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snapshot=on fails with non file-based storage
The snapshot=on option doesn't work with an nbd block device:
/usr/bin/qemu-system-x86_64 \
[...]
-device virtio-scsi-pci,id=scsi \
-drive file=nbd:localhost:61930,snapshot=on,format=raw,id=hd0,if=none \
-device scsi-hd,drive=hd0 \
[...]
gives the error:
qemu-system-x86_64: -drive file=nbd:localhost:61930,snapshot=on,format=raw,id=hd0,if=none: could not open disk image nbd:localhost:61930: No such file or directory
If you remove the snapshot=on flag, it works (although that of course means that the block device is writable which we don't want).
Previously reported here:
http://permalink.gmane.org/gmane.comp.emulators.qemu/148390
and I can confirm this still happens in qemu 1.4.0.
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