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=-1.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=ham 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 E6456C04AB5 for ; Mon, 3 Jun 2019 18:03:35 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id AD838218BC for ; Mon, 3 Jun 2019 18:03:35 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org AD838218BC Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass 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AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id C7CF8223882; Mon, 3 Jun 2019 18:02:20 +0000 (UTC) Received: from [10.18.17.164] (dhcp-17-164.bos.redhat.com [10.18.17.164]) by smtp.corp.redhat.com (Postfix) with ESMTP id E5D03601B6; Mon, 3 Jun 2019 18:02:17 +0000 (UTC) To: Markus Armbruster References: <20190531192429.GH22103@habkost.net> <93e5101f-67f1-a416-5e80-f16371a35e6a@redhat.com> <871s0asvli.fsf@dusky.pond.sub.org> From: John Snow Openpgp: preference=signencrypt Autocrypt: addr=jsnow@redhat.com; prefer-encrypt=mutual; keydata= mQINBFTKefwBEAChvwqYC6saTzawbih87LqBYq0d5A8jXYXaiFMV/EvMSDqqY4EY6whXliNO IYzhgrPEe7ZmPxbCSe4iMykjhwMh5byIHDoPGDU+FsQty2KXuoxto+ZdrP9gymAgmyqdk3aV vzzmCa3cOppcqKvA0Kqr10UeX/z4OMVV390V+DVWUvzXpda45/Sxup57pk+hyY52wxxjIqef rj8u5BN93s5uCVTus0oiVA6W+iXYzTvVDStMFVqnTxSxlpZoH5RGKvmoWV3uutByQyBPHW2U 1Y6n6iEZ9MlP3hcDqlo0S8jeP03HaD4gOqCuqLceWF5+2WyHzNfylpNMFVi+Hp0H/nSDtCvQ 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List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Peter Maydell , "Daniel P. Berrange" , Eduardo Habkost , qemu-devel@nongnu.org, Cleber Rosa , =?UTF-8?Q?Philippe_Mathieu-Daud=c3=a9?= Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 6/3/19 8:26 AM, Markus Armbruster wrote: > John Snow writes: > >> On 5/31/19 3:24 PM, Eduardo Habkost wrote: >>> Long story short: I would really like to drop support for Python >>> 2 in QEMU 4.1. > > The sooner, the better, as far as I'm concerned. > >>> What exactly prevents us from doing this? Does our deprecation >>> policy really apply to build dependencies? >>> >> >> Normally I'd say it's only nice to also follow the depreciation policy >> for tooling as well to give people a chance to switch away, but with >> regards to Python2, I feel like we're in the clear to drop it for the >> first release that will happen after the Python2 doomsday clock. >> >> (So, probably 4.2.) > > In addition to our feature deprecation policity, we have a "Supported > build platforms" policy (commit 45b47130f4b). The most common holdback > is this one: > > For distributions with long-lifetime releases, the project will aim > to support the most recent major version at all times. Support for > the previous major version will be dropped 2 years after the new > major version is released. For the purposes of identifying supported > software versions, the project will look at RHEL, Debian, Ubuntu > LTS, and SLES distros. Other long-lifetime distros will be assumed > to ship similar software versions. > > RHEL-7 has Python 3 only in EPEL. RHEL-8 came out last month. Unless > we interpret our policy to include EPEL, this means supporting Python 2 > for some 16 months after upstream Python retires it. My personal > opinion: nuts. > I would rather not support Python2 a day after the clock expires. > I didn't bother checking Debian, Ubuntu LTS and SLES. > > For hosts other than Linux, we're less ambitious. > That policy strikes me as weird, because RHEL7 is not going to be, in general, using the latest and greatest QEMU. Usually stable versions of distros stick with the versions of the programs that came out at the time. What's the benefit of making sure that stable platforms can continue to run the *newest* QEMU? Is this even a reasonable restriction? If you are running RHEL7, how many projects do you expect to be able to git clone and build and have that work with the rest of your legacy/stable dependencies? RHEL7 uses a 1.5.3 based version. I don't think it matters if we update 4.2 to be Python3 only, really.