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certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id A2EC8107ACCD; Thu, 14 May 2020 05:06:45 +0000 (UTC) Received: from [10.10.113.9] (ovpn-113-9.rdu2.redhat.com [10.10.113.9]) by smtp.corp.redhat.com (Postfix) with ESMTP id E64306E70D; Thu, 14 May 2020 05:06:43 +0000 (UTC) Subject: Re: [PATCH v3 06/10] iotests: add testfinder.py To: Vladimir Sementsov-Ogievskiy , Kevin Wolf References: <20200421073601.28710-1-vsementsov@virtuozzo.com> <20200421073601.28710-7-vsementsov@virtuozzo.com> <20200421165647.GE22440@linux.fritz.box> <5a185a4e-1c5d-9887-c88c-6ca71ebeeee1@virtuozzo.com> <2a62c728-1607-1375-6126-713bd047d5b1@virtuozzo.com> From: John Snow Autocrypt: addr=jsnow@redhat.com; prefer-encrypt=mutual; keydata= mQINBFTKefwBEAChvwqYC6saTzawbih87LqBYq0d5A8jXYXaiFMV/EvMSDqqY4EY6whXliNO IYzhgrPEe7ZmPxbCSe4iMykjhwMh5byIHDoPGDU+FsQty2KXuoxto+ZdrP9gymAgmyqdk3aV vzzmCa3cOppcqKvA0Kqr10UeX/z4OMVV390V+DVWUvzXpda45/Sxup57pk+hyY52wxxjIqef 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X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001 autolearn=_AUTOLEARN X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: den@openvz.org, qemu-devel@nongnu.org, qemu-block@nongnu.org, mreitz@redhat.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 5/14/20 12:54 AM, Vladimir Sementsov-Ogievskiy wrote: > 14.05.2020 00:58, John Snow wrote: >> >> >> On 5/7/20 1:43 PM, Vladimir Sementsov-Ogievskiy wrote: >>> 21.04.2020 19:56, Kevin Wolf wrote: >>>> Am 21.04.2020 um 09:35 hat Vladimir Sementsov-Ogievskiy geschrieben: >>>>> Add python script with new logic of searching for tests: >>>>> >>>>> Current ./check behavior: >>>>>    - tests are named [0-9][0-9][0-9] >>>>>    - tests must be registered in group file (even if test doesn't >>>>> belong >>>>>      to any group, like 142) >>>>> >>>>> Behavior of new test: >>>>>    - group file is dropped >>>>>    - tests are searched by file-name instead of group file, so it's >>>>> not >>>>>      needed more to "register the test", just create it with name >>>>>      *-test. Old names like [0-9][0-9][0-9] are supported too, but not >>>>>      recommended for new tests >>>> >>>> I wonder if a tests/ subdirectory instead of the -test suffix would >>>> organise things a bit better. >>>> >>> >>> It will make more difficult to import iotests.py.. Calling common.rc >>> from >>> bash tests will need to be modified too. >>> >>> So, we'll need additional line in all python tests: >>> >>> sys.path.append(os.path.join(os.path.dirname(__file__), '..')) >>> >>> which doesn't seem to be good practice.. So, instead we'd better call >>> tests with PYTHONPATH set appropriately.. >>> >> >> Just chiming in to say that it's largely bad practice because it >> confuses pylint, mypy and friends -- if we want to keep pushing our CI >> code analysis for python in that direction, this will be a barrier. >> >> Using PYTHONPATH is better, because it isolates the script itself from >> the environment, but requires you to now always set PYTHONPATH to >> execute any of the individual iotests. >> >> Not actually a big deal, because iotests already expect a large number >> of environment variables to be set. It's not really a huge net loss in >> convenience, I think. >> >> looks like that's the direction you're headed in anyway based on >> discussion, so that's good. >> > > Hm, does PYTHONPATH-way works good with mypy and friends? Probably, it > should > be set when checking the code? So, actually developers will have to set > PYTHONPATH by hand to always contain some directories within qemu source > tree? > pylint respects PYTHONPATH but mypy doesn't. mypy uses MYPYPATH, but I wouldn't worry about accommodating it. It's a fussy tool and we're only ever going to run it from very specific environments. You don't need to worry too much about what environment variables these tools take; it's only worth noting that "sys.path" hacks tend to make these tools harder to use. As for setting PYTHONPATH by hand ... There are a few places in the QEMU tree where we set PYTHONPATH already, and the individual iotests already don't work if they're not launched by `check`, because they're missing a ton of environment variables. It's not going to be too bad to set PYTHONPATH in the launcher script, is it? (Or are we replacing the top-level script with a python one?) Really, the same is true of pylint, too. It's only annoying to deal with sys.path hacking because it can't be worked around in those CQA tools.