Entrpoint err/exit when deprecated env vars are detected

Author: yosifkit

3.9-rc/alpine/docker-entrypoint.sh

@@ -10,6 +10,41 @@ if [[ "$1" == rabbitmq* ]] && [ "$(id -u)" = '0' ]; then
 	exec gosu rabbitmq "$BASH_SOURCE" "$@"
 fi
 
+deprecatedEnvVars=(
+	RABBITMQ_DEFAULT_PASS
+	RABBITMQ_DEFAULT_PASS_FILE
+	RABBITMQ_DEFAULT_USER
+	RABBITMQ_DEFAULT_USER_FILE
+	RABBITMQ_DEFAULT_VHOST
+	RABBITMQ_MANAGEMENT_SSL_CACERTFILE
+	RABBITMQ_MANAGEMENT_SSL_CERTFILE
+	RABBITMQ_MANAGEMENT_SSL_DEPTH
+	RABBITMQ_MANAGEMENT_SSL_FAIL_IF_NO_PEER_CERT
+	RABBITMQ_MANAGEMENT_SSL_KEYFILE
+	RABBITMQ_MANAGEMENT_SSL_VERIFY
+	RABBITMQ_SSL_CACERTFILE
+	RABBITMQ_SSL_CERTFILE
+	RABBITMQ_SSL_DEPTH
+	RABBITMQ_SSL_FAIL_IF_NO_PEER_CERT
+	RABBITMQ_SSL_KEYFILE
+	RABBITMQ_SSL_VERIFY
+	RABBITMQ_VM_MEMORY_HIGH_WATERMARK
+)
+hasOldEnv=
+for old in "${deprecatedEnvVars[@]}"; do
+	if [ -n "${!old:-}" ]; then
+		echo >&2 "error: $old is set but deprecated"
+		hasOldEnv=1
+	fi
+done
+if [ -n "$hasOldEnv" ]; then
+	echo >&2 'error: deprecated environment variables detected'
+	echo >&2
+	echo >&2 'Please use a configuration file instead; visit https://www.rabbitmq.com/configure.html to learn more'
+	echo >&2
+	exit 1
+fi
+
 # if long and short hostnames are not the same, use long hostnames
 if [ -z "${RABBITMQ_USE_LONGNAME:-}" ] && [ "$(hostname)" != "$(hostname -s)" ]; then
 	: "${RABBITMQ_USE_LONGNAME:=true}"