From 9fc59ec9be365c6ca7d4e5af9803cb8719921fc0 Mon Sep 17 00:00:00 2001
From: Philipp Marek <philipp.marek@linbit.com>
Date: Wed, 23 Sep 2015 15:44:50 +0200
Subject: [PATCH] Fix an assumption: "btrfs-tools" might not be installed.

And then the "80-btrfs-lvm.rules" doesn't exist, too.

Change-Id: Ic9b9217126a303e67c02eaefd1c29126ba87ad54
---
 devstack/lib/drbd_devstack | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/devstack/lib/drbd_devstack b/devstack/lib/drbd_devstack
index cf866bc..2137c54 100755
--- a/devstack/lib/drbd_devstack
+++ b/devstack/lib/drbd_devstack
@@ -116,12 +116,13 @@ function _drbd_make_vg {
 }
 
 function _modify_udev_file {
-    file="$1"
-    search="$2"
-    sed_cmd="$3"
+    local file="$1"
+    local search="$2"
+    local sed_cmd="$3"
+    local path="/lib/udev/rules.d/${file}"
 
-    if ! grep "${search}" "/lib/udev/rules.d/${file}" ; then
-        sudo sed -i "${sed_cmd}" "/lib/udev/rules.d/${file}"
+    if [[ -f "$path" ]] && ! grep "${search}" "$path"; then
+        sudo sed -i "${sed_cmd}" "$path"
     fi
 }