📝Nix flakes

tags
Nix
source

  • Nix is good at packing software but historically is bad at packing nix expressions.
  • Nix flakes is a standardized way to distribute nix expressions.
  • All nix flakes use hermetic evaluation: they cannot access any source of impurities:

    • they don’t accept arguments
    • cannot accept environment variables
    • cannot access arbitrary filesystem locations
    • cannot fetchgit/fetchurl without specifying rev or sha
  • A flake has some meta information, inputs (other flakes), and outputs (packages, nixos modules, hydra configurations)

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