From 63ae447a0fb30e0be364837ca0ceec6cfc12d252 Mon Sep 17 00:00:00 2001
From: Nikita Mikhailov <nslqqq@gmail.com>
Date: Sun, 8 Mar 2015 18:29:14 +0100
Subject: [PATCH 1/2] Add 'fixedWidthString' and 'fixedWidthNumber' formatting
 functions

---
 lib/strings.nix | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/lib/strings.nix b/lib/strings.nix
index 56d990de62da..39112407c570 100644
--- a/lib/strings.nix
+++ b/lib/strings.nix
@@ -208,4 +208,15 @@ rec {
   # standard GNU Autoconf scripts.
   enableFeature = enable: feat: "--${if enable then "enable" else "disable"}-${feat}";
 
+  # Create a fixed width string with additional prefix to match required width
+  fixedWidthString = width: filler: str:
+    let
+      strw = lib.stringLength str;
+      reqWidth = width - (lib.stringLength filler);
+    in
+      assert strw <= width;
+      if strw == width then str else filler + fixedWidthString reqWidth filler str;
+
+  # Format a number adding leading zeroes up to fixed width
+  fixedWidthNumber = width: n: fixedWidthString width "0" (toString n);
 }

From 579159c72b222278dbec156a1526faddbe56472f Mon Sep 17 00:00:00 2001
From: Nikita Mikhailov <nslqqq@gmail.com>
Date: Sun, 8 Mar 2015 18:30:15 +0100
Subject: [PATCH 2/2] Add dispatcher configuration options to NetworkManager
 module

---
 .../services/networking/networkmanager.nix    | 37 ++++++++++++++++++-
 1 file changed, 36 insertions(+), 1 deletion(-)

diff --git a/nixos/modules/services/networking/networkmanager.nix b/nixos/modules/services/networking/networkmanager.nix
index f72c7fb39d6c..3a64d3f09e02 100644
--- a/nixos/modules/services/networking/networkmanager.nix
+++ b/nixos/modules/services/networking/networkmanager.nix
@@ -71,6 +71,13 @@ let
     ${coreutils}/bin/rm -f $tmp $tmp.ns
   '';
 
+  # pre-up and pre-down hooks were added in NM 0.9.10, but we still use 0.9.0
+  dispatcherTypesSubdirMap = {
+    "basic" = "";
+    /*"pre-up" = "pre-up.d/";
+    "pre-down" = "pre-down.d/";*/
+  };
+
 in {
 
   ###### interface
@@ -118,6 +125,30 @@ in {
         '';
       };
 
+      dispatcherScripts = mkOption {
+        type = types.listOf (types.submodule {
+          options = {
+            source = mkOption {
+              type = types.str;
+              description = ''
+                A script source.
+              '';
+            };
+
+            type = mkOption {
+              type = types.enum (attrNames dispatcherTypesSubdirMap); 
+              default = "basic";
+              description = ''
+                Dispatcher hook type. Only basic hooks are currently available.
+              '';
+            };
+          };
+        });
+        default = [];
+        description = ''
+          A list of scripts which will be executed in response to  network  events.
+        '';
+      };
     };
   };
 
@@ -155,7 +186,11 @@ in {
     ] ++ optional (cfg.appendNameservers == [] || cfg.insertNameservers == [])
            { source = overrideNameserversScript;
              target = "NetworkManager/dispatcher.d/02overridedns";
-           };
+           }
+      ++ lib.imap (i: s: {
+        text = s.source;
+        target = "NetworkManager/dispatcher.d/${dispatcherTypesSubdirMap.${s.type}}03userscript${lib.fixedWidthNumber 4 i}";
+      }) cfg.dispatcherScripts;
 
     environment.systemPackages = cfg.packages ++ [
         networkmanager_openvpn