#!/bin/sh

set -e

PKG_LIST=$@

ME=$(basename $0)

TMPF=$(mktemp -t ${ME}.XXXXXX)

for PKG in ${PKG_LIST} ; do
	# Only upgrade packages that are present on a host
	if dpkg-query -W ${PKG} 1>/dev/null 2>/dev/null ; then
		TMPF2=$(mktemp -t ${ME}.XXXXXX)
		apt-cache policy $PKG >${TMPF2}
		INSTALLED=$(cat ${TMPF2} | grep Installed | awk '{print $2}')
		CANDIDATE=$(cat ${TMPF2} | grep Candidate | awk '{print $2}')
		rm -f ${TMPF2}
		if [ "${INSTALLED}" != "(none)" ] ; then
			if dpkg --compare-versions ${CANDIDATE} gt ${INSTALLED} ; then
				echo -n "${PKG} " >>${TMPF}
			fi
		fi
	fi
done
cat ${TMPF}
rm -f ${TMPF}
