Comment 2 for bug 1535900

This is a little weird, because a tarball is usually thought of as a container of stuff. Could you explain why you want 'tar' as a 'disk_format' ? It does make sense because a 'container' in the Glance sense is package containing an image and also some metadata about the image. I mean, if you don't include any such metadata in the tarball, then I guess these new Ironic images would appropriately be disk_format == tar, container_format == bare. It sounds from the Ironic spec that the contents of the tarball will be raw partitions that Ironic will write directly onto the system disk? So maybe it's more appropriate to have disk_format == raw, container_format == tar?