Re: [Qemu-block] [Qemu-devel] [PATCH 0/3] build configuration query tool and conditional (qemu-io)test skip

[Stefan Hajnoczi]

On Thu, Jul 20, 2017 at 11:47:27PM -0400, Cleber Rosa wrote:
> This is a follow up to a previous discussion about reported failures when
> running some qemu-iotests.  Turns out the failures were due to missing
> libraries, which in turn, reflected on the host build configuration.
> 
> This series introduces a tool that can check both host and target level
> build configurations.  On top of that, it adds a function to to be used
> on qemu-iotests.  Finally, as an example, it sets a test to be skipped
> if the required feature is not enable on the host build configuration.
> 
> Cleber Rosa (3):
>   scripts: introduce buildconf.py
>   qemu-iotests: add _require_feature() function
>   qemu-iotests: require CONFIG_LINUX_AIO for test 087
> 
>  scripts/buildconf.py         | 278 
> +++++++++++++++++++++++++++++++++++++++++++
>  tests/qemu-iotests/087       |   1 +
>  tests/qemu-iotests/check     |   2 +
>  tests/qemu-iotests/common.rc |   7 ++
>  4 files changed, 288 insertions(+)
> 

It should be possible to run iotests against any
qemu/qemu-img/qemu-io/qemu-nbd binaries - even if no build root is
available.

How about invoking qemu-img and tools to determine their capabilities?

At the beginning of ./check, query the qemu/qemu-img/qemu-io/qemu-nbd
binaries for specific features.  This produces a set of available
features and tests can say:

  _supported_feature aio_native

This feature can be checked by opening an image file:

  qemu-io --format raw --nocache --native-aio --cmd quit test.img

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