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NixOS Reproducible Builds

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Report: https://reproducible.nixos.org Project progress: https://github.com/orgs/NixOS/projects/30107 Servers

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12 May 2023
@julienmalka:matrix.orgJulienThanks16:05:23
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14 May 2023
@delroth:delroth.net@delroth:delroth.netI think there's a way to fix the Linux modules BTF reproducibility issue -- it looks like pahole (the thing that generates the .BTF section from DWARF info) uses multi-threading, and I suspect that's the cause of the unreproducibility (stuff gets processed in a ~random order). But 1. there's a pahole flag we could use (-j 1); 2. we could just patch pahole to not support that at all, or default the number of threads to 1 if e.g. SOURCE_DATE_EPOCH is defined, or similar.01:59:14
@delroth:delroth.net@delroth:delroth.netyep, ran a --check of linuxPackages.zfs with pahole patched to default to 1 thread, and it succeeded. could be a fluke, but that's promising (my run with no patch failed "as expected")02:06:59
@delroth:delroth.net@delroth:delroth.nethttps://github.com/NixOS/nixpkgs/pull/23176802:14:31
@delroth:delroth.net@delroth:delroth.netso uh, only Python left for the minimal iso? :)04:48:18
@sympt:matrix.orgsympt joined the room.07:32:45
@raboof:matrix.orgraboofI think so! Very curious to see how things will go in practice once the default is switched to python3.11, after the 23.05 branchoff09:18:16
@raitobezarius:matrix.orgraitobezariusI'd be curious to see what does it take to fix pahole to emit correctly in multi-threaded mode15:05:41
@bachp:matrix.orgPascal Bach joined the room.18:01:37

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