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smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 1839E10820E0; Tue, 3 Mar 2020 20:00:46 +0000 (UTC) Received: from [10.10.126.35] (ovpn-126-35.rdu2.redhat.com [10.10.126.35]) by smtp.corp.redhat.com (Postfix) with ESMTP id 6BA0560BE1; Tue, 3 Mar 2020 20:00:45 +0000 (UTC) Subject: Re: [PATCH v6 6/9] iotests: use python logging for iotests.log() To: Max Reitz , qemu-devel@nongnu.org References: <20200227000639.9644-1-jsnow@redhat.com> <20200227000639.9644-7-jsnow@redhat.com> <302f1aa1-c880-4c2d-4612-902eff6004a3@redhat.com> From: John Snow Autocrypt: addr=jsnow@redhat.com; prefer-encrypt=mutual; keydata= mQINBFTKefwBEAChvwqYC6saTzawbih87LqBYq0d5A8jXYXaiFMV/EvMSDqqY4EY6whXliNO IYzhgrPEe7ZmPxbCSe4iMykjhwMh5byIHDoPGDU+FsQty2KXuoxto+ZdrP9gymAgmyqdk3aV 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X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Kevin Wolf , qemu-block@nongnu.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 2/27/20 9:21 AM, Max Reitz wrote: > 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 >> --- >> 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(-) >=20 > [...] >=20 >> 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 @@ >> =20 >> assert sys.version_info >=3D (3, 6) >> =20 >> +# Use this logger for logging messages directly from the iotests module >> +logger =3D logging.getLogger('qemu.iotests') >> +logger.addHandler(logging.NullHandler()) >=20 > 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? >=20 Implicit fallback to root logger which handles them when the root logger is configured, which happens when logging.basicConfig is called. >> +# Use this logger for messages that ought to be used for diff output. >> +test_logger =3D logging.getLogger('qemu.iotests.diff_io') >=20 > Also, why does logger get a null handler and this by default does not? > I=E2=80=99m asking because test_logger makes it look like you don=E2=80= =99t necessarily > need a handler for output to be silently discarded. >=20 > Max >=20 It's a library trick. By adding a null handler at `qemu.iotests` I add a default handler to everything produced by iotests. When logging is not configured, this stops messages from being printed -- there IS a default "nonconfigured" logging behavior and this stops it. What I learned since the last time I wrote this patchset is that you only need a NullHandler at some particular root, so "qemu.iotests" suffices. "qemu.iotests.diff_io" is a child of that other logger. >> # 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 =3D [os.environ.get('QEMU_IMG_PROG', 'qemu-img')] >=20 --=20 =E2=80=94js