Re: [Qemu-devel] [PATCH v3 07/20] Acceptance tests: look for target architecture in test tags first

[Cornelia Huck <cohuck@redhat.com>]

On Wed, 20 Feb 2019 19:57:40 -0500
Cleber Rosa <crosa@redhat.com> wrote:

> A test can, optionally, be tagged for one or many architectures.  If a
> test has been tagged for a single architecture, there's a high chance
> that the test won't run on other architectures.  This changes the
> default order of choosing a default target architecture to use based
> on the 'arch' tag value first.
> 
> The precedence order is for choosing a QEMU binary to use for a test
> is now:
> 
>  * qemu_bin parameter
>  * arch parameter
>  * arch tag value (for example, x86_64 if ":avocado: tags=arch:x86_64
>    is used)
> 
> This means that if one runs:
> 
>  $ avocado run -p qemu_bin=/usr/bin/qemu-system-x86_64 test.py
> 
> No arch parameter or tag will influence the selection of the QEMU
> target binary.  If one runs:
> 
>  $ avocado run -p arch=ppc64 test.py
> 
> The target binary selection mechanism will attempt to find a binary
> such as "ppc64-softmmu/qemu-system-ppc64".  And finally, if one runs
> a test that is tagged (in its docstring) with "arch:aarch64":
> 
>  $ avocado run aarch64.py
> 
> The target binary selection mechanism will attempt to find a binary
> such as "aarch64-softmmu/qemu-system-aarch64".
> 
> At this time, no provision is made to cancel the execution of tests if
> the arch parameter given (manually) does not match the test "arch"
> tag, but it may be a useful default behavior to be added in the
> future.

Would it be useful as well to cancel a test if the passed-in qemu_bin
parameter clashed with the tagged architecture?

> 
> Signed-off-by: Cleber Rosa <crosa@redhat.com>
> ---
>  docs/devel/testing.rst                    | 4 +++-
>  tests/acceptance/avocado_qemu/__init__.py | 7 ++++++-
>  2 files changed, 9 insertions(+), 2 deletions(-)
> 
> diff --git a/docs/devel/testing.rst b/docs/devel/testing.rst
> index 6035db1b44..87bcf8ef43 100644
> --- a/docs/devel/testing.rst
> +++ b/docs/devel/testing.rst
> @@ -702,7 +702,9 @@ A test may, for instance, use the same value when selecting the
>  architecture of a kernel or disk image to boot a VM with.
>  
>  The ``arch`` attribute will be set to the test parameter of the same
> -name, and if one is not given explicitly, it will be set to ``None``.
> +name.  If one is not given explicitly, it will either be set to
> +``None``, or, if the test is tagged with one (and only one)
> +``:avocado: tags=arch:VALUE`` tag, it will be set to ``VALUE``.
>  
>  qemu_bin
>  ~~~~~~~~
> diff --git a/tests/acceptance/avocado_qemu/__init__.py b/tests/acceptance/avocado_qemu/__init__.py
> index f580582602..9e98d113cb 100644
> --- a/tests/acceptance/avocado_qemu/__init__.py
> +++ b/tests/acceptance/avocado_qemu/__init__.py
> @@ -53,7 +53,12 @@ def pick_default_qemu_bin(arch=None):
>  class Test(avocado.Test):
>      def setUp(self):
>          self.vm = None
> -        self.arch = self.params.get('arch')
> +        arches = self.tags.get('arch', [])
> +        if len(arches) == 1:
> +            arch = arches.pop()
> +        else:
> +            arch = None
> +        self.arch = self.params.get('arch', default=arch)
>          default_qemu_bin = pick_default_qemu_bin(arch=self.arch)
>          self.qemu_bin = self.params.get('qemu_bin',
>                                          default=default_qemu_bin)

Reviewed-by: Cornelia Huck <cohuck@redhat.com>