postinst is in sarg 2.3.2-2.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 | #! /bin/sh
set -e
# Move a conffile without triggering a dpkg question
mv_conffile() {
    local OLDCONFFILE="$1"
    local NEWCONFFILE="$2"
    [ -e "$OLDCONFFILE" ] || return 0
    echo "Preserving user changes to $NEWCONFFILE ..."
    mv -f "$NEWCONFFILE" "$NEWCONFFILE".dpkg-new
    mv -f "$OLDCONFFILE" "$NEWCONFFILE"
}
case "$1" in
	install|configure)
		if dpkg --compare-versions "$2" lt 2.2.6-1; then
			mv_conffile "/etc/squid/sarg.conf" "/etc/sarg/sarg.conf"
			mv_conffile "/etc/squid/sarg.exclude_codes" "/etc/sarg/exclude_codes"
			mv_conffile "/etc/squid/sarg.hosts" "/etc/sarg/exclude_hosts"
			mv_conffile "/etc/squid/sarg-reports.conf" "/etc/sarg/sarg-reports.conf"
			mv_conffile "/etc/squid/sarg.users" "/etc/sarg/exclude_users"
			mv_conffile "/etc/squid/sarg.usertab" "/etc/sarg/usertab"
			mv_conffile "/etc/squid/user_limit_block" "/etc/sarg/user_limit_block"
		fi
		if [ -e /etc/squid/fonts/Verdana.TTF ] ; then
			rm /etc/squid/fonts/Verdana.TTF
		fi
		if [ -e /etc/squid/fonts/license ] ; then
			rm /etc/squid/fonts/license
		fi
		if [ -e /etc/squid/fonts/README ] ; then
			rm /etc/squid/fonts/README
		fi
		if [ -e /etc/squid/sarg-maint.sh ] ; then
			rm /etc/squid/sarg-maint.sh
		fi
		;;
	abort-upgrade|abort-remove|abort-deconfigure)
		;;
	*)
		#
		#	Unknown action - do nothing.
		#
		exit 0
		;;
esac
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