#!/bin/bash

# set -x

PS=$(which ps)
GREP=$(which grep)
LOGGER=$(which logger)
MKDIR=$(which mkdir)
MOUNT=$(which mount)
MOUNTDIR=/mnt/diskmount/
SERVICEUTIL=openslx-utility.service
SERVICEUMOUNT=openslx-umount.service
SERVICEDISKMOUNT=$(echo "$MOUNTDIR" |tr / -|sed 's:^-::;s:-$::').mount  # mounter needs to be named like that... or else!
TARGET=$(systemctl get-default)


# systemd erkennen
case $(${PS} --pid 1 -o comm h) in
	systemd) echo "openslx praeinstaller: systemd detected."
		if [ -d /etc/systemd/system ]; then
			SERVICEDIR=/etc/systemd/system/
		else
			SERVICEDIR=/lib/systemd/system/
		fi

		if [ -L "${SERVICEDIR}/graphical.target.wants/${SERVICEMOUNT}" ] \
				|| [ -L "${SERVICEDIR}/graphical.target.wants/${SERVICEUMOUNT}" ] \
				|| [ -L "${SERVICEDIR}/graphical.target.wants/${SERVICERESOLUTION}" ]; then
			while [ "$RESCRIPT" != "y" ] && [ "$RESCRIPT" != "n" ]; do
				RESCRIPTDEF=y
				read -e -p "There seems to an older install. Delete (y/n, Default is $RESCRIPTDEF, Ctrl-C to exit): " RESCRIPT
				RESCRIPT="${RESCRIPT:-$RESCRIPTDEF}"
			done
		fi

		if [ "${RESCRIPT}" == "y" ]; then
			# Just unlink stuff...
			echo "Deleting old links..."
			unlink "${SERVICEDIR}/graphical.target.wants/${SERVICEMOUNT}" 2>/dev/null
			unlink "${SERVICEDIR}/shutdown.target.wants/${SERVICEUMOUNT}" 2>/dev/null
			unlink "${SERVICEDIR}/basic.target.wants/${SERVICERESOLUTION}" 2>/dev/null
		fi

		echo "openslx praeinstaller: installing systemd service (floppy disk mounter) to ${SERVICEDIR}/${SERVICEDISKMOUNT}."
		cat <<-HEREDOC > "$SERVICEDIR"/"$SERVICEDISKMOUNT"
			[Unit]
			Description=Mount pseudofloppy fd1

			[Mount]
			What=/dev/fd1
			Where=/mnt/diskmount
			Type=vfat
			Options=defaults
		HEREDOC


		echo "openslx praeinstaller: installing systemd service (openslx utility script) to ${SERVICEDIR}/${SERVICEUTIL}."
		cat <<-HEREDOC > "${SERVICEDIR}"/"${SERVICEUTIL}"
		[Unit]
			Description=openslx utility script
			After=$TARGET
			Requires=${SERVICEDISKMOUNT}
			DefaultDependencies=no
			
			[Service]
			Type=oneshot
			ExecStart=${LOGGER} "openslx utility script: starting."
			ExecStart=${MOUNTDIR}/linux/openslx
			ExecStart=${LOGGER} "openslx service file: done."
			RemainAfterExit=yes
		HEREDOC
	
		echo "openslx praeinstaller: installing systemd service (umounter) to ${SERVICEDIR}/${SERVICEUMOUNT}."
		cat <<-THEREDOC > "$SERVICEDIR"/"${SERVICEUMOUNT}"
			[Unit]
			Description=openSLX umount utility
			Before=shutdown.target 
			DefaultDependencies=no
	
			[Service]
			Type=oneshot
			ExecStart=${LOGGER} "openslx service file: umounter started."
			ExecStart=${MOUNTDIR}/linux/umnt_shares
			ExecStart=${LOGGER} "openslx service file: done."
			RemainAfterExit=no
		THEREDOC
	
		[ ! -d "$SERVICEDIR"/"${TARGET}".wants ]	&& mkdir "$SERVICEDIR"/"${TARGET}".wants 2>/dev/null
		[ ! -d "$SERVICEDIR"/shutdown.target.wants ]	&& mkdir "$SERVICEDIR"/shutdown.target.wants 2>/dev/null
		# some distr. eg. Suse seem to want these:
		# [ ! -d "$SERVICEDIR"/reboot.target.wants ]	&& mkdir "$SERVICEDIR"/reboot.target.wants 2>/dev/null
		# [ ! -d "$SERVICEDIR"/halt.target.wants ]	&& mkdir "$SERVICEDIR"/halt.target.wants 2>/dev/null

		ln -s "${SERVICEDIR}"/"${SERVICEUTIL}" "$SERVICEDIR"/"${TARGET}".wants/"${SERVICEUTIL}"
		ln -s "${SERVICEDIR}"/"${SERVICEUMOUNT}" "$SERVICEDIR"/shutdown.target.wants/"${SERVICEUMOUNT}"
		# ln -s "${SERVICEDIR}"/"${SERVICEUMOUNT}" "$SERVICEDIR"/reboot.target.wants/"${SERVICEUMOUNT}"
		# ln -s "${SERVICEDIR}"/"${SERVICEUMOUNT}" "$SERVICEDIR"/halt.target.wants/"${SERVICEUMOUNT}"
	
		echo "openslx praeinstaller: doing systemd reload."
		systemctl daemon-reload
		;;

	init)	echo "openslx praeinstaller: init(V) detected."
		SERVICEDIR=/etc/init.d/
		[ ! -d "${SERVICEDIR}" ] && { echo "openslx praeinstaller: No init directory $SERVICEDIR found, exiting."; exit 1; }
		SERVICEFILE=openslx-scriptinstall
		echo "openslx praeinstaller: installing init service file to ${SERVICEDIR}/${SERVICEFILE}."
		cat <<-THEREDOC > "${SERVICEDIR}"/"${SERVICEFILE}"
			#!/bin/sh -e
			### BEGIN INIT INFO
			# Provides: openSLX_scriptinstaller
			# Required-Start: 2 3 4 5
			# Required-Stop: 0 1 6
			# Default-Start: 2 3 4 5
			# Default-Stop: 0 1 6
			# X-Interactive: false
			# Short-Description: openSLX script package starter.
			### END INIT INFO
			#
			# Starts via Xsetup patching the openSLX script package
			# to correct screen resolution and mount network shares
			# when Xsetup is started.
			
			case "\$1" in
				start)  ${LOGGER} "openslx init file: started."
					${MKDIR} -p /mnt/diskmount
				        ${MOUNT} | ${GREP} -q /mnt/diskmount || ${MOUNT} /dev/fd1 /mnt/diskmount
				        ${MOUNTDIR}/linux/vm_runtime
					${LOGGER} "openslx init file: done."
				        ;;
				stop|restart|force-reload) exit 0 ;;
				*)      echo "Usage: $0 {start}" >&2; exit 1 ;;
			esac
		THEREDOC
		chmod +x "${SERVICEDIR}"/"${SERVICEFILE}"
		echo "openslx praeinstaller: enabling ${SERVICEFILE}."
		update-rc.d "${SERVICEFILE}" defaults
		;;
	*)	echo "openslx praeinstaller: Could not determine mother-of-all-processes (not systemd, not init)."
		echo "openslx praeinstaller: Giving up, exiting."
		exit 1
esac

exit 0