So, basically there is no standalone tool that takes a tarball and prepares a file system image contained in it to be pushed to Docker Hub. And no “docker import” is not standalone, because it requires the whole of Docker. Dear , I want something like “img” that takes a tarball as input.

For reference: github.com/genuinetools/img

If nobody has done it before, maybe O should fork “img” and call the newfangled creature “omg”. Now that would be a cool name.

Adrián Pérez
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Also, I don't want huge monster tools like Packer or “docker-compose”, they reek of bloat. Of I need something complex to make my images, I would use Vagga for that anyway, which will happily output tarballs.

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