Fix S3 ACL for public reads after `s3 sync s3://src s3://dst`

fix_acl.py

#!/usr/bin/env python
from __future__ import print_function
import boto3
import sys

s3 = boto3.resource('s3')

try:
    bucket = s3.Bucket(sys.argv[1])
except IndexError:
    print("ERROR: No bucket name provided")
    sys.exit(1)

for o in bucket.objects.all():
    try:
        print(o.key)
    except Exception:
        print("non-ascii key")
    o.Acl().put(
        ACL='public-read',
    )