From patchwork Mon Nov 9 13:39:25 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Paolo Bonzini X-Patchwork-Id: 11891535 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id BF9D115E6 for ; Mon, 9 Nov 2020 13:40:47 +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 6493B20658 for ; Mon, 9 Nov 2020 13:40:47 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="TTpgl/BD" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 6493B20658 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Received: from localhost ([::1]:57558 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kc7PZ-0006RJ-W9 for patchwork-qemu-devel@patchwork.kernel.org; Mon, 09 Nov 2020 08:40:46 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:58924) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kc7OV-0004rA-Pn for qemu-devel@nongnu.org; Mon, 09 Nov 2020 08:39:39 -0500 Received: from us-smtp-delivery-124.mimecast.com ([63.128.21.124]:49930) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1kc7OS-0000hs-Lc for qemu-devel@nongnu.org; Mon, 09 Nov 2020 08:39:39 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1604929175; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=zQ4bmEIBY00lsT0aN9BEUEYGWs/jZxiMoowXTzHTQ38=; b=TTpgl/BDiBmmdjIONt1lxyRR27G6rnK/rj5XEgpv6xSGvBryV2p33siHsuRYLXTqabGH2O 7fRDhrGCG6iO2PouNOoa+oYK2qm0HTYzJyc44hpwzMGz/og/kqEWQH1FZdDJaEhc7F4sGe /9fd2DYPNNQFBi0/CjGQnkQS/8bOXRs= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-492-PZReZDjXMby9Gue1QkcwpQ-1; Mon, 09 Nov 2020 08:39:33 -0500 X-MC-Unique: PZReZDjXMby9Gue1QkcwpQ-1 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 508D61018F73 for ; Mon, 9 Nov 2020 13:39:32 +0000 (UTC) Received: from virtlab701.virt.lab.eng.bos.redhat.com (virtlab701.virt.lab.eng.bos.redhat.com [10.19.152.228]) by smtp.corp.redhat.com (Postfix) with ESMTP id 032EB6EF48; Mon, 9 Nov 2020 13:39:31 +0000 (UTC) From: Paolo Bonzini To: qemu-devel@nongnu.org Subject: [PATCH v2 for-5.2 0/6] Deprecate or forbid crazy QemuOpts cases Date: Mon, 9 Nov 2020 08:39:25 -0500 Message-Id: <20201109133931.979563-1-pbonzini@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=pbonzini@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Received-SPF: pass client-ip=63.128.21.124; envelope-from=pbonzini@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/11/09 01:25:23 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, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no 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: armbru@redhat.com Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" It's very hard to make QemuOpts fail. It's also very easy to write command lines that QemuOpts accept but make no sense. This series deals with three cases: - QemuOpts accepts ids even for options that are meant to be singletons. As a result, a command line option like "-M q35,id=ff" is ignored silently. - QemuOpts simply matches "help" or "?" against the option name to determine whether the user asked for help. Something like "nohelp" or "?=please" will print the help message. - QemuOpts lets you write boolean options in "short form" where "abc" means "abc=on" and "noabc" means "abc=off". This is confusing, since it is not done for the first key=value pair (but only if there is an implied key); it can also be grossly misused, as in the previous example, because it is not type safe. In case you need confirmation, "-device e1000,noid" will create a device with id equal to "off". Unfortunately, this last idiom has found wide use with -chardev (think "server,nowait") and to a lesser extent -spice, so it can only be deprecated. The other two are removed. Patches 1-3 are cleanups. Patches 4-6 deal with the above issues one by one. I have a seventh patch to remove the third argument to qemu_opts_create, but it touches a few dozen files. Paolo Supersedes: <20201105142731.623428-1-pbonzini@redhat.com> Paolo Bonzini (6): qemu-option: simplify search for end of key qemu-option: pass QemuOptsList to opts_accepts_any qemu-option: restrict qemu_opts_set to merge-lists QemuOpts qemu-option: clean up id vs. list->merge_lists qemu-option: move help handling to get_opt_name_value qemu-option: warn for short-form boolean options docs/system/deprecated.rst | 6 ++ include/qemu/option.h | 3 +- softmmu/vl.c | 19 ++--- tests/test-qemu-opts.c | 26 ++++++- util/qemu-option.c | 149 +++++++++++++++++++------------------ 5 files changed, 113 insertions(+), 90 deletions(-)