Get AMI to region Mapping for CloudFormation (Copy-Paste yaml)

get-region-ami-mappings.sh

#!/usr/bin/env bash
# Runs for ~2min
# Sample output:
# $ ./get-region-ami-mappings.sh 
# ap-south-1:
#         AMI: ami-d5c18eba
# eu-west-2:
#         AMI: ami-e7d6c983
# eu-west-1:
#         AMI: ami-1a962263
# ap-northeast-2:
#         AMI: ami-1196317f
# ap-northeast-1:
#         AMI: ami-da9e2cbc
# sa-east-1:
#         AMI: ami-286f2a44
# ca-central-1:
#         AMI: ami-d29e25b6
# ap-southeast-1:
#         AMI: ami-c63d6aa5
# ap-southeast-2:
#         AMI: ami-ff4ea59d
# eu-central-1:
#         AMI: ami-bf2ba8d0
# us-east-1:
#         AMI: ami-55ef662f
# us-east-2:
#         AMI: ami-15e9c770
# us-west-1:
#         AMI: ami-a51f27c5
# us-west-2:
#         AMI: ami-bf4193c7

YAML_AMI_KEY="AMI"
IMAGE_SEARCH_STRING="amzn-ami-hvm-2017*gp2"
MAPPINGS=()

# by default queries all regions, adjust this array if needed
regions=($(aws ec2 describe-regions --query "Regions[].RegionName" \
                                    --output text))

for region in ${regions[@]}
do
    MAPPINGS+=("${region}:\n\t${YAML_AMI_KEY}: $(aws ec2 describe-images --owners amazon \
                                                             --filters Name=name,Values=$IMAGE_SEARCH_STRING \
                                                             --query "reverse(sort_by(Images, &CreationDate))[0].ImageId" \
                                                             --output text \
                                                             --region $region)\n")
done

echo -e $(printf %s "${MAPPINGS[@]}")