Github user kiwiflyer commented on the issue:
https://github.com/apache/cloudstack/pull/1645
I took a look at the code last night and it seems that we're no longer
specifying the source format when calling qemu-img convert. We're relying on
qemu-img's auto detection of source format and just specifying the output
format.
See here:
https://github.com/apache/cloudstack/blob/de173bd8921ef926ace405796b4037902ce1979e/plugins/hypervisors/kvm/src/org/apache/cloudstack/utils/qemu/QemuImg.java#L226
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