cant suppress or use an AWS-CLI error in bash - bash

Question

i have a simple script that i want to display specific information from AWS using
AWS CLI.
for example:
get_cluster_name() {
EKS_NAME=$(aws eks describe-cluster --name ${CUSTOMER_NAME}) && \
echo $EKS_NAME | jq -r .cluster.name}
the output when the cluster exist is ok, i get the name of the cluster.
when the cluster does not exist, i get:
An error occurred (ResourceNotFoundException) when calling the DescribeCluster operation: No cluster found for name: example_cluster.
my goal is to get an empty output when a cluster is not found.
for that i wanted to use the return code in a condition or a string lookup in the output.
the issue is that the output is not stdout or stderr, therefor
i cant even direct it to /dev/null just to silence the error.
how can i make this code work properly?:
[[ $(get_cluster_name) =~ "ResourceNotFoundException" ]] && echo "EKS Cluster:....$(get_cluster_name)"
or
[[ $(get_cluster_name) ]] && echo "EKS Cluster:....$(get_cluster_name)"
Thank you.

Answer 1

Here's a consideration, and expansion on my comments. Again you're getting a stderr response when no cluster is found, so this makes this pretty straightforward.
Using >2 /dev/null to suppress that return message in stderr. Then using ret=$? to capture the return code.
get_cluster_name() {
EKS_NAME=$(aws eks describe-cluster --name ${CUSTOMER_NAME} 2> /dev/null);
ret=$?
if [ $ret -eq 0 ]; then
echo $EKS_NAME | jq -r .cluster.name
return 0
else
return $ret
fi
}
You can do the same thing now when you call the function as your error will propagate from aws command up the stack:
cluster=$(get_cluster_name)
ret=$?
if [ $ret -eq 0 ]; then
echo $cluster
else
echo "failed to find cluster. Error code: $ret"
fi
As an example.