All tags can be found in backend/s3/providers.go Provider Struct. Looking through a few of the yaml files as examples should make things clear. AWS.yaml as the most config. pasting.

YAML

In backend/s3/provider/YourProvider.yaml

name
description
- More like the full name often "YourProvider + Object Storage"

[Region]

Any regions your provider supports or the defaults (use region: {} for this)

Example from AWS.yaml:

region:
  us-east-1: |-
    The default endpoint - a good choice if you are unsure.
    US Region, Northern Virginia, or Pacific Northwest.
    Leave location constraint empty.

The defaults (as seen in Rclone.yaml):

region:
  "": |-
    Use this if unsure.
    Will use v4 signatures and an empty region.
  other-v2-signature: |-
    Use this only if v4 signatures don't work.
    E.g. pre Jewel/v10 CEPH.

[Endpoint]

Any endpoints your provider supports

Example from Mega.yaml

  endpoint:
    s3.eu-central-1.s4.mega.io: Mega S4 eu-central-1 (Amsterdam)

[Location Constraint]

The Location Constraint of your remote, often same as region.

Example from AWS.yaml

location_constraint:
  "": Empty for US Region, Northern Virginia, or Pacific Northwest
  us-east-2: US East (Ohio) Region

[ACL]

Identical across most providers. Select the default with acl: {}

Example from AWS.yaml

acl:
  private: |-
    Owner gets FULL_CONTROL.
    No one else has access rights (default).
  public-read: |-
    Owner gets FULL_CONTROL.
    The AllUsers group gets READ access.
  public-read-write: |-
    Owner gets FULL_CONTROL.
    The AllUsers group gets READ and WRITE access.
    Granting this on a bucket is generally not recommended.
  authenticated-read: |-
    Owner gets FULL_CONTROL.
    The AuthenticatedUsers group gets READ access.
  bucket-owner-read: |-
    Object owner gets FULL_CONTROL.
    Bucket owner gets READ access.
    If you specify this canned ACL when creating a bucket, Amazon S3 ignores it.
  bucket-owner-full-control: |-
    Both the object owner and the bucket owner get FULL_CONTROL over the object.
    If you specify this canned ACL when creating a bucket, Amazon S3 ignores it.

[Storage Class]

Identical across most providers.

Defaults from AWS.yaml

storage_class:
  "": Default
  STANDARD: Standard storage class
  REDUCED_REDUNDANCY: Reduced redundancy storage class
  STANDARD_IA: Standard Infrequent Access storage class
  ONEZONE_IA: One Zone Infrequent Access storage class
  GLACIER: Glacier Flexible Retrieval storage class
  DEEP_ARCHIVE: Glacier Deep Archive storage class
  INTELLIGENT_TIERING: Intelligent-Tiering storage class
  GLACIER_IR: Glacier Instant Retrieval storage class

[Server Side Encryption]

Not common, identical across most providers.

Defaults from AWS.yaml

  server_side_encryption:
    "": None
    AES256: AES256
    aws:kms: aws:kms

[Advanced Options]

All advanced options are Boolean - if true the configurator asks about that value, if not it doesn't:

BucketACL             bool `yaml:"bucket_acl,omitempty"`
DirectoryBucket       bool `yaml:"directory_bucket,omitempty"`
LeavePartsOnError     bool `yaml:"leave_parts_on_error,omitempty"`
RequesterPays         bool `yaml:"requester_pays,omitempty"`
SSECustomerAlgorithm  bool `yaml:"sse_customer_algorithm,omitempty"`
SSECustomerKey        bool `yaml:"sse_customer_key,omitempty"`
SSECustomerKeyBase64  bool `yaml:"sse_customer_key_base64,omitempty"`
SSECustomerKeyMd5     bool `yaml:"sse_customer_key_md5,omitempty"`
SSEKmsKeyID           bool `yaml:"sse_kms_key_id,omitempty"`
STSEndpoint           bool `yaml:"sts_endpoint,omitempty"`
UseAccelerateEndpoint bool `yaml:"use_accelerate_endpoint,omitempty"`

Example from AWS.yaml:

bucket_acl: true
directory_bucket: true
leave_parts_on_error: true
requester_pays: true
sse_customer_algorithm: true
sse_customer_key: true
sse_customer_key_base64: true
sse_customer_key_md5: true
sse_kms_key_id: true
sts_endpoint: true
use_accelerate_endpoint: true

Quirks

Quirks are discovered through documentation and running the tests as seen below.

Most quirks are *bool as to have 3 values, true, false and dont care.

type Quirks struct {
    ListVersion           *int   `yaml:"list_version,omitempty"`     // 1 or 2
    ForcePathStyle        *bool  `yaml:"force_path_style,omitempty"` // true = path-style
    ListURLEncode         *bool  `yaml:"list_url_encode,omitempty"`
    UseMultipartEtag      *bool  `yaml:"use_multipart_etag,omitempty"`
    UseAlreadyExists      *bool  `yaml:"use_already_exists,omitempty"`
    UseAcceptEncodingGzip *bool  `yaml:"use_accept_encoding_gzip,omitempty"`
    MightGzip             *bool  `yaml:"might_gzip,omitempty"`
    UseMultipartUploads   *bool  `yaml:"use_multipart_uploads,omitempty"`
    UseUnsignedPayload    *bool  `yaml:"use_unsigned_payload,omitempty"`
    UseXID                *bool  `yaml:"use_x_id,omitempty"`
    SignAcceptEncoding    *bool  `yaml:"sign_accept_encoding,omitempty"`
    CopyCutoff            *int64 `yaml:"copy_cutoff,omitempty"`
    MaxUploadParts        *int   `yaml:"max_upload_parts,omitempty"`
    MinChunkSize          *int64 `yaml:"min_chunk_size,omitempty"`
}

Example from AWS.yaml

quirks:
  might_gzip: false # Never auto gzips objects
  use_unsigned_payload: false # AWS has trailer support

Note that if you omit a section, eg region then the user won't be asked that question, and if you add an empty section e.g. region: {} then the defaults from the Other.yaml will be used.

DOCS

docs/content/s3.md
- Add the provider at the top of the page.
- Add a section about the provider linked from there.
  - Make sure this is in alphabetical order in the Providers section.
- Add a transcript of a trial rclone config session
  - Edit the transcript to remove things which might change in subsequent versions
- Do not alter or add to the autogenerated parts of s3.md
  - Rule of thumb: don't edit anything not mentioned above.
- Do not run make backenddocs or bin/make_backend_docs.py s3
  - This will make autogenerated changes!
README.md - this is the home page in github
- Add the provider and a link to the section you wrote in docs/contents/s3.md
docs/content/_index.md - this is the home page of rclone.org
- Add the provider and a link to the section you wrote in docs/contents/s3.md
Once you've written the docs, run make serve and check they look OK in the web browser and the links (internal and external) all work.

TESTS

Once you've written the code, test rclone config works to your satisfaction and looks correct, and check the integration tests work go test -v -remote NewS3Provider:. You may need to adjust the quirks to get them to pass. Some providers just can't pass the tests with control characters in the names so if these fail and the provider doesn't support urlEncodeListings in the quirks then ignore them.