Specify required path for kafka download mirror selection (wurstmeister#318)

Fixes wurstmeister#310

Author: mielmat

download-kafka.sh

@@ -1,11 +1,11 @@
 #!/bin/sh -e
 
-mirror=$(curl --stderr /dev/null 'https://www.apache.org/dyn/closer.cgi?as_json=1' | jq -r '.preferred')
+path="kafka/${KAFKA_VERSION}/kafka_${SCALA_VERSION}-${KAFKA_VERSION}.tgz"
+url=$(curl --stderr /dev/null "https://www.apache.org/dyn/closer.cgi?path=/${path}&as_json=1" | jq -r '"\(.preferred)\(.path_info)"')
 
-if [[ -z "$mirror" ]]; then
+if [[ -z "$url" ]]; then
 	echo "Unable to determine mirror for downloading Kafka, the service may be down"
 	exit 1
 fi
 
-url="${mirror}kafka/${KAFKA_VERSION}/kafka_${SCALA_VERSION}-${KAFKA_VERSION}.tgz"
 wget -q "${url}" -O "/tmp/kafka_${SCALA_VERSION}-${KAFKA_VERSION}.tgz"