Re: [Qemu-devel] [PATCH 1/3] iotests.py: Add qemu_nbd_pipe()

[Eric Blake <eblake@redhat.com>]

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On 12/21/18 5:47 PM, Max Reitz wrote:
> In some cases, we may want to deal with qemu-nbd errors (e.g. by
> launching it in a different configuration until it no longer throws
> any).  In that case, we do not want its output ending up in the test
> output.
> 
> It may still be useful for handling the error, though, so add a new
> function that works basically like qemu_nbd(), only that it returns the
> qemu-nbd output instead of making it end up in the log.  In contrast to
> qemu_img_pipe(), it does still return the exit code as well, though,

In contrast to qemu_nbd(),

> because that is even more important for error handling.
> 
> Signed-off-by: Max Reitz <mreitz@redhat.com>
> ---
>  tests/qemu-iotests/iotests.py | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
> 
> diff --git a/tests/qemu-iotests/iotests.py b/tests/qemu-iotests/iotests.py
> index d537538ba0..9c3eb9e2f8 100644
> --- a/tests/qemu-iotests/iotests.py
> +++ b/tests/qemu-iotests/iotests.py
> @@ -190,6 +190,20 @@ def qemu_nbd(*args):
>      '''Run qemu-nbd in daemon mode and return the parent's exit code'''
>      return subprocess.call(qemu_nbd_args + ['--fork'] + list(args))
>  
> +def qemu_nbd_pipe(*args):
> +    '''Run qemu-nbd in daemon mode and return both the parent's exit code
> +       and its output'''
> +    subp = subprocess.Popen(qemu_nbd_args + ['--fork'] + list(args),
> +                            stdout=subprocess.PIPE,
> +                            stderr=subprocess.STDOUT,
> +                            universal_newlines=True)
> +    exitcode = subp.wait()
> +    if exitcode < 0:
> +        sys.stderr.write('qemu-nbd received signal %i: %s\n' %
> +                         (-exitcode,
> +                          ' '.join(qemu_nbd_args + ['--fork'] + list(args))))
> +    return exitcode, subp.communicate()[0]
> +

Reviewed-by: Eric Blake <eblake@redhat.com>

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3226
Virtualization:  qemu.org | libvirt.org


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