[PATCH 3/4] tests/avocado: exec_command should not consume console output

[Nicholas Piggin <npiggin@gmail.com>]

_console_interaction reads data from the console even when there is only
an input string to send, and no output data to wait on. This can cause
lines to be missed by wait_for_console_pattern calls that follows an
exec_command. Fix this by not reading the console if there is no pattern
to wait for.

This solves occasional hangs in ppc_hv_tests.py, usually when run on KVM
hosts that are fast enough to output important lines quickly enough to be
consumed by exec_command, so they get missed by subsequent wait for
pattern calls.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
 tests/avocado/avocado_qemu/__init__.py | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/tests/avocado/avocado_qemu/__init__.py b/tests/avocado/avocado_qemu/__init__.py
index 304c428168..5a3ae7f6b5 100644
--- a/tests/avocado/avocado_qemu/__init__.py
+++ b/tests/avocado/avocado_qemu/__init__.py
@@ -144,6 +144,13 @@ def _console_interaction(test, success_message, failure_message,
             vm.console_socket.sendall(send_string.encode())
             if not keep_sending:
                 send_string = None # send only once
+
+        # Only consume console output if waiting for something
+        if success_message is None and failure_message is None:
+            if send_string is None:
+                break
+            continue
+
         try:
             msg = console.readline().decode().strip()
         except UnicodeDecodeError:
-- 
2.42.0