nix-bitcoin/pkgs/nixpkgs-pinned.nix

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Nix
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let
fetchNixpkgs = { rev, sha256 }:
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builtins.fetchTarball {
url = "https://github.com/nixos/nixpkgs/archive/${rev}.tar.gz";
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inherit sha256;
};
fetch = input: let
inherit (input) locked;
in fetchNixpkgs {
inherit (locked) rev;
sha256 = locked.narHash;
};
lockedInputs = (builtins.fromJSON (builtins.readFile ../flake.lock)).nodes;
in
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{
nixpkgs = fetch lockedInputs.nixpkgs;
nixpkgs-unstable = fetch lockedInputs.nixpkgs-unstable;
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}