From 67b12d12f658f5b3fecd89775fa4d120614c819a Mon Sep 17 00:00:00 2001
From: Julien Escario <julien.escario@altinea.fr>
Date: Fri, 18 Jun 2021 14:41:46 +0200
Subject: [PATCH] Verify args

---
 cloud-init/create_ubuntu20_template.sh | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/cloud-init/create_ubuntu20_template.sh b/cloud-init/create_ubuntu20_template.sh
index 2fc3f29..ff154b1 100644
--- a/cloud-init/create_ubuntu20_template.sh
+++ b/cloud-init/create_ubuntu20_template.sh
@@ -1,6 +1,15 @@
 #!/bin/sh
 
-_storage=${1}
+_usage() {
+  echo "
+  Usage: $0 <storage>
+  <storage> : should be a valid (active, supporting VM image) PVE storage
+  "
+}
+
+[ -z "$1" ] && _usage && return
+
+_storage=$1
 pvesm status --enabled --target localhost --content images |awk {'print $1'} |tail +2 |grep "$_storage"  > /dev/null 2>&1
 if [ "$?" -ne "0" ]; then
         echo "Storage $_storage does not seems to exists. Use 'pvesm status' to find a usable storage"