine\"]},
    {\"Name\": \"description\", \"Values\": [\"$ImageDescription*\"]}
  ]"
  images=$(aws ec2 describe-images --region $region --cli-input-json "{\"Filters\": $filters}")
  output=$(echo $images | jq -c ".Images | \
    map({ \
      (.Description | \
        sub(\"^$ImageDescription[[:blank:]]*\"; \"\") | \
        sub(\"^x86_64\"; \"\") | \
        gsub(\"[^0-9A-Za-z]\"; \"\")): \
      .ImageId \
    }) | \
    add | \
    {\"$region\": .}")
  echo $output
}

export ImageDescription
export -f getImages

RegionToImage=$(parallel getImages ::: $RegionNames)
echo $(echo $RegionToImage | jq -rsc add)