regenerating /var/db/pkg

[Eitan Adler]

taking into account your feedback here is the new version
If all is good I'll submit a PR....

#!/bin/sh
#
# $FreeBSD: src/etc/periodic/daily/210.backup-aliases,v 1.6.36.1.2.1
2009/10/25 01:10:29 kensmith Exp $
#

# If there is a global system configuration file, suck it in.
#
if [ -r /etc/defaults/periodic.conf ]
then
    . /etc/defaults/periodic.conf
    source_periodic_confs
fi

bak=/var/backups
db_loc="/var/db/pkg";
bk_loc="$bak/pkgdb.bak.tar"

case "$daily_backup_pkgdb_enable" in
    [Yy][Ee][Ss])
	if [ ! -d $db_loc ]
	then
	    echo '$daily_backup_pkgdb_enable is enabled but' \
		"$db_loc doesn't exist"
	    rc=2
	else
	    rc=0

	    echo ""
	    echo "Backing up package db directory:"

	    rm -f $bk_loc
	    tar -cjf $bk_loc $db_loc || rc=3
	fi;;

    *)  rc=0;;
esac

exit $rc