diff --git a/krebs/3modules/bepasty-server.nix b/krebs/3modules/bepasty-server.nix
index 0f00cd381..94a509520 100644
--- a/krebs/3modules/bepasty-server.nix
+++ b/krebs/3modules/bepasty-server.nix
@@ -2,10 +2,10 @@
 
 with import <stockholm/lib>;
 let
-  gunicorn = pkgs.python3Packages.gunicorn;
-  bepasty = pkgs.bepasty;
-  gevent = pkgs.python3Packages.gevent;
-  python = pkgs.python3Packages.python;
+  gunicorn = pkgs.python27Packages.gunicorn;
+  bepasty = pkgs.bepasty.override { python3Packages = pkgs.python27Packages; };
+  gevent = pkgs.python27Packages.gevent;
+  python = pkgs.python27Packages.python;
   cfg = config.krebs.bepasty;
 
   out = {
diff --git a/krebs/3modules/ci.nix b/krebs/3modules/ci.nix
index a47dbe611..244de1a0d 100644
--- a/krebs/3modules/ci.nix
+++ b/krebs/3modules/ci.nix
@@ -108,10 +108,12 @@ let
                         name=str(new_step),
                         command=[
                           "${pkgs.writeDash "build-stepper.sh" ''
-                            set -efu
+                            set -xefu
                             profile=${shell.escape profileRoot}/$build_name
                             result=$("$build_script")
-                            ${pkgs.nix}/bin/nix-env -p "$profile" --set "$result"
+                            if [ -n "$result" ]; then
+                              ${pkgs.nix}/bin/nix-env -p "$profile" --set "$result"
+                            fi
                           ''}"
                         ],
                         env={
diff --git a/lass/1systems/blue/config.nix b/lass/1systems/blue/config.nix
index a287f548b..43c80d52f 100644
--- a/lass/1systems/blue/config.nix
+++ b/lass/1systems/blue/config.nix
@@ -15,9 +15,11 @@ with import <stockholm/lib>;
 
   krebs.syncthing.folders = [
     { id = "contacts"; path = "/home/lass/contacts"; peers = [ "mors" "blue" "green" "phone" ]; }
+    { path = "/home/lass/.weechat"; peers = [ "blue" "green" "mors" ]; }
   ];
   lass.ensure-permissions = [
     { folder = "/home/lass/contacts"; owner = "lass"; group = "syncthing"; }
+    { folder = "/home/lass/.weechat"; owner = "lass"; group = "syncthing"; }
   ];
 
   environment.shellAliases = {
diff --git a/lass/1systems/mors/config.nix b/lass/1systems/mors/config.nix
index fa5fb5518..52bcc9e15 100644
--- a/lass/1systems/mors/config.nix
+++ b/lass/1systems/mors/config.nix
@@ -52,10 +52,12 @@ with import <stockholm/lib>;
       krebs.syncthing.folders = [
         { id = "contacts"; path = "/home/lass/contacts"; peers = [ "mors" "blue" "green" "phone" ]; }
         { id = "the_playlist"; path = "/home/lass/tmp/the_playlist"; peers = [ "mors" "phone" ]; }
+        { path = "/home/lass/.weechat"; peers = [ "blue" "green" "mors" ]; }
       ];
       lass.ensure-permissions = [
         { folder = "/home/lass/contacts"; owner = "lass"; group = "syncthing"; }
         { folder = "/home/lass/tmp/the_playlist"; owner = "lass"; group = "syncthing"; }
+        { folder = "/home/lass/.weechat"; owner = "lass"; group = "syncthing"; }
       ];
     }
     {
diff --git a/lass/2configs/hw/x220.nix b/lass/2configs/hw/x220.nix
index f5651da13..5649041f9 100644
--- a/lass/2configs/hw/x220.nix
+++ b/lass/2configs/hw/x220.nix
@@ -30,8 +30,7 @@
     };
   };
 
-  services.logind.extraConfig = ''
-    HandleLidSwitch=ignore
-  '';
+  services.logind.lidSwitch = "ignore";
+  services.logind.lidSwitchDocked = "ignore";
 
 }
diff --git a/lass/2configs/syncthing.nix b/lass/2configs/syncthing.nix
index 842abc195..d8b3c9f90 100644
--- a/lass/2configs/syncthing.nix
+++ b/lass/2configs/syncthing.nix
@@ -4,6 +4,7 @@ with import <stockholm/lib>;
   services.syncthing = {
     enable = true;
     group = "syncthing";
+    configDir = "/var/lib/syncthing";
   };
   krebs.iptables.tables.filter.INPUT.rules = [
     { predicate = "-p tcp --dport 22000"; target = "ACCEPT";}
diff --git a/lass/3modules/usershadow.nix b/lass/3modules/usershadow.nix
index cb2890969..d967a108a 100644
--- a/lass/3modules/usershadow.nix
+++ b/lass/3modules/usershadow.nix
@@ -31,13 +31,20 @@
       session required pam_loginuid.so
     '';
 
-    security.pam.services.dovecot2.text = ''
-      auth required pam_exec.so expose_authtok ${usershadow}/bin/verify_pam ${cfg.pattern}
-      auth required pam_permit.so
-      account required pam_permit.so
-      session required pam_permit.so
-      session required pam_env.so envfile=${config.system.build.pamEnvironment}
-    '';
+    security.pam.services.dovecot2 = {
+      text = ''
+        auth required pam_exec.so debug expose_authtok log=/tmp/lol /run/wrappers/bin/shadow_verify_pam ${cfg.pattern}
+        auth required pam_permit.so
+        account required pam_permit.so
+        session required pam_permit.so
+        session required pam_env.so envfile=${config.system.build.pamEnvironment}
+      '';
+    };
+
+    security.wrappers.shadow_verify_pam = {
+      source = "${usershadow}/bin/verify_pam";
+      owner = "root";
+    };
   };
 
   usershadow = let {
@@ -46,10 +53,13 @@
       "bytestring"
     ];
     body = pkgs.writeHaskellPackage "passwords" {
+      ghc-options = [
+        "-rtsopts"
+        "-Wall"
+      ];
       executables.verify_pam = {
         extra-depends = deps;
         text = ''
-          import Data.Monoid
           import System.IO
           import Data.Char (chr)
           import System.Environment (getEnv, getArgs)
@@ -72,7 +82,6 @@
       executables.verify_arg = {
         extra-depends = deps;
         text = ''
-          import Data.Monoid
           import System.Environment (getArgs)
           import Crypto.PasswordStore (verifyPasswordWith, pbkdf2)
           import qualified Data.ByteString.Char8 as BS8
diff --git a/makefu/5pkgs/nixpkgs-pytools/default.nix b/makefu/5pkgs/nixpkgs-pytools/default.nix
new file mode 100644
index 000000000..35146d155
--- /dev/null
+++ b/makefu/5pkgs/nixpkgs-pytools/default.nix
@@ -0,0 +1,17 @@
+{pkgs, fetchFromGitHub}:
+with pkgs.python3.pkgs;
+
+buildPythonPackage rec {
+  pname = "nixpkgs-pytools";
+  version = "1.0.0-dev";
+  src = fetchFromGitHub {
+    owner = "nix-community";
+    repo = pname;
+    rev = "593443b5689333cad3b6fa5b42e96587df68b0f8";
+    sha256 = "1cjpngr1rn5q59a1krgmpq2qm96wbiirc8yf1xmm21p3mskb2db4";
+  };
+  propagatedBuildInputs = [
+    jinja2 setuptools
+  ];
+  checkInputs = [ black ];
+}
diff --git a/makefu/krops.nix b/makefu/krops.nix
index 7c3fbcf4a..219e00d72 100644
--- a/makefu/krops.nix
+++ b/makefu/krops.nix
@@ -1,6 +1,6 @@
 { config ? config, name, target ? name }: let
   krops = ../submodules/krops;
-  nixpkgs-src = lib.importJSON ./nixpkgs.json;
+  nixpkgs-src = lib.importJSON ../krebs/nixpkgs.json;
 
   lib = import "${krops}/lib";
   pkgs = import "${krops}/pkgs" {};
@@ -20,10 +20,6 @@
   } // import (./. + "/1systems/${name}/source.nix");
   source = { test }: lib.evalSource [
     {
-      # nixos-18.09 @ 2018-09-18
-      # + uhub/sqlite: 5dd7610401747
-      # + hovercraft: 7134801b17d72
-      # + PR#53934:   eac6797380af1
       nixpkgs = if host-src.arm6 then {
         # TODO: we want to track the unstable channel
         symlink = "/nix/var/nix/profiles/per-user/root/channels/nixos/";
@@ -31,7 +27,7 @@
         derivation = ''
           with import <nixpkgs> {};
           pkgs.fetchFromGitHub {
-            owner = "makefu";
+            owner = "nixos";
             repo = "nixpkgs";
             rev = "${nixpkgs-src.rev}";
             sha256 = "${nixpkgs-src.sha256}";