protocol: { "driver": "file", "filename": "/var/lib/libvirt/images/i.qcow2", "size": 4294967296 } format: { "driver": "qcow2", "file": "0123456789ABCDEF0123456789ABCDE", "size": 8589934590, "backing-file": "json:{\"driver\":\"raw\",\"offset\":9876,\"size\":54321,\"file\":{\"driver\":\"file\",\"filename\":\"/var/lib/libvirt/images/i.img\"}}", "backing-fmt": "raw" }