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Re: [PATCH v6 6/9] iotests: use python logging for iotests.log()


From: Max Reitz
Subject: Re: [PATCH v6 6/9] iotests: use python logging for iotests.log()
Date: Thu, 27 Feb 2020 15:21:37 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.5.0

On 27.02.20 01:06, John Snow wrote:
> We can turn logging on/off globally instead of per-function.
> 
> Remove use_log from run_job, and use python logging to turn on
> diffable output when we run through a script entry point.
> 
> iotest 245 changes output order due to buffering reasons.
> 
> Signed-off-by: John Snow <address@hidden>
> ---
>  tests/qemu-iotests/030        |  4 +--
>  tests/qemu-iotests/245        |  1 +
>  tests/qemu-iotests/245.out    | 24 ++++++++---------
>  tests/qemu-iotests/iotests.py | 50 +++++++++++++++++++++--------------
>  4 files changed, 45 insertions(+), 34 deletions(-)

[...]

> diff --git a/tests/qemu-iotests/iotests.py b/tests/qemu-iotests/iotests.py
> index b02d7932fa..60c4c7f736 100644
> --- a/tests/qemu-iotests/iotests.py
> +++ b/tests/qemu-iotests/iotests.py
> @@ -35,6 +35,14 @@
>  
>  assert sys.version_info >= (3, 6)
>  
> +# Use this logger for logging messages directly from the iotests module
> +logger = logging.getLogger('qemu.iotests')
> +logger.addHandler(logging.NullHandler())

Hm, I never see another handler added to this, so how can these messages
actually be printed?  Will enabling debug mode somehow make all loggers
print everything?

> +# Use this logger for messages that ought to be used for diff output.
> +test_logger = logging.getLogger('qemu.iotests.diff_io')

Also, why does logger get a null handler and this by default does not?
I’m asking because test_logger makes it look like you don’t necessarily
need a handler for output to be silently discarded.

Max

>  # This will not work if arguments contain spaces but is necessary if we
>  # want to support the override options that ./check supports.
>  qemu_img_args = [os.environ.get('QEMU_IMG_PROG', 'qemu-img')]

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