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That's if you're installing from a channel, because channels get updated. If you use a local clone/submodule of nixpkgs (the git repository with the definition
by progval 6y ago
That's if you're installing from a channel, because channels get updated.
If you use a local clone/submodule of nixpkgs (the git repository with the definition of all nixos packages) at a specific commit, then you will always install the exact same software, because definitions in nixpkgs all specify the exact version and the hash of all the inputs.