From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.0 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 67103C433E0 for ; Fri, 19 Jun 2020 17:17:53 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 22E222083B for ; Fri, 19 Jun 2020 17:17:53 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="DqRMVjkO" 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certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 2421E835B5C; Fri, 19 Jun 2020 17:14:35 +0000 (UTC) Received: from [10.10.117.188] (ovpn-117-188.rdu2.redhat.com [10.10.117.188]) by smtp.corp.redhat.com (Postfix) with ESMTP id BB79B60BE1; Fri, 19 Jun 2020 17:14:29 +0000 (UTC) Subject: Re: [PATCH 0/7] python: create installable package To: Kevin Wolf References: <20200603001523.18085-1-jsnow@redhat.com> <20200617195241.GA434320@localhost.localdomain> <32791435-4aa4-7eaa-e2c6-b53165f2e28d@redhat.com> <20200618092319.GA6012@linux.fritz.box> <5944404f-3833-3bc5-d3e4-1cf459b4c0c1@redhat.com> <20200619164459.GD5036@linux.fritz.box> 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-Spam_score_int: -30 X-Spam_score: -3.1 X-Spam_bar: --- X-Spam_report: (-3.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_NONE=0.001, 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: Fam Zheng , Vladimir Sementsov-Ogievskiy , Eduardo Habkost , qemu-block@nongnu.org, =?UTF-8?Q?Philippe_Mathieu-Daud=c3=a9?= , Markus Armbruster , qemu-devel@nongnu.org, Stefan Hajnoczi , Cleber Rosa , Max Reitz , =?UTF-8?Q?Alex_Benn=c3=a9e?= Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 6/19/20 12:44 PM, Kevin Wolf wrote: > Am 19.06.2020 um 17:04 hat John Snow geschrieben: >> On 6/18/20 5:23 AM, Kevin Wolf wrote: >>> Am 17.06.2020 um 22:27 hat John Snow geschrieben: >>>>> In the Avocado project, we have a `make develop` rule that does that >>>>> for the main setup.py file, and for all plugins we carry on the same >>>>> tree, which is similar in some regards to the "not at the project root >>>>> directory" situation here with "qemu/python/setup.py". >>>>> >>>> >>>> Ah, yeah. If we're going this far, I'd prefer using a VENV over >>>> modifying the user's environment. That way you can blast it all away >>>> with a `make distclean`. >>>> >>>> Maybe the "make develop" target could even use the presence of a .venv >>>> directory to know when it needs to make the environment or not ... >>> [..] >>>> For QEMU developers, installing with develop is going to be the smart >>>> way to go. When your git tree is updated, your package will be updated >>>> along with it. You can do it once and then probably forget about it. >>> >>> I don't think we can make this a manual step at all. Building QEMU >>> requires running some Python scripts (e.g. the QAPI generator), so the >>> setup needs to be done either in configure or in a Makefile target that >>> is specified as a dependency of any rule that would run a Python script. >>> Building QEMU once would then be enough. >> >> I am imagining that we might treat "building" and "testing" separately >> -- as it is, builds require python3.5 and tests requires 3.6 which >> definitely necessitates two distinct environments. > > I'm not sure what the exact definition of "end of life" of a distro is > that we're using. I seem to remember that the reason for using Python > 3.5 was Debian Stretch. Its official end of life is in about three > weeks, but then there is still some LTS thing with reduced support done > by a different group. > > If we read our policy literally and use the regular end of life, I guess > we could just move QEMU to 3.6 for everything. > I think we have kinda-sorta-agreed to exclude the third-party LTS support. I think we will be able to move to Python 3.6 shortly. That'd solve one problem. >> I will admit that I haven't constructed a full, coherent vision of >> python management that encapsulates both building ad testing yet. For >> example, should configure/make expect to be run inside of a venv, or >> should they expect to create and then enter the venv? That's not clear >> to me yet. I'm simultaneously trying to work out with Peter Maydell how >> the sphinx dependency should work. Sphinx is presently our only python >> dependency for our build environment.) > > It's kind of obvious that this can't require user interaction because we > want ./configure; make to work. So I guess this means the venv needs to > be set up automatically by configure/make? > >> Perhaps starting with the testing step is a good starting point and we >> can use an implicit dependency on a `make develop` style step so it >> happens automatically. >> >> (But perhaps keeping it as a standalone target that CAN be invoked >> manually would be nice if you want to do some more intensive debugging >> or development of new tests.) > > Yes. And you'll have many dependencies on it, so it would be a separate > target anyway. > >>> Doing it automatically also means that we have to keep things local to >>> the QEMU directory rather than installing them globally into the user >>> directory. This is desirable anyway: Most of us deal with more than one >>> QEMU source tree, so conflicts would be inevitable. >> >> I think it should be easy enough to put the VENV in the build directory >> to prevent cross-contamination. > > Sure. I'm not overly familiar with all of this, but I guess my point was > just that a venv is needed rather than a global installation into the > user directory. If nobody ever suggested the latter, blame the > misunderstanding on my non-existent experience with more complex Python > setups. > Python doesn't make it easy to understand, I think. I'll head along in this direction: We want testing to use a venv that exists in the build directory and we want to automate its creation and usage. I am still working out the role of Python/VENVs at configure time with Peter Maydell in another thread which may answer the other half of the equation for me. --js > Kevin >