Add an owner to a bucket

Add owner access control to a Cloud Storage bucket.

Documentation pages that include this code sample

To view the code sample used in context, see the following documentation:

Code sample


For more information, see the Cloud Storage C# API reference documentation.

using Google.Apis.Storage.v1.Data;
using Google.Cloud.Storage.V1;
using System;
using System.Collections.Generic;

public class AddBucketOwnerSample
    public Bucket AddBucketOwner(
        string bucketName = "your-unique-bucket-name",
        string userEmail = "")
        var storage = StorageClient.Create();
        var bucket = storage.GetBucket(bucketName, new GetBucketOptions { Projection = Projection.Full });

        bucket.Acl ??= new List<BucketAccessControl>();

        bucket.Acl.Add(new BucketAccessControl
            Bucket = bucketName,
            Entity = $"user-{userEmail}",
            Role = "OWNER",
        var updatedBucket = storage.UpdateBucket(bucket);
        Console.WriteLine($"Added user { userEmail } as an owner on bucket { bucketName }.");
        return updatedBucket;


For more information, see the Cloud Storage C++ API reference documentation.

namespace gcs = google::cloud::storage;
using ::google::cloud::StatusOr;
[](gcs::Client client, std::string const& bucket_name,
   std::string const& entity) {
  StatusOr<gcs::BucketAccessControl> patched_acl =
      client.PatchBucketAcl(bucket_name, entity,

  if (!patched_acl) throw std::runtime_error(patched_acl.status().message());
  std::cout << "ACL entry for " << patched_acl->entity() << " in bucket "
            << patched_acl->bucket() << " is now " << *patched_acl << "\n";


For more information, see the Cloud Storage Go API reference documentation.

import (


// addBucketOwner adds ACL to the specified bucket.
func addBucketOwner(bucket string, entity storage.ACLEntity) error {
	// bucket := "bucket-name"
	// entity := storage.AllUsers
	role := storage.RoleOwner

	ctx := context.Background()
	client, err := storage.NewClient(ctx)
	if err != nil {
		return fmt.Errorf("storage.NewClient: %v", err)
	defer client.Close()

	acl := client.Bucket(bucket).ACL()
	if err := acl.Set(ctx, entity, role); err != nil {
		return fmt.Errorf("ACLHandle.Set: %v", err)
	return nil


For more information, see the Cloud Storage Node.js API reference documentation.

 * TODO(developer): Uncomment the following lines before running the sample.
// The ID of your GCS bucket
// const bucketName = 'your-unique-bucket-name';

// The email address of the user to add
// const userEmail = 'user-email-to-add';

// Imports the Google Cloud client library
const {Storage} = require('@google-cloud/storage');

// Creates a client
const storage = new Storage();

async function addBucketOwner() {
  // Makes the user an owner of the bucket. You can use addAllUsers(),
  // addDomain(), addProject(), addGroup(), and addAllAuthenticatedUsers()
  // to grant access to different types of entities. You can also use "readers"
  // and "writers" to grant different roles.
  await storage.bucket(bucketName).acl.owners.addUser(userEmail);

  console.log(`Added user ${userEmail} as an owner on bucket ${bucketName}.`);



For more information, see the Cloud Storage PHP API reference documentation.

use Google\Cloud\Storage\StorageClient;

 * Add an entity and role to a bucket's ACL.
 * @param string $bucketName the name of your Cloud Storage bucket.
 * @param string $entity The entity to update access controls for.
 * @param string $role The permissions to add for the specified entity. May
 *        be one of 'OWNER', 'READER', or 'WRITER'.
 * @param array $options
 * @return void
function add_bucket_acl($bucketName, $entity, $role, $options = [])
    $storage = new StorageClient();
    $bucket = $storage->bucket($bucketName);
    $acl = $bucket->acl();
    $acl->add($entity, $role, $options);
    printf('Added %s (%s) to gs://%s ACL' . PHP_EOL, $entity, $role, $bucketName);


For more information, see the Cloud Storage Python API reference documentation.

from import storage

def add_bucket_owner(bucket_name, user_email):
    """Adds a user as an owner on the given bucket."""
    # bucket_name = "your-bucket-name"
    # user_email = ""

    storage_client = storage.Client()

    bucket = storage_client.bucket(bucket_name)

    # Reload fetches the current ACL from Cloud Storage.

    # You can also use `group()`, `domain()`, `all_authenticated()` and `all()`
    # to grant access to different types of entities.
    # You can also use `grant_read()` or `grant_write()` to grant different
    # roles.

        "Added user {} as an owner on bucket {}.".format(
            user_email, bucket_name

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