#!/bin/bash

UPDATE=$(apk update 2>&1)
if [ $? -ne 0 ]
then
	echo "UNKNOWN - Fail to update packages lists"
	echo -e "$UNKNOWN"
	exit 3
fi

UPGRADES=$(apk -u list 2>&1)
if [ $? -ne 0 ]
then
	echo "UNKNOWN - Fail to list available upgrades"
	echo -e "$UPGRADES"
	exit 3
fi

if [ -z "$UPGRADES" ]
then
	echo "OK - System is uptodate"
	exit 0
fi

echo "WARNING - $(echo -e "$UPGRADES"|wc -l) upgrades available"
echo -e "$UPGRADES"
exit 1