#!/bin/sh
#
# apt-update
#
# Simple wrapper script for cron to use - check for updated packages
# and mail admin with any recommended upgrades.
# 
# Assumes that apt is configured correctly before we start...
#
# Copyright 2001-2019 Steve McIntyre <steve@einval.com>
# GPL-2+

unset LANGUAGE
unset LANG
unset LC_ALL

TMPFILE=/etc/apt/update.tmp

. /etc/apt/update.conf

for CHROOT in $CHROOTS
do
    case $CHROOT in
	/)
	    CHR="";;
	/*)
	    CHR="chroot $CHROOT";;
	*)
	    CHR="schroot -c $CHROOT --";;
    esac

    # Work out a simple version number for comparisons, using the major
    # and minor versions. Ignore the third component, as we might see
    # things like "1.8.0~rc3"
    APT_VER=$($CHR apt-get --version | awk \
              '/^apt/ {
                  FULL=$2
                  split(FULL, VERS, ".")
                  printf("%d\n", VERS[1]*100 + VERS[2]*1);
              }')

    APT_OPTIONS=""
    if [ $APT_VER -gt 105 ]; then
	APT_OPTIONS="--allow-releaseinfo-change"
    fi

    $CHR apt-get update $APT_OPTIONS > $TMPFILE 2>&1
    error=$?
    if [ $error -ne 0 ] ; then
	echo $CHR update failed with error $error
	echo
    fi
    # And also check for warnings:
    grep -q ^W $TMPFILE
    if [ $? -eq 0 ] ; then
	echo "$CHR update gave the following warnings:"
	grep ^W $TMPFILE
    fi
    rm -f $TMPFILE

    THIS_LIST=`$CHR apt-get -s -u dist-upgrade | awk '/^Inst/ {print $2}'`
    if [ "$THIS_LIST"x != ""x ] ; then
	UPDATE_LIST="$UPDATE_LIST\n$CHROOT:\n"
	for PKG in $THIS_LIST
	do
            UPDATE_LIST="$UPDATE_LIST $PKG\n"
	done
	CHROOT_UPDATED="$CHROOT_UPDATED $CHROOT"
    fi
done

if [ "$UPDATE_LIST"x != ""x ] ; then
    # If we've been configured to download packages, grab them now
    # before we finish
    if [ "$DOWNLOAD_DEBS"x = "yes"x ] ; then
        for CHROOT in $CHROOT_UPDATED
        do
	    case $CHROOT in
		/)
		    CHR="";;
		/*)
		    CHR="chroot $CHROOT";;
		*)
		    CHR="schroot -c $CHROOT --";;
	    esac
            $CHR apt-get -d -y dist-upgrade > /dev/null
            error=$?
            if [ $error -ne 0 ] ; then
                echo $CHR package download failed with error $error
            fi
        done
        UPDATE_LIST="$UPDATE_LIST\n\nPackage(s) downloaded and ready to install\n"
    fi

    printf "$UPDATE_LIST\n"
fi