#!/bin/bash

# set -x

PS=$(which ps)
GREP=$(which grep)
LOGGER=$(which logger)
MKDIR=$(which mkdir)
MOUNT=$(which mount)
MOUNTDIR=/mnt/diskmount/
SERVICEMOUNT=openslx-mount.service
SERVICEUMOUNT=openslx-umount.service
SERVICERESOLUTION=openslx-resolution.service

# 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=/usr/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 (mounter) to ${SERVICEDIR}/${SERVICEMOUNT}."
		cat <<-HEREDOC > "$SERVICEDIR"/"$SERVICEMOUNT"
			[Unit]
			Description=openSLX share mounter
			After=basic.target
			
			[Service]
			Type=oneshot
			ExecStartPre=${MKDIR} -p /mnt/diskmount
			ExecStartPre=-${MOUNT} /dev/fd1 /mnt/diskmount
			ExecStart=${LOGGER} "openslx service file: mounter started."
			ExecStart=${MOUNTDIR}/linux/mnt_shares
			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 resolution utility
			Before=shutdown.target 
			
			[Service]
			Type=oneshot
			ExecStartPre=${MKDIR} -p /mnt/diskmount
			ExecStartPre=-${MOUNT} /dev/fd1 /mnt/diskmount
			ExecStart=${LOGGER} "openslx service file: umounter started."
			ExecStart=${MOUNTDIR}/linux/umount
			ExecStart=${LOGGER} "openslx service file: done."
			RemainAfterExit=no
		THEREDOC

# This bloc was meant for a resolution setting alternative via xorg.conf.d. As this did not work on time, it's
# just commented for now due to programmer's laziness, who was too lazy to store it elsewhere.
#		echo
#		echo "openslx praeinstaller: Which resolution script to install?"
#		echo
#		echo "There are two possibilies:"
#		echo ""
#		echo '1)	A script which waits until the xserver started, then checks for possible'
#		echo '	modelines (writes one if no sufficient modeline is detected, and waits for'
#		echo '	some time afterwards whether resolution changes again (eg. via display manager'
#		echo '	or such stuff. Fairly stable no more XSetup/Xreset patching.'
#		echo
#		echo '2)	Just a screen configuration dropped to xorg.conf.d, which restricts'
#		echo '	possible screen resolutions to just one. This may give trouble when screen,'
#		echo '	monitor etc. are hard-wired elsewhere (xorg.conf, xorg.conf.d).'
#		echo
#
#		while [ "$RESCRIPT" != "1" ] && [ "$RESCRIPT" != "2" ]; do
#			RESCRIPTDEF=1
#			read -e -p "Well, which one do you choose? (1/2, Default is $RESCRIPTDEF): " RESCRIPT
#			RESCRIPT="${RESCRIPT:-$RESCRIPTDEF}"
#		done
#
#		case $RESCRIPT in
#			1)	echo "openslx praeinstaller: installing systemd service (resolution utility) to ${SERVICEDIR}/${SERVICERESOLUTION}."
				echo "openslx praeinstaller: installing systemd service (resolution utility) to ${SERVICEDIR}/${SERVICERESOLUTION}."
				cat <<-SOMEWHEREDOC > "$SERVICEDIR"/"${SERVICERESOLUTION}"
				[Unit]
				Description=openSLX resolution utility
				After=display-manager.service

				[Service]
				Type=oneshot
				ExecStartPre=${MKDIR} -p /mnt/diskmount
				ExecStartPre=-${MOUNT} /dev/fd1 /mnt/diskmount
				ExecStart=${LOGGER} "openslx service file: resolution utility started."
				ExecStart=${MOUNTDIR}/linux/resolution
				ExecStart=${LOGGER} "openslx service file: done."
				RemainAfterExit=yes
				SOMEWHEREDOC
#				;;
#			2)	echo "openslx praeinstaller: installing systemd service (xorg.conf.d entry) to ${SERVICEDIR}/${SERVICERESOLUTION}."
#				cat <<-THEREDOC > "$SERVICEDIR"/"${SERVICERESOLUTION}"
#				[Unit]
#				Description=openSLX xorg.conf.d entry
#				Before=display-manager.service
#				[Service]
#				Type=oneshot
#				ExecStartPre=${MKDIR} -p /mnt/diskmount
#				ExecStartPre=-${MOUNT} /dev/fd1 /mnt/diskmount
#				ExecStart=${LOGGER} "openslx service file: resolution utility started."
#				ExecStart=${MOUNTDIR}/linux/xorgconf
#				ExecStart=${LOGGER} "openslx service file: done."
#				RemainAfterExit=yes
#				THEREDOC
#				;;
#			*)	echo "openslx praeinstaller: This should not have happened: RESCRIPT ($RESCRIPT) not set!"
#				exit 1
#				;;
#esac

		[ ! -d "$SERVICEDIR"/graphical.target.wants ]	&& mkdir "$SERVICEDIR"/graphical.target.wants 2>/dev/null
		[ ! -d "$SERVICEDIR"/basic.target.wants ]	&& mkdir "$SERVICEDIR"/basic.target.wants 2>/dev/null
		[ ! -d "$SERVICEDIR"/shutdown.target.wants ]	&& mkdir "$SERVICEDIR"/shutdown.target.wants 2>/dev/null

		ln -s "${SERVICEDIR}"/"${SERVICEMOUNT}" "$SERVICEDIR"/graphical.target.wants/"${SERVICEMOUNT}"
		ln -s "${SERVICEDIR}"/"${SERVICEUMOUNT}" "$SERVICEDIR"/shutdown.target.wants/"${SERVICEUMOUNT}"
		ln -s "${SERVICEDIR}"/"${SERVICERESOLUTION}" "$SERVICEDIR"/basic.target.wants/"${SERVICERESOLUTION}"

		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