From 7e87dbaa39b251d271d7f8fba722bf2fba8be2a4 Mon Sep 17 00:00:00 2001
From: Brian O'Connor <bocon@onlab.us>
Date: Mon, 5 Aug 2013 14:00:37 -0700
Subject: [PATCH] Fixed modprobe install. Checks to ensure that OVS_KMODS is
 set

---
 util/install.sh | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/util/install.sh b/util/install.sh
index 136c8fa..e6fdf92 100755
--- a/util/install.sh
+++ b/util/install.sh
@@ -605,9 +605,14 @@ net.ipv6.conf.lo.disable_ipv6 = 1' | sudo tee -a /etc/sysctl.conf > /dev/null
 # a good idea to use a symbolic link in place of the copy below.
 function modprobe {
     echo "Setting up modprobe for OVS kmod..."
-
-    sudo cp $OVS_KMODS $DRIVERS_DIR
-    sudo depmod -a ${KERNEL_NAME}
+    set +o nounset
+    if [ -z "$OVS_KMODS" ]; then
+      echo "OVS_KMODS not set. Aborting."
+    else
+      sudo cp $OVS_KMODS $DRIVERS_DIR
+      sudo depmod -a ${KERNEL_NAME}
+    fi
+    set -o nounset
 }
 
 function all {