https://github.com/tonistiigi/docker/tree/containerd-integration-wip

out.log

root@dev3:/tmp/foo#
root@dev3:/tmp/foo# docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
root@dev3:/tmp/foo# docker build --platform=linux/amd64,linux/arm64 -t foo .
[+] Building 5.8s (12/12) FINISHED
 => [internal] load build definition from Dockerfile                                                                          0.1s
 => => transferring dockerfile: 90B                                                                                           0.0s
 => [internal] load .dockerignore                                                                                             0.1s
 => => transferring context: 2B                                                                                               0.0s
 => [linux/arm64 internal] load metadata for docker.io/library/alpine:latest                                                  1.8s
 => [linux/amd64 internal] load metadata for docker.io/library/alpine:latest                                                  1.8s
 => [linux/arm64 1/3] FROM docker.io/library/alpine@sha256:c19173c5ada610a5989151111163d28a67368362762534d8a8121ce95cf2bd5a   1.6s
 => => resolve docker.io/library/alpine@sha256:c19173c5ada610a5989151111163d28a67368362762534d8a8121ce95cf2bd5a               0.1s
 => => sha256:c19173c5ada610a5989151111163d28a67368362762534d8a8121ce95cf2bd5a 1.64kB / 1.64kB                                0.0s
 => => sha256:1827be57ca85c28287d18349bbfdb3870419692656cb67c4cd0f5042f0f63aec 528B / 528B                                    0.0s
 => => sha256:61ebf0b9b18f3d296e53e536deec7714410b7ea47e4d0ae3c121b221d8ae8129 1.51kB / 1.51kB                                0.0s
 => => sha256:8bfa913040406727f36faa9b69d0b96e071b13792a83ad69c19389031a9f3797 2.72MB / 2.72MB                                0.3s
 => => extracting sha256:8bfa913040406727f36faa9b69d0b96e071b13792a83ad69c19389031a9f3797                                     0.8s
 => [internal] load build context                                                                                             0.1s
 => => transferring context: 90B                                                                                              0.0s
 => [linux/amd64 1/3] FROM docker.io/library/alpine@sha256:c19173c5ada610a5989151111163d28a67368362762534d8a8121ce95cf2bd5a   1.6s
 => => resolve docker.io/library/alpine@sha256:c19173c5ada610a5989151111163d28a67368362762534d8a8121ce95cf2bd5a               0.1s
 => => sha256:c19173c5ada610a5989151111163d28a67368362762534d8a8121ce95cf2bd5a 1.64kB / 1.64kB                                0.0s
 => => sha256:e4355b66995c96b4b468159fc5c7e3540fcef961189ca13fee877798649f531a 528B / 528B                                    0.0s
 => => sha256:965ea09ff2ebd2b9eeec88cd822ce156f6674c7e99be082c7efac3c62f3ff652 1.51kB / 1.51kB                                0.0s
 => => sha256:89d9c30c1d48bac627e5c6cb0d1ed1eec28e7dbdfbcc04712e4c79c0f83faf17 2.79MB / 2.79MB                                0.4s
 => => extracting sha256:89d9c30c1d48bac627e5c6cb0d1ed1eec28e7dbdfbcc04712e4c79c0f83faf17                                     0.8s
 => [linux/arm64 2/3] RUN uname -a > /myname                                                                                  1.4s
 => [linux/amd64 2/3] RUN uname -a > /myname                                                                                  1.3s
 => [linux/amd64 3/3] COPY Dockerfile /                                                                                       0.2s
 => [linux/arm64 3/3] COPY Dockerfile /                                                                                       0.2s
 => exporting to image                                                                                                        0.5s
 => => exporting layers                                                                                                       0.3s
 => => exporting manifest sha256:6742b1006d8156877d4ae784d2f6eed1865a6f216b3ceca8c7ba6efaf1c572a3                             0.0s
 => => exporting config sha256:a28ec7424660e6271b23b6ca0fc0624109ee8b34b15bbae5c78d1ed36ea90286                               0.0s
 => => exporting manifest sha256:6c5bfe8e600431f3bc85601aa4056081a68bf0abff0a442e659a87f8a087e975                             0.0s
 => => exporting config sha256:b82b9bd4e314a99b3c6759a914e3d43114e4cca4c8380dbc92f00e83a2bc1d47                               0.0s
 => => exporting manifest list sha256:376aa2cb10a4901448afa9054b45e58e0e13a69f524dbc0bd0db2788a99ce33c                        0.0s
 => => naming to docker.io/library/foo:latest                                                                                 0.0s
root@dev3:/tmp/foo# docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
foo                 latest              376aa2cb10a4        4 seconds ago       0B
root@dev3:/tmp/foo# docker run -it foo uname -a
Linux dabbb155a6c7 4.19.0-0.bpo.1-amd64 #1 SMP Debian 4.19.12-1~bpo9+1 (2018-12-30) x86_64 Linux
root@dev3:/tmp/foo# docker run -it --platform=linux/arm64 foo uname -a
Linux 80cd7b6732be 4.19.0-0.bpo.1-amd64 #1 SMP Debian 4.19.12-1~bpo9+1 (2018-12-30) aarch64 Linux
root@dev3:/tmp/foo#
root@dev3:/tmp/foo# docker run -it --platform=linux/arm64 foo cat /myname
Linux buildkitsandbox 4.19.0-0.bpo.1-amd64 #1 SMP Debian 4.19.12-1~bpo9+1 (2018-12-30) aarch64 Linux
root@dev3:/tmp/foo# docker run -it --platform=linux/amd64 foo cat /myname
Linux buildkitsandbox 4.19.0-0.bpo.1-amd64 #1 SMP Debian 4.19.12-1~bpo9+1 (2018-12-30) x86_64 Linux
root@dev3:/tmp/foo#
root@dev3:/tmp/foo# docker build --platform=linux/amd64,linux/arm64 -t tonistiigi/foo -o type=oci,dest=- . | tar xv
[+] Building 1.3s (12/12) FINISHED
 => [internal] load build definition from Dockerfile                                                                          0.0s
 => => transferring dockerfile: 31B                                                                                           0.0s
 => [internal] load .dockerignore                                                                                             0.1s
 => => transferring context: 2B                                                                                               0.0s
 => [linux/arm64 internal] load metadata for docker.io/library/alpine:latest                                                  0.3s
 => [linux/amd64 internal] load metadata for docker.io/library/alpine:latest                                                  0.3s
 => [linux/arm64 1/3] FROM docker.io/library/alpine@sha256:c19173c5ada610a5989151111163d28a67368362762534d8a8121ce95cf2bd5a   0.0s
 => [internal] load build context                                                                                             0.0s
 => => transferring context: 31B                                                                                              0.0s
 => [linux/amd64 1/3] FROM docker.io/library/alpine@sha256:c19173c5ada610a5989151111163d28a67368362762534d8a8121ce95cf2bd5a   0.0s
 => CACHED [linux/amd64 2/3] RUN uname -a > /myname                                                                           0.0s
 => CACHED [linux/amd64 3/3] COPY Dockerfile /                                                                                0.0s
 => CACHED [linux/arm64 2/3] RUN uname -a > /myname                                                                           0.0s
 => CACHED [linux/arm64 3/3] COPY Dockerfile /                                                                                0.0s
 => exporting to oci image format                                                                                             0.9s
 => => exporting layers                                                                                                       0.0s
 => => exporting manifest sha256:d73aa995103541d1d334d8db9e56e18fd1c2b123750bdb73bdb68c034a3a23a2                             0.0s
 => => exporting config sha256:a28ec7424660e6271b23b6ca0fc0624109ee8b34b15bbae5c78d1ed36ea90286                               0.0s
 => => exporting manifest sha256:279ace68032a2d2dd3f5e1a4a3e554f0cbfff6bab6f96d9b025afafaeb8c5cad                             0.0s
 => => exporting config sha256:b82b9bd4e314a99b3c6759a914e3d43114e4cca4c8380dbc92f00e83a2bc1d47                               0.0s
 => => exporting manifest list sha256:207ee34bf379e2db0c912beb79372ca9ff548ff051b43892bc7043a09ed2d00d                        0.0s
 => => sending tarball                                                                                                        0.7s
root@dev3:/tmp/foo# cat index.json | jq .
{
  "schemaVersion": 2,
  "manifests": [
    {
      "mediaType": "application/vnd.oci.image.index.v1+json",
      "digest": "sha256:207ee34bf379e2db0c912beb79372ca9ff548ff051b43892bc7043a09ed2d00d",
      "size": 703,
      "annotations": {
        "io.containerd.image.name": "docker.io/tonistiigi/foo:latest",
        "org.opencontainers.image.created": "2019-11-07T01:15:01Z",
        "org.opencontainers.image.ref.name": "latest"
      }
    }
  ]
}
root@dev3:/tmp/foo# cat blobs/sha256/207ee34bf379e2db0c912beb79372ca9ff548ff051b43892bc7043a09ed2d00d
{
   "mediaType": "application/vnd.oci.image.index.v1+json",
   "schemaVersion": 2,
   "manifests": [
      {
         "mediaType": "application/vnd.oci.image.manifest.v1+json",
         "digest": "sha256:d73aa995103541d1d334d8db9e56e18fd1c2b123750bdb73bdb68c034a3a23a2",
         "size": 908,
         "platform": {
            "architecture": "amd64",
            "os": "linux"
         }
      },
      {
         "mediaType": "application/vnd.oci.image.manifest.v1+json",
         "digest": "sha256:279ace68032a2d2dd3f5e1a4a3e554f0cbfff6bab6f96d9b025afafaeb8c5cad",
         "size": 908,
         "platform": {
            "architecture": "arm64",
            "os": "linux"
         }
      }
   ]
}