Simple bash AMI locator

ami_locator.sh

#!/bin/bash

# AMI Locator that grabs the latest image with options you have specified.
#
# Written By: https://github.com/elocnatsirt

# Options:
# -a = AWS_PROFILE to search for images with
# -r = Operating system release (IE 7 for CentOS 7)
# -v = Operating system version (IE CentOS or Ubuntu)
# -p = Product (IE BaseImage)
# -t = Virtualization Type (hvm or paravirtual)

# Extract options and their arguments into variables.
while getopts 'a:r:v:p:t:' OPT; do
  case $OPT in
    a)  aws_profile=$OPTARG;;
    r)  os_release=$OPTARG;;
    v)  os_version=$OPTARG;;
    p)  product=$OPTARG;;
    t)  virt_type=$OPTARG;;
  esac
done

# Set defaults
aws_profile=${aws_profile:=default}
os_release=${os_release:=7}
os_version=${os_version:=CentOS}
product=${product:=BaseImage}
virt_type=${virt_type:=hvm}

# Initialize arrays
ami_ids=()
ami_dates=()
ami_json=`aws --profile ${aws_profile} ec2 describe-images --filters "Name=tag:OS_Release,Values=${os_release}" "Name=tag:OS_Version,Values=${os_version}" "Name=tag:Product,Values=${product}" "Name=virtualization-type,Values=${virt_type}" | jq .`

get_amis=`echo ${ami_json} | jq '.Images[].ImageId' | sed 's/"//g'`

# Search through AMIs and place them into the pre-defined arrays
for ami in $get_amis; do
	ami_date=`echo ${ami_json} | jq -c ".Images[] | select(.ImageId | contains (\"${ami}\"))" | jq '.CreationDate' | sed 's/"//g'`
	ami_ids+=(${ami})
	ami_dates+=(${ami_date})
done

# Get the latest AMI date in the array
IFS=$'\n'
latest_ami_date=`echo "${ami_dates[*]}" | sort -nr | head -n1`

# Match the latest ami date in the date array with the image id in the id array
for ami in "${!ami_dates[@]}"; do
  if [[ "${ami_dates[$ami]}" = "${latest_ami_date}" ]]; then
    echo "${ami_ids[$ami]}"
  fi
done

I have updated this to instead only do one AWS CLI call so it is much faster/efficient.

Obviously this depends on your tagging setup, but the base of it will find the latest AMI depending on the filters you inject.