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 =
        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