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    # This file has been generated by Niv.
    
    let
    
      #
      # The fetchers. fetch_<type> fetches specs of type <type>.
      #
    
      fetch_file = pkgs: name: spec:
        let
          name' = sanitizeName name + "-src";
        in
          if spec.builtin or true then
            builtins_fetchurl { inherit (spec) url sha256; name = name'; }
          else
            pkgs.fetchurl { inherit (spec) url sha256; name = name'; };
    
      fetch_tarball = pkgs: name: spec:
        let
          name' = sanitizeName name + "-src";
        in
          if spec.builtin or true then
            builtins_fetchTarball { name = name'; inherit (spec) url sha256; }
          else
            pkgs.fetchzip { name = name'; inherit (spec) url sha256; };
    
      fetch_git = name: spec:
        let
          ref =
            if spec ? ref then spec.ref else
              if spec ? branch then "refs/heads/${spec.branch}" else
                if spec ? tag then "refs/tags/${spec.tag}" else
                  abort "In git source '${name}': Please specify `ref`, `tag` or `branch`!";
        in
          builtins.fetchGit { url = spec.repo; inherit (spec) rev; inherit ref; };
    
      fetch_local = spec: spec.path;
    
      fetch_builtin-tarball = name: throw
        ''[${name}] The niv type "builtin-tarball" is deprecated. You should instead use `builtin = true`.
            $ niv modify ${name} -a type=tarball -a builtin=true'';
    
      fetch_builtin-url = name: throw
        ''[${name}] The niv type "builtin-url" will soon be deprecated. You should instead use `builtin = true`.
            $ niv modify ${name} -a type=file -a builtin=true'';
    
      #
      # Various helpers
      #
    
      # https://github.com/NixOS/nixpkgs/pull/83241/files#diff-c6f540a4f3bfa4b0e8b6bafd4cd54e8bR695
      sanitizeName = name:
        (
          concatMapStrings (s: if builtins.isList s then "-" else s)
            (
              builtins.split "[^[:alnum:]+._?=-]+"
                ((x: builtins.elemAt (builtins.match "\\.*(.*)" x) 0) name)
            )
        );
    
      # The set of packages used when specs are fetched using non-builtins.
      mkPkgs = sources: system:
        let
          sourcesNixpkgs =
            import (builtins_fetchTarball { inherit (sources.nixpkgs) url sha256; }) { inherit system; };
          hasNixpkgsPath = builtins.any (x: x.prefix == "nixpkgs") builtins.nixPath;
          hasThisAsNixpkgsPath = <nixpkgs> == ./.;
        in
          if builtins.hasAttr "nixpkgs" sources
          then sourcesNixpkgs
          else if hasNixpkgsPath && ! hasThisAsNixpkgsPath then
            import <nixpkgs> {}
          else
            abort
              ''
                Please specify either <nixpkgs> (through -I or NIX_PATH=nixpkgs=...) or
                add a package called "nixpkgs" to your sources.json.
              '';
    
      # The actual fetching function.
      fetch = pkgs: name: spec:
    
        if ! builtins.hasAttr "type" spec then
          abort "ERROR: niv spec ${name} does not have a 'type' attribute"
        else if spec.type == "file" then fetch_file pkgs name spec
        else if spec.type == "tarball" then fetch_tarball pkgs name spec
        else if spec.type == "git" then fetch_git name spec
        else if spec.type == "local" then fetch_local spec
        else if spec.type == "builtin-tarball" then fetch_builtin-tarball name
        else if spec.type == "builtin-url" then fetch_builtin-url name
        else
          abort "ERROR: niv spec ${name} has unknown type ${builtins.toJSON spec.type}";
    
      # If the environment variable NIV_OVERRIDE_${name} is set, then use
      # the path directly as opposed to the fetched source.
      replace = name: drv:
        let
          saneName = stringAsChars (c: if isNull (builtins.match "[a-zA-Z0-9]" c) then "_" else c) name;
          ersatz = builtins.getEnv "NIV_OVERRIDE_${saneName}";
        in
          if ersatz == "" then drv else
            # this turns the string into an actual Nix path (for both absolute and
            # relative paths)
            if builtins.substring 0 1 ersatz == "/" then /. + ersatz else /. + builtins.getEnv "PWD" + "/${ersatz}";
    
      # Ports of functions for older nix versions
    
      # a Nix version of mapAttrs if the built-in doesn't exist
      mapAttrs = builtins.mapAttrs or (
        f: set: with builtins;
        listToAttrs (map (attr: { name = attr; value = f attr set.${attr}; }) (attrNames set))
      );
    
      # https://github.com/NixOS/nixpkgs/blob/0258808f5744ca980b9a1f24fe0b1e6f0fecee9c/lib/lists.nix#L295
      range = first: last: if first > last then [] else builtins.genList (n: first + n) (last - first + 1);
    
      # https://github.com/NixOS/nixpkgs/blob/0258808f5744ca980b9a1f24fe0b1e6f0fecee9c/lib/strings.nix#L257
      stringToCharacters = s: map (p: builtins.substring p 1 s) (range 0 (builtins.stringLength s - 1));
    
      # https://github.com/NixOS/nixpkgs/blob/0258808f5744ca980b9a1f24fe0b1e6f0fecee9c/lib/strings.nix#L269
      stringAsChars = f: s: concatStrings (map f (stringToCharacters s));
      concatMapStrings = f: list: concatStrings (map f list);
      concatStrings = builtins.concatStringsSep "";
    
      # https://github.com/NixOS/nixpkgs/blob/8a9f58a375c401b96da862d969f66429def1d118/lib/attrsets.nix#L331
      optionalAttrs = cond: as: if cond then as else {};
    
      # fetchTarball version that is compatible between all the versions of Nix
      builtins_fetchTarball = { url, name ? null, sha256 }@attrs:
        let
          inherit (builtins) lessThan nixVersion fetchTarball;
        in
          if lessThan nixVersion "1.12" then
            fetchTarball ({ inherit url; } // (optionalAttrs (!isNull name) { inherit name; }))
          else
            fetchTarball attrs;
    
      # fetchurl version that is compatible between all the versions of Nix
      builtins_fetchurl = { url, name ? null, sha256 }@attrs:
        let
          inherit (builtins) lessThan nixVersion fetchurl;
        in
          if lessThan nixVersion "1.12" then
            fetchurl ({ inherit url; } // (optionalAttrs (!isNull name) { inherit name; }))
          else
            fetchurl attrs;
    
      # Create the final "sources" from the config
      mkSources = config:
        mapAttrs (
          name: spec:
            if builtins.hasAttr "outPath" spec
            then abort
              "The values in sources.json should not have an 'outPath' attribute"
            else
              spec // { outPath = replace name (fetch config.pkgs name spec); }
        ) config.sources;
    
      # The "config" used by the fetchers
      mkConfig =
        { sourcesFile ? if builtins.pathExists ./sources.json then ./sources.json else null
        , sources ? if isNull sourcesFile then {} else builtins.fromJSON (builtins.readFile sourcesFile)
        , system ? builtins.currentSystem
        , pkgs ? mkPkgs sources system
        }: rec {
          # The sources, i.e. the attribute set of spec name to spec
          inherit sources;
    
          # The "pkgs" (evaluated nixpkgs) to use for e.g. non-builtin fetchers
          inherit pkgs;
        };
    
    in
    mkSources (mkConfig {}) // { __functor = _: settings: mkSources (mkConfig settings); }