[pull] main from containerd:main#241
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pull[bot] merged 2 commits intomeonBot:mainfrom Feb 16, 2026
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If docker in the host is configured to use the containerd image format,
then the docker pull/save commands above download the multi-platform
image. IOW, the index.json has references to the other platforms SHAs.
This references to things that are not present (the artifacts for other
platforms) is what make `ctr` fail. However, if we specify a platform,
then ctr ignores the other platforms and the import works just fine.
To try this locally, you can:
$ docker pull ghcr.io/containerd/busybox:1.36
$ docker save ghcr.io/containerd/busybox:1.36 -o image.tar
$ ctr images import --local=true image.tar
The last command will fail if you are using the containerd image store
in docker. If you specify the platform with --platform, it works fine.
With docker overlayfs2 storage driver, if you untar the image you get only
things relevant for your platform:
```
$ cat index.json | jq
{
"schemaVersion": 2,
"mediaType": "application/vnd.oci.image.index.v1+json",
"manifests": [
{
"mediaType": "application/vnd.oci.image.manifest.v1+json",
"digest": "sha256:4d6b13f2ddbe87da8d9dee3719df1723a6d768e511802e70d42ab15370c6eb24",
"size": 401,
"annotations": {
"io.containerd.image.name": "ghcr.io/containerd/busybox:1.36",
"org.opencontainers.image.ref.name": "1.36"
}
}
]
}
$ cat blobs/sha256/4d6b13f2ddbe87da8d9dee3719df1723a6d768e511802e70d42ab15370c6eb24 | jq
{
"schemaVersion": 2,
"mediaType": "application/vnd.oci.image.manifest.v1+json",
"config": {
"mediaType": "application/vnd.oci.image.config.v1+json",
"digest": "sha256:66ba00ad3de8677a3fa4bc4ea0fc46ebca0f14db46ca365e7f60833068dd0148",
"size": 1457
},
"layers": [
{
"mediaType": "application/vnd.oci.image.layer.v1.tar",
"digest": "sha256:b64792c17e4ad443d16b218afb3a8f5d03ca0f4ec49b11c1a7aebe17f6c3c1d2",
"size": 5096448
}
]
}
```
But with the other you get for lot of other platforms too:
```
$ cat index.json | jq
{
"schemaVersion": 2,
"mediaType": "application/vnd.oci.image.index.v1+json",
"manifests": [
{
"mediaType": "application/vnd.docker.distribution.manifest.list.v2+json",
"digest": "sha256:7b3ccabffc97de872a30dfd234fd972a66d247c8cfc69b0550f276481852627c",
"size": 2295,
"annotations": {
"containerd.io/distribution.source.ghcr.io": "containerd/busybox",
"io.containerd.image.name": "ghcr.io/containerd/busybox:1.36",
"org.opencontainers.image.ref.name": "1.36"
}
}
]
}
$ cat blobs/sha256/7b3ccabffc97de872a30dfd234fd972a66d247c8cfc69b0550f276481852627c | jq
{
"manifests": [
{
"digest": "sha256:907ca53d7e2947e849b839b1cd258c98fd3916c60f2e6e70c30edbf741ab6754",
"mediaType": "application/vnd.docker.distribution.manifest.v2+json",
"platform": {
"architecture": "amd64",
"os": "linux"
},
"size": 528
},
{
"digest": "sha256:dde8e930c7b6a490f728e66292bc9bce42efc9bbb5278bae40e4f30f6e00fe8c",
"mediaType": "application/vnd.docker.distribution.manifest.v2+json",
"platform": {
"architecture": "arm",
"os": "linux",
"variant": "v5"
},
"size": 528
},
{
...
```
You can switch to the containerd snapshotter in docker by adding this to the daemon.json:
```
{
"features": {
"containerd-snapshotter": true
}
}
```
Signed-off-by: Rodrigo Campos <rodrigo@amutable.com>
integration: Fix TestImageLoad() failure on CI
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