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NixOS Reproducible Builds

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Report: https://reproducible.nixos.org Project progress: https://github.com/orgs/NixOS/projects/30110 Servers

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6 Aug 2025
@emilazy:matrix.orgemily hoping to get the build directory changed to something more distinguishable than /build on Linux too so that we can expand the existing tmpdir auditing hook to catch more of this 13:12:11
@emilazy:matrix.orgemily (and ideally get some entropy in there in future too, so that --rebuild can reliably detect reproducibility issues they cause on Linux and we don't have to deal with the use-mention problems of the scanner detecting a false leak from documentation that mentions a fixed path) 13:13:46
7 Aug 2025
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8 Aug 2025
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13 Aug 2025
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19 Aug 2025
@raboof:matrix.orgraboofhttps://github.com/NixOS/nixpkgs/issues/434930 seems like nice low-hanging fruit regression08:05:50
20 Aug 2025
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22 Aug 2025
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25 Aug 2025
@emilazy:matrix.orgemily Alyssa Ross: I remember you having reproducibility objections to PGO, so flagging up https://discourse.nixos.org/t/transparently-supporting-pgo-fdo-plo-optimized-builds/68420 03:17:10
@emilazy:matrix.orgemilythough unclear if there is going to be serious work on this or if it is just an ad for the crowdfunding platform…03:17:32
@raboof:matrix.orgraboofIt sounds like they're proposing to do the profiling on the users' machine, in which case reproducibility is less essential I suppose (and it could even be reproducible if they store the profiling data and use it as an input)06:11:32
@emilazy:matrix.orgemilyyeah, I don't know. "I believe the correct high-level model for NixOS is binary substitution. The derivation the users specifies does not change. The binary used to satisfy that specification changes." is pretty vague. not sure they understand the model06:12:27
@emilazy:matrix.orgemilysince of course injecting profiling data naturally changes the derivation06:12:38
@emilazy:matrix.orgemilybut maybe I am missing how it is meant to plug together06:12:56
@raboof:matrix.orgraboofI agree it reads like an LLM-generated ad ('obvious commercial significance, both for enthusiasts and “warehouse” applications'??)06:14:46
@raboof:matrix.orgraboofYeah that sounds confused as well06:15:00
@emilazy:matrix.orgemily

reading their crowdfunding website

Self-reinforcing thinking can be as alluring as the creation of infinite energy or matter without input. However, all valid forms of logic are built upon directed acyclic graphs, meaning trees of arguments that proceed only in one direction without ever circling back. It is valid to converge to the same points from different starting points or having taken alternate paths, but any circular logic is trivially invalid. In fact, the discovery of any new reasoning requires non-circularity as a means of escaping infinite cycles. We have rejected the use of circular acronyms as they encourage complex and baffling reasoning that evades scrutiny yet is trivially invalid once you encounter the recurrence.

fair enough

06:15:38
@pyrox:pyrox.devdish [Fox/It/She] they just slapped a bunch of smart-sounding words in a paragraph 🥴 14:13:09
@raboof:matrix.orgraboofstealing this as my new lorem ipsum tho14:28:17
29 Aug 2025
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4 Sep 2025
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6 Sep 2025
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8 Sep 2025
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9 Sep 2025
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10 Sep 2025
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14 Sep 2025
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15 Sep 2025
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