new.nix

let
  sources = import nix/sources.nix;
in
{ pkgs ? import sources.release2015 {}
, pypiData ? sources.pypi-deps-db
, mach-nix ? import sources.mach-nix { inherit pkgs pypiData; }
, tahoe-lafs ? "1.14.0"
}:
  let
    providers = {
      _default = "sdist,nixpkgs,wheel";
      tahoe-lafs = "nixpkgs";
      # not packaged in nixpkgs at all, we can use the binary wheel from
      # pypi though.
      python-challenge-bypass-ristretto = "wheel";
      # Pure python packages that don't build correctly from sdists
      # - patches in nixpkgs that don't apply
      # - missing build dependencies
      platformdirs = "wheel";
      boltons = "wheel";
      klein = "wheel";
      humanize = "wheel";
      chardet = "wheel";
      urllib3 = "wheel";
      zipp = "wheel";
    };
    tahoe-versions = {
      "1.14.0" = {
        requirements = builtins.readFile ./requirements/base.txt;
        overridesPre = [];
        _.tahoe-lafs.patches = [
          (
            pkgs.fetchpatch {
              url = "https://raw.githubusercontent.com/PrivateStorageio/nixpkgs/privatestorageio/pkgs/development/python-modules/tahoe-lafs/rsa-exponent.patch";
              sha256 = "sha256-0vIMj5gZPbKLkow6wpA+Tz7bpyy+mZRSSFGmpg0VMyk=";
            }
          )
        ];
      };
      "1.16.0rc1" = rec {
        requirements = builtins.readFile ./requirements/base-1.16.txt;
        _ = {};
        overridesPre = [
          (
            self: super: {
              tahoe-lafs = mach-nix.buildPythonPackage {
                python = "python27";
                pname = "tahoe-lafs";
                version = "1.16.0rc1";
                inherit providers;
                #inherit requirements providers;
                # See https://github.com/DavHau/mach-nix/issues/190
                requirementsExtra = ''
                  pyrsistent
                  foolscap == 0.13.1
                  configparser
                  eliot
                  '';
                postPatch = ''
                  cat > src/allmydata/_version.py <<EOF
                  # This _version.py is generated by nix.

                  verstr = "$version"
                  __version__ = verstr
                  EOF
                '';
                src = pkgs.fetchFromGitHub {
                  owner = "fenn-cs";
                  repo = "tahoe-lafs";
                  rev = "f6a96ae3976ee21ad0376f7b6a22fc3d12110dce";
                  sha256 = "ZN2V5vH+VqPaBmQXXqyH+vUiqW1YNhz+7LsiNNhA/4g=";
                };
              };
            }
          )
        ];
      };
    };
  in
    #    (builtins.elemAt tahoe-versions."1.16.0rc1".propagatedBuildInputs 0)
    #/*
    mach-nix.buildPythonApplication rec {
      python = "python27";
      name = "zero-knowledge-access-pass-authorizer";
      src = ./.;
      inherit providers;
      inherit (tahoe-versions.${tahoe-lafs}) requirements overridesPre _;
      format = "setuptools";
      # Record some settings here, so downstream nix files can consume them.
      meta.mach-nix = { inherit python providers; };
    }
/**/