platform/machine/qemu/cluster: stop passing backing_fmt to qemu-img
qemu-img automatically detects the format of the backing image.
@@ -295,7 +295,7 @@ func setupPrimaryDisk(imageFile string) (*os.File, error) {
return nil, err
}
- qcowOpts := fmt.Sprintf("backing_file=%s,backing_fmt=raw,lazy_refcounts=on", backingFile)
+ qcowOpts := fmt.Sprintf("backing_file=%s,lazy_refcounts=on", backingFile)
return setupDisk("-o", qcowOpts)
}
