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NixOS Reproducible Builds

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Report: https://reproducible.nixos.org Project progress: https://github.com/orgs/NixOS/projects/30133 Servers

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28 Apr 2026
@implr:hackerspace.plimplrHi, I wrote in #users earlier but it got buried under a different discussion. I have a coreutils build failing tests, but only under nix on Gentoo. On nixos it builds fine. The kernel is of course different, but that shouldn't affect that test as far as I can tell08:18:45
@implr:hackerspace.plimplr it's nix-build -E '(import <nixpkgs> {}).pkgs.coreutils.override { singleBinary = false; }' (with the channel pointing to the same commit, but it doesn't seem to matter anyway, old versions still fail) 08:18:56
@implr:hackerspace.plimplr curiously, on Gentoo nix-shell <derivation>; genericBuild; checkPhase also passes, so idk how do i even debug this 08:19:54
29 Apr 2026
@implr:hackerspace.plimplrfor posterity, this is an issue with how the gentoo packaging of nix builds its sandbox busybox: https://github.com/trofi/nix-guix-gentoo/blob/master/sys-apps/busybox-nix-sandbox-shell/busybox-nix-sandbox-shell-1.36.1.ebuild#L105 is different from the nixos one21:37:26
30 Apr 2026
@raboof:matrix.orgraboofOh wow. Good find06:23:07
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2 May 2026
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8 May 2026
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10 May 2026
@emilazy:matrix.orgemilyhttps://lists.debian.org/debian-devel-announce/2026/05/msg00001.html16:08:52
@emilazy:matrix.orgemilyAided by the efforts of the Reproducible Builds project [1], we've decided it's time to say that Debian must ship reproducible packages. Since yesterday, we have enabled our migration software to block migration of new packages that can't be reproduced [2] or existing packages (in testing) that regress in reproducibility.16:09:03
@raboof:matrix.orgraboofSomething to aspire to!17:18:23
13 May 2026
@ethancedwards8:matrix.orgethancedwards8hmmm16:59:17
@ethancedwards8:matrix.orgethancedwards8this has me thinking 16:59:20
@ethancedwards8:matrix.orgethancedwards8is there a way to make nixpkgs-review report on if a package is reproducible or not? maybe this is something we want to start looking at in reviews17:00:01
@drupol:matrix.orgPolExcellent idea :) but that would probably slow down the review. I don't mind actually, it's a great idea.17:48:55
@gsaurel:laas.frnim65sThat would basically require building stuff x4 I guess ?20:13:06
@ethancedwards8:matrix.orgethancedwards8why 4x? 21:42:59
@ethancedwards8:matrix.orgethancedwards8i thought just 2x? 21:43:05
@ethancedwards8:matrix.orgethancedwards8this should probably just be opt-in21:43:20
@ethancedwards8:matrix.orgethancedwards8i'll think about this and try to work on it this weekend (7 hours flight ahead of me :( )21:43:47
14 May 2026
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15 May 2026
@siraben:matrix.orgsiraben (he/him)could always start with a threshold of (reproduce if rebuild takes <15m)00:15:22
@siraben:matrix.orgsiraben (he/him) * could always start with a threshold of (reproduce if rebuild takes <30m) 00:15:35
18 May 2026
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19 May 2026
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20 May 2026
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22 May 2026
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