From 0acb2dc28ad9d526691167a50d5b09a4d4cd3388 Mon Sep 17 00:00:00 2001
From: Daniel Wang <wonderfly@google.com>
Date: Mon, 20 Jun 2016 11:17:53 -0700
Subject: [PATCH] Make GCI_DOCKER_VERSION optional

fixes #26813

This env var is only set in `config-test.sh` and trying to evaluate it with
`nounset` set will end up with an "unbound variable" error.
---
 cluster/gce/gci/helper.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/cluster/gce/gci/helper.sh b/cluster/gce/gci/helper.sh
index d4f900c715d..8d653512e81 100755
--- a/cluster/gce/gci/helper.sh
+++ b/cluster/gce/gci/helper.sh
@@ -32,7 +32,7 @@ EOF
   fi
   if [[ ! -f "${KUBE_TEMP}/gci-docker-version.txt" ]]; then
     cat >"${KUBE_TEMP}/gci-docker-version.txt" << EOF
-${GCI_DOCKER_VERSION}
+${GCI_DOCKER_VERSION:-}
 EOF
   fi
 }