Get AWS AMI ID for CoreOS channels

coreid.sh

#!/bin/bash

# CoreOS channel ["stable" | "beta" | "alpha"]
channel=${1:-"alpha"}
# AWS AMI disk backing ["pv" | "hvm"]
disk=hvm

# Use default us-east-1 region
region=${2:-"us-east-1"}

ami_id=$(curl --silent --location http://$channel.release.core-os.net/amd64-usr/current/coreos_production_ami_all.json | grep -A 2 $region | grep $disk | cut -d"\"" -f4)
[ -z "$ami_id" ] && echo "FAIL: region $region not found or doesn't include a $channel, $disk backed CoreOS AMI" && exit 1

echo "channel,region,build,disk,id,ami,url"
echo "$channel,$region,$build,$disk,$ami_id,https://console.aws.amazon.com/ec2/home?region=$region#launchAmi=$ami_id"

exit 0