Merge branch 'master' of pnp:stockholm

18 files changed, 284 insertions, 90 deletions

diff --git a/krebs/3modules/build.nix b/krebs/3modules/build.nix
index 57495ea6..1205e192 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/current.nix b/krebs/3modules/current.nix
new file mode 100644
index 00000000..41941e28
--- /dev/null
+++ b/krebs/3modules/current.nix
@@ -0,0 +1,26 @@
+{ config, pkgs, lib, ... }:
+
+with lib;
+
+let
+  cfg = config.krebs.current;
+
+  out = {
+    options.krebs.current = api;
+    config = mkIf cfg.enable imp;
+  };
+
+  api = {
+    enable = mkEnableOption "krebs.current";
+    host = mkOption {
+      type = types.host;
+    };
+    user = mkOption {
+      type = types.user;
+    };
+  };
+
+  imp = {
+  };
+
+in out
diff --git a/krebs/3modules/default.nix b/krebs/3modules/default.nix
index 075db182..fd9d56ed 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;
 
@@ -8,6 +8,7 @@ let
     imports = [
       ./bepasty-server.nix
       ./build.nix
+      ./current.nix
       ./exim-retiolum.nix
       ./exim-smarthost.nix
       ./github-hosts-sync.nix
@@ -76,6 +77,7 @@ let
   imp = mkMerge [
     { krebs = import ./lass { inherit lib; }; }
     { krebs = import ./makefu { inherit lib; }; }
+    { krebs = import ./shared { inherit lib; }; }
     { krebs = import ./tv { inherit lib; }; }
     {
       krebs.dns.providers = {
@@ -105,8 +107,8 @@ let
 
       # Implements environment.etc."zones/<zone-name>"
       environment.etc = let
-        stripEmptyLines = s: concatStringsSep "\n"
-          (remove "\n" (remove "" (splitString "\n" s)));
+        stripEmptyLines = s: (concatStringsSep "\n"
+          (remove "\n" (remove "" (splitString "\n" s)))) + "\n";
         all-zones = foldAttrs (sum: current: sum + "\n" +current ) ""
           ([cfg.zone-head-config] ++ combined-hosts);
         combined-hosts = (mapAttrsToList (name: value: value.extraZones)  cfg.hosts );
diff --git a/krebs/3modules/git.nix b/krebs/3modules/git.nix
index 64b7820b..23412949 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 2a1df9e0..5503ee8d 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 afedf95f..498282b0 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 bc0d389f..e36a083f 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 {
@@ -185,6 +185,7 @@ with import ../../4lib { inherit lib; };
           addrs6 = ["42:6e1e:cc8a:7cef:827:f938:8c64:baad"];
           aliases = [
             "graphs.wry.retiolum"
+            "graphs.retiolum"
             "paste.wry.retiolum"
             "paste.retiolum"
             "wry.retiolum"
diff --git a/krebs/3modules/shared/default.nix b/krebs/3modules/shared/default.nix
new file mode 100644
index 00000000..24dd7b78
--- /dev/null
+++ b/krebs/3modules/shared/default.nix
@@ -0,0 +1,42 @@
+{ lib, ... }:
+
+with lib;
+
+{
+  hosts = addNames {
+    wolf = {
+      #dc = "shack";
+      nets = {
+        #shack = {
+        #  addrs4 = [ TODO ];
+        #  aliases = ["wolf.shack"];
+        #};
+        retiolum = {
+          addrs4 = ["10.243.77.1"];
+          addrs6 = ["42:0:0:0:0:0:77:1"];
+          aliases = [
+            "wolf.retiolum"
+          ];
+          tinc.pubkey = ''
+            -----BEGIN RSA PUBLIC KEY-----
+            MIIBCgKCAQEAzpXyEATt8+ElxPq650/fkboEC9RvTWqN6UIAl/R4Zu+uDhAZ2ekb
+            HBjoSbRxu/0w2I37nwWUhEOemxGm4PXCgWrtO0jeRF4nVNYu3ZBppA3vuVALUWq7
+            apxRUEL9FdsWQlXGo4PVd20dGaDTi8M/Ggo755MStVTY0rRLluxyPq6VAa015sNg
+            4NOFuWm0NDn4e+qrahTCTiSjbCU8rWixm0GktV40kdg0QAiFbEcRhuXF1s9/yojk
+            7JT/nFg6LELjWUSSNZnioj5oSfVbThDRelIld9VaAKBAZZ5/zy6T2XSeDfoepytH
+            8aw6itEuTCy1M1DTiTG+12SPPw+ubG+NqQIDAQAB
+            -----END RSA PUBLIC KEY-----
+          '';
+        };
+      };
+      ssh.privkey.path = <secrets/ssh.id_ed25519>;
+      ssh.pubkey = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIKYMXMWZIK0jjnZDM9INiYAKcwjXs2241vew54K8veCR";
+    };
+  };
+  users = addNames {
+    shared = {
+      mail = "spam@krebsco.de";
+      pubkey = "lol"; # TODO krebs.users.shared.pubkey should be unnecessary
+    };
+  };
+}
diff --git a/krebs/3modules/tinc_graphs.nix b/krebs/3modules/tinc_graphs.nix
index a6c62835..e415d20a 100644
--- a/krebs/3modules/tinc_graphs.nix
+++ b/krebs/3modules/tinc_graphs.nix
@@ -95,8 +95,12 @@ let
 
         ExecStartPre = pkgs.writeScript "tinc_graphs-init" ''
           #!/bin/sh
+          mkdir -p "${internal_dir}" "${external_dir}"
           if ! test -e "${cfg.workingDir}/internal/index.html"; then
-            cp -fr "$(${pkgs.tinc_graphs}/bin/tincstats-static-dir)/internal/" "${internal_dir}"
+            cp -fr "$(${pkgs.tinc_graphs}/bin/tincstats-static-dir)/internal/." "${internal_dir}"
+          fi
+          if ! test -e "${cfg.workingDir}/external/index.html"; then
+            cp -fr "$(${pkgs.tinc_graphs}/bin/tincstats-static-dir)/external/." "${external_dir}"
           fi
         '';
 
@@ -118,7 +122,6 @@ let
     users.extraUsers.tinc_graphs = {
       uid = 3925439960; #genid tinc_graphs
       home = "/var/spool/tinc_graphs";
-      createHome = true;
     };
 
     krebs.nginx.servers = mkIf cfg.nginx.enable {
diff --git a/krebs/3modules/tv/default.nix b/krebs/3modules/tv/default.nix
index 5d5fead8..4c295dff 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/3modules/urlwatch.nix b/krebs/3modules/urlwatch.nix
index 80d9f5e9..206bc569 100644
--- a/krebs/3modules/urlwatch.nix
+++ b/krebs/3modules/urlwatch.nix
@@ -56,6 +56,13 @@ let
         https://nixos.org/channels/nixos-unstable/git-revision
       ];
     };
+    verbose = mkOption {
+      type = types.bool;
+      default = false;
+      description = ''
+        verbose output of urlwatch
+      '';
+    };
   };
 
   urlsFile = toFile "urls" (concatStringsSep "\n" cfg.urls);
@@ -106,7 +113,7 @@ let
 
           cd /tmp
 
-          urlwatch -e --urls="$urlsFile" > changes 2>&1 || :
+          urlwatch -e ${optionalString cfg.verbose "-v"} --urls="$urlsFile" > changes || :
 
           if test -s changes; then
             date=$(date -R)
diff --git a/krebs/4lib/default.nix b/krebs/4lib/default.nix
index 0a610131..396307c2 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 0039960c..94b13e0b 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 9fbd5be8..94c9b0fb 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 84fb8725..7df7b7d3 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;
@@ -55,4 +54,8 @@ subdirs // rec {
     gcc -O -Wall -o "$exe" $src
     strip --strip-unneeded "$exe"
   '';
+
+  writeNixFromCabal = name: path: pkgs.runCommand name {} ''
+    ${pkgs.cabal2nix}/bin/cabal2nix ${path} > $out
+  '';
 }
diff --git a/krebs/5pkgs/tinc_graphs/default.nix b/krebs/5pkgs/tinc_graphs/default.nix
new file mode 100644
index 00000000..e5f1e40e
--- /dev/null
+++ b/krebs/5pkgs/tinc_graphs/default.nix
@@ -0,0 +1,26 @@
+{stdenv,fetchurl,pkgs,python3Packages, ... }:
+
+python3Packages.buildPythonPackage rec {
+  name = "tinc_graphs-${version}";
+  version = "0.3.9";
+  propagatedBuildInputs = with pkgs;[
+    python3Packages.pygeoip
+    ## ${geolite-legacy}/share/GeoIP/GeoIPCity.dat
+  ];
+  src = fetchurl {
+    url = "https://pypi.python.org/packages/source/t/tinc_graphs/tinc_graphs-${version}.tar.gz";
+    sha256 = "0hjmkiclvyjb3707285x4b8mk5aqjcvh383hvkad1h7p1n61qrfx";
+  };
+  preFixup = with pkgs;''
+    wrapProgram $out/bin/build-graphs --prefix PATH : "$out/bin"
+    wrapProgram $out/bin/all-the-graphs --prefix PATH : "${imagemagick}/bin:${graphviz}/bin:$out/bin"
+    wrapProgram $out/bin/tinc-stats2json --prefix PATH : "${tinc}/bin"
+  '';
+
+  meta = {
+    homepage = http://krebsco.de/;
+    description = "Create Graphs from Tinc Stats";
+    license = stdenv.lib.licenses.wtfpl;
+  };
+}
+
diff --git a/krebs/Zhosts/wolf b/krebs/Zhosts/wolf
new file mode 100644
index 00000000..ded8275b
--- /dev/null
+++ b/krebs/Zhosts/wolf
@@ -0,0 +1,10 @@
+Subnet = 10.243.77.1/32
+Subnet = 42:0:0:0:0:0:77:1/128
+-----BEGIN RSA PUBLIC KEY-----
+MIIBCgKCAQEAzpXyEATt8+ElxPq650/fkboEC9RvTWqN6UIAl/R4Zu+uDhAZ2ekb
+HBjoSbRxu/0w2I37nwWUhEOemxGm4PXCgWrtO0jeRF4nVNYu3ZBppA3vuVALUWq7
+apxRUEL9FdsWQlXGo4PVd20dGaDTi8M/Ggo755MStVTY0rRLluxyPq6VAa015sNg
+4NOFuWm0NDn4e+qrahTCTiSjbCU8rWixm0GktV40kdg0QAiFbEcRhuXF1s9/yojk
+7JT/nFg6LELjWUSSNZnioj5oSfVbThDRelIld9VaAKBAZZ5/zy6T2XSeDfoepytH
+8aw6itEuTCy1M1DTiTG+12SPPw+ubG+NqQIDAQAB
+-----END RSA PUBLIC KEY-----
diff --git a/krebs/default.nix b/krebs/default.nix
index c23cf152..31a7f7d0 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}
     ''}";