systemd/systemd-insserv_conf

#!/bin/bash

[ -r /etc/insserv.conf ] || exit 0

declare -A facilities
facilities["local_fs"]="local-fs.target"
facilities["localfs"]="local-fs.target"
facilities["named"]="nss-lookup.target"
facilities["network"]="network.target"
# done in systemd code
#facilities["portmap"]="rpcbind.target"
facilities["remote_fs"]="remote-fs.target"
facilities["syslog"]="syslog.target"
facilities["time"]="time-sync.target"

while read line ; do
  case "$line" in
  \#*|"" ) continue;;
  \<* ) continue;;
  \$*)  t=${line%%	*} 
        target=${facilities[${t:1}]}
	[ -z $target ] && continue
        mkdir -p $1/$target.{requires,wants}
	for dep in ${line##*	} ; do
          stripped_dep=${dep/boot./}
	  case "$stripped_dep" in 
          +*) ln -s -f /lib/systemd/system/${facilities[${stripped_dep:2}]:-${stripped_dep:1}.service} $1/$target.wants/ ;;
	  *) ln -s -f /lib/systemd/system/${facilities[${stripped_dep:1}]:-${stripped_dep}.service} $1/$target.requires/ ;;
	  esac
	done 
	;;
  esac
done < /etc/insserv.conf