Looking for an image to test "chunked" image pulls

[ipilcher]

I have a question about "chunked" image pulls.

I am working on a patch that affects extraction of files during image pulls, and it seems like there are 2 code paths that I need to consider—the "normal" path that calls extractTarFileEntry() in vendor/go.podman.io/storage/pkg/archive/archive.go and the "chunked" path that calls chunkedDiffer.ApplyDiff() in vendor/go.podman.io/storage/pkg/chunked/storage_linux.go.

The challenge I'm currently facing is testing the latter ("chunked") path. I haven't been able to find an image to pull that triggers this path. Can anyone suggest an image that I can pull to test this path?

[Luap99]

@giuseppe PTAL

[ipilcher]

FWIW, I solved my problem by setting convert_images = "true" in the [storage.options.pull_options] section of my storage.conf. That triggers the "chunked" path, regardless of the image that I pull.

[giuseppe]

I play with some images here: https://quay.io/repository/giuseppe/zstd-chunked?tab=tags&tag=latest

You can easily create one though with podman push --compression-format zstd:chunked your-image