added overlay

.editorconfig

@@ -0,0 +1 @@
+nixpkgs/.editorconfig

configuration.nix

@@ -48,7 +48,11 @@ in {
   nix = {
     gc.automatic = true;
     gc.dates = "03:15";
-    nixPath = [ "/etc/nixos" "nixos-config=/etc/nixos/configuration.nix" ];
+    nixPath = [
+      "/etc/nixos"
+      "nixos-config=/etc/nixos/configuration.nix"
+      "nixpkgs-overlays=/etc/nixos/overlays"
+    ];
     package = pkgs.nixUnstable;
     extraOptions = ''
       gc-keep-outputs = true
@@ -125,12 +129,7 @@ in {
     journald.extraConfig = "SystemMaxUse=1G";
   };
 
-  #systemd.package = pkgs.systemd.overrideDerivation(old: {
-  #  src = builtins.fetchgit {
-  #    url = /home/joerg/git/systemd;
-  #    rev = "c87463cc115b1e4cf9771c0b0b5a9fa8b7ba1d8f";
-  #  };
-  #});
+  systemd.package = pkgs.mysystemd;
 
   powerManagement.powertop.enable = true;
 

network-configuration.nix

@@ -141,10 +141,6 @@ in {
   };
 
   systemd.network.enable = true;
-  systemd.services.systemd-networkd.serviceConfig.ExecStart = [
-    ""
-    "${pkgs.networkd}/bin/systemd-networkd"
-  ];
   systemd.network.netdevs = let
     wgTemplate = lport: name: endpoint: key: {
       netdevConfig = { Name = "wg-${name}"; Kind = "wireguard"; };

overlays/mypackages/default.nix

@@ -0,0 +1,72 @@
+self: super:
+
+{
+  hplip = super.hplip.override { withPlugin = true; };
+  #neovim = pkgs.neovim.override {
+  #  vimAlias = true;
+  #  extraPythonPackages = with python27Packages; [jedi];
+  #  #python3Packages = python36Packages;
+  #  extraPython3Packages = with python3Packages; [jedi requests2];
+  #};
+
+  mynix = super.nixUnstable.overrideDerivation (old: {
+    src = self.fetchFromGitHub {
+      owner = "NixOS";
+      repo = "nix";
+      rev = "a7e55151a8d45d987ca42ba318c44ed3ccdeecca";
+      sha256 = "0qnnc8wbh55j2mpnywvj22ajcqfcdfismxbgkix45hq4nm5lkb1j";
+    };
+    enableParallelBuilding = true;
+  });
+
+  mysystemd = super.systemd.overrideDerivation(old: {
+    src = self.fetchFromGitHub {
+      owner = "Mic92";
+      repo = "systemd";
+      rev = "17b7553d68519399c2fefc8bbed234f86a240992";
+      sha256 = "1gbi9aq1gq3il8256ffa2s4nyp26qzfyzsmvyr0kqfdmxb9pjj39";
+    };
+    preConfigure = old.preConfigure + ''
+      substituteInPlace src/network/networkd-manager.c \
+        --replace /usr/lib/systemd/network $out/lib/systemd/network
+    '';
+  });
+
+  networkd = super.stdenv.mkDerivation {
+    name = "systemd-networkd";
+    buildInputs = with self; [
+      linuxHeaders pkgconfig intltool gperf libcap kmod
+      xz pam acl
+      libuuid m4 glib libxslt libgcrypt libgpgerror
+      libmicrohttpd kexectools libseccomp libffi audit lz4 libapparmor
+      iptables gnu-efi
+      gettext docbook_xsl docbook_xml_dtd_42 docbook_xml_dtd_45
+      (python3.withPackages (pythonPackages: with pythonPackages; [ lxml ]))
+      patchelf
+    ];
+    nativeBuildInputs = with self; [ meson ninja glibcLocales ];
+    src = self.fetchFromGitHub {
+      owner = "Mic92";
+      repo = "systemd";
+      rev = "9f11187dae637c3184922276dd809a0ebcb9cb69";
+      sha256 = "05nknky9ga2spfmid6gwplinn0iyc7rm63dxj7fmnb8yxdywqq1q";
+    };
+    LC_ALL="en_US.utf8";
+
+    configurePhase = ''
+      patchShebangs .
+      substituteInPlace src/network/networkd-manager.c \
+        --replace /usr/lib/systemd/network $out/lib/systemd/network
+      meson -D system-uid-max=499 -D system-gid-max=499 . build
+      cd build
+      '';
+    buildPhase = "ninja systemd-networkd";
+    installPhase = ''
+      mkdir -p $out/{bin,lib/systemd}
+      cp src/shared/libsystemd-shared-*.so $out/lib
+      cp -r ../network $out/lib/systemd/network
+      cp ./systemd-networkd $out/bin
+      patchelf --set-rpath "$out/lib:\$ORIGIN" $out/bin/systemd-networkd
+    '';
+  };
+}

packages.nix

@@ -9,55 +9,12 @@ in {
     extraModulePackages = with linuxPackages_4_11; [ bcc wireguard sysdig ];
     zfs.enableUnstable = true;
   };
-  nixpkgs.config = {
-    allowUnfree = true;
-    packageOverrides = pkgs: rec {
-      hplip = pkgs.hplip.override { withPlugin = true; };
-      #neovim = pkgs.neovim.override {
-      #  vimAlias = true;
-      #  extraPythonPackages = with python27Packages; [jedi];
-      #  #python3Packages = python36Packages;
-      #  extraPython3Packages = with python3Packages; [jedi requests2];
-      #};
-      networkd = stdenv.mkDerivation {
-        name = "systemd-networkd";
-        buildInputs = [ 
-          linuxHeaders pkgconfig intltool gperf libcap kmod
-          xz pam acl
-          libuuid m4 glib libxslt libgcrypt libgpgerror
-          libmicrohttpd kexectools libseccomp libffi audit lz4 libapparmor
-          iptables gnu-efi
-          gettext docbook_xsl docbook_xml_dtd_42 docbook_xml_dtd_45
-          (python3.withPackages (pythonPackages: with pythonPackages; [ lxml ]))
-          patchelf
-        ];
-        nativeBuildInputs = [ meson ninja glibcLocales ];
-        src = fetchFromGitHub {
-          owner = "Mic92";
-          repo = "systemd";
-          rev = "3e56d2b1b121700a858b2e6980f855999ccba538";
-          sha256 = "0bzgmc8lni72fblx1m9fzp62k580bkbbwdkfsdip1khq50bijxn0";
-        };
-        LC_ALL="en_US.utf8";
 
-        configurePhase = ''
-          patchShebangs .
-          meson -D system-uid-max=499 -D system-gid-max=499 . build
-          cd build
-        '';
-        buildPhase = "ninja systemd-networkd";
-        installPhase = ''
-          mkdir -p $out/{bin,lib}
-          cp src/shared/libsystemd-shared-*.so $out/lib
-          cp ./systemd-networkd $out/bin
-          patchelf --set-rpath "$out/lib:\$ORIGIN" $out/bin/systemd-networkd
-        '';
-      };
-    };
-  };
+  nixpkgs.config.allowUnfree = true;
+  nixpkgs.overlays = [ (import <nixpkgs-overlays/mypackages>) ];
 
   environment.systemPackages = [
-    networkd
+    mysystemd
     linuxPackages.bcc
     usbutils
     (sysdig.overrideDerivation (old: { dontStrip = true; }))