make-snapshots-public.py

import boto.ec2
import os

env = os.environ
aws_access_key_id = os.environ.get('AWS_ACCESS_KEY')
aws_secret_access_key = os.environ.get('AWS_SECRET_ACCESS_KEY')


REGIONS = (
    'us-east-1',
    'us-west-2',
    'us-west-1',
    'eu-west-1',
    'eu-central-1',
    'ap-south-1',
    'ap-southeast-1',
    'ap-northeast-1',
    'ap-northeast-2',
    'ap-southeast-2',
    'sa-east-1',
)

failed = set()

for region in REGIONS:
    conn = boto.ec2.connect_to_region(
        region,
        aws_access_key_id=aws_access_key_id,
        aws_secret_access_key=aws_secret_access_key)

    snapshots = conn.get_all_snapshots(owner='self')

    for snapshot in snapshots:
        snap_id = snapshot.id
        conn.modify_snapshot_attribute(
            snap_id,
            operation="add",  attribute='createVolumePermission',
            groups=["all"]
        )

failed = set()

What is this used for?