Re: [PATCH v4 3/7] Acceptance tests: Add interrupt_interactive_console_until_pattern()

["Philippe Mathieu-Daudé" <philmd@redhat.com>]

On 1/21/20 12:51 AM, Philippe Mathieu-Daudé wrote:
> We need a function to interrupt interactive consoles.
> 
> Example: Interrupt U-Boot to set different environment values.
> 
> Tested-by: Niek Linnenbank <nieklinnenbank@gmail.com>
> Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
> ---
>   tests/acceptance/avocado_qemu/__init__.py | 32 +++++++++++++++++++++--
>   1 file changed, 30 insertions(+), 2 deletions(-)
> 
> diff --git a/tests/acceptance/avocado_qemu/__init__.py b/tests/acceptance/avocado_qemu/__init__.py
> index 0a50fcf2be..d4358eb431 100644
> --- a/tests/acceptance/avocado_qemu/__init__.py
> +++ b/tests/acceptance/avocado_qemu/__init__.py
> @@ -56,13 +56,15 @@ def pick_default_qemu_bin(arch=None):
>   
>   
>   def _console_interaction(test, success_message, failure_message,
> -                         send_string):
> +                         send_string, keep_sending=False):
> +    assert not keep_sending or send_string
>       console = test.vm.console_socket.makefile()
>       console_logger = logging.getLogger('console')
>       while True:
>           if send_string:
>               test.vm.console_socket.sendall(send_string.encode())
> -            send_string = None # send only once
> +            if not keep_sending:
> +                send_string = None # send only once
>           msg = console.readline().strip()
>           if not msg:
>               continue
> @@ -74,6 +76,32 @@ def _console_interaction(test, success_message, failure_message,
>               fail = 'Failure message found in console: %s' % failure_message
>               test.fail(fail)
>   
> +def interrupt_interactive_console_until_pattern(test, success_message,
> +                                                failure_message=None,
> +                                                interrupt_string='\r'):
> +    """
> +    Keep sending a string to interrupt a console prompt, while logging the
> +    console output. Typical use case is to break a boot loader prompt, such:
> +
> +        Press a key within 5 seconds to interrupt boot process.
> +        5
> +        4
> +        3
> +        2
> +        1
> +        Booting default image...
> +
> +    :param test: an Avocado test containing a VM that will have its console
> +                 read and probed for a success or failure message
> +    :type test: :class:`avocado_qemu.Test`
> +    :param success_message: if this message appears, test succeeds
> +    :param failure_message: if this message appears, test fails
> +    :param interrupt_string: a string to send to the console before trying
> +                             to read a new line
> +    """
> +    _console_interaction(test, success_message, failure_message,
> +                         interrupt_string, True)
> +
>   def wait_for_console_pattern(test, success_message, failure_message=None):
>       """
>       Waits for messages to appear on the console, while logging the content
> 

Thanks, applied to my python-next tree:
https://gitlab.com/philmd/qemu/commits/python-next