Re: [PATCH v7 7/8] Acceptance tests: depend on qemu-img

[Wainer dos Santos Moschetta <wainersm@redhat.com>]

On 11/4/19 1:13 PM, Cleber Rosa wrote:
> Tests using the avocado.utils.vmimage library make use of qemu-img,
> and because it makes sense to use the version matching the rest of the
> source code, let's make sure it gets built.
>
> Its selection, instead of a possible qemu-img binary installed system
> wide, is already dealt with by the change that adds the build dir to
> the PATH during the test execution.
>
> This is based on the same work for qemu-iotests, and suggested by its
> author:
>
>    - https://lists.gnu.org/archive/html/qemu-devel/2019-02/msg00951.html
>
> CC: Philippe Mathieu-Daudé <philmd@redhat.com>
> Signed-off-by: Cleber Rosa <crosa@redhat.com>
> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
> ---
>   tests/Makefile.include | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/tests/Makefile.include b/tests/Makefile.include
> index 65e85f5275..559c3e6375 100644
> --- a/tests/Makefile.include
> +++ b/tests/Makefile.include
> @@ -1174,7 +1174,7 @@ $(TESTS_RESULTS_DIR):
>   
>   check-venv: $(TESTS_VENV_DIR)
>   
> -check-acceptance: check-venv $(TESTS_RESULTS_DIR)
> +check-acceptance: check-venv $(TESTS_RESULTS_DIR) qemu-img$(EXESUF)

To be honest, I don't fell comfortable by the fact that the whole 
acceptance suite will depend on qemu-img which, in reality, is needed by 
only a sub-set of tests. Besides it, there might be some reason for 
someone to build QEMU with --disable-tools and this change will end up 
forcing the qemu-img built (of course if check-acceptance is issued).

What if we instead:

1. Warn the users in case qemu tools weren't built. Alerting that 
qemu-img and friends will be picked up from system-wide (if any).

2. The tests that rely on avocado.utils.vmimage check for the presence 
of dependent tools, possible canceling itself on their lack. This may be 
done at test code level or perhaps using Avocado's tag mechanism + 
tweaking avocado_qemu.

Thanks,

Wainer

>   	$(call quiet-command, \
>               $(TESTS_VENV_DIR)/bin/python -m avocado \
>               --show=$(AVOCADO_SHOW) run --job-results-dir=$(TESTS_RESULTS_DIR) \