Re: [PATCH] virtiofs_submounts.py test: Note on vmlinuz param

[Cleber Rosa <crosa@redhat.com>]

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On Fri, Feb 12, 2021 at 04:16:49PM +0100, Max Reitz wrote:
> From the cancel message, it is not entirely clear why this parameter is
> mandatory now, or that it will be optional in the future.  Add such a
> more detailed explanation as a comment in the test source file.
> 
> Suggested-by: Alex Bennée <alex.bennee@linaro.org>
> Signed-off-by: Max Reitz <mreitz@redhat.com>
> ---
> I’ve uploaded a build of Linux 5.10 here:
>   https://xanclic.moe/linux-5.10
> 
> But I’ve decided against mentioning it in this new comment or the cancel
> message, because, well, it’s my private server and I have limited
> bandwidth.
> ---
>  tests/acceptance/virtiofs_submounts.py | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
> 
> diff --git a/tests/acceptance/virtiofs_submounts.py b/tests/acceptance/virtiofs_submounts.py
> index 949ca87a83..9a69b6b17b 100644
> --- a/tests/acceptance/virtiofs_submounts.py
> +++ b/tests/acceptance/virtiofs_submounts.py
> @@ -228,6 +228,18 @@ class VirtiofsSubmountsTest(BootLinux):
>      def setUp(self):
>          vmlinuz = self.params.get('vmlinuz')
>          if vmlinuz is None:
> +            """
> +            The Linux kernel supports FUSE auto-submounts only as of 5.10.
> +            boot_linux.py currently provides Fedora 31, whose kernel is too
> +            old, so this test cannot pass with the on-image kernel (you are
> +            welcome to try, hence the option to force such a test with
> +            -p vmlinuz='').  Therefore, for now the user must provide a
> +            sufficiently new custom kernel, or effectively explicitly
> +            request failure with -p vmlinuz=''.
> +            Once an image with a sufficiently new kernel is available
> +            (probably Fedora 34), we can make -p vmlinuz='' the default, so
> +            that this parameter no longer needs to be specified.
> +            """
>              self.cancel('vmlinuz parameter not set; you must point it to a '
>                          'Linux kernel binary to test (to run this test with ' \
>                          'the on-image kernel, set it to an empty string)')
> -- 
> 2.29.2
>

Hi Max,

This looks good to me, and I've also tested your kernel build and
works like a charm.

As further work on top of this, it may be beneficial to have test
documentation in a predictable place.  The possibilities that come to
my mind:

 * docs/devel/testing.rst
 * tests/acceptance/$test_file.py/data/README

On a different topic, the "https://avocado-project.org/data/assets" has
enough bandwidth and can be used to hold this type asset.  Alternatively,
we can add a bit more automation to this test by letting people do something
like:

 $ avocado assets register virtiofs-auto-submounts-vmlinuz /path/to/vmlinuz

And on the test:

 vmlinuz = self.fetch_asset('virtiofs-auto-submounts-vmlinuz')

And the test should cancel if that asset has not been previously registered.

Anyway,

Reviewed-by: Cleber Rosa <crosa@redhat.com>

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