From 676da222901b45396856b56a5e776dcba70b805a Mon Sep 17 00:00:00 2001
From: Christoph Schranz <christoph.schranz@salzburgresearch.at>
Date: Wed, 11 Mar 2020 08:07:03 +0100
Subject: [PATCH] make code cleaner

---
 generate_Dockerfile.sh | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/generate_Dockerfile.sh b/generate_Dockerfile.sh
index e926faa..c1099ef 100755
--- a/generate_Dockerfile.sh
+++ b/generate_Dockerfile.sh
@@ -23,8 +23,8 @@ if [[ "$HEAD_COMMIT" == "latest" ]]; then
   cd $STACKS_DIR && git pull && cd -
 else
   export GOT_HEAD="false"
-  cd $STACKS_DIR && git reset --hard $HEAD_COMMIT > /dev/null 2>&1  && cd - && export GOT_HEAD="true"
-  echo $HEAD
+  cd $STACKS_DIR && git reset --hard "$HEAD_COMMIT" > /dev/null 2>&1  && cd - && export GOT_HEAD="true"
+  echo "$HEAD"
   if [[ "$GOT_HEAD" == "false" ]]; then
     echo "Given sha-commit is invalid."
     echo "Usage: $0 -c [sha-commit] # set the head commit of the docker-stacks submodule (https://github.com/jupyter/docker-stacks/commits/master)."