nixos-config/nix/sources.nix

# 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 =
      spec.ref
      or (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_${name} is set, then use
  # the path directly as opposed to the fetched source.
  replace = name: drv: let
    saneName = stringAsChars (c:
      if ((builtins.match "[a-zA-Z0-9]" c) == null)
      then "_"
      else c)
    name;
    ersatz = builtins.getEnv "NIV_OVERRIDE_${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 (name != null) {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 (name != null) {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 (sourcesFile == null)
      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);}