Delete EBS snapshots that are not attached to any AMI and are at least 90 days old

delete-snapshots.py

#!/usr/bin/python
## The script deletes the snapshots that are :
## - not attached to an AMI
## - are atleast 90 days old 

## Output : 
## - soem csv files if a report is required
## - the return values ( return_code  && request_id from the delete command )

## Usage
## ./delete-snapshots.py <ami-tag-name> <ami-tag-value>


import boto3
import csv
import sys
import os
import shutil
import pytz
from datetime import datetime, timedelta
from pprint import pprint
account_id = boto3.client('sts').get_caller_identity()['Account']
oldest_date = datetime.now(pytz.utc) - timedelta(days=90)
tag_value = sys.argv[1]
#shutil.rmtree(account_id)
if not os.path.exists(account_id):
    os.makedirs(account_id)
map_file = account_id+'/map_file'
ami_snapshots = account_id+'/ami_snapshots'
all_snapshots = account_id+'/all_snapshots'
client = boto3.client('ec2')
csvdata = []
ami_snaps = []
response = client.describe_images(Owners=[account_id])
for i in response['Images']:
  curr_data = [i['ImageId']]
  for j in i['BlockDeviceMappings']:
    if 'Ebs' in j:
      snapshots = []
      curr_data.append(j['Ebs']['SnapshotId'])
      snapshots.append(j['Ebs']['SnapshotId'])
      ami_snaps.append(snapshots)
  csvdata.append(curr_data)
with open(map_file,'w') as csvFile:
  writer = csv.writer(csvFile)
  writer.writerows(csvdata)
csvFile.close()
with open(ami_snapshots,'w') as csvFile:
  writer = csv.writer(csvFile)
  writer.writerows(ami_snaps)
csvFile.close()
## Get All Snaphots
response = client.describe_snapshots(OwnerIds=[account_id])
snap_list = []
for i in response['Snapshots']:
  snapshot_id = i['SnapshotId']
  temp_arr = [snapshot_id]
  if temp_arr not in ami_snaps:
    snap_list.append(temp_arr)
with open(all_snapshots,'w') as csvFile:
  writer = csv.writer(csvFile)
  writer.writerows(snap_list)
csvFile.close()
old_snapshot = []
for s in snap_list:
  print "===================================================="
  snapshot = client.describe_snapshots(OwnerIds=[account_id],SnapshotIds=[s[0]],Filters=[{'Name':'tag:'+sys.argv[1],'Values':[sys.argv[2]]}])
  #pprint(snapshot)
  if snapshot['Snapshots'] == []:
    #pprint(s[0]+" does not have the tag key")
    continue
  if snapshot['Snapshots'][0]['StartTime'] < oldest_date:
    pprint(s[0] + " to be DELETED !!")
    #pprint(s[0])
    response = client.delete_snapshot(SnapshotId=s[0])
    pprint(response['ResponseMetadata']['HTTPStatusCode'])
    pprint(response['ResponseMetadata']['RequestId'])