add assertions for blind grep
blind grep is error-prone.
Add assertions for errors we can not handle
Change-Id: Ibe19085545ecc848498506e8b8ee14e71825b273
diff --git a/exercises/volumes.sh b/exercises/volumes.sh
index 9ee9fa9..77fa4eb 100755
--- a/exercises/volumes.sh
+++ b/exercises/volumes.sh
@@ -118,6 +118,7 @@
if [[ -z "$INSTANCE_TYPE" ]]; then
# grab the first flavor in the list to launch if default doesn't exist
INSTANCE_TYPE=$(nova flavor-list | head -n 4 | tail -n 1 | get_field 1)
+ die_if_not_set $LINENO INSTANCE_TYPE "Failure retrieving INSTANCE_TYPE"
fi
# Clean-up from previous runs