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Add support for erofs and squashfs layer media types #1191

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Add support for erofs and squashfs layer media types #1191

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2 changes: 2 additions & 0 deletions config.md
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Expand Up @@ -30,6 +30,8 @@ Layers SHOULD be packed and unpacked reproducibly to avoid changing the layer Di

NOTE: Do not confuse DiffIDs with [layer digests](manifest.md#image-manifest-property-descriptions), often referenced in the manifest, which are digests over compressed or uncompressed content.

For erofs and squashfs layers, a layer DiffID is the digest over the layer itself.

### Layer ChainID

For convenience, it is sometimes useful to refer to a stack of layers with a single identifier.
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4 changes: 4 additions & 0 deletions layer.md
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Expand Up @@ -20,6 +20,8 @@ This section defines the `application/vnd.oci.image.layer.v1.tar`, `application/

- Layer Changesets for the [media type](media-types.md) `application/vnd.oci.image.layer.v1.tar` MUST be packaged in [tar archive][tar-archive].
- Layer Changesets for the [media type](media-types.md) `application/vnd.oci.image.layer.v1.tar` MUST NOT include duplicate entries for file paths in the resulting [tar archive][tar-archive].
- Layer Changesets for the [media type](media-types.md) `application/vnd.oci.image.layer.v1.erofs` MUST be packaged in [erofs file][erofs].
- Layer Changesets for the [media type](media-types.md) `application/vnd.oci.image.layer.v1.squashfs` MUST be packaged in [squashfs file][squashfs].

## Change Types

Expand Down Expand Up @@ -365,3 +367,5 @@ Implementations SHOULD NOT upload layers tagged with this media type; however, s
[rfc1952_2]: https://tools.ietf.org/html/rfc1952
[tar-archive]: https://en.wikipedia.org/wiki/Tar_(computing)
[rfc8478]: https://tools.ietf.org/html/rfc8478
[squashfs]: https://github.com/plougher/squashfs-tools
[erofs]: https://erofs.docs.kernel.org/
8 changes: 8 additions & 0 deletions specs-go/v1/mediatype.go
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Expand Up @@ -45,6 +45,14 @@ const (
// MediaTypeImageLayerZstd is the media type used for zstd compressed
// layers referenced by the manifest.
MediaTypeImageLayerZstd = "application/vnd.oci.image.layer.v1.tar+zstd"

// MediaTypeErofs specifies the media type as erofs filesystem layer
// https://www.iana.org/assignments/media-types/application/vnd.erofs
MediaTypeErofs = "application/vnd.oci.image.layer.v1.erofs"

// MediaTypeSquashfs specifies the media type as squashfs filesystem layer
// https://github.com/plougher/squashfs-tools
MediaTypeSquashfs = "application/vnd.oci.image.layer.v1.squashfs"
)

// Non-distributable layer media-types.
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