#!/bin/sh

ROOT=

# parse command line params
while [ $# != 0 ]; do
	opt="$1"

	case "$opt" in
		enable)
			shift

			service="$1"
			shift
			;;
		--root=*)
			ROOT=${opt##--root=}
			shift
			;;
		*)
			echo "'$opt' is an unkown option; exiting with error"
			exit 1
			;;
	esac
done

# find service file
for p in $ROOT/etc/systemd/system \
         $ROOT/lib/systemd/system \
         $ROOT/usr/lib/systemd/system; do
	if [ -e $p/$service ]; then
		service_file=$p/$service
		service_file=${service_file##$ROOT}
	fi
done
if [ -z "$service_file" ]; then
	echo "'$service' couldn't be found; exiting with error"
	exit 1
fi

# create the required symbolic links
wanted_by=$(grep WantedBy $ROOT/$service_file \
                | sed 's,WantedBy=,,g' \
                | tr ',' '\n' \
                | grep '\.target$')

for r in $wanted_by; do
	mkdir -p $ROOT/etc/systemd/system/$r.wants
	ln -s $service_file $ROOT/etc/systemd/system/$r.wants
	echo "Enabled $service for $wanted_by."
done

# call us for the other required scripts
also=$(grep Also $ROOT/$service_file \
           | sed 's,Also=,,g' \
           | tr ',' '\n')
for a in $also; do
	$0 --root=$ROOT enable $a
done