Remove old nix config.

default.nix

-{ pkgs ? import <nixpkgs> { }
-, hypothesisProfile ? null
-, collectCoverage ? false
-, testSuite ? null
-, trialArgs ? null
-, tahoe-lafs ? "1.14.0"
-}:
-let
-  tahoe-packages = {
-    "1.14.0"    = pkgs.python2Packages.tahoe-lafs-1_14;
-    "1.16.0rc1" = pkgs.python2Packages.callPackage ./nix/tahoe-lafs-1_16.nix { };
-  };
-  tahoe-lafs' = builtins.getAttr tahoe-lafs tahoe-packages;
-
-  pkgs' = pkgs.extend (import ./overlays.nix);
-  callPackage = pkgs'.python27Packages.callPackage;
-in
-callPackage ./zkapauthorizer.nix {
-  challenge-bypass-ristretto = callPackage ./python-challenge-bypass-ristretto.nix { };
-  inherit hypothesisProfile collectCoverage testSuite trialArgs;
-  tahoe-lafs = tahoe-lafs';
-}

nix/repo-1_16_0_rc1.nix

-{ fetchFromGitHub }:
-fetchFromGitHub {
-  owner = "fenn-cs";
-  repo = "tahoe-lafs";
-  rev = "f6a96ae3976ee21ad0376f7b6a22fc3d12110dce";
-  sha256 = "sha256:127z83c388mvxkz1qdjqdnlj5xgshyn5w5v40vda6mpyy7k9bpb4";
-}

nix/setup.cfg.patch

-diff --git a/setup.cfg b/setup.cfg
-index dfc49607..822ea8dd 100644
---- a/setup.cfg
-+++ b/setup.cfg
-@@ -40,5 +40,5 @@ install_requires =
-     # incompatible with Tahoe-LAFS'.  So duplicate them here (the ones that
-     # have been observed to cause problems).
-     Twisted[tls,conch]>=18.4.0
--    tahoe-lafs >=1.14, <1.17, !=1.15.*
-+    tahoe-lafs
-     treq
- 
- [versioneer]

nix/tahoe-lafs-1_16.nix

-{ callPackage }:
-let
-  repo = callPackage ./repo-1_16_0_rc1.nix { };
-  tahoe-lafs = callPackage "${repo}/nix" { };
-in
-  tahoe-lafs

overlays.nix

-self: super: {
-  ristretto = super.callPackage ./ristretto.nix { };
-
-  python27 = super.python27.override {
-    packageOverrides = python-self: python-super: {
-      # The newest typing is incompatible with the packaged version of
-      # Hypothesis.  Upgrading Hypothesis is like pulling on a loose thread in
-      # a sweater.  I pulled it as far as pytest where I found there was no
-      # upgrade route because pytest has dropped Python 2 support.
-      # Fortunately, downgrading typing ends up being fairly straightforward.
-      #
-      # For now.  This is, no doubt, a sign of things to come for the Python 2
-      # ecosystem - the early stages of a slow, painful death by the thousand
-      # cuts of incompatibilities between libraries with no maintained Python
-      # 2 support.
-      typing = python-self.callPackage ./typing.nix { };
-    };
-  };
-}

python-challenge-bypass-ristretto-repo.nix

-let
-  pkgs = import <nixpkgs> {};
-in
-  pkgs.fetchFromGitHub {
-    owner = "LeastAuthority";
-    repo = "python-challenge-bypass-ristretto";
-    rev = "f1a7cfab1a7f1bf8b3345c228c2183064889ad83";
-    sha256 = "12myak2jwaisljs7bmx1vydgd0fnxvkaisk4zsf0kshwxrlnyh3x";
-  }
\ No newline at end of file

python-challenge-bypass-ristretto.nix

-{ callPackage }:
-let
-  src = import ./python-challenge-bypass-ristretto-repo.nix;
-  python-challenge-bypass-ristretto = callPackage "${src}" { };
-in
-  python-challenge-bypass-ristretto.overrideAttrs (old: {
-    patches = [
-      ./remove-setuptools-scm.patch
-    ];
-  })

typing.nix

-{ lib, buildPythonPackage, fetchPypi, pythonOlder, isPy3k, isPyPy, python }:
-
-let
-  testDir = if isPy3k then "src" else "python2";
-
-in buildPythonPackage rec {
-  pname = "typing";
-  version = "3.6.6";
-
-  src = fetchPypi {
-    inherit pname version;
-    sha256 = "sha256:0ba9acs4awx15bf9v3nrs781msbd2nx826906nj6fqks2bvca9s0";
-  };
-
-  # Error for Python3.6: ImportError: cannot import name 'ann_module'
-  # See https://github.com/python/typing/pull/280
-  # Also, don't bother on PyPy: AssertionError: TypeError not raised
-  doCheck = pythonOlder "3.6" && !isPyPy;
-
-  checkPhase = ''
-    cd ${testDir}
-    ${python.interpreter} -m unittest discover
-  '';
-
-  meta = with lib; {
-    description = "Backport of typing module to Python versions older than 3.5";
-    homepage = https://docs.python.org/3/library/typing.html;
-    license = licenses.psfl;
-  };
-}

zkapauthorizer.nix

-{ lib
-, buildPythonPackage, sphinx, git
-, attrs, zope_interface, aniso8601, twisted, tahoe-lafs, challenge-bypass-ristretto, treq
-, fixtures, testtools, hypothesis, pyflakes, coverage
-, hypothesisProfile ? null
-, collectCoverage ? false
-, testSuite ? null
-, trialArgs ? null
-}:
-let
-  hypothesisProfile' = if hypothesisProfile == null then "default" else hypothesisProfile;
-  testSuite' = if testSuite == null then "_zkapauthorizer" else testSuite;
-  defaultTrialArgs = [ "--rterrors" ] ++ ( lib.optional ( ! collectCoverage ) "--jobs=$NIX_BUILD_CORES" );
-  trialArgs' = if trialArgs == null then defaultTrialArgs else trialArgs;
-  extraTrialArgs = builtins.concatStringsSep " " trialArgs';
-in
-buildPythonPackage rec {
-  version = "0.0";
-  pname = "zero-knowledge-access-pass-authorizer";
-  name = "${pname}-${version}";
-  src = ./.;
-
-  outputs = [ "out" ] ++ (if collectCoverage then [ "doc" ] else [ ]);
-
-  depsBuildBuild = [
-    git
-    sphinx
-  ];
-
-  patches = [
-    # Remove the Tahoe-LAFS version pin in distutils config.  We have our own
-    # pinning and also our Tahoe-LAFS package has a bogus version number. :/
-    ./nix/setup.cfg.patch
-  ];
-
-  propagatedBuildInputs = [
-    aniso8601
-    tahoe-lafs
-    challenge-bypass-ristretto
-
-    # Inherit some things from tahoe-lafs to avoid conflicting versions
-    #
-    # attrs
-    # zope_interface
-    # twisted
-    # eliot
-    # treq
-  ];
-
-  checkInputs = [
-    coverage
-    fixtures
-    testtools
-    hypothesis
-  ];
-
-  checkPhase = ''
-    runHook preCheck
-    "${pyflakes}/bin/pyflakes" src/_zkapauthorizer
-    ZKAPAUTHORIZER_HYPOTHESIS_PROFILE=${hypothesisProfile'} python -m ${if collectCoverage
-      then "coverage run --debug=config --module"
-      else ""
-    } twisted.trial ${extraTrialArgs} ${testSuite'}
-    runHook postCheck
-  '';
-
-  postCheck = if collectCoverage
-    then ''
-    mkdir -p "$doc/share/doc/${name}"
-    cp -v .coverage.* "$doc/share/doc/${name}"
-    ''
-    else "";
-}