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Honest question: is NixOS really doing reproducible builds, where you get byte-identical binaries when rebuilding from source?

I only found this issue on the Tor tracker, and apparently NixOS does not produce reproducible builds in the same way as intended by Debian: https://trac.torproject.org/projects/tor/ticket/12520

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The aim is to have such reproducible builds, for example builds are always performed with the system clock set to 1 second after the Unix epoch. The reality varies from package to package; reproducibility problems are counted as bugs, but as always there's a cost/benefit decisions about fixing them.

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