Multi-platform image code is broken

[apostasie]

Description

I was banging my head on the desk chasing #3513 and friends - but eventually, trying something simple on a fresh install:

# Use whatever platform is not your native platform
nerdctl pull --platform linux/amd64  debian
nerdctl tag debian foo
nerdctl push foo

This fails on 1.7.6 (and main, obviously)

FATA[0000] failed to create a tmp single-platform image "docker.io/library/foo:latest-tmp-reduced-platform": content digest sha256:4466c6813e1d9a85fbac707afe419e13ce9a823f7041316bab860d8c0a50f91d: not found

This seems to be pervasive across the codebase (and certainly part of the problem we have been chasing with the many incarnations of content digest not found).

I am wondering if the multi-platform image concept/code overall is considered experimental at this point - or if there are known gotchas?

Steps to reproduce the issue

na

Describe the results you received and expected

na

What version of nerdctl are you using?

main

Are you using a variant of nerdctl? (e.g., Rancher Desktop)

None

Host information

No response

[apostasie]

Actually, in light of #3512 - looks like most image operations are just broken (including just images --filter) when manipulating multi-platform images.

:(

[apostasie]

@AkihiroSuda is there a document somewhere that lays-out the UX for images command when an image is not the native arch? or when it is a multi-platform image?

[apostasie]

The specific repro from this ticket has been fixed by the recent series of content digest not found PRs.

There are still issues with multi-platform code, but we should close this and possibly open new ones with appropriate repros.