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[72.10.130.87]) by smtp.gmail.com with ESMTPSA id ou6-20020a05620a620600b00763b94432ebsm180166qkn.18.2023.11.07.10.58.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 07 Nov 2023 10:58:51 -0800 (PST) From: Maxim Cournoyer To: Suhail Cc: Felix Lechner via , Julien Lepiller , Felix Lechner , Simon Tournier Subject: Re: Turning off tests leads to a different store item In-Reply-To: <65429087.0c0a0220.5908c.4d60SMTPIN_ADDED_BROKEN@mx.google.com> (suhail@bayesians.ca's message of "Wed, 01 Nov 2023 17:52:37 +0000") References: <65429087.0c0a0220.5908c.4d60SMTPIN_ADDED_BROKEN@mx.google.com> Date: Tue, 07 Nov 2023 13:58:50 -0500 Message-ID: <87zfzpie51.fsf@gmail.com> User-Agent: Gnus/5.13 (Gnus v5.13) MIME-Version: 1.0 Content-Type: text/plain Received-SPF: pass client-ip=2607:f8b0:4864:20::1131; envelope-from=maxim.cournoyer@gmail.com; helo=mail-yw1-x1131.google.com 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, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: help-guix@gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: help-guix-bounces+larch=yhetil.org@gnu.org Sender: help-guix-bounces+larch=yhetil.org@gnu.org X-Migadu-Flow: FLOW_IN X-Migadu-Country: US X-Migadu-Spam-Score: -7.88 X-Spam-Score: -7.88 X-Migadu-Queue-Id: 248E35701B X-Migadu-Scanner: mx13.migadu.com X-TUID: 9VsP/yYpMDQU Hi, Suhail writes: > Felix Lechner via writes: > >> On Tue, Oct 31 2023, Julien Lepiller wrote: >> >>> You could skip tests, but that would build a different derivation >>> tree, so it might affect reproducibility >> >> Those shortfalls are a consequence of our packaging habits. In an ideal >> world, would running a test suite ever build a different derivation? You seem to be confusing 'derivation', which is the build recipe description that a package "compiles" to, with the package output, the result of executing the derivation. While I wouldn't expect the package output to change unless tests are installed when disabling the test suite, the derivation changes to account for the different build arguments used (e.g. that #:tests? #t vs #:tests? #f). Running tests *may* cause the output derivation to be different. I remember a bug in Python that would cause some time stamps to be embedded in the .pyc when running the test suite (!). I think it's safer to assume that a derivation with test enabled is not the same as a derivation with tests disabled. There was the "Intensional Store" RFC in Nix that tried to address that [0]; it may be worth reading but it looks like it comes with a lot of caveats and complexity. [0] https://github.com/NixOS/rfcs/pull/17 -- Thanks, Maxim