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Thu, 02 Nov 2023 01:39:05 -0700 (PDT) X-Google-Smtp-Source: AGHT+IF3knVQ0L/tnfNAgJEZeTnlmPjnsgBBj50DPjoYVaHoexGentqerhlSklSJA3JS4kMaWSDBjg== X-Received: by 2002:a17:906:6547:b0:9b2:b149:b816 with SMTP id u7-20020a170906654700b009b2b149b816mr10586760ejn.7.1698914345221; Thu, 02 Nov 2023 01:39:05 -0700 (PDT) Received: from [10.0.0.196] ([37.186.169.33]) by smtp.gmail.com with ESMTPSA id gl4-20020a170906e0c400b009786c8249d6sm849959ejb.175.2023.11.02.01.39.04 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 02 Nov 2023 01:39:04 -0700 (PDT) Message-ID: <9a0026db5f43f2b8eeff4b35404387e48dbac0fd.camel@redhat.com> Subject: Re: [PATCH nft 2/7] json: drop messages "warning: stmt ops chain have no json callback" From: Thomas Haller To: Florian Westphal Cc: NetFilter Date: Thu, 02 Nov 2023 09:39:03 +0100 In-Reply-To: <20231102080454.GA23579@breakpoint.cc> References: <20231031185449.1033380-1-thaller@redhat.com> <20231031185449.1033380-3-thaller@redhat.com> <20231102080454.GA23579@breakpoint.cc> Autocrypt: addr=thaller@redhat.com; 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charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.50.0 (3.50.0-1.fc39) MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netfilter-devel@vger.kernel.org On Thu, 2023-11-02 at 09:04 +0100, Florian Westphal wrote: > Thomas Haller wrote: > > This message purely depends on the internal callbacks and at the > > program > > code. This is not useful. What is the user going to do with this > > warning? >=20 > Report a bug. The way the message is worded ("warning:"), doesn't sound as if a user should feel invited to report a bug. > > Maybe there is a bug here, but then we shouldn't print a warning > > but fix > > the bug. >=20 > How on earth do we do that, fix a bug before we know its there? Writing tests that perform basic consistency checks of things that must hold. A unit test should check whether ops structs are consistent. This patchset also enables a test that hits this problem (for "chain" ops). If there is a bug, then an assertion (or just a plain crash) would be preferable over printing a "warning" to stderr. >=20 > > For example, calling `nft -j list ruleset` after test > > "tests/shell/testcases/chains/0041chain_binding_0" > > will trigger messages like: > >=20 > > =C2=A0 warning: stmt ops chain have no json callback > > =C2=A0 warning: stmt ops chain have no json callback >=20 > That means that chain ops needs a bug fix as they do not support > json output? I don't know. The message might just trying to be helpful, and there is no actual problem. The condition is attempted to be handled by the following code. I don't know which it is. Me sending the patch is basically asking that question. Thomas