AWS List of snapshots without AMI (Boto3)

aws_orphan_snapshots.py

import boto3
from boto3 import ec2
import datetime
import re
from datetime import date


def is_attached(image, snapshot):
    for mapping in image['BlockDeviceMappings']:
        # Is it a machine ephemeral device?
        if "VirtualName" in mapping:
            if 'ephemeral' in mapping['VirtualName']:
                return False
        if mapping['Ebs']['SnapshotId'] == snapshot['SnapshotId']:
            return True
    return False

def info_orphan_snapshots(region_name, accountID, vdryRun=False):
    filters = [
        {
            'Name': 'owner-id',
            'Values': [
                accountID,
            ]
        }
    ]
    session = boto3.Session(region_name=region_name)
    client = session.client("ec2", region_name)
    snapshots = client.describe_snapshots(Filters=filters)["Snapshots"]
    snapshots_ids = [ snapshot['SnapshotId'] for snapshot in snapshots ]
    images = client.describe_images(Filters=filters)["Images"]

    snapshots_attached = [ snapshot for snapshot in snapshots for image in images if is_attached(image, snapshot)  ]
    snapshots_attached_ids = [ item['SnapshotId'] for item in snapshots_attached ]

    print("Snapthots count:", len(snapshots))
    print("Images count:", len(images))
    print("Images attached:", len(snapshots_attached))

    snapshots_dettached_ids = list(set(snapshots_ids) - set(snapshots_attached_ids))
    snapshots_dettached = [ snapshot for snapshot in snapshots for snapshot_dettached_id in snapshots_dettached_ids if snapshot_dettached_id == snapshot['SnapshotId'] ]

    print("Images dettached: ", len(snapshots_dettached))
    for item in snapshots_dettached:
        print(">", item['SnapshotId'], item['VolumeSize'])