Support OCI index images (such as produced by buildkit cache exports) #227

tkarls · 2022-01-19T16:46:48Z

I have configured a buildkit daemon to use our private docker registry as a cache registry. The pushed cache images does not appear corrent in the GUI. See screenshot.

I have used curl to try and list the maifest and then I got the following response
"OCI index found, but accept header does not support OCI indexes"

This error comes from here:
https://github.com/distribution/distribution/blob/5f1974ab8b537b5bbce467971b05ee62c441fd7a/registry/handlers/manifests.go#L174

From this page:
https://github.com/opencontainers/image-spec/blob/main/media-types.md#oci-image-media-types

I concluded that I must use "application/vnd.oci.image.index.v1+json" in the Accept header.
With this value appended to the curl command I was able to list the image and also use the 'Docker-Content-Digest' response header to delete the image using curl.

It would be great if that header can be added to this UI to support these image types as well.

Joxit · 2022-02-05T10:38:23Z

Hello, thank you for using my project 😄

Hum, interesting, so I should add this header here

docker-registry-ui/src/scripts/docker-image.js

Lines 132 to 136 in db6b74a

    
           oReq.setRequestHeader( 
        
             'Accept', 
        
             'application/vnd.docker.distribution.manifest.v2+json, application/vnd.oci.image.manifest.v1+json' + 
        
               (self.opts.list ? ', application/vnd.docker.distribution.manifest.list.v2+json' : '') 
        
           );

tkarls · 2022-02-07T09:03:43Z

Yes I belive so.

The manigests are a bit different, but just for extracting the sha from the header to support delete should work the same I think.

quertenmont · 2022-03-01T15:15:56Z

I am also looking forward to have support for cache manifest (view and delete)
Thanks in advance!

Joxit · 2022-03-13T09:04:37Z

Hi there,

I tried Buildkit with Docker Registry UI. It seems like you are using this kind of command with buildkit:

buildctl build --frontend=dockerfile.v0 --local context=. --local dockerfile=. --export-cache type=registry,ref=localhost:5000/buildkit:latest

The use of export-cache with type registry produces images which are incompatible with the docker registry server Manifest API.
This forces me to use the media type application/vnd.oci.image.index.v1+json that produce a json without the image digest that is required to get the blob sha and history of the image.

You can compare with application/vnd.docker.distribution.manifest.v2+json where the image digest is available in config.digest. Even the OCI Image Manifest is compatible with the UI.

How to fix your issue ? I suggest you to use the option --output with the push option instead that create the perfect output for docker registries.

buildctl build --frontend=dockerfile.v0        --local dockerfile=. --output type=image,name=localhost:5000/buildkit:latest,push=true

Is this possible for you or do you have any limitations that prevent you from using --output?

tkarls · 2022-03-14T11:27:08Z

Those are two different things.

I'm using the --output as well as for the actual image that I use for creating containers when running the apps. The --export-cache is for the build cache which I need exported to have a cluster of build agents reuse the build cache. The inline build bache option does not include the cache for all intermediate build stages in a multi stage build as far as I can tell. So thats why we're using the separe cache image.

Not sure what you mean with the images being incompatible with the docker registry. The registry backend seems to handle them just fine and buildkit can pull the cache down again when building.

Joxit · 2022-03-16T22:25:54Z

Not sure what you mean with the images being incompatible with the docker registry. The registry backend seems to handle them just fine and buildkit can pull the cache down again when building.

In the UI, in order to retrieve all information for a image I need two endpoints from the Docker Registry API.
The first one is from the docker server Manifest API.

GET /v2/<image name>/manifests/<tag name>

Accept: application/vnd.docker.distribution.manifest.v2+json, application/vnd.oci.image.manifest.v1+json

As you can see, I already accept manifest schema from docker application/vnd.docker.distribution.manifest.v2+json AND OCI images application/vnd.oci.image.manifest.v1+json. This endpoint will produce the JSON below

Click to expand Manifest Result

{
   "mediaType": "application/vnd.docker.distribution.manifest.v2+json",
   "schemaVersion": 2,
   "config": {
      "mediaType": "application/vnd.docker.container.image.v1+json",
      "digest": "sha256:4e459fee8dd03c413580dfc6e9caf6f5d294dc1d1cd857a183b696daff15e81c",
      "size": 10038
   },
   "layers": [
      {
         "mediaType": "application/vnd.docker.image.rootfs.diff.tar.gzip",
         "digest": "sha256:59bf1c3509f33515622619af21ed55bbe26d24913cedbca106468a5fb37a50c3",
         "size": 2818413
      },
      {
         "mediaType": "application/vnd.docker.image.rootfs.diff.tar.gzip",
         "digest": "sha256:8d6ba530f6489d12676d7f61628427d067243ba4a3a512c3e28813b977cb3b0e",
         "size": 7341319
      },
      {
         "mediaType": "application/vnd.docker.image.rootfs.diff.tar.gzip",
         "digest": "sha256:5288d7ad7a7f84bdd19c1e8f0abb8684b5338f3da86fe9ae1d7f0e9bc2de6595",
         "size": 601
      },
      {
         "mediaType": "application/vnd.docker.image.rootfs.diff.tar.gzip",
         "digest": "sha256:39e51c61c033442d00c40a30b2a9ed01f40205875fbd8664c50b4dc3e99ad5cf",
         "size": 894
      },
      {
         "mediaType": "application/vnd.docker.image.rootfs.diff.tar.gzip",
         "digest": "sha256:ee6f71c6f4a82b2afd01f92bdf6be0079364d03020e8a2c569062e1c06d3822b",
         "size": 665
      },
      {
         "mediaType": "application/vnd.docker.image.rootfs.diff.tar.gzip",
         "digest": "sha256:f2303c6c88653b9a6739d50f611c170b9d97d161c6432409c680f6b46a5f112f",
         "size": 1390
      },
      {
         "mediaType": "application/vnd.docker.image.rootfs.diff.tar.gzip",
         "digest": "sha256:4f4fb700ef54461cfa02571ae0db9a0dc1e0cdb5577484a6d75e68dc38e8acc1",
         "size": 32
      },
      {
         "mediaType": "application/vnd.docker.image.rootfs.diff.tar.gzip",
         "digest": "sha256:30ad6d18caaa2d3ca5af9e5426c56d0cf65c16f89944c7722da7e7373a9577a3",
         "size": 975
      },
      {
         "mediaType": "application/vnd.docker.image.rootfs.diff.tar.gzip",
         "digest": "sha256:890316ae144ef726d6ddfa31eb691f01aaec354aa8f4f74a0350e8189f8da8dc",
         "size": 843
      },
      {
         "mediaType": "application/vnd.docker.image.rootfs.diff.tar.gzip",
         "digest": "sha256:e02b12b1d987d9b8755c313e846d29866f62185b88f2cab907517531581b6b84",
         "size": 874351
      },
      {
         "mediaType": "application/vnd.docker.image.rootfs.diff.tar.gzip",
         "digest": "sha256:829b142c0a44d7553c30f1fdb476c074be70181e441e909de0a3f9497ffdbb57",
         "size": 18338
      },
      {
         "mediaType": "application/vnd.docker.image.rootfs.diff.tar.gzip",
         "digest": "sha256:9bf51e297d370f9436b6866ea120a1e4bd2962786017edb5875315eaa4066d97",
         "size": 896185
      }
   ]
}

From this JSON I will sum layers[*].size to get the image size, then I take the config.digest and use the Blob API

GET /v2/<image name>/blobs/<config.digest string>

Accept: application/vnd.docker.distribution.manifest.v2+json, application/vnd.oci.image.manifest.v1+json

This blob contains important metadata such as creation date for the tag list page and all the information to create the history page (Labels, Environments, Exposed Port, Image Stages....). Without this object, my UI can't work properly. You can see a response example below.

Click to expand Blob Result

{
  "architecture": "amd64",
  "config": {
    "ExposedPorts": {
      "80/tcp": {}
    },
    "Env": [
      "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
      "NGINX_VERSION=1.21.6",
      "NJS_VERSION=0.7.2",
      "PKG_RELEASE=1",
      "NGINX_PROXY_HEADER_Host=$http_host",
      "NGINX_LISTEN_PORT=80"
    ],
    "Entrypoint": [
      "/docker-entrypoint.sh"
    ],
    "Cmd": [
      "nginx",
      "-g",
      "daemon off;"
    ],
    "WorkingDir": "/usr/share/nginx/html/",
    "Labels": {
      "maintainer": "Jones MAGLOIRE @Joxit"
    },
    "StopSignal": "SIGQUIT",
    "OnBuild": null
  },
  "created": "2022-03-13T08:13:28.458764628+01:00",
  "history": [
    {
      "created": "2021-11-24T20:19:40.199700946Z",
      "created_by": "/bin/sh -c #(nop) ADD file:9233f6f2237d79659a9521f7e390df217cec49f1a8aa3a12147bbca1956acdb9 in / "
    },
    {
      "created": "2021-11-24T20:19:40.483367546Z",
      "created_by": "/bin/sh -c #(nop)  CMD [\"/bin/sh\"]",
      "empty_layer": true
    },
    {
      "created": "2021-12-29T19:29:04.16538557Z",
      "created_by": "/bin/sh -c #(nop)  LABEL maintainer=NGINX Docker Maintainers <[email protected]>",
      "empty_layer": true
    },
    {
      "created": "2022-01-25T20:38:57.564847523Z",
      "created_by": "/bin/sh -c #(nop)  ENV NGINX_VERSION=1.21.6",
      "empty_layer": true
    },
    {
      "created": "2022-01-25T20:38:57.780944464Z",
      "created_by": "/bin/sh -c #(nop)  ENV NJS_VERSION=0.7.2",
      "empty_layer": true
    },
    {
      "created": "2022-01-25T20:38:58.001318895Z",
      "created_by": "/bin/sh -c #(nop)  ENV PKG_RELEASE=1",
      "empty_layer": true
    },
    {
      "created": "2022-01-25T20:39:07.536319062Z",
      "created_by": "/bin/sh -c set -x  ...."
    },
    {
      "created": "2022-01-25T20:39:08.151512909Z",
      "created_by": "/bin/sh -c #(nop) COPY file:65504f71f5855ca017fb64d502ce873a31b2e0decd75297a8fb0a287f97acf92 in / "
    },
    {
      "created": "2022-01-25T20:39:08.618949282Z",
      "created_by": "/bin/sh -c #(nop) COPY file:0b866ff3fc1ef5b03c4e6c8c513ae014f691fb05d530257dfffd07035c1b75da in /docker-entrypoint.d "
    },
    {
      "created": "2022-01-25T20:39:09.304128562Z",
      "created_by": "/bin/sh -c #(nop) COPY file:0fd5fca330dcd6a7de297435e32af634f29f7132ed0550d342cad9fd20158258 in /docker-entrypoint.d "
    },
    {
      "created": "2022-01-25T20:39:09.813218835Z",
      "created_by": "/bin/sh -c #(nop) COPY file:09a214a3e07c919af2fb2d7c749ccbc446b8c10eb217366e5a65640ee9edcc25 in /docker-entrypoint.d "
    },
    {
      "created": "2022-01-25T20:39:10.15290576Z",
      "created_by": "/bin/sh -c #(nop)  ENTRYPOINT [\"/docker-entrypoint.sh\"]",
      "empty_layer": true
    },
    {
      "created": "2022-01-25T20:39:10.498199739Z",
      "created_by": "/bin/sh -c #(nop)  EXPOSE 80",
      "empty_layer": true
    },
    {
      "created": "2022-01-25T20:39:10.860347544Z",
      "created_by": "/bin/sh -c #(nop)  STOPSIGNAL SIGQUIT",
      "empty_layer": true
    },
    {
      "created": "2022-01-25T20:39:11.21594189Z",
      "created_by": "/bin/sh -c #(nop)  CMD [\"nginx\" \"-g\" \"daemon off;\"]",
      "empty_layer": true
    },
    {
      "created": "2022-03-13T08:13:28.237041716+01:00",
      "created_by": "LABEL maintainer=Jones MAGLOIRE @Joxit",
      "comment": "buildkit.dockerfile.v0",
      "empty_layer": true
    },
    {
      "created": "2022-03-13T08:13:28.237041716+01:00",
      "created_by": "WORKDIR /usr/share/nginx/html/",
      "comment": "buildkit.dockerfile.v0"
    },
    {
      "created": "2022-03-13T08:13:28.237041716+01:00",
      "created_by": "ENV NGINX_PROXY_HEADER_Host=$http_host",
      "comment": "buildkit.dockerfile.v0",
      "empty_layer": true
    },
    {
      "created": "2022-03-13T08:13:28.237041716+01:00",
      "created_by": "ENV NGINX_LISTEN_PORT=80",
      "comment": "buildkit.dockerfile.v0",
      "empty_layer": true
    },
    {
      "created": "2022-03-13T08:13:28.292012782+01:00",
      "created_by": "COPY nginx/default.conf /etc/nginx/conf.d/default.conf # buildkit",
      "comment": "buildkit.dockerfile.v0"
    },
    {
      "created": "2022-03-13T08:13:28.309117311+01:00",
      "created_by": "COPY bin/entrypoint /docker-entrypoint.d/90-docker-registry-ui.sh # buildkit",
      "comment": "buildkit.dockerfile.v0"
    },
    {
      "created": "2022-03-13T08:13:28.336973324+01:00",
      "created_by": "COPY dist/ /usr/share/nginx/html/ # buildkit",
      "comment": "buildkit.dockerfile.v0"
    },
    {
      "created": "2022-03-13T08:13:28.35325107+01:00",
      "created_by": "COPY favicon.ico /usr/share/nginx/html/ # buildkit",
      "comment": "buildkit.dockerfile.v0"
    },
    {
      "created": "2022-03-13T08:13:28.458764628+01:00",
      "created_by": "RUN /bin/sh -c chown -R nginx:nginx /etc/nginx/ /usr/share/nginx/html/ /var/cache/nginx # buildkit",
      "comment": "buildkit.dockerfile.v0"
    }
  ],
  "moby.buildkit.buildinfo.v1": "eyJmcm9udGVuZCI6ImRvY2tlcmZpbGUudjAiLCJzb3VyY2VzIjpbeyJ0eXBlIjoiZG9ja2VyLWltYWdlIiwicmVmIjoiZG9ja2VyLmlvL2xpYnJhcnkvbmdpbng6YWxwaW5lIiwicGluIjoic2hhMjU2OmRhOWM5NGJlYzFkYTgyOWViZDUyNDMxYTg0NTAyZWM0NzFjOGU1NDhmZmIyY2VkYmYzNjI2MGZkOWJkMWQ0ZDMifV19",
  "os": "linux",
  "rootfs": {
    "type": "layers",
    "diff_ids": [
      "sha256:8d3ac3489996423f53d6087c81180006263b79f206d3fdec9e66f0e27ceb8759",
      "sha256:67bae81de3dc5ccf5101dd4973e8e4b10ee3d5681feb9c30119e6acee1e12dd5",
      "sha256:89f4d03665cee1ca943d0b55c086ea7577f4658c2cabe69eaf640f1dc47129f9",
      "sha256:318191938fd7801d80ad617482e4312f0ced71e6c1d4bcb02e12d90a9d65eb11",
      "sha256:a770f8eba3cb3840d7579e2c4925c9fa275813e8719fe5435905b887a9ee7674",
      "sha256:6fda88393b8b02872c87c6626807e7bfac1f49e63f47a5ddba0cd11fae99b575",
      "sha256:5f70bf18a086007016e948b04aed3b82103a36bea41755b6cddfaf10ace3c6ef",
      "sha256:16eb951e9ea9c0ab11e5af087c762528f85e6b216a7c56ef003805439ea5f90f",
      "sha256:1a1db89726971b65895b495442ed10b5df0d4c7e90cbb943d28b4fce770257cb",
      "sha256:5c8eff90fb43c7dbe872fdf130dc51ab8828cd9d461af9944c3ad8ba4286301a",
      "sha256:18749a2b685b525bef320c94d198d7b40fc83a08bc1d951cc1e3d3b121e2ff92",
      "sha256:254c4dc7aefcff4cca8b682e73b9297707f6d8874626a167a5cb8ac23149d12e"
    ]
  }
}

Now, when I add the application/vnd.oci.image.index.v1+json schema in the Accept header, it will produce a different JSON.

GET /v2/<image name>/manifests/<tag name>

Accept: application/vnd.docker.distribution.manifest.v2+json, application/vnd.oci.image.manifest.v1+json, application/vnd.oci.image.index.v1+json

This new JSON do not have the config.digest key.... The only thing I can do with this JSON is calculate the image size and nothing else.... Yes this work when you push or pull an image because it contains all the information to create an image, but for advanced display like docker registry ui it is not enough.

Click to expand OCI Index Result

{
  "schemaVersion": 2,
  "mediaType": "application/vnd.oci.image.index.v1+json",
  "manifests": [
    {
      "mediaType": "application/vnd.oci.image.layer.v1.tar+gzip",
      "digest": "sha256:30ad6d18caaa2d3ca5af9e5426c56d0cf65c16f89944c7722da7e7373a9577a3",
      "size": 975,
      "annotations": {
        "buildkit/createdat": "2022-03-13T08:13:28.292012782+01:00",
        "containerd.io/uncompressed": "sha256:16eb951e9ea9c0ab11e5af087c762528f85e6b216a7c56ef003805439ea5f90f"
      }
    },
    {
      "mediaType": "application/vnd.oci.image.layer.v1.tar+gzip",
      "digest": "sha256:39e51c61c033442d00c40a30b2a9ed01f40205875fbd8664c50b4dc3e99ad5cf",
      "size": 894,
      "annotations": {
        "buildkit/createdat": "2022-03-13T08:13:25.930661922+01:00",
        "containerd.io/uncompressed": "sha256:318191938fd7801d80ad617482e4312f0ced71e6c1d4bcb02e12d90a9d65eb11"
      }
    },
    {
      "mediaType": "application/vnd.oci.image.layer.v1.tar+gzip",
      "digest": "sha256:4f4fb700ef54461cfa02571ae0db9a0dc1e0cdb5577484a6d75e68dc38e8acc1",
      "size": 32,
      "annotations": {
        "buildkit/createdat": "2022-03-13T08:13:28.237041716+01:00",
        "containerd.io/uncompressed": "sha256:5f70bf18a086007016e948b04aed3b82103a36bea41755b6cddfaf10ace3c6ef"
      }
    },
    {
      "mediaType": "application/vnd.oci.image.layer.v1.tar+gzip",
      "digest": "sha256:5288d7ad7a7f84bdd19c1e8f0abb8684b5338f3da86fe9ae1d7f0e9bc2de6595",
      "size": 601,
      "annotations": {
        "buildkit/createdat": "2022-03-13T08:13:25.922233753+01:00",
        "containerd.io/uncompressed": "sha256:89f4d03665cee1ca943d0b55c086ea7577f4658c2cabe69eaf640f1dc47129f9"
      }
    },
    {
      "mediaType": "application/vnd.oci.image.layer.v1.tar+gzip",
      "digest": "sha256:59bf1c3509f33515622619af21ed55bbe26d24913cedbca106468a5fb37a50c3",
      "size": 2818413,
      "annotations": {
        "buildkit/createdat": "2022-03-13T08:13:25.907648369+01:00",
        "containerd.io/uncompressed": "sha256:8d3ac3489996423f53d6087c81180006263b79f206d3fdec9e66f0e27ceb8759"
      }
    },
    {
      "mediaType": "application/vnd.oci.image.layer.v1.tar+gzip",
      "digest": "sha256:829b142c0a44d7553c30f1fdb476c074be70181e441e909de0a3f9497ffdbb57",
      "size": 18338,
      "annotations": {
        "buildkit/createdat": "2022-03-13T08:13:28.35325107+01:00",
        "containerd.io/uncompressed": "sha256:18749a2b685b525bef320c94d198d7b40fc83a08bc1d951cc1e3d3b121e2ff92"
      }
    },
    {
      "mediaType": "application/vnd.oci.image.layer.v1.tar+gzip",
      "digest": "sha256:890316ae144ef726d6ddfa31eb691f01aaec354aa8f4f74a0350e8189f8da8dc",
      "size": 843,
      "annotations": {
        "buildkit/createdat": "2022-03-13T08:13:28.309117311+01:00",
        "containerd.io/uncompressed": "sha256:1a1db89726971b65895b495442ed10b5df0d4c7e90cbb943d28b4fce770257cb"
      }
    },
    {
      "mediaType": "application/vnd.oci.image.layer.v1.tar+gzip",
      "digest": "sha256:8d6ba530f6489d12676d7f61628427d067243ba4a3a512c3e28813b977cb3b0e",
      "size": 7341319,
      "annotations": {
        "buildkit/createdat": "2022-03-13T08:13:25.913689097+01:00",
        "containerd.io/uncompressed": "sha256:67bae81de3dc5ccf5101dd4973e8e4b10ee3d5681feb9c30119e6acee1e12dd5"
      }
    },
    {
      "mediaType": "application/vnd.oci.image.layer.v1.tar+gzip",
      "digest": "sha256:9bf51e297d370f9436b6866ea120a1e4bd2962786017edb5875315eaa4066d97",
      "size": 896185,
      "annotations": {
        "buildkit/createdat": "2022-03-13T08:13:28.458764628+01:00",
        "containerd.io/uncompressed": "sha256:254c4dc7aefcff4cca8b682e73b9297707f6d8874626a167a5cb8ac23149d12e"
      }
    },
    {
      "mediaType": "application/vnd.oci.image.layer.v1.tar+gzip",
      "digest": "sha256:e02b12b1d987d9b8755c313e846d29866f62185b88f2cab907517531581b6b84",
      "size": 874351,
      "annotations": {
        "buildkit/createdat": "2022-03-13T08:13:28.336973324+01:00",
        "containerd.io/uncompressed": "sha256:5c8eff90fb43c7dbe872fdf130dc51ab8828cd9d461af9944c3ad8ba4286301a"
      }
    },
    {
      "mediaType": "application/vnd.oci.image.layer.v1.tar+gzip",
      "digest": "sha256:ee6f71c6f4a82b2afd01f92bdf6be0079364d03020e8a2c569062e1c06d3822b",
      "size": 665,
      "annotations": {
        "buildkit/createdat": "2022-03-13T08:13:25.938244858+01:00",
        "containerd.io/uncompressed": "sha256:a770f8eba3cb3840d7579e2c4925c9fa275813e8719fe5435905b887a9ee7674"
      }
    },
    {
      "mediaType": "application/vnd.oci.image.layer.v1.tar+gzip",
      "digest": "sha256:f2303c6c88653b9a6739d50f611c170b9d97d161c6432409c680f6b46a5f112f",
      "size": 1390,
      "annotations": {
        "buildkit/createdat": "2022-03-13T08:13:25.946044285+01:00",
        "containerd.io/uncompressed": "sha256:6fda88393b8b02872c87c6626807e7bfac1f49e63f47a5ddba0cd11fae99b575"
      }
    },
    {
      "mediaType": "application/vnd.buildkit.cacheconfig.v0",
      "digest": "sha256:6482ebe3fa00365be4c1b86a89c6620624e5a6af53dc8aa845237f3f23143e4a",
      "size": 2809
    }
  ]
}

It totally makes sense because the export-cache, as its name suggest, will export only the cache/layers of the image as a TAR file (=> Without metadata).

FYI, manifests[*].digest contains image layers in tar.gz

So if you think having the interface without a creation date or history for this kind of images is fine with you, I can do it anyway. Otherwise, I would say that it is simply not compatible with my project.

tkarls · 2022-03-17T09:54:52Z

Thanks for the detailed investigation!

I think I understand now, and as you say most of the data under the history view does not apply to this kind of "image".
For me personally I would be more than happy if the UI would just be able to list them without errors and perhaps support the delete button. The history view and creation dates are not important, this type of data is temporary in its nature anyway.

If that could be supported then that would be great! :)

Joxit · 2022-03-17T10:47:12Z

Fair enough, I will add the support then 😄

Joxit · 2022-03-20T17:41:46Z

Hi there, this will be available in the next release and is already available with the main tag.
You can subscribe to be notified of the next release

Joxit added the bug label Feb 5, 2022

Joxit closed this as completed in 05cbb51 Mar 20, 2022

Joxit added this to the 2.2.0 milestone Mar 21, 2022

This was referenced May 16, 2023

Multiarch image creation date and history #308

Closed

Buildx multiarch image date and history not shown #309

Closed

Joxit added this to docker-registry-ui Sep 27, 2023

Joxit moved this to Done in docker-registry-ui Sep 27, 2023

Bvngee mentioned this issue Nov 9, 2024

Multi-arch manifest list not rendering properly #401

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Support OCI index images (such as produced by buildkit cache exports) #227

Support OCI index images (such as produced by buildkit cache exports) #227

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Support OCI index images (such as produced by buildkit cache exports) #227

Support OCI index images (such as produced by buildkit cache exports) #227

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