[PATCH v3 1/2] avocado_qemu: add exec_command function

[Willian Rampazzo <willianr@redhat.com>]

Sometimes a test needs to send a command to a console without waiting
for a pattern as a result, or the command issued do not produce any kind
of output, like, for example, a `mount` command.

This introduces the `exec_command` function to the avocado_qemu,
allowing the test to send a command to the console without the need to
match a pattern produced as a result.

Signed-off-by: Willian Rampazzo <willianr@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Wainer dos Santos Moschetta <wainersm@redhat.com>
---
 tests/acceptance/avocado_qemu/__init__.py | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/tests/acceptance/avocado_qemu/__init__.py b/tests/acceptance/avocado_qemu/__init__.py
index df167b142c..0e6d286403 100644
--- a/tests/acceptance/avocado_qemu/__init__.py
+++ b/tests/acceptance/avocado_qemu/__init__.py
@@ -93,7 +93,7 @@ def _console_interaction(test, success_message, failure_message,
         if not msg:
             continue
         console_logger.debug(msg)
-        if success_message in msg:
+        if success_message is None or success_message in msg:
             break
         if failure_message and failure_message in msg:
             console.close()
@@ -139,6 +139,18 @@ def wait_for_console_pattern(test, success_message, failure_message=None,
     """
     _console_interaction(test, success_message, failure_message, None, vm=vm)
 
+def exec_command(test, command):
+    """
+    Send a command to a console (appending CRLF characters), while logging
+    the content.
+
+    :param test: an Avocado test containing a VM.
+    :type test: :class:`avocado_qemu.Test`
+    :param command: the command to send
+    :type command: str
+    """
+    _console_interaction(test, None, None, command + '\r')
+
 def exec_command_and_wait_for_pattern(test, command,
                                       success_message, failure_message=None):
     """
-- 
2.29.2