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Require 'subject[*].name' to be unique for links #223

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May 18, 2023
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Require 'subject[*].name' to be unique for links #223

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12 changes: 8 additions & 4 deletions spec/predicates/link.md
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Original file line number Diff line number Diff line change
Expand Up @@ -62,6 +62,9 @@ The `predicate` has the same schema as the link's `signed` field in
- `predicate.materials` is updated to a list of `ResourceDescriptors`.
Each `ResourceDescriptor` entry MUST include `name` and `digest`.

Further, each subject's `name` in a link attestation MUST be unique within the
scope of that attestation.

`name`, _string, required_

Name of the step. When used with an in-toto layout as described in the
Expand All @@ -76,9 +79,9 @@ is required, it may be empty.
`materials`, _list of [ResourceDescriptor] objects, optional_

List of artifacts that make up the materials of the step. The `name` and
`digest` fields of each entry MUST be set. [ITE-4] artifact types may be
identified using the `uri` or `mediaType` fields instead of overloading the
`name` field.
`digest` fields of each entry MUST be set, and `name` MUST be unique among the
`materials` entries. [ITE-4] artifact types may be identified using the `uri`
or `mediaType` fields instead of overloading the `name` field.

`byproducts`, _object, optional_

Expand Down Expand Up @@ -125,7 +128,8 @@ def convert(statement):

- 0.3: Updated `materials` to use a list of `ResourceDescriptor` objects.
Reverted `command` to a list of strings to match the original link
specification.
specification. Supports use of `ResourceDescriptor` for attestation
subjects and requires their `name` to be unique.
- 0.2: Removed `_type` and `products`. Defined conversion rules.
- 0.1: Initial version as described in [in-toto specification].

Expand Down