From 67ff5963500dd2e1876afaab5f804a74b88026f1 Mon Sep 17 00:00:00 2001
From: Ryan Moran <rmoran@vmware.com>
Date: Mon, 20 Mar 2023 15:53:21 -0700
Subject: [PATCH] Default to empty string if CF_STACK unbound

---
 bin/run | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/bin/run b/bin/run
index c4bd677b81..f090e8a896 100755
--- a/bin/run
+++ b/bin/run
@@ -93,7 +93,7 @@ function main() {
   local phase
   phase="$(basename "${0}")"
 
-  if [[ "${CF_STACK}" == "cflinuxfs4" ]]; then
+  if [[ "${CF_STACK:-}" == "cflinuxfs4" ]]; then
     if [[ ! -e "${RUBY_DIR}" ]]; then
       mkdir -p "${RUBY_DIR}"