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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,
  part_size = targets::tar_option_get("resources")$aws$part_size,
  endpoint = targets::tar_option_get("resources")$aws$endpoint,



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 the target return values are stored. Defaults to targets::tar_path_objects_dir_cloud().


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


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).


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". 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.


Named arguments to functions in paws::s3() to manage S3 storage. The documentation of these specific functions is linked from The configurable functions themselves are:

  • paws::s3()$head_object()

  • paws::s3()$get_object()

  • paws::s3()$delete_object()

  • paws::s3()$put_object()

  • paws::s3()$create_multipart_upload()

  • paws::s3()$abort_multipart_upload()

  • paws::s3()$complete_multipart_upload()

  • paws::s3()$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):
  format = "qs",
  repository = "aws",
  resources = tar_resources(
    aws = tar_resources_aws(bucket = "yourbucketname"),
    qs = tar_resources_qs(preset = "fast")
#> <tar_stem> 
#>   name: name 
#>   command:
#>     command() 
#>   format: qs 
#>   repository: aws 
#>   iteration method: vector 
#>   error mode: stop 
#>   memory mode: persistent 
#>   storage mode: main 
#>   retrieval mode: main 
#>   deployment mode: worker 
#>   priority: 0 
#>   resources:
#>     aws: <environment>
#>     qs: <environment> 
#>   cue:
#>     mode: thorough
#>     command: TRUE
#>     depend: TRUE
#>     format: TRUE
#>     repository: TRUE
#>     iteration: TRUE
#>     file: TRUE
#>     seed: TRUE 
#>   packages:
#>     targets
#>     stats
#>     graphics
#>     grDevices
#>     utils
#>     datasets
#>     methods
#>     base 
#>   library:
#>     NULL