"http" and "transfer" variables were missing in emulate_zero, so the code would fail with NameError. This can happen only when communicating with old imageio versions not supporting the "zero" feature. Testing with qemu-img 2.12 show that we never send emulated zero request because of the highestwrite mechanism, but it can break with older qemu-img-rhev used on RHEL. --- v2v/rhv-upload-plugin.py | 3 +++ 1 file changed, 3 insertions(+) diff --git a/v2v/rhv-upload-plugin.py b/v2v/rhv-upload-plugin.py index 2eec375f7..10887c031 100644 --- a/v2v/rhv-upload-plugin.py +++ b/v2v/rhv-upload-plugin.py @@ -338,6 +338,9 @@ def zero(h, count, offset, may_trim): r.read() def emulate_zero(h, count, offset): + http = h['http'] + transfer = h['transfer'] + # qemu-img convert starts by trying to zero/trim the whole device. # Since we've just created a new disk it's safe to ignore these # requests as long as they are smaller than the highest write seen. -- 2.17.1