Merge remote-tracking branch 'cloudkrebs/master'

41 files changed, 751 insertions, 270 deletions

diff --git a/default.nix b/default.nix
index 11bae7d98..b261e51e7 100644
--- a/default.nix
+++ b/default.nix
@@ -17,7 +17,8 @@
 { current-date ? abort "current-date not defined"
 , current-host-name ? abort "current-host-name not defined"
 , current-user-name ? builtins.getEnv "LOGNAME"
-}@current:
+, StrictHostKeyChecking ? "yes"
+}@args:
 
 let stockholm = {
     # The generated scripts to deploy (or infest) systems can be found in the
@@ -44,11 +45,25 @@ let stockholm = {
     # Additionally, output lib and pkgs for easy access from the shell.
     # Notice how we're evaluating just the base module to obtain pkgs.
     inherit lib;
-    inherit (eval {}) pkgs;
+    inherit pkgs;
   };
 
-  krebs = import ./krebs (current // { inherit stockholm; });
-  inherit (krebs) lib;
+  krebs = import ./krebs (args // { inherit lib stockholm; });
+
+  lib =
+    let
+      lib = import <nixpkgs/lib>;
+      klib = import ./krebs/4lib { inherit lib; };
+      #ulib = import (./. + "/${current-user-name}/4lib") { lib = lib // klib; };
+      ulib = {}; # TODO
+    in
+    builtins // lib // klib // ulib // rec {
+      # TODO move this stuff
+      stockholm-path = ./.;
+      nspath = ns: p: stockholm-path + "/${ns}/${p}";
+    };
+
+  inherit (eval {}) pkgs;
 
   # Path resolvers for common and individual files.
   # Example: `upath "3modules"` produces the current user's 3modules directory
@@ -65,8 +80,8 @@ let stockholm = {
       let
         # Notice the ordering.  Krebs packages can only depend on Nixpkgs,
         # whereas user packages additionally can depend on krebs packages.
-        kpkgs = import (kpath "5pkgs") { inherit pkgs; };
-        upkgs = import (upath "5pkgs") { pkgs = pkgs // kpkgs; };
+        kpkgs = import (kpath "5pkgs") { inherit lib pkgs; };
+        upkgs = import (upath "5pkgs") { inherit lib; pkgs = pkgs // kpkgs; };
       in
       kpkgs // upkgs;
   };
@@ -76,8 +91,10 @@ let stockholm = {
   # packages and modules on top of NixOS.  Some of this stuff might become
   # useful to a broader audience, at which point it should probably be merged
   # and pull-requested for inclusion into NixOS/nixpkgs.
-  # TODO provide krebs lib, so modules don't have to import it awkwardly
   eval = config: import <nixpkgs/nixos/lib/eval-config.nix> {
+    specialArgs = {
+      inherit lib;
+    };
     modules = [
       base-module
       config
diff --git a/krebs/3modules/build.nix b/krebs/3modules/build.nix
index 57495ea69..1205e192b 100644
--- a/krebs/3modules/build.nix
+++ b/krebs/3modules/build.nix
@@ -1,6 +1,6 @@
 { config, lib, ... }:
 
-with import ../4lib { inherit lib; };
+with lib;
 
 let
   target = config.krebs.build // { user.name = "root"; };
diff --git a/krebs/3modules/default.nix b/krebs/3modules/default.nix
index bc858f668..e0c3b00f8 100644
--- a/krebs/3modules/default.nix
+++ b/krebs/3modules/default.nix
@@ -1,6 +1,6 @@
 { config, lib, ... }:
 
-with import ../4lib { inherit lib; };
+with lib;
 let
   cfg = config.krebs;
 
diff --git a/krebs/3modules/git.nix b/krebs/3modules/git.nix
index 64b7820b2..234129497 100644
--- a/krebs/3modules/git.nix
+++ b/krebs/3modules/git.nix
@@ -6,7 +6,7 @@
 # TODO when authorized_keys changes, then restart ssh
 #       (or kill already connected users somehow)
 
-with import ../4lib { inherit lib; };
+with lib;
 let
   cfg = config.krebs.git;
 
diff --git a/krebs/3modules/github-hosts-sync.nix b/krebs/3modules/github-hosts-sync.nix
index 2a1df9e03..5503ee8d6 100644
--- a/krebs/3modules/github-hosts-sync.nix
+++ b/krebs/3modules/github-hosts-sync.nix
@@ -1,7 +1,6 @@
 { config, lib, pkgs, ... }:
 
-with builtins;
-with import ../4lib { inherit lib; };
+with lib;
 let
   cfg = config.krebs.github-hosts-sync;
 
diff --git a/krebs/3modules/lass/default.nix b/krebs/3modules/lass/default.nix
index afedf95f2..498282b03 100644
--- a/krebs/3modules/lass/default.nix
+++ b/krebs/3modules/lass/default.nix
@@ -1,8 +1,36 @@
 { lib, ... }:
 
-with import ../../4lib { inherit lib; };
+with lib;
 
-{
+let
+  testHosts = lib.genAttrs [
+    "test-arch"
+    "test-centos6"
+    "test-centos7"
+  ] (name: {
+    inherit name;
+    cores = 1;
+    nets = {
+      retiolum = {
+        addrs4 = ["10.243.111.111"];
+        addrs6 = ["42:0:0:0:0:0:0:7357"];
+        aliases = [
+          "test.retiolum"
+        ];
+        tinc.pubkey = ''
+          -----BEGIN RSA PUBLIC KEY-----
+          MIIBCgKCAQEAy41YKF/wpHLnN370MSdnAo63QUW30aw+6O79cnaJyxoL6ZQkk4Nd
+          mrX2tBIfb2hhhgm4Jecy33WVymoEL7EiRZ6gshJaYwte51Jnrac6IFQyiRGMqHY5
+          TG/6IzzTOkeQrT1fw3Yfh0NRfqLBZLr0nAFoqgzIVRxvy+QO1gCU2UDKkQ/y5df1
+          K+YsMipxU08dsOkPkmLdC/+vDaZiEdYljIS3Omd+ED5JmLM3MSs/ZPQ8xjkjEAy8
+          QqD9/67bDoeXyg1ZxED2n0+aRKtU/CK/66Li//yev6yv38OQSEM4t/V0dr9sjLcY
+          VIdkxKf96F9r3vcDf/9xw2HrqVoy+D5XYQIDAQAB
+          -----END RSA PUBLIC KEY-----
+        '';
+      };
+    };
+  });
+in {
   hosts = addNames {
     echelon = {
       cores = 4;
@@ -104,7 +132,11 @@ with import ../../4lib { inherit lib; };
     uriel = {
       cores = 1;
       dc = "lass";
-      nets = rec {
+      nets = {
+        gg23 = {
+          addrs4 = ["10.23.1.12"];
+          aliases = ["uriel.gg23"];
+        };
         retiolum = {
           addrs4 = ["10.243.81.176"];
           addrs6 = ["42:dc25:60cf:94ef:759b:d2b6:98a9:2e56"];
@@ -131,7 +163,11 @@ with import ../../4lib { inherit lib; };
     mors = {
       cores = 2;
       dc = "lass";
-      nets = rec {
+      nets = {
+        gg23 = {
+          addrs4 = ["10.23.1.11"];
+          aliases = ["mors.gg23"];
+        };
         retiolum = {
           addrs4 = ["10.243.0.2"];
           addrs6 = ["42:0:0:0:0:0:0:dea7"];
@@ -155,8 +191,24 @@ with import ../../4lib { inherit lib; };
       ssh.privkey.path = <secrets/ssh.id_ed25519>;
       ssh.pubkey = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAINAMPlIG+6u75GJ3kvsPF6OoIZsU+u8ZQ+rdviv5fNMD";
     };
+    schnabel-ap = {
+      nets = {
+        gg23 = {
+          addrs4 = ["10.23.1.20"];
+          aliases = ["schnabel-ap.gg23"];
+        };
+      };
+    };
+    Reichsfunk-ap = {
+      nets = {
+        gg23 = {
+          addrs4 = ["10.23.1.10"];
+          aliases = ["Reichsfunk-ap.gg23"];
+        };
+      };
+    };
 
-  };
+  } // testHosts;
   users = addNames {
     lass = {
       pubkey = readFile ../../Zpubkeys/lass.ssh.pub;
diff --git a/krebs/3modules/makefu/default.nix b/krebs/3modules/makefu/default.nix
index bc0d389f2..d328033cc 100644
--- a/krebs/3modules/makefu/default.nix
+++ b/krebs/3modules/makefu/default.nix
@@ -1,6 +1,6 @@
 { lib, ... }:
 
-with import ../../4lib { inherit lib; };
+with lib;
 
 {
   hosts = addNames {
diff --git a/krebs/3modules/tv/default.nix b/krebs/3modules/tv/default.nix
index 5d5fead8f..4c295dffe 100644
--- a/krebs/3modules/tv/default.nix
+++ b/krebs/3modules/tv/default.nix
@@ -1,6 +1,6 @@
 { lib, ... }:
 
-with import ../../4lib { inherit lib; };
+with lib;
 
 {
   dns.providers = {
@@ -65,7 +65,7 @@ with import ../../4lib { inherit lib; };
       dc = "tv"; #dc = "cac";
       nets = rec {
         internet = {
-          addrs4 = ["104.233.84.215"];
+          addrs4 = ["104.167.114.142"];
           aliases = [
             "mkdir.internet"
           ];
@@ -231,6 +231,7 @@ with import ../../4lib { inherit lib; };
           addrs6 = ["42:0:0:0:0:0:0:1337"];
           aliases = [
             "wu.retiolum"
+            "cgit.wu.retiolum"
           ];
           tinc.pubkey = ''
             -----BEGIN RSA PUBLIC KEY-----
diff --git a/krebs/4lib/default.nix b/krebs/4lib/default.nix
index 0a6101314..396307c22 100644
--- a/krebs/4lib/default.nix
+++ b/krebs/4lib/default.nix
@@ -3,8 +3,6 @@
 with builtins;
 with lib;
 
-builtins //
-lib //
 rec {
 
   eq = x: y: x == y;
diff --git a/krebs/4lib/infest/finalize.sh b/krebs/4lib/infest/finalize.sh
index 0039960c5..94b13e0be 100644
--- a/krebs/4lib/infest/finalize.sh
+++ b/krebs/4lib/infest/finalize.sh
@@ -3,8 +3,8 @@ set -eux
 {
   umount /mnt/nix
   umount /mnt/root
-  umount /boot || :
   umount /mnt/boot
+  umount /boot || :
   umount /mnt
 
   coreutils_path=$(set +f; for i in /nix/store/*coreutils*/bin; do :; done; echo $i)
diff --git a/krebs/4lib/infest/prepare.sh b/krebs/4lib/infest/prepare.sh
index 9fbd5be86..94c9b0fb5 100644
--- a/krebs/4lib/infest/prepare.sh
+++ b/krebs/4lib/infest/prepare.sh
@@ -18,6 +18,13 @@ prepare() {(
         esac
         ;;
     esac
+  elif test -e /etc/centos-release; then
+    case $(cat /etc/centos-release) in
+      'CentOS release 6.5 (Final)')
+        prepare_centos "$@"
+        exit
+        ;;
+    esac
   fi
   echo "$0 prepare: unknown OS" >&2
   exit -1
diff --git a/krebs/5pkgs/default.nix b/krebs/5pkgs/default.nix
index 84fb8725b..0ec4b3ded 100644
--- a/krebs/5pkgs/default.nix
+++ b/krebs/5pkgs/default.nix
@@ -1,7 +1,6 @@
-{ pkgs, ... }:
-
-with import ../4lib { inherit (pkgs) lib; };
+{ lib, pkgs, ... }:
 
+with lib;
 let
   subdirs = mapAttrs (_: flip pkgs.callPackage {}) (subdirsOf ./.);
   pkgs' = pkgs // subdirs;
diff --git a/krebs/default.nix b/krebs/default.nix
index c23cf152a..31a7f7d04 100644
--- a/krebs/default.nix
+++ b/krebs/default.nix
@@ -1,14 +1,16 @@
 { current-date
 , current-host-name
 , current-user-name
+, lib
 , stockholm
+, StrictHostKeyChecking ? "yes"
 }:
 
 let out = {
     inherit deploy;
     inherit infest;
     inherit init;
-    inherit lib;
+    inherit nixos-install;
   };
 
   deploy =
@@ -23,7 +25,7 @@ let out = {
       set -efu
       (${populate args})
       ${rootssh target ''
-        ${install args}
+        ${nix-install args}
         ${config.krebs.build.profile}/bin/switch-to-configuration switch
       ''}
       echo OK
@@ -39,63 +41,14 @@ let out = {
       # krebs.infest
       set -efu
 
-      # XXX type -p is non-standard
-      #export RSYNC_RSH; RSYNC_RSH="$(type -p ssh) \
-      #  -o 'HostName $ {target.host.infest.addr}' \
-      #  -o 'Port $ {toString target.host.infest.port}' \
-      #"
-      #ssh() {
-      #  eval "$RSYNC_RSH \"\$@\""
-      #}
-
-      ${lib.rootssh target ''
+      ${rootssh target ''
         ${builtins.readFile ./4lib/infest/prepare.sh}
         ${builtins.readFile ./4lib/infest/install-nix.sh}
       ''}
 
-      (${lib.populate args})
-
-      ${lib.rootssh target ''
-        export PATH; PATH=/root/.nix-profile/bin:$PATH
-
-        src=$(type -p nixos-install)
-        cat_src() {
-          sed < "$src" "$(
-            { sed < "$src" -n '
-                  /^if ! test -e "\$mountPoint\/\$NIXOS_CONFIG/,/^fi$/=
-                  /^nixpkgs=/=
-                  /^NIX_PATH=/,/^$/{/./=}
-
-                  # Disable: Copy the NixOS/Nixpkgs sources to the target as
-                  # the initial contents of the NixOS channel.
-                  /^srcs=/,/^ln -sfn /=
-                '
-            } | sed 's:$:s/^/#krebs#/:'
-          )"
-        }
-
-        # Location to insert install
-        i=$(sed -n '/^echo "building the system configuration/=' "$src")
-
-        {
-          cat_src | sed -n "1,$i{p}"
-          cat ${lib.doc (install args)}
-          cat_src | sed -n "$i,\''${$i!p}"
-        } > nixos-install
-        chmod +x nixos-install
-
-        ## Wrap inserted install into chroot.
-        #nix_env=$(cat_src | sed -n '
-        #  s:.*\(/nix/store/[a-z0-9]*-nix-[0-9.]\+/bin/nix-env\).*:\1:p;T;q
-        #')
-        #echo nix-env is $nix_env
-        #sed -i '
-        #  s:^nix-env:chroot $mountPoint '"$nix_env"':
-        #' nixos-install
-
-        unset SSL_CERT_FILE
-        ./nixos-install
+      (${nixos-install args})
 
+      ${rootssh target ''
         ${builtins.readFile ./4lib/infest/finalize.sh}
       ''}
     '';
@@ -135,10 +88,74 @@ let out = {
       EOF
     '';
 
-  lib = import ./4lib { lib = import <nixpkgs/lib>; } // rec {
-    stockholm-path = ../.;
-    nspath = ns: p: stockholm-path + "/${ns}/${p}";
-  };
+  nixos-install =
+    { system ? current-host-name
+    , target ? system
+    }@args: let
+    in ''
+      #! /bin/sh
+      # ${current-date} ${current-user-name}@${current-host-name}
+      # krebs.nixos-install
+      (${populate args})
+
+      ${rootssh target ''
+        export PATH; PATH=/root/.nix-profile/bin:$PATH
+
+        src=$(type -p nixos-install)
+        cat_src() {
+          sed < "$src" "$(
+            { sed < "$src" -n '
+                  /^if ! test -e "\$mountPoint\/\$NIXOS_CONFIG/,/^fi$/=
+                  /^nixpkgs=/=
+                  /^NIX_PATH=/,/^$/{/./=}
+
+                  # Disable: Copy the NixOS/Nixpkgs sources to the target as
+                  # the initial contents of the NixOS channel.
+                  /^srcs=/,/^ln -sfn /=
+                '
+            } | sed 's:$:s/^/#krebs#/:'
+          )"
+        }
+
+        # Location to insert `nix-install`
+        i=$(sed -n '/^echo "building the system configuration/=' "$src")
+
+        {
+          cat_src | sed -n "1,$i{p}"
+          cat ${doc (nix-install args)}
+          cat_src | sed -n "$i,\''${$i!p}"
+        } > nixos-install
+        chmod +x nixos-install
+
+        # Wrap inserted nix-install into chroot.
+        nix_env=$(cat_src | sed -n '
+          s:.*\(/nix/store/[a-z0-9]*-nix-[0-9.]\+/bin/nix-env\).*:\1:p;T;q
+        ')
+        echo "nix-env is $nix_env" >&2
+        findpkg() {(
+          name=$1
+          path=$(find /nix/store \
+              -mindepth 1 -maxdepth 1 -type d -name '*-'"$name"'-*' \
+            | head -n 1 | sed s:^/mnt::)
+          if echo "$path" | grep .; then
+            echo "$name is $path" >&2
+          else
+            echo "Error: package not found: $name" >&2
+            exit 1
+          fi
+        )}
+        cacert=$(findpkg cacert)
+        coreutils=$(findpkg coreutils)
+        cp "$cacert"/etc/ssl/certs/ca-bundle.crt /mnt/root/SSL_CERT_FILE
+        env="$coreutils/bin/env SSL_CERT_FILE=/root/SSL_CERT_FILE"
+        sed -i '
+          s:^NIX_PATH=:chroot $mountPoint '"$env"' &:
+          s:^nix-env:'"$nix_env"':
+        ' nixos-install
+
+        ./nixos-install
+      ''}
+    '';
 
   doc = s:
     let b = "EOF${builtins.hashString "sha256" s}"; in
@@ -152,7 +169,7 @@ let out = {
     stockholm.users.${current-user-name}.${system}.config
       or (abort "unknown system: ${system}, user: ${current-user-name}");
 
-  install =
+  nix-install =
     { system ? current-host-name
     , target ? system
     }:
@@ -203,11 +220,8 @@ let out = {
       current-host = config.krebs.hosts.${current-host-name};
       current-user = config.krebs.users.${current-user-name};
 
-      target-host = config.krebs.hosts.${system};
-
       methods.dir = config:
         let
-          can-link = config.host.name == target-host.name;
           can-push = config.host.name == current-host.name;
           push-method = ''
             rsync \
@@ -221,11 +235,11 @@ let out = {
               ${config.path}/ \
               root@${target}:${config.target-path}
           '';
-          url = "file://${config.host.name}${config.path}";
         in
-        #if can-link then link-method else
         if can-push then push-method else
-        throw "cannot source ${url}";
+        let dir = "file://${config.host.name}${config.path}"; in
+        # /!\ revise this message when using more than just push-method
+        throw "No way to push ${dir} from ${current-host.name} to ${target}";
 
       methods.git = config:
         rootssh target ''
@@ -251,7 +265,10 @@ let out = {
     in out;
 
   rootssh = target: script:
-    "ssh root@${target} -T ${doc ''
+    let
+      flags = "-o StrictHostKeyChecking=${StrictHostKeyChecking}";
+    in
+    "ssh ${flags} root@${target} -T ${doc ''
       set -efu
       ${script}
     ''}";
diff --git a/lass/1systems/cloudkrebs.nix b/lass/1systems/cloudkrebs.nix
index 17915e087..ab24b584b 100644
--- a/lass/1systems/cloudkrebs.nix
+++ b/lass/1systems/cloudkrebs.nix
@@ -27,30 +27,9 @@ in {
 
     }
     {
-      nix.maxJobs = 1;
       sound.enable = false;
     }
   ];
 
-  krebs.build = {
-    user = config.krebs.users.lass;
-    host = config.krebs.hosts.cloudkrebs;
-    source = {
-      dir.secrets = {
-        host = config.krebs.hosts.mors;
-        path = "/home/lass/secrets/${config.krebs.build.host.name}";
-      };
-      dir.stockholm = {
-        host = config.krebs.hosts.mors;
-        path = "/home/lass/dev/stockholm";
-      };
-    };
-  };
-
-  networking.hostName = "cloudkrebs";
-
-  environment.systemPackages = [
-    pkgs.dic
-  ];
-
+  krebs.build.host = config.krebs.hosts.cloudkrebs;
 }
diff --git a/lass/1systems/echelon.nix b/lass/1systems/echelon.nix
index feaf77ef6..94c793b08 100644
--- a/lass/1systems/echelon.nix
+++ b/lass/1systems/echelon.nix
@@ -31,26 +31,23 @@ in {
 
     }
     {
-      nix.maxJobs = 1;
       sound.enable = false;
     }
-  ];
-
-  krebs.build = {
-    user = config.krebs.users.lass;
-    host = config.krebs.hosts.echelon;
-    source = {
-      dir.secrets = {
-        host = config.krebs.hosts.mors;
-        path = "/home/lass/secrets/${config.krebs.build.host.name}";
-      };
-      dir.stockholm = {
-        host = config.krebs.hosts.mors;
-        path = "/home/lass/dev/stockholm";
+    {
+      imports = [
+        ../3modules/dnsmasq.nix
+      ];
+      lass.dnsmasq = {
+        enable = true;
+        config = ''
+          interface=retiolum
+        '';
       };
-    };
-  };
-
-  networking.hostName = config.krebs.build.host.name;
+      krebs.iptables.tables.filter.INPUT.rules = [
+        { predicate = "-i retiolum -p udp --dport 53"; target = "ACCEPT"; }
+      ];
+    }
+  ];
 
+  krebs.build.host = config.krebs.hosts.echelon;
 }
diff --git a/lass/1systems/mors.nix b/lass/1systems/mors.nix
index 7076c8b14..b0b8ff573 100644
--- a/lass/1systems/mors.nix
+++ b/lass/1systems/mors.nix
@@ -2,7 +2,7 @@
 
 {
   imports = [
-    ../2configs/desktop-base.nix
+    ../2configs/baseX.nix
     ../2configs/programs.nix
     ../2configs/bitcoin.nix
     ../2configs/browsers.nix
@@ -10,7 +10,6 @@
     ../2configs/pass.nix
     ../2configs/virtualbox.nix
     ../2configs/elster.nix
-    ../2configs/urxvt.nix
     ../2configs/steam.nix
     ../2configs/wine.nix
     ../2configs/texlive.nix
@@ -18,7 +17,6 @@
     #../2configs/ircd.nix
     ../2configs/chromium-patched.nix
     ../2configs/git.nix
-    #../../2configs/tv/synaptics.nix
     ../2configs/retiolum.nix
     ../2configs/wordpress.nix
     ../2configs/bitlbee.nix
@@ -26,22 +24,8 @@
     ../2configs/skype.nix
   ];
 
-  krebs.build = {
-    user = config.krebs.users.lass;
-    host = config.krebs.hosts.mors;
-    source = {
-      dir.secrets = {
-        host = config.krebs.hosts.mors;
-        path = "/home/lass/secrets/${config.krebs.build.host.name}";
-      };
-      dir.stockholm = {
-        host = config.krebs.hosts.mors;
-        path = "/home/lass/dev/stockholm";
-      };
-    };
-  };
+  krebs.build.host = config.krebs.hosts.mors;
 
-  networking.hostName = "mors";
   networking.wireless.enable = true;
 
   networking.extraHosts = ''
@@ -52,8 +36,6 @@
     10.243.206.102 apanowicz.de
   '';
 
-  nix.maxJobs = 4;
-
   hardware.enableAllFirmware = true;
   nixpkgs.config.allowUnfree = true;
 
@@ -159,11 +141,6 @@
     emulateWheel = true;
   };
 
-  #system.activationScripts.trackpoint = ''
-  #  echo 0 > '/sys/devices/platform/i8042/serio1/serio2/speed'
-  #  echo 220 > '/sys/devices/platform/i8042/serio1/serio2/sensitivity'
-  #'';
-
   services.xserver = {
     videoDriver = "intel";
     vaapiDrivers = [ pkgs.vaapiIntel ];
@@ -210,9 +187,19 @@
       ];
     };
   };
+
   #touchpad config
   services.xserver.synaptics = {
     enable = true;
+    accelFactor = "0.035";
+    additionalOptions = ''
+      Option "FingerHigh" "60"
+      Option "FingerLow"  "60"
+    '';
     tapButtons = false;
+    twoFingerScroll = true;
   };
+
+  #for google hangout
+  users.extraUsers.gm.extraGroups = [ "audio" "video" ];
 }
diff --git a/lass/1systems/test-arch.nix b/lass/1systems/test-arch.nix
new file mode 100644
index 000000000..0ab9da2f3
--- /dev/null
+++ b/lass/1systems/test-arch.nix
@@ -0,0 +1,36 @@
+{ config, lib, pkgs, ... }:
+
+let
+  inherit (import ../4lib { inherit pkgs lib; }) getDefaultGateway;
+  inherit (lib) head;
+
+in {
+  imports = [
+    ../2configs/base.nix
+    {
+      boot.loader.grub = {
+        device = "/dev/sda";
+        splashImage = null;
+      };
+
+      boot.initrd.availableKernelModules = [
+        "ata_piix"
+        "vmw_pvscsi"
+      ];
+
+      fileSystems."/" = {
+        device = "/dev/sda1";
+      };
+    }
+    {
+      networking.dhcpcd.allowInterfaces = [
+        "enp*"
+      ];
+    }
+    {
+      sound.enable = false;
+    }
+  ];
+
+  krebs.build.host = config.krebs.hosts.test-arch;
+}
diff --git a/lass/1systems/test-centos6.nix b/lass/1systems/test-centos6.nix
new file mode 100644
index 000000000..7270c2262
--- /dev/null
+++ b/lass/1systems/test-centos6.nix
@@ -0,0 +1,30 @@
+{ config, lib, pkgs, ... }:
+
+let
+  inherit (import ../4lib { inherit pkgs lib; })