How to change permission recursively to folder with AWS s3 or AWS s3api

use python to set up the permissions recursively

#!/usr/bin/env python
import boto3
import sys

client = boto3.client('s3')
BUCKET='enter-bucket-name'

def process_s3_objects(prefix):
    """Get a list of all keys in an S3 bucket."""
    kwargs = {'Bucket': BUCKET, 'Prefix': prefix}
    failures = []
    while_true = True
    while while_true:
      resp = client.list_objects_v2(**kwargs)
      for obj in resp['Contents']:
        try:
            print(obj['Key'])
            set_acl(obj['Key'])
            kwargs['ContinuationToken'] = resp['NextContinuationToken']
        except KeyError:
            while_true = False
        except Exception:
            failures.append(obj["Key"])
            continue

    print "failures :", failures

def set_acl(key):
  client.put_object_acl(     
    GrantFullControl="id=%s" % get_account_canonical_id,
    Bucket=BUCKET,
    Key=key
)

def get_account_canonical_id():
  return client.list_buckets()["Owner"]["ID"]


process_s3_objects(sys.argv[1])

You will need to run the command individually for every object.

You might be able to short-cut the process by using:

aws s3 cp --acl bucket-owner-full-control --metadata Key=Value --profile <original_account_profile> s3://bucket/path s3://bucket/path

That is, you copy the files to themselves, but with the added ACL that grants permissions to the bucket owner.

If you have sub-directories, then add --recursive.

This can be only be achieved with using pipes. Try -

aws s3 ls s3://bucket/path/ --recursive | awk '{cmd="aws s3api put-object-acl --acl bucket-owner-full-control --bucket bucket --key "$4; system(cmd)}'

The other answers are ok, but the FASTEST way to do this is to use the aws s3 cp command with the option --metadata-directive REPLACE, like this:

aws s3 cp --recursive --acl bucket-owner-full-control s3://bucket/folder s3://bucket/folder --metadata-directive REPLACE

This gives speeds of between 50Mib/s and 80Mib/s.

The answer from the comments from John R, which suggested to use a 'dummy' option, like --storage-class STANDARD. Whilst this works, only gave me copy speeds between 5Mib/s and 11mb/s.

The inspiration for trying this came from AWS's support article on the subject: https://aws.amazon.com/premiumsupport/knowledge-center/s3-object-change-anonymous-ownership/

NOTE: If you encounter 'access denied` for some of your objects, this is likely because you are using AWS creds for the bucket owning account, whereas you need to use creds for the account where the files were copied from.