use explicit CWD when compying devstack
diff --git a/build_lxc.sh b/build_lxc.sh
index 674742c..b97f8db 100755
--- a/build_lxc.sh
+++ b/build_lxc.sh
@@ -10,6 +10,9 @@
 # Source params
 source ./stackrc
 
+# Store cwd
+CWD=`pwd`
+
 # Configurable params
 BRIDGE=${BRIDGE:-br0}
 CONTAINER=${CONTAINER:-STACK}
@@ -105,7 +108,7 @@
 # Use this version of devstack?
 if [ "$USE_CURRENT_DEVSTACK" = "1" ]; then
     rm -rf $CACHEDIR/opt/devstack
-    cp -pr . $CACHEDIR/opt/devstack
+    cp -pr $CWD $CACHEDIR/opt/devstack
 fi
 
 # Destroy the old container