nerdctl shows RepoDigest as Image ID unlike Docker

[knqyf263]

Looks like nerdctl shows RepoDigest in Image ID. As you know, RepoDigest is a digest of the manifest.

$ nerdctl images
REPOSITORY    TAG     IMAGE ID        CREATED          PLATFORM          SIZE       BLOB SIZE
alpine        3.15    4edbd2beb5f7    6 minutes ago    linux/amd64       5.9 MiB    2.7 MiB
alpine        3.15    4edbd2beb5f7    6 minutes ago    linux/arm/v6      0.0 B      2.5 MiB
alpine        3.15    4edbd2beb5f7    6 minutes ago    linux/arm/v7      0.0 B      2.3 MiB
alpine        3.15    4edbd2beb5f7    6 minutes ago    linux/arm64/v8    0.0 B      2.6 MiB
alpine        3.15    4edbd2beb5f7    6 minutes ago    linux/386         0.0 B      2.7 MiB
alpine        3.15    4edbd2beb5f7    6 minutes ago    linux/ppc64le     0.0 B      2.7 MiB
alpine        3.15    4edbd2beb5f7    6 minutes ago    linux/s390x       0.0 B      2.5 MiB
$ nerdctl inspect alpine:3.15 | jq -r '.[0].RepoDigests[0]'
alpine@sha256:4edbd2beb5f78b1014028f4fbb99f3237d9561100b6881aabbf5acce2c4f9454
$ nerdctl inspect alpine:3.15 | jq -r '.[0].Id'
sha256:0ac33e5f5afa79e084075e8698a22d574816eea8d7b7d480586835657c3e1c8b

On the other hand, Docker uses a digest of the config for Image ID.

$ docker images alpine:3.15
REPOSITORY   TAG       IMAGE ID       CREATED        SIZE
alpine       3.15      0ac33e5f5afa   2 months ago   5.57MB
$ docker inspect alpine:3.15 | jq -r '.[0].RepoDigests[0]'
alpine@sha256:4edbd2beb5f78b1014028f4fbb99f3237d9561100b6881aabbf5acce2c4f9454
$ docker inspect alpine:3.15 | jq -r '.[0].Id'
sha256:0ac33e5f5afa79e084075e8698a22d574816eea8d7b7d480586835657c3e1c8b

Is this difference intended?

Ref. https://github.com/opencontainers/image-spec/blob/main/config.md#imageid

[AkihiroSuda]

Yes
f9eb1e5

[knqyf263]

Oh, I'm so sorry I missed those warnings... I assumed that the default behavior was the same as Docker. Thanks for confirming.