From b4528a696a6ea50b98ac1919fc2da85e325cab41 Mon Sep 17 00:00:00 2001
From: Nikolay Amiantov <ab@fmap.me>
Date: Wed, 3 Feb 2016 15:51:28 +0300
Subject: [PATCH] initrd-network: call postCommands only if network is up

---
 nixos/modules/system/boot/initrd-network.nix | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/nixos/modules/system/boot/initrd-network.nix b/nixos/modules/system/boot/initrd-network.nix
index 8ccf56ff6e0d..6e226c190609 100644
--- a/nixos/modules/system/boot/initrd-network.nix
+++ b/nixos/modules/system/boot/initrd-network.nix
@@ -63,9 +63,9 @@ in
       copy_bin_and_libs ${pkgs.mkinitcpio-nfs-utils}/bin/ipconfig
     '';
 
-    boot.initrd.preLVMCommands =
+    boot.initrd.preLVMCommands = mkBefore (
       # Search for interface definitions in command line.
-      mkBefore ''
+      ''
         for o in $(cat /proc/cmdline); do
           case $o in
             ip=*)
@@ -87,11 +87,16 @@ in
 
           # Acquire a DHCP lease.
           echo "acquiring IP address via DHCP..."
-          udhcpc --quit --now --script ${udhcpcScript}
+          udhcpc --quit --now --script ${udhcpcScript} && hasNetwork=1
         fi
       ''
 
-      + cfg.postCommands;
+      + ''
+        if [ -n "$hasNetwork" ]; then
+          echo "networking is up!"
+          ${cfg.postCommands}
+        fi
+      '');
 
   };