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Add some restriction to "org.opencontainers.ref.name" #591

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Add some restriction to "org.opencontainers.ref.name" #591

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1 change: 1 addition & 0 deletions image-layout.md
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Expand Up @@ -148,6 +148,7 @@ The [image index](image-index.md) is a multi-descriptor entry point.
This index provides an established path (`/index.json`) to have an entry point for an image-layout and to discover auxiliary descriptors.

No semantic restriction is given for the "org.opencontainers.ref.name" annotation of descriptors.
The value of "org.opencontainers.ref.name" annotation is a string which MUST NOT include characters outside of the set of "A" to "Z", "a" to "z", "0" to "9", the hyphen `-`, the dot `.`, and the underscore `_`.
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The original regexp also has some more constraints on corner-cases which are allowed by your wording:

  • empty string
  • arbitrarily-long string (> 128 chars)
  • symbol-only string (eg. ..)
  • string starting with a symbol (eg. .hidden)

In general the `mediaType` of each [descriptor][descriptors] object in the `manifests` field will be either `application/vnd.oci.image.index.v1+json` or `application/vnd.oci.image.manifest.v1+json`.
Future versions of the spec MAY use a different mediatype (i.e. a new versioned format).
An encountered `mediaType` that is unknown SHOULD be safely ignored.
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