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69 lines
3.9 KiB
Markdown
69 lines
3.9 KiB
Markdown
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# OCI Image Media Types
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The following media types identify the formats described here and their referenced resources:
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- `application/vnd.oci.descriptor.v1+json`: [Content Descriptor](descriptor.md)
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- `application/vnd.oci.layout.header.v1+json`: [OCI Layout](image-layout.md#oci-layout-file)
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- `application/vnd.oci.image.index.v1+json`: [Image Index](image-index.md)
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- `application/vnd.oci.image.manifest.v1+json`: [Image manifest](manifest.md#image-manifest)
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- `application/vnd.oci.image.config.v1+json`: [Image config](config.md)
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- `application/vnd.oci.image.layer.v1.tar`: ["Layer", as a tar archive](layer.md)
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- `application/vnd.oci.image.layer.v1.tar+gzip`: ["Layer", as a tar archive](layer.md#gzip-media-types) compressed with [gzip][rfc1952]
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- `application/vnd.oci.image.layer.nondistributable.v1.tar`: ["Layer", as a tar archive with distribution restrictions](layer.md#non-distributable-layers)
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- `application/vnd.oci.image.layer.nondistributable.v1.tar+gzip`: ["Layer", as a tar archive with distribution restrictions](layer.md#gzip-media-types) compressed with [gzip][rfc1952]
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## Media Type Conflicts
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[Blob](image-layout.md) retrieval methods MAY return media type metadata.
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For example, a HTTP response might return a manifest with the Content-Type header set to `application/vnd.oci.image.manifest.v1+json`.
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Implementations MAY also have expectations for the blob's media type and digest (e.g. from a [descriptor](descriptor.md) referencing the blob).
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* Implementations that do not have an expected media type for the blob SHOULD respect the returned media type.
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* Implementations that have an expected media type which matches the returned media type SHOULD respect the matched media type.
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* Implementations that have an expected media type which does not match the returned media type SHOULD:
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* Respect the expected media type if the blob matches the expected digest.
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Implementations MAY warn about the media type mismatch.
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* Return an error if the blob does not match the expected digest (as [recommended for descriptors](descriptor.md#properties)).
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* Return an error if they do not have an expected digest.
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## Compatibility Matrix
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The OCI Image Specification strives to be backwards and forwards compatible when possible.
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Breaking compatibility with existing systems creates a burden on users whether they are build systems, distribution systems, container engines, etc.
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This section shows where the OCI Image Specification is compatible with formats external to the OCI Image and different versions of this specification.
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### application/vnd.oci.image.index.v1+json
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**Similar/related schema**
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- [application/vnd.docker.distribution.manifest.list.v2+json](https://github.com/docker/distribution/blob/master/docs/spec/manifest-v2-2.md#manifest-list) - mediaType is different
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### application/vnd.oci.image.manifest.v1+json
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**Similar/related schema**
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- [application/vnd.docker.distribution.manifest.v2+json](https://github.com/docker/distribution/blob/master/docs/spec/manifest-v2-2.md#image-manifest-field-descriptions)
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### application/vnd.oci.image.layer.v1.tar+gzip
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**Interchangeable and fully compatible mime-types**
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- [application/vnd.docker.image.rootfs.diff.tar.gzip](https://github.com/docker/docker/blob/master/image/spec/v1.md#creating-an-image-filesystem-changeset)
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### application/vnd.oci.image.config.v1+json
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**Similar/related schema**
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- [application/vnd.docker.container.image.v1+json](https://github.com/docker/docker/blob/master/image/spec/v1.md#image-json-description)
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## Relations
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The following figure shows how the above media types reference each other:
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![](img/media-types.png)
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[Descriptors](descriptor.md) are used for all references.
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The image-index being a "fat manifest" references a list of image manifests per target platform. An image manifest references exactly one target configuration and possibly many layers.
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[rfc1952]: https://tools.ietf.org/html/rfc1952
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