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Create the aws argument of tar_resources() to specify optional settings to AWS for tar_target(..., repository = "aws"). See the format argument of tar_target() for details.


  bucket = targets::tar_option_get("resources")$aws$bucket,
  prefix = targets::tar_option_get("resources")$aws$prefix,
  region = targets::tar_option_get("resources")$aws$region,
  endpoint = targets::tar_option_get("resources")$aws$endpoint,
  s3_force_path_style = targets::tar_option_get("resources")$aws$s3_force_path_style,
  part_size = targets::tar_option_get("resources")$aws$part_size,
  page_size = targets::tar_option_get("resources")$aws$page_size,
  max_tries = targets::tar_option_get("resources")$aws$max_tries,
  seconds_timeout = targets::tar_option_get("resources")$aws$seconds_timeout,
  close_connection = targets::tar_option_get("resources")$aws$close_connection,
  verbose = targets::tar_option_get("resources")$aws$verbose,



Character of length 1, name of an existing bucket to upload and download the return values of the affected targets during the pipeline.


Character of length 1, "directory path" in the bucket where your target object and metadata will go. Please supply an explicit prefix unique to your targets project. In the future, targets will begin requiring explicitly user-supplied prefixes. (This last note was added on 2023-08-24: targets version


Character of length 1, AWS region containing the S3 bucket. Set to NULL to use the default region.


Character of length 1, URL endpoint for S3 storage. Defaults to the Amazon AWS endpoint if NULL. Example: To use the S3 protocol with Google Cloud Storage, set endpoint = "" and region = "auto". (A custom endpoint may require that you explicitly set a custom region directly in tar_resources_aws(). region = "auto" happens to work with Google Cloud.) Also make sure to create HMAC access keys in the Google Cloud Storage console (under Settings => Interoperability) and set the AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY environment variables accordingly. After that, you should be able to use S3 storage formats with Google Cloud storage buckets. There is one limitation, however: even if your bucket has object versioning turned on, targets may fail to record object versions. Google Cloud Storage in particular has this incompatibility.


Logical of length 1, whether to use path-style addressing for S3 requests.


Positive numeric of length 1, number of bytes for each part of a multipart upload. (Except the last part, which is the remainder.) In a multipart upload, each part must be at least 5 MB. The default value of the part_size argument is 5 * (2 ^ 20).


Positive integer of length 1, number of items in each page for paginated HTTP requests such as listing objects.


Positive integer of length 1, maximum number of attempts to access a network resource on AWS.


Positive numeric of length 1, number of seconds until an HTTP connection times out.


Logical of length 1, whether to close HTTP connections immediately.


Logical of length 1, whether to print console messages when running computationally expensive operations such as listing objects in a large bucket.


Named arguments to functions in to manage S3 storage. The documentation of these specific functions is linked from The configurable functions themselves are:








  •$upload_part() The named arguments in ... must not be any of "bucket", "Bucket", "key", "Key", "prefix", "region", "part_size", "endpoint", "version", "VersionId", "body", "Body", "metadata", "Metadata", "UploadId", "MultipartUpload", or "PartNumber".


Object of class "tar_resources_aws", to be supplied to the aws argument of tar_resources().


See the cloud storage section of for details for instructions.


Functions tar_target() and tar_option_set() each takes an optional resources argument to supply non-default settings of various optional backends for data storage and high-performance computing. The tar_resources() function is a helper to supply those settings in the correct manner.

In targets version 0.12.2 and above, resources are inherited one-by-one in nested fashion from tar_option_get("resources"). For example, suppose you set tar_option_set(resources = tar_resources(aws = my_aws)), where my_aws equals tar_resources_aws(bucket = "x", prefix = "y"). Then, tar_target(data, get_data() will have bucket "x" and prefix "y". In addition, if new_resources equals tar_resources(aws = tar_resources_aws(bucket = "z"))), then tar_target(data, get_data(), resources = new_resources) will use the new bucket "z", but it will still use the prefix "y" supplied through tar_option_set(). (In targets 0.12.1 and below, options like prefix do not carry over from tar_option_set() if you supply non-default resources to tar_target().)


# Somewhere in you target script file (usually _targets.R):
if (identical(Sys.getenv("TAR_EXAMPLES"), "true")) { # for CRAN
  format = "qs",
  repository = "aws",
  resources = tar_resources(
    aws = tar_resources_aws(bucket = "yourbucketname"),
    qs = tar_resources_qs(preset = "fast")