report-pending-upgrades.sh
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	aborrero
	Nov 22 2017, 1:54 PM

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report-pending-upgrades.sh
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	#!/bin/bash

	if [ "$(id -u)" != "0" ] ; then
	echo "E: root required" >&2
	exit 1
	fi

	get_binary()
	{
	BINARY=$(which $1)
	if [ ! -x "$BINARY" ] ; then
	echo "E: no $1 binary found" >&2
	exit 1
	fi
	echo $BINARY
	}

	APT_GET=$(get_binary apt-get)
	APT_SHOW_VERSIONS=$(get_binary apt-show-versions)
	UNATTENDED_UPGRADES=$(get_binary unattended-upgrades)

	echo "I: updating package cache"
	$APT_GET update >/dev/null

	APT_SHOW_VERSIONS_OUTPUT=$($APT_SHOW_VERSIONS \| grep upgradeable)
	n1=$(echo "$APT_SHOW_VERSIONS_OUTPUT" \| grep -v ^$ \| wc -l)

	UNATTENDED_UPGRADES_OUTPUT=$($UNATTENDED_UPGRADES --dry-run -v -d \| grep "Packages that will be upgraded" \| awk -F':' '{print $2}' \| grep -v ^[[:space:]]*$)
	n2=$(echo "$UNATTENDED_UPGARDES_OUTPUT" \| grep -v ^$ \| wc -l)

	if [ "$n1" != "0" ] ; then
	echo "I: upgradeable packages: $n1"
	echo
	echo "$APT_SHOW_VERSIONS_OUTPUT"
	echo
	fi

	if [ "$n2" != "0" ] ; then
	echo "I: upgradeable packages by unattended-upgrades: $n2"
	echo
	echo "$UNATTENDED_UPGARDES_OUTPUT"
	echo
	fi
	echo "I: $n1 upgradeable packages, $n2 upgradeable packages by unatteneded-upgrades"