mio-ops/nix/sources.nix

# This file has been generated by Niv.
let
  #
  # The fetchers. fetch_<type> fetches specs of type <type>.
  #
  fetch_file = pkgs: spec:
    if spec.builtin or true
    then builtins_fetchurl {inherit (spec) url sha256;}
    else pkgs.fetchurl {inherit (spec) url sha256;};

  fetch_tarball = pkgs: spec:
    if spec.builtin or true
    then builtins_fetchTarball {inherit (spec) url sha256;}
    else pkgs.fetchzip {inherit (spec) url sha256;};

  fetch_git = spec:
    builtins.fetchGit {
      url = spec.repo;
      inherit (spec) rev ref;
    };

  fetch_builtin-tarball = spec:
    builtins.trace ''
      WARNING:
        The niv type "builtin-tarball" will soon be deprecated. You should
        instead use `builtin = true`.

        $ niv modify <package> -a type=tarball -a builtin=true
    ''
    builtins_fetchTarball {inherit (spec) url sha256;};

  fetch_builtin-url = spec:
    builtins.trace ''
      WARNING:
        The niv type "builtin-url" will soon be deprecated. You should
        instead use `builtin = true`.

        $ niv modify <package> -a type=file -a builtin=true
    '' (builtins_fetchurl {inherit (spec) url sha256;});

  #
  # Various helpers
  #

  # The set of packages used when specs are fetched using non-builtins.
  mkPkgs = sources: let
    sourcesNixpkgs =
      import (builtins_fetchTarball {inherit (sources.nixpkgs) url sha256;})
      {};
    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 spec
    else if spec.type == "tarball"
    then fetch_tarball pkgs spec
    else if spec.type == "git"
    then fetch_git spec
    else if spec.type == "builtin-tarball"
    then fetch_builtin-tarball spec
    else if spec.type == "builtin-url"
    then fetch_builtin-url spec
    else
      abort
      "ERROR: niv spec ${name} has unknown type ${builtins.toJSON spec.type}";

  # 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)));

  # fetchTarball version that is compatible between all the versions of Nix
  builtins_fetchTarball = {
    url,
    sha256,
  } @ attrs: let
    inherit (builtins) lessThan nixVersion fetchTarball;
  in
    if lessThan nixVersion "1.12"
    then fetchTarball {inherit url;}
    else fetchTarball attrs;

  # fetchurl version that is compatible between all the versions of Nix
  builtins_fetchurl = {
    url,
    sha256,
  } @ attrs: let
    inherit (builtins) lessThan nixVersion fetchurl;
  in
    if lessThan nixVersion "1.12"
    then fetchurl {inherit url;}
    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 = fetch config.pkgs name spec;})
    config.sources;

  # The "config" used by the fetchers
  mkConfig = {
    sourcesFile ? ./sources.json,
    sources ? builtins.fromJSON (builtins.readFile sourcesFile),
    pkgs ? mkPkgs sources,
  }: 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);
  }