From 7a697337040c7460bb876b444f1bebb33204c0f1 Mon Sep 17 00:00:00 2001
From: Peter Simons <simons@cryp.to>
Date: Tue, 8 May 2012 11:46:01 +0000
Subject: [PATCH] Added 'networking.dhcpcd.denyInterfaces' to extend the list
 of network interfaces black-listed for dhcpcd via configuration.nix. I use
 this option to disable DHCP for "veth*" interfaces, which are created by LXC
 for use inside of virtual machines.

svn path=/nixos/trunk/; revision=34018
---
 modules/services/networking/dhcpcd.nix | 20 +++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)

diff --git a/modules/services/networking/dhcpcd.nix b/modules/services/networking/dhcpcd.nix
index b22bbb3f051..122faf98136 100644
--- a/modules/services/networking/dhcpcd.nix
+++ b/modules/services/networking/dhcpcd.nix
@@ -10,7 +10,8 @@ let
   # interfaces that are part of a bridge.
   ignoredInterfaces =
     map (i: i.name) (filter (i: i ? ipAddress && i.ipAddress != "" ) config.networking.interfaces)
-    ++ concatLists (attrValues (mapAttrs (n: v: v.interfaces) config.networking.bridges));
+    ++ concatLists (attrValues (mapAttrs (n: v: v.interfaces) config.networking.bridges))
+    ++ config.networking.dhcpcd.denyInterfaces;
 
   # Config file adapted from the one that ships with dhcpcd.
   dhcpcdConf = pkgs.writeText "dhcpcd.conf"
@@ -70,6 +71,23 @@ in
 
 {
 
+  ###### interface
+
+  options = {
+
+    networking.dhcpcd.denyInterfaces = mkOption {
+      default = [];
+      description = ''
+         Disable the DHCP client for any interface which's name matches
+         any of the shell glob patterns in this list. The purpose of
+         this option is blacklist virtual interfaces such as those
+         created by Xen, libvirt, LXC, etc.
+      '';
+    };
+
+  };
+
+
   ###### implementation
 
   config = mkIf config.networking.useDHCP {