#!/usr/bin/env python

# Script to delete tagged EBS volumes
# License GPLv3 http://www.gnu.org/licenses/quick-guide-gplv3.en.html 

import boto3
import argparse
import botocore  

def main():
    parser = argparse.ArgumentParser(description="Script to delete EBS volume - based on tag it has")
    parser.add_argument("--tagname", help="tagname which is used by EBS volume", required=True)

    args = parser.parse_args()
    tagname = args.tagname

    ec2 = boto3.resource("ec2")
    def delete_ebs():
        global tagname
        tagname = args.tagname
        while True:
            try:
                volumestag = ec2.volumes.filter(Filters=[{'Name' : 'tag-value', 'Values':[tagname]}])
                # for keys it would be ec2.volumes.filter(Filters=[{'Name' : 'tag-key', 'Values':[tagkey]}])
                for volume in volumestag:
                    print ("Deleting volume:", volume.id)
                    volume.delete(DryRun=False)
            except botocore.exceptions.ClientError as err:
                print("An exception occured", err.response["Error"]["Code"])
                continue 
            else:
                print ("Volume deleted:")
    delete_ebs()


if __name__ == '__main__':
    main()