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Here the opensuse image with tag 42.2 has been unpacked to produce a rootfs directory and config.json. As per the documentation:

SYNOPSIS

umoci unpack--image=image[:tag] [--rootless] [--uid-map=value] [--uid-map=value] [--keep-dirlinks] bundle

DESCRIPTION

Extracts all of the layers (deterministically) to an OCI runtime bundle at the path bundle, as well as generating an OCI runtime configuration that corresponds to the image's configuration. In addition, an mtree(8) specification is generated at the time of unpacking to allow filesystem deltas to be generated by umoci-repack(1) and thus allowing for the creation of layered OCI images.

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