From 5302ae32976b840954bbe642d54c3ef67c9e459a Mon Sep 17 00:00:00 2001
From: Stefan Reimer <stefan@zero-downtime.net>
Date: Fri, 19 Mar 2021 10:15:15 +0100
Subject: [PATCH] Make setClusterVersion less brittle

---
 scripts/setClusterVersion.sh | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/scripts/setClusterVersion.sh b/scripts/setClusterVersion.sh
index f0252da..2fcfe51 100755
--- a/scripts/setClusterVersion.sh
+++ b/scripts/setClusterVersion.sh
@@ -1,4 +1,5 @@
 #!/bin/bash
+set -o pipefail
 
 # Meant for testing only !!!
 
@@ -8,5 +9,14 @@
 CONGLOMERATE=$1
 VERSION=$2
 
-aws ssm put-parameter --name /cloudbender/${CONGLOMERATE}/kubecontrol/meta/clusterversion --type SecureString --value "$(echo "$VERSION" | base64 -w0)" --overwrite
+P="/cloudbender/${CONGLOMERATE}/kubecontrol/meta/clusterversion"
 
+export AWS_DEFAULT_OUTPUT=text
+
+# First verify we point to an existing clusterVersion
+OLD=$(aws ssm get-parameter --name $P --with-decryption --query 'Parameter.Value' | base64 -d) || \
+  { echo "Cannot find an existing SSM parameter. Make sure your AWS profile and parameters are correct."; exit 1; }
+
+echo "Current version: $OLD"
+aws ssm put-parameter --name $P --type SecureString --value "$(echo "$VERSION" | base64 -w0)" --overwrite
+echo "New version: $VERSION"