[PATCH 1/2] tests/acceptance: Ignore binary data sent on serial console

["Philippe Mathieu-Daudé" <f4bug@amsat.org>]

If a guest sends binary data on the serial console, we get:

 File "tests/acceptance/avocado_qemu/__init__.py", line 92,
   in _console_interaction msg = console.readline().strip()
 File "/usr/lib64/python3.8/codecs.py", line 322,
   in decode (result, consumed) = self._buffer_decode(data, self.errors, final)
 UnicodeDecodeError: 'utf-8' codec can't decode byte 0xa9 in position 2: invalid start byte

Since we use the console with readline(), fix it the easiest
way possible: ignore binary data (all current tests compare
text string anyway).

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
---
 tests/acceptance/avocado_qemu/__init__.py | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/tests/acceptance/avocado_qemu/__init__.py b/tests/acceptance/avocado_qemu/__init__.py
index 83b1741ec85..b55578e1cca 100644
--- a/tests/acceptance/avocado_qemu/__init__.py
+++ b/tests/acceptance/avocado_qemu/__init__.py
@@ -82,14 +82,17 @@ def _console_interaction(test, success_message, failure_message,
     assert not keep_sending or send_string
     if vm is None:
         vm = test.vm
-    console = vm.console_socket.makefile()
+    console = vm.console_socket.makefile(mode='rb', encoding='utf-8')
     console_logger = logging.getLogger('console')
     while True:
         if send_string:
             vm.console_socket.sendall(send_string.encode())
             if not keep_sending:
                 send_string = None # send only once
-        msg = console.readline().strip()
+        try:
+            msg = console.readline().decode().strip()
+        except UnicodeDecodeError:
+            msg = None
         if not msg:
             continue
         console_logger.debug(msg)
-- 
2.26.3