Layer download status

[allada]

I have been poking around looking to see if there's an easy way to check if the entire image has been downloaded or not (ie: layer status) and have only found how to check inside a container, but not outside the container.

I see the comment here: #716 (comment)

What I'm looking for is a faster way to just have a simple check to see if the entire layer is ready. Spinning up a container is a lot slower than what I'm looking for. I'm trying to make the check be as quick as possible, because I'd like to re-schedule some tasks if I get a miss when specific flags are set in my request (it's a remote-execution management system).

Great work btw!

[allada]

I do see I can use:

ctr-remote --namespace=namespace_here i check name~=\"name_here\"

But it'd be nice to get it in a json format (or something more machine-friendly).

[ktock]

@allada Maybe you can use prometheus endpoint: #288