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List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: guix-devel-bounces+larch=yhetil.org@gnu.org Sender: guix-devel-bounces+larch=yhetil.org@gnu.org X-Migadu-Country: US X-Migadu-Flow: FLOW_IN ARC-Authentication-Results: i=1; aspmx1.migadu.com; dkim=pass header.d=gmail.com header.s=20221208 header.b=QUfKV37W; spf=pass (aspmx1.migadu.com: domain of "guix-devel-bounces+larch=yhetil.org@gnu.org" designates 209.51.188.17 as permitted sender) smtp.mailfrom="guix-devel-bounces+larch=yhetil.org@gnu.org"; dmarc=pass (policy=none) header.from=gmail.com ARC-Seal: i=1; s=key1; d=yhetil.org; t=1681811286; a=rsa-sha256; cv=none; b=jqEfhMG+JLeAKDUwjameSu8fEIVQ2KyBebXBhSRMyPeo2eisBeHaZiwpqPIKIIAtn/se+B GW0caK1uuP0pu/4ZdZjeNYZO3ffvZZXBCbaI8qbavkgh4kz6VaiREGJ0W9jItAyjSALX1m h/y4i9pjD36qq2MqGXgw4NFbfQjLM9gkCK2pul8ekShXP4nFF/kFBSUqULxwZxWWxH34bb J1dBu9r8oyLWaelsfWEfSzs+5bX46/rzL4Po90ZtO/4A+cDsFP6GUddErKAcYXnvB2xecV KwXwCs20+UXgC83txCtE1RWJIvnQL2R/jRDSNeaRWiuLob47Fg2BfmpLQS17wg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=yhetil.org; s=key1; t=1681811286; h=from:from:sender:sender: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: in-reply-to:in-reply-to:references:references:list-id:list-help: list-unsubscribe:list-subscribe:list-post:dkim-signature; bh=jCmT5zK0PA6yDN9Ew9ctfQiVTrsK5Cp9B1lPcaes4/E=; b=ukVUx/JNdLYkbBttk5YtKuE6AawaWjIERFBRSxdoqhrZ7GKkgyBi+TZyQjyHylaGWD9Pa+ 7YtSjEHD03toADqOEKPa36IFjK6f1jJBjm49Su6ij9iwBcW4/yTNF2F3sffUzjpmCZv1Gs 6eeQCEbtbSl7kA2fzEea0+FzNEANJVkDwutFoeTw2wLqmxof0gLJhv/J+fdpXjM4Tz5tqG 49Zla/CLyw7EYFKBes+J5VV5A6IpHD+f8DfKd0ql8s98XNLB0M3OcFr3q9GxHX4w+u1huI baEs5PiJuIuKOdAlr+X+IBs3jbva/bfxgIVmEOyImWfzaCDhyK3Xp3rltP6IoA== X-Migadu-Spam-Score: -9.75 X-Spam-Score: -9.75 X-Migadu-Queue-Id: 4F2761882D X-Migadu-Scanner: scn0.migadu.com Authentication-Results: aspmx1.migadu.com; dkim=pass header.d=gmail.com header.s=20221208 header.b=QUfKV37W; spf=pass (aspmx1.migadu.com: domain of "guix-devel-bounces+larch=yhetil.org@gnu.org" designates 209.51.188.17 as permitted sender) smtp.mailfrom="guix-devel-bounces+larch=yhetil.org@gnu.org"; dmarc=pass (policy=none) header.from=gmail.com X-TUID: fiETaWf92qae Hi, On Mon, 17 Apr 2023 at 15:16, Vagrant Cascadian wrote: > On 2023-04-17, Simon Tournier wrote: >>> My plan is to write a service that makes it easy to offload a build to a >>> VM that runs with a different time (=E2=80=9Cin the past=E2=80=9D) or s= omething along >>> these lines to mitigate the problem. [...] > I can see "in the past" being useful to handle builds with time-bombs > that already slipped through the cracks My use-case is a researcher trying to redo in the future of 5 years some computations from a published (3 years ago) article providing some channels.scm and manifest.scm files. In this use-case, this researcher often runs Guix on the top of some GNU/Linux distro and probably on some shared machine in some University. Last, I envision for my use-case that the Guix infrastructure ecosystem would not be there to run this =E2=80=9Coffloading service=E2=80=9D. Other= wise, it appears to me far easier to just store the current substitutes =E2=80=93 or= say part of the current substitutes. >> Wording aside :-) What do Reproducible Builds for that? Because >> time-bomb seems similar as timestamp=E2=80=A6 > > At least for https://tests.reproducible-builds.org/debian on > amd64/x86_64, I think one of the builds runs approximately 1 year, 1 > month and 1 day in the future (+397 days?), which pretty much maximizes > the chance of a difference in year, month or day, while sommewhat > minimizing detection of time bombs... Since we are somehow building (at least) twice (Bordeaux and Berlin), maybe we could exploit this fact and so build =E2=80=9Cin the future=E2=80= =9C. I mean, similarly as we are doing world-rebuild with core-updates cycles, we could do a feature branch with a different time (=E2=80=9Din the future=E2=80=9C) more or less around the release. Somehow, similarly as we= are tagging some packages with =E2=80=98non reproducible=E2=80=99, we could tag= the ones with =E2=80=99time bombs=E2=80=99. > For detecting time-bombs, I would guess you want to test even further > into the future, maybe 5-10 years or so. Much longer, and you are > getting pretty close to 2038, which is an extra-special set of timebombs > that will need to be addressed at some point! Yeah, 2038 is something [1]=E2=80=A6 1: Cheers, simon