import image which no tag will not display by ctr

[yylt]

Description
In the docker, Image has only hash value, example:

$ sudo docker images
REPOSITORY                                                        TAG                 IMAGE ID            CREATED             SIZE
<none>                                                               <none>                  6308a9db5272        5 hours ago         312MB

when use ctr to import the image, there are no any error, but 'ctr i ls` can not find this image

Steps to reproduce the issue:

1. docker save -o tmp.tar 621ba461ce0f
2. ctr i import tmp.tar
3. ctr i ls

Describe the results you received:
ctr i ls display nothing

Describe the results you expected:
should has result, like:

# ctr i ls
REF                                                                     TYPE                                                 DIGEST                                                                  SIZE      PLATFORMS   LABELS     
sha256:6308a9db5272754bf7928f2d364e89482653e4aa4a7898e76333b0b12fa2c428 application/vnd.docker.distribution.manifest.v2+json sha256:25d509ac82512d68448c4a6adcdbcf42eb6a3d3be01992af8ea5b556f8db9929 306.7 MB linux/amd64 

Output of containerd --version:

v1.3.7

Any other relevant information:

[zhangguanzhang]

use the latest is ok

[root@centos7 temp]# docker images
REPOSITORY                                 TAG                 IMAGE ID            CREATED             SIZE
alpine                                     3.11.6              f70734b6a266        3 months ago        5.61MB
[root@centos7 temp]# docker save -o tmp.tar alpine:3.11.6 
[root@centos7 temp]# ctr i ls
REF TYPE DIGEST SIZE PLATFORMS LABELS 
[root@centos7 temp]# ctr i import tmp.tar
unpacking docker.io/library/alpine:3.11.6 (sha256:d7c36d94b31ad7fe08a6505409b303a66dae8bc3c842eb8d244225ebf7133b9a)...done
[root@centos7 temp]# ctr i ls
REF                             TYPE                                       DIGEST                                                                  SIZE    PLATFORMS   LABELS 
docker.io/library/alpine:3.11.6 application/vnd.oci.image.manifest.v1+json sha256:d7c36d94b31ad7fe08a6505409b303a66dae8bc3c842eb8d244225ebf7133b9a 5.6 MiB linux/amd64 -      

[fuweid]

Hi @yylt The archive result from docker save by image ID doesn't contain any repo:tag information. containerd cann't do the assumption to use image ID as name in image service(one important component in containerd) when there is no image name/tag.

If there is requirement for this, I think containerd client API can help.

close it and please feel free to reopen it if necessary. Thanks