wrapper: set stdin for virt-v2v to /dev/null

We don't plan to steer virt-v2v workflow by providing input on stdin and
answering questions. Hence there is no reason to keep stdin attached. In
fact, redirecting it to /dev/null can avoid bad "answers" when virt-v2v
decides to be interactive and starts asking questions.

Signed-off-by: Tomáš Golembiovský <tgolembi@redhat.com>

Author: nyoxi

files/virt-v2v-wrapper.py

@@ -396,6 +396,7 @@ def wrapper(data, state_file, v2v_log, agent_sock=None):
                      v2v_args, env)
         proc = subprocess.Popen(
                 v2v_args,
+                stdin=subprocess.DEVNULL,
                 stderr=subprocess.STDOUT,
                 stdout=log,
                 env=env,