set -o errexit
set -o pipefail
+# disable Fuel ISO download for master branch
+[[ "$BRANCH" == 'master' ]] && exit 0
+
# use proxy url to replace the nomral URL, for googleusercontent.com will be blocked randomly
[[ "$NODE_NAME" =~ (zte) ]] && GS_URL=${GS_BASE_PROXY%%/*}/$GS_URL