Retrieve helm deployment json from a provided secret name

get-helm-chart.sh

#!/usr/bin/env bash

if [ $# -ne 1 ]; then
	cat >&2 <<-USAGE
		Usage: $0 <namespace>/<secret>

		Example: $0 cert-manager/sh.helm.release.v1.cert-manager.v1
	USAGE
	exit 1
fi

namespace="$(cut -d'/' -f1 <<<"${1}")"
name="$(cut -d'/' -f2 <<<"${1}")"

exec kubectl get secret \
	-n "$namespace" "$name" \
	-o jsonpath='{ .data.release }' |
		base64 -d |
		base64 -d |
		gunzip -c