libs.nix

   1 let nixpkgs_unstable = import (builtins.fetchTarball {
   2   # FIXME: upgrade to nixpkgs 19 when stable and stick to stable
   3   # versions
   4   name = "nixos-unstable-2018-12-08";
   5   url = https://github.com/nixos/nixpkgs/archive/61c3169a0e17d789c566d5b241bfe309ce4a6275.tar.gz;
   6   sha256 = "0qbycg7wkb71v20rchlkafrjfpbk2fnlvvbh3ai9pyfisci5wxvq";
   7 }) {};
   8 in
   9   with nixpkgs_unstable;
  10 {
  11   inherit nixpkgs_unstable;
  12   fetchedGithub = path:
  13     let
  14       json = lib.importJSON path;
  15     in rec {
  16       version = json.tag;
  17       name = "${json.meta.name}-${version}";
  18       src = fetchFromGitHub json.github;
  19     };
  20
  21   fetchedGit = path:
  22     let
  23       json = lib.importJSON path;
  24     in rec {
  25       version = json.tag;
  26       name = "${json.meta.name}-${version}";
  27       src = fetchgit json.git;
  28     };
  29
  30   fetchedGitPrivate = path:
  31     let
  32       json = lib.importJSON path;
  33     in rec {
  34       version = json.tag;
  35       name = "${json.meta.name}-${version}";
  36       src = fetchgitPrivate json.git;
  37     };
  38
  39   checkEnv = var: builtins.stringLength (builtins.getEnv var) > 0;
  40
  41   wrap = { paths ? [], vars ? {}, file ? null, script ? null, name ? "wrap" }:
  42     assert file != null || script != null ||
  43       abort "wrap needs 'file' or 'script' argument";
  44     with rec {
  45       set  = n: v: "--set ${pkgs.lib.escapeShellArg n} " +
  46                     "${pkgs.lib.escapeShellArg v}";
  47       args = (map (p: "--prefix PATH : ${p}/bin") paths) ++
  48             (builtins.attrValues (pkgs.lib.mapAttrs set vars));
  49     };
  50     runCommand name
  51       {
  52         f           = if file == null then writeScript name script else file;
  53         buildInputs = [ makeWrapper ];
  54       }
  55       ''
  56         makeWrapper "$f" "$out" ${toString args}
  57       '';
  58 }