Interactively removes AWS snapshots that were created by CreateImage but AMI was removed.

aws-snapshots-cleanup.sh

#!/bin/bash

set -eu

AWS_ACCOUNT_ID=657433956652


echo "Snapshots exist for following images: "
aws ec2 describe-snapshots --filters Name=description,Values="Created by CreateImage*" --owner-id=$AWS_ACCOUNT_ID --output=text | grep "^SNAPSHOTS" | sed  's/.*\(ami-[0-9a-z]\+\).*/\1/' | sort | uniq | sort > /tmp/snapshot-cleanup-existing-snapshots

echo "Following images exist: "
aws ec2 describe-images --owners=$AWS_ACCOUNT_ID --output=text | grep IMAGES | sed  's/.*\(ami-[0-9a-z]\+\).*/\1/' | sort | uniq | sort > /tmp/snapshot-cleanup-existing-images

echo "Snapshots for those images can be deleted: "
ORPHAED_AMIS=$(diff /tmp/snapshot-cleanup-existing-snapshots /tmp/snapshot-cleanup-existing-images | grep "^< ami" | sed  's/.*\(ami-[0-9a-z]\+\).*/\1/' | sort | uniq)

for OAMI in $ORPHAED_AMIS
do
    echo
    echo "Removing  $OAMI:"
    aws ec2 describe-snapshots --filters Name=description,Values="Created by CreateImage*${OAMI}*" --owner-id=$AWS_ACCOUNT_ID --output=text | grep "^SNAPSHOTS"
    echo
    read -p " proceed? " -n 1 -r
    if [[ $REPLY =~ ^[Yy]$ ]]
    then
        echo " deleting..."
        SNAPSHOTS_TO_DELETE=$(aws ec2 describe-snapshots --filters Name=description,Values="Created by CreateImage*${OAMI}*" --owner-id=$AWS_ACCOUNT_ID --output=text | grep "^SNAPSHOTS" | sed  's/.*\(snap-[0-9a-z]\+\).*/\1/')

        for SNAP in $SNAPSHOTS_TO_DELETE
	do
            echo $SNAP
	    aws ec2 delete-snapshot --snapshot-id $SNAP
        done
	echo " deleted"
	echo
	echo
    fi
done

rm /tmp/snapshot-cleanup-existing-snapshots || true
rm /tmp/snapshot-cleanup-existing-images || true