Check out devstack by default
diff --git a/tools/build_ramdisk.sh b/tools/build_ramdisk.sh
index 63d37a9..85d3743 100755
--- a/tools/build_ramdisk.sh
+++ b/tools/build_ramdisk.sh
@@ -100,6 +100,8 @@
 if [ "$USE_CURRENT_DEVSTACK" = "1" ]; then
     rm -rf $CHROOTCACHE/natty-stack/$DEST/devstack
     cp -pr $CWD $CHROOTCACHE/natty-stack/$DEST/devstack
+else
+    git_clone $DEVSTACK_REPO $DEST/devstack $DEVSTACK_BRANCH
 fi
 
 # Configure host network for DHCP