Multi-platform images do not show

[mattsimonsen]

Hello,

I noticed an error with multi-platform images (at least in my configuration w/ Ubuntu 18.04 out of the box install).

When mirroring https://quay.io/repository/prometheus/alertmanager the images sync perfectly, until image v0.17.0, where the images seem to download. But upon re-run, the images never get to "PRESENT" but remain in "CHANGED" state each run.

To reproduce:

lstags -v quay.io/prometheus/alertmanager:v0.18.0

CHANGED sha256:3c0f0ea52a662342282fc7236ce058ab4 ce3c87f17369 2019-07-08T08:07:19-07:00 quay.io/prometheus/alertmanager:v0.18.0

This above command never succeeds in updating v0.18.0, despite docker being tasked with a new download.

docker images --digests | grep v0.18.0

quay.io/prometheus/alertmanager v0.18.0 sha256:3d52ab7ef3a2e23e26a73cfd0ce13189e3796fb276b9af3e79664e4f743d8a1d ce3c87f17369 2 months ago 51.9MB

I believe this issue is due to Docker using the top level checksum, while lstags uses the container specific sha256. Looking at https://quay.io/repository/prometheus/alertmanager?tag=latest&tab=tags I noticed the lstags checksum matches the child manifest checksum.

Furthermore, this behavior for prometheus/alertmanager started with v0.17.0, the same time that alertmanager shows multi-platform containers added.

Thank you for any suggestions, or if I can provide more info or test, I would be happy to.

Matt

[ivanilves]

Thanks for sharing this issue.

I believe this issue is due to Docker using the top level checksum, while lstags uses the container specific sha256.

Looks like this makes a lot of sense. 👌

I will look into this ASAP.