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NixOS Reproducible Builds

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12 Feb 2025
@pveierland:matrix.orgpveierland
In reply to @mschwaig:matrix.org

If you want to associate a computation with its outcome, but not run the computation yourself, you always need to rely on some metadata for that association.

That's not only true for the kind of compression you describe, but also for the build steps themselves, even with content-addressed derivations in Nix.

It does seem to change certain thing however, as e.g. binary caches now store NARs with file names based on the hash of the compressed NAR, as the contents of the stored file will be different based on the compression used. If a deterministic compression was used, different caches would store the same files for the same payload data, making it possible to have consistent file names and contents, which could simplify some syncing and lookups
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