#!/bin/sh -e

#DEBHELPER#

# ionice should not be called in a virtual environment
# (similar to man-db cronjobs)
if [ -x /usr/bin/ionice ] && ! egrep -q '(envID|VxID):.*[1-9]' /proc/self/status
then
	IONICE="/usr/bin/ionice -c3"
else
	IONICE=""
fi

case "$1" in
    configure)
        # Just checking the main directory with -d should prevent the indexing
        # to be started while an indexing is already going on, as the first
        # thing that update-apt-xapian-index does is to create the directory if
        # it is missing
        #
        # we also full-regenerate the index on upgrades from older versions
        # because the weekly --update cron job will not use new plugins for
        # already indexed packages
        if [ ! -d /var/lib/apt-xapian-index ] || dpkg --compare-versions "$2" lt-nl "0.39"
        then
                if [ ! -x /usr/sbin/policy-rc.d ] || /usr/sbin/policy-rc.d apt-xapian-index start
                then
                        echo "apt-xapian-index: Building new index in background..."
                        $IONICE nice /usr/sbin/update-apt-xapian-index --force --quiet &
                fi
        fi
        ;;
esac

exit 0
