the basics

nix/default.nix

@@ -0,0 +1,4 @@
+{ pkgs ? import <nixpkgs> { } }:
+pkgs.python2.pkgs.callPackage ./tahoe-lafs.nix {
+  eliot = (pkgs.python2.pkgs.callPackage ./eliot.nix { });
+}

nix/eliot.nix

@@ -0,0 +1,27 @@
+{ lib, buildPythonPackage, fetchPypi, zope_interface, pyrsistent, boltons
+, hypothesis, testtools, pytest }:
+buildPythonPackage rec {
+  pname = "eliot";
+  version = "1.7.0";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "0ylyycf717s5qsrx8b9n6m38vyj2k8328lfhn8y6r31824991wv8";
+  };
+
+  postPatch = ''
+    substituteInPlace setup.py \
+      --replace "boltons >= 19.0.1" boltons
+    # depends on eliot.prettyprint._main which we don't have here.
+    rm eliot/tests/test_prettyprint.py
+  '';
+
+  checkInputs = [ testtools pytest hypothesis ];
+  propagatedBuildInputs = [ zope_interface pyrsistent boltons ];
+
+  meta = with lib; {
+    homepage = https://github.com/itamarst/eliot/;
+    description = "Logging library that tells you why it happened";
+    license = licenses.asl20;
+  };
+}

nix/tahoe-lafs.nix

@@ -0,0 +1,49 @@
+{ fetchFromGitHub, nettools, python
+, twisted, foolscap, nevow, zfec
+, setuptools, setuptoolsTrial, pyasn1, zope_interface
+, service-identity, pyyaml, magic-wormhole, treq, appdirs
+, beautifulsoup4, eliot, autobahn, cryptography
+}:
+python.pkgs.buildPythonPackage rec {
+  version = "1.14.0.dev";
+  name = "tahoe-lafs-${version}";
+  # src = fetchFromGitHub {
+  #   owner = "LeastAuthority";
+  #   repo = "tahoe-lafs";
+  #   # HEAD of an integration branch for all of the storage plugin stuff.  Last
+  #   # updated October 4 2019.
+  #   rev = "8c1f536ba4fbc01f3bc5f08412edbefc56ff7037";
+  #   sha256 = "17d7pkbsgss3rhqf7ac7ylzbddi555rnkzz48zjqwq1zx1z2jhy6";
+  # };
+  src = ~/Work/python/tahoe-lafs;
+
+  postPatch = ''
+    sed -i "src/allmydata/util/iputil.py" \
+        -es"|_linux_path = '/sbin/ifconfig'|_linux_path = '${nettools}/bin/ifconfig'|g"
+
+    # Chroots don't have /etc/hosts and /etc/resolv.conf, so work around
+    # that.
+    for i in $(find src/allmydata/test -type f)
+    do
+      sed -i "$i" -e"s/localhost/127.0.0.1/g"
+    done
+  '';
+
+
+  propagatedBuildInputs = with python.pkgs; [
+    twisted foolscap nevow zfec appdirs
+    setuptoolsTrial pyasn1 zope_interface
+    service-identity pyyaml magic-wormhole treq
+    beautifulsoup4 eliot autobahn cryptography setuptools
+  ];
+
+  checkInputs = with python.pkgs; [
+    hypothesis
+    testtools
+    fixtures
+  ];
+
+  checkPhase = ''
+    ${python}/bin/python -m twisted.trial -j4 allmydata
+  '';
+}