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NixOS Reproducible Builds

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Report: https://reproducible.nixos.org Project progress: https://github.com/orgs/NixOS/projects/30124 Servers

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6 Aug 2025
@emilazy:matrix.orgemily Linux's current use of a fixed namespaced build directory masks reproducibility issues that surface on Darwin due to the lack of working chroot there. the leaks are also often just upstream or packaging bugs when they're not benign ones we can remap away like __FILE__ 13:09:48
@emilazy:matrix.orgemilyI'm working on a fix for an unrelated Darwin build directory issue that involves injecting more entropy into the paths than we already do, so I'm preemptively building a bunch of stuff and fixing leaks that were happening on Linux too13:11:04
@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

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