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Then, to make this nicer, it makes sense to allow deriving the URL to download the rootfs image from directly from the UEFI HTTP boot URL. Or in other words: if you point your UEFI to boot a UKI from some URL (i.e. http://example.com/somedir/myimage.efi), then that UKI's initrd is smart enough to derive from that same URL a different URL for the rootfs (by replacing the final component, so that it becomes http://example.com/somedir/myimage.raw.xz).