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NixOS Reproducible Builds

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Report: https://reproducible.nixos.org Project progress: https://github.com/orgs/NixOS/projects/30128 Servers

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3 Jun 2021
@baloo_:matrix.orgbalooso I'm confused15:11:12
@baloo_:matrix.orgbalooraboof: iirc 1980 is also the timestamp 0 for zip files15:14:05
@raboof:matrix.orgraboofyeah.. (the zip files with this firmware seem to have different timestamps though)15:14:43
@raboof:matrix.orgraboof I'm building with `nix-build nixos/release-combined.nix -A nixos.iso_minimal.x86_64-linux --option substitute false --arg nixpkgs "{ revCount = 292082; shortRev = "3a2e0c36e79"; rev = "3a2e0c36e79cecaf196cbea23e75e74710140ea4" }" --arg stableBranch true 15:18:23
@baloo_:matrix.orgbaloohaaaa15:18:34
@raboof:matrix.orgraboof * I'm building with nix-build nixos/release-combined.nix -A nixos.iso_minimal.x86_64-linux --option substitute false --arg nixpkgs "{ revCount = 292082; shortRev = "3a2e0c36e79"; rev = "3a2e0c36e79cecaf196cbea23e75e74710140ea4" }" --arg stableBranch true 15:18:37
@baloo_:matrix.orgbaloothat explains things15:18:47
4 Jun 2021
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6 Jun 2021
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7 Jun 2021
@raboof:matrix.orgraboofstumped by https://github.com/NixOS/nixpkgs/issues/125380. could it be somebody did some manual thing on a hydra machine that messed up the date? (I don't know how hydra machines work :D )15:57:45
@ninjatrappeur:matrix.orgNinjaTrappeur cc lukegb (he/him) ^ 20:38:25
@lukegb:zxcvbnm.ninjalukegb (he/him) ¯_(ツ)_/¯ 20:40:30
@lukegb:zxcvbnm.ninjalukegb (he/him) * ¯\(ツ)20:40:34
@lukegb:zxcvbnm.ninjalukegb (he/him) * ¯\_(ツ)_/¯ 20:40:40
@ninjatrappeur:matrix.orgNinjaTrappeurMy bad, I remember seeing you fiddle around the images generation on Hydra with Graham a few weeks ago.20:41:22
@lukegb:zxcvbnm.ninjalukegb (he/him)Hahaha, yeah, I mostly meant... that's weird20:41:32
@ninjatrappeur:matrix.orgNinjaTrappeurit is :/20:41:45
@lukegb:zxcvbnm.ninjalukegb (he/him)Does it repeatedly happen on subsequent ISOs, or was it a oneoff20:44:29
8 Jun 2021
@raboof:matrix.orgraboofRedacted or Malformed Event07:04:06
@raboof:matrix.orgraboof
In reply to @lukegb:zxcvbnm.ninja
Does it repeatedly happen on subsequent ISOs, or was it a oneoff
it seems it happens repeatedly on the 21.05 and nixos-unstable iso's, but not on the 20.09 ones (even recently built ones...)
07:04:44
@lukegb:zxcvbnm.ninjalukegb (he/him)iiiinteresting13:10:19
@lukegb:zxcvbnm.ninjalukegb (he/him)

I guess my follow-up questions include:

  • does Hydra generate the same ISO each time
  • do local Nix invocations generate the same ISO each time
13:11:10
@raboof:matrix.orgraboof
In reply to @lukegb:zxcvbnm.ninja

I guess my follow-up questions include:

  • does Hydra generate the same ISO each time
  • do local Nix invocations generate the same ISO each time
Does Hydra ever build from the same git commit twice? Different git commits will produce different ISO's of course. Building the same ISO on two different local machines almost produces the same contents (but the differences don't seem related to timestamps)
15:13:58
@lukegb:zxcvbnm.ninjalukegb (he/him)Yeah, trying to convince Hydra to build it again would be hard15:14:12
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11 Jun 2021
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