Comment 12 for bug 1415087

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Daniel Berrange (berrange) wrote : Re: Format-guessing and file disclosure in image convert

FYI If cinder (or any part of Nova/Glance/etc) ever creates qcow2 files with backing files, it must also make sure to use the '-obacking_fmt=FORMATNAME' option when creating them, to stop QEMU probiing formats when opening backing files.