Cannot check image by name using ctr. #5334

dmitry-irtegov · 2021-04-11T15:43:07Z

dmitry-irtegov
Apr 11, 2021

I want to check the presence of a specific image using ctr. When I run ctr image check w/o filter, it shows the image. But when I try to filter this image by the name, ctr does not find it. There seem to be no clean documentation how to filter images by name.

fat@blackcat:~/work$ sudo ctr image check 
REF                                TYPE                                                 DIGEST                                                                  STATUS         SIZE            UNPACKED 
docker.io/kublr/alpine-plus:latest application/vnd.docker.distribution.manifest.v2+json sha256:711f7eb1f008cf74ccc1efab8c3e1e6c1cfe2e2d3f02859f329291d5d1399b2c complete (3/3) 4.1 MiB/4.1 MiB true
fat@blackcat:~/work/$ sudo ctr image check 'image==docker.io/kublr/alpine-plus:latest'
REF TYPE DIGEST STATUS SIZE UNPACKED 
fat@blackcat:~/work/$ sudo ctr image check 'image.image==docker.io/kublr/alpine-plus:latest'
REF TYPE DIGEST STATUS SIZE UNPACKED 
fat@blackcat:~/work/$ sudo ctr image check 'docker.io/kublr/alpine-plus:latest'
ctr: failed listing images: filters: parse error: [docker.io >|/|< kublr/alpine-plus:latest]: expected an operator ("=="|"!="|"~="): invalid argument: invalid argument
fat@blackcat:~/work/$ sudo ctr version
Client:
  Version:  1.3.3-0ubuntu2.3
  Revision: 

Server:
  Version:  1.3.3-0ubuntu2.3
  Revision:

ctr image ls behavior is similar.

Answered by estesp

Apr 12, 2021

Looks like we may not have a good place where the filters are documented. This code shows the supported filters for image operations:

containerd/metadata/adaptors.go

Line 30 in 7e3fd8d

func adaptImage(o interface{}) filters.Adaptor {

In short, it supports name, target, labels, and annotations; so for your use case, name is the missing link:

$ sudo ctr images ls name==docker.io/library/alpine:latest
REF                             TYPE                                                      DIGEST                                                                  SIZE    PLATFORMS                                                                                LABELS
docker.io/l…

View full answer

estesp · 2021-04-12T13:40:20Z

estesp
Apr 12, 2021
Maintainer

Looks like we may not have a good place where the filters are documented. This code shows the supported filters for image operations:

containerd/metadata/adaptors.go

Line 30 in 7e3fd8d

func adaptImage(o interface{}) filters.Adaptor {

In short, it supports name, target, labels, and annotations; so for your use case, name is the missing link:

$ sudo ctr images ls name==docker.io/library/alpine:latest
REF                             TYPE                                                      DIGEST                                                                  SIZE    PLATFORMS                                                                                LABELS
docker.io/library/alpine:latest application/vnd.docker.distribution.manifest.list.v2+json sha256:ec14c7992a97fc11425907e908340c6c3d6ff602f5f13d899e6b7027c9b4133a 2.7 MiB linux/386,linux/amd64,linux/arm/v6,linux/arm/v7,linux/arm64/v8,linux/ppc64le,linux/s390x -

2 replies

dmitry-irtegov Apr 12, 2021
Author

Thanks, it worked, both in ls and check subcommands.

dmitry-irtegov Apr 12, 2021
Author

I got to the idea of using image as a filter because I've found ImageFilters struct with json mapping to 'image'. I thought it is what is used in the filter.

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estesp Apr 12, 2021 Maintainer

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dmitry-irtegov
Apr 11, 2021

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estesp
Apr 12, 2021
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