Source cleanup

- Change license to BSD-3-clause
- Update to recent pypi2nix and nixpkgs 17.03
- Switch from buildout.cfg/versions.cfg to requirements.txt
- Remove some cruft

LICENSE

@@ -0,0 +1,26 @@
+Copyright (c) 2017 Flying Circus Internet Operations GmbH. All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+1. Redistributions of source code must retain the above copyright notice, this
+list of conditions and the following disclaimer.
+
+2. Redistributions in binary form must reproduce the above copyright notice,
+this list of conditions and the following disclaimer in the documentation
+and/or other materials provided with the distribution.
+
+3. Neither the name of the copyright holder nor the names of its contributors
+may be used to endorse or promote products derived from this software without
+specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

default.nix

@@ -1,7 +1,11 @@
-{ pkgs ? import (builtins.fetchTarball "https://d3g5gsiof5omrk.cloudfront.net/nixos/16.09/nixos-16.09.1324.1dd0fb6/nixexprs.tar.xz") {}
-}:
+{ pkgs ? import <nixpkgs> { } }:
+
+with pkgs.lib;
 
 let
+  # generate requirements.nix with
+  # bin/pip freeze | egrep -v 'vulnix|pkg-resources' > requirements.txt
+  # pypi2nix -V 3.5 -E libxml2 -E libxslt -r requirements.txt
   python = import ./requirements.nix { inherit pkgs; };
   version = pkgs.lib.removeSuffix "\n" (builtins.readFile ./VERSION);
 
@@ -17,7 +21,7 @@ python.mkDerivation {
   buildInputs = [
     python.packages."flake8"
     python.packages."pytest"
-    python.packages."pytest-capturelog"
+    python.packages."pytest-catchlog"
     python.packages."pytest-codecheckers"
     python.packages."pytest-cov"
     python.packages."pytest-timeout"
@@ -42,6 +46,6 @@ python.mkDerivation {
   meta = {
     description = "NixOS vulnerability scanner";
     homepage = https://github.com/flyingcircusio/vulnix;
-    license = pkgs.lib.licenses.bsd2;
+    license = pkgs.lib.licenses.bsd3;
   };
 }