#!/bin/bash

METADATA_CACHE=`mktemp -u`

get_metadata() {
    if [ ! -f $METADATA_CACHE ]; then
        /usr/local/bin/oc-metadata --cached > $METADATA_CACHE
    fi
}

get_value() {
  # Get value from metadata
  key="$1"
  grep "^$key=" "$METADATA_CACHE" | cut -d= -f2 | sed "s/^['\"]//;s/['\"]$//"
}

add_volumes() {
    keys=$(get_value VOLUMES)
    for key in $keys
    do
	test $key -eq 0 && continue
	host=$(get_value VOLUMES_${key}_EXPORT_URI | sed 's|nbd://\(.*\):.*|\1|')
	port=$(get_value VOLUMES_${key}_EXPORT_URI | sed 's|nbd://.*:\(.*\)|\1|')
	device=/dev/nbd$key
	xnbd-client -c $device && continue
	for i in {1..3}
	do
	    xnbd-client --connect $device $host $port --blocksize 4096 && break
	    sleep 5
	done
    done
}

get_metadata
add_volumes
rm $METADATA_CACHE