http was 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 | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/v2v/rhv-upload-plugin.py b/v2v/rhv-upload-plugin.py
index 2eec375f7..0f6b31e67 100644
--- a/v2v/rhv-upload-plugin.py
+++ b/v2v/rhv-upload-plugin.py
@@ -338,6 +338,8 @@ def zero(h, count, offset, may_trim):
     r.read()

 def emulate_zero(h, count, offset):
+    http = h['http']

+
     # 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