File find_mpm of Package Apache2

#!/bin/bash

: ${apache_link:=/usr/sbin/httpd2}

. /usr/share/apache2/load_configuration

if ! ${mpm_set:=false}; then 
	if [ -z "$APACHE_MPM" ]; then 
		# guess
		for i in $r/$apache_link-*; do 
			test -f $i || continue
			i=$(basename $i)
			i=${i#*-}
			installed_mpms=(${installed_mpms[*]} $i)
		done
		if [ -z "${installed_mpms[*]}" ]; then
			echo >&2 ${warn}Apache binary ${apache_link#*-} not found. No MPM package installed? $norm
			echo >&2 Hint: install the apache2-prefork package, and try again.
		fi
		if [ ${#installed_mpms[*]} = 1 ]; then
			APACHE_MPM=${installed_mpms[*]}
		else
			case ${installed_mpms[*]} in
			*prefork*)	APACHE_MPM=prefork;;
			*worker*)	APACHE_MPM=worker;;
			*event*)	APACHE_MPM=event;;
			*leader*)	APACHE_MPM=leader;;
			*metuxmpm*)	APACHE_MPM=metuxmpm;;
			*threadpool*)	APACHE_MPM=threadpool;;
			*itk*)          APACHE_MPM=itk;;
			esac
		fi

	fi
	if [ -x $apache_link-$APACHE_MPM ]; then
		ln -sf $apache_link-$APACHE_MPM $apache_link
		echo $apache_link-$APACHE_MPM
	else
		echo >&2 ${warn}$apache_link-$APACHE_MPM is not a valid httpd2 binary. 
		echo >&2 Check your APACHE_MPM setting.$norm
		exit 1
	fi
		
	export APACHE_MPM mpm_set=true
fi