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NixOS Reproducible Builds

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Report: https://reproducible.nixos.org Project progress: https://github.com/orgs/NixOS/projects/30105 Servers

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26 Aug 2024
@emilazy:matrix.orgemilythe "minimum supported version of the platform"02:34:04
@emilazy:matrix.orgemilyrather than Python stuff having to figure it out02:34:15
@qyliss:fairydust.spaceAlyssa RossWe have a fake uname package08:31:48
@qyliss:fairydust.spaceAlyssa RossAlthough I think here setting it to linuxHeaders.version probably makes sense.08:32:15
@emilazy:matrix.orgemilywhat does that one output? :)14:10:54
@emilazy:matrix.orgemilywe should align them in any case14:10:58
@emilazy:matrix.orgemily and add a fake sw_vers to match, that came up recently 14:11:04
@qyliss:fairydust.spaceAlyssa RossI don't know. tbh I'm not a fan.14:27:44
@emilazy:matrix.orgemilybecause you'd prefer to patch stuff?14:28:01
@qyliss:fairydust.spaceAlyssa Rossyeah14:28:24
@emilazy:matrix.orgemily adisbladis: fwiw apparently macOS already scrubs this info for Python https://matrix.to/#/!lheuhImcToQZYTQTuI:nixos.org/$d2JnDxYdhDRsYkHK84BfURKIr4LVjWNiKHAdjVHrmNo?via=nixos.org&via=matrix.org&via=nixos.dev 14:30:11
@emilazy:matrix.orgemilyand it has caused a few issues, so be aware if you follow suit14:30:19
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27 Aug 2024
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4 Sep 2024
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5 Sep 2024
@msanft:matrix.orgMoritz SanftJust to confirm for a talk: At some point, the minimal ISO was reproducible, right?14:11:57
@raboof:matrix.orgraboofyes (https://discourse.nixos.org/t/nixos-reproducible-builds-minimal-installation-iso-successfully-independently-rebuilt/34756) - AFAIK it still is, but I'll admit I haven't tried since June14:13:23
@emilazy:matrix.orgemily I thought jfsutils was scuppering it 14:13:42
@raboof:matrix.orgraboofyes and no: we have a strong indication that jfsutils sometimes produces a different output (https://github.com/NixOS/nixpkgs/issues/276433), but it's rare enough that I have never actually ran into that when trying to reproduce the ISO14:17:06
@raboof:matrix.orgraboofso we're tracking it and want to fix it to avoid false negatives, but it didn't prevent us from reproducing the ISO so far14:18:09
@raboof:matrix.orgraboof(aka worst-case the issue would cause us not to trust a build that was actually safe, it will never cause us to trust a build that was actually unsafe)14:21:03
@emilazy:matrix.orgemilymaybe I should get around to removing JFS to help you out :)14:21:15
@emilazy:matrix.orgemilyhttps://github.com/NixOS/nixpkgs/pull/33982115:01:31
@emilazy:matrix.orgemilymerry christmas15:01:33
@philiptaron:matrix.orgPhilip Taron (UTC-8)I merged it.18:30:22
@emilazy:matrix.orgemilyI've noticed lately that the key to getting things merged in Nixpkgs is to have a PR message of approximately 5 times the length of the diff18:31:41
@philiptaron:matrix.orgPhilip Taron (UTC-8)It does help that it reads like a motion made with careful forethought and background. In this case, it was actually an anime gif from the release manager that sealed the deal.18:33:51
@kamillaova:matrix.orgKamilla 'ova
In reply to @raboof:matrix.org
yes and no: we have a strong indication that jfsutils sometimes produces a different output (https://github.com/NixOS/nixpkgs/issues/276433), but it's rare enough that I have never actually ran into that when trying to reproduce the ISO

by the way, this problem is most likely caused by the gnu&llvm strip bug, since I can't reproduce this very strange output with dontStrip = true (after 1000+ rebuilds, with dontStrip = false it fails to reproduce under ~300 rebuilds)

and this is the end, my strength was not enough for further debugging :(

20:04:39
@kamillaova:matrix.orgKamilla 'ovaand I was able to reproduce this only in the nix build sandbox, but I did't try to reproduce this with genericBuild under the jfsutils's nix-shell20:07:55
@emilazy:matrix.orgemilythank you for your work on it :)20:08:47

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