Would like a way to determine if two Platforms are compatible

[nfachan]

This is on ARM64.

I have a Platform object that I got from Platform::default().

I have a list of Descriptors that I got from the manifests() function on the index for docker://alpine.

I'm trying to find an image that I can run on the current Platform. My current code just does a strict equality check on the two Platforms. This fails because the alpine container has the "v8" variant set.

I can obviously fix this by stripping off variants, but I would like a way to do this the correct way.

One way to do this would be to have "normalize" functions, like this: https://github.com/containerd/containerd/blob/v1.4.3/platforms/database.go#L83
I could normalize both Platforms and use strict equality checking.

I think a better way would be to have a method on Platform like can_be_run_on, or can_run, that takes another Platform.

I'm happy to provide a PR, but would like some input on the preferred direction before I do so.

[utam0k]

@saschagrunert I think it's worth accepting the PR. WDYT?

[saschagrunert]

Yeah I think this makes sense 👍

[nfachan]

Okay. I which of the two options do you prefer?

impl Platform {
    fn normalize(Self) -> Self { ... }

    fn can_run(&self, other: &Self) -> bool { ... }
}

[utam0k]

I prefer can_run().