#!/bin/ash
# Copyright (c) 2013, 2014 - bwLehrpool Projekt
# Copyright (c) 2012 - OpenSLX GmbH
#
# This program is free software distributed under the GPL version 2.
# See http://openslx.org/COPYING
#
# If you have any feedback please consult http://openslx.org/feedback and
# send your feedback to feedback@openslx.org
#
# General information about OpenSLX can be found at http://openslx.org
#
# First script for initial ramfs for OpenSLX linux stateless clients
#############################################################################

# set PATH correctly
export PATH=/bin:/sbin:/usr/bin:/usr/sbin

# import common functions
. "/inc/functions"

# mount the important standard directories
[ ! -f /proc/cpuinfo ] && busybox mount -n -t proc proc /proc
bench_event "KERNEL" "Kernel initialized"
[ ! -d /sys/class ] && busybox mount -n -t sysfs sysfs /sys

# NOTE: busybox mount is only available through the busybox binary,
# the link had to be dropped, to prevent bugs in the stage32.
busybox mount -n -t devtmpfs -o 'rw,relatime,nosuid,noexec,mode=0755' initramfsdevs /dev
busybox mount -n -t tmpfs -o 'mode=755' run "/run"

# preparations for mounting stage3.2
FUTURE_ROOT="/dev/shm/uniontmp"
mkdir -p "$FUTURE_ROOT" /rorootfs
busybox mount -n -t tmpfs -o 'mode=755' none "$FUTURE_ROOT"
mkdir -p "$FUTURE_ROOT/opt/openslx"


# Get all variables we care about from the KCL
. /inc/parse_kcl

# NOTE: this is only relevant when using the distro's kernel
# load kernel modules as given in /etc/modules
modprobe -a -b $(cat /etc/modules) 2>/dev/null

# Load drm gfx drivers, if successful, check if splash screen should be shown, and do so
. "/inc/drm.functions"
if [ "$SPLASH" -eq 1 ]; then
	if setup_gfx; then
		echo "1 1 0 1" > /proc/sys/kernel/printk
		exec 4>&1 5>&2 > /dev/null 2>&1
		MUTED_OUTPUT=1
		clear
		echo -e "\033[?25l" >&4
		if [ -e "/etc/splash.ppm.gz" ]; then
			fbsplash -x -b -s "/etc/splash.ppm.gz" &
		elif [ -e "/etc/splash.ppm" ]; then
			fbsplash -x -b -s "/etc/splash.ppm" &
		else
			echo "Splash screen requested, but not found in initramfs..." >&4
		fi
	fi
else
	setup_gfx
fi

# suppress kernel output if DEBUG is set and no splash screen is requested
if [ $SPLASH -eq 0 ]; then
	[ $DEBUG -ge 1 ] && echo "4 4 1 7" > /proc/sys/kernel/printk || echo "1 1 0 1" >/proc/sys/kernel/printk
fi

[ $DEBUG -ge 4 ] && drop_shell "Requested Debug Shell: before network."

. "/inc/setup_network" || . "/inc/setup_network_retry" || drop_shell "Error setting up network"
bench_event "NETWORK" "Network up and running"

[ $DEBUG -ge 3 ] && drop_shell "Requested Debug Shell: after network/before configuring."

. "/inc/activate_sysconfig" || drop_shell "Could not source /inc/activate_sysconfig"
bench_event "CONFIG" "Downloaded config"
# From here on, we have all the vars from /opt/openslx/config

# Sync time via NTP
. "/inc/ntp_sync"

[ $DEBUG -ge 2 ] && drop_shell "Requested Debug Shell: after configuration/before stage32."

. "/inc/setup_stage32" || drop_shell "Problem setting up stage3.2"
bench_event "STAGE32" "Downloaded stage 3.2"

# copy files needed for stage3.2 to FUTURE_ROOT
echo "Copying busybox etc. to stage32..."
tar -cp /bin/* /sbin/* | tar -xp -C "${FUTURE_ROOT}/opt/openslx/"
mkdir -p "${FUTURE_ROOT}/opt/openslx/inc"
cp -a "/inc/functions" "${FUTURE_ROOT}/opt/openslx/inc/"

# set the SLX_ROOT_PASS if given in config
if [ ! -z "$SLX_ROOT_PASS" ]; then
	sed -i "s#^root:[^:]*:#root:$SLX_ROOT_PASS:#" "${FUTURE_ROOT}/etc/shadow"
fi
# set the SLX_DEMO_PASS if given in config
if [ ! -z "$SLX_DEMO_PASS" ]; then
	sed -i "s#^demo:[^:]*:#demo:$SLX_DEMO_PASS:#" "${FUTURE_ROOT}/etc/shadow"
fi

# one last debug shell if activated
[ $DEBUG -ge 1 ] && drop_shell "Requested Debug Shell: before switch_root."

# Activate debug shell after switchroot?
[ -n "$DEBUG_SHELL" ] && ln -s "../debug-shell.service" "${FUTURE_ROOT}/usr/lib/systemd/system/sysinit.target.wants/debug-shell.service"

# need /proc for this ;)
bench_event "PRESWITCH" "Switching to stage 3.2"

# unmount filesystems
for mnt in proc sys run ; do
	busybox umount -f -l "/$mnt" 2>/dev/null
done

# HACK HACK: Klausurmodus
# Putting this here as we're hopefully moving to the all new dracut solution soon
# so there's no reason to make it pretty now
if [ -n "$SLX_EXAM" ]; then
	# Visual: Make kdm all orange
	sed -i 's/#e3e4e9/#f9a72b/g' "${FUTURE_ROOT}/usr/share/desktop/themes/kdm/bwlehrpool/theme.xml"
	# Set autologindelay to 0 to directly boot
	sed -i 's/^AutoLoginDelay=.*/AutoLoginDelay=0/g' "${FUTURE_ROOT}/etc/kde4/kdm/kdmrc"
	# Visual: Move splash screen to upper left corner
	if [ -e "/etc/splash.ppm.gz" ]; then
		fbsplash -b -s "/etc/splash.ppm.gz" &
	elif [ -e "/etc/splash.ppm" ]; then
		fbsplash -b -s "/etc/splash.ppm" &
	fi
	# Visual: ssh banner
	echo "+ - - - - KLAUSURMODUS AKTIV - - - - +" >> "${FUTURE_ROOT}/etc/issue.net"
	echo "++++++++++++++++++++++++++++++++++++++" >> "${FUTURE_ROOT}/etc/issue.net"
	# Disable ctrl-alt-delete
	rm -- "${FUTURE_ROOT}/usr/lib/systemd/system/ctrl-alt-del.target"
	# No idleaction
	rm -- "${FUTURE_ROOT}/etc/cron.d/openslx-idleaction"
	# Ignore everything but power button
	cat > "${FUTURE_ROOT}/etc/systemd/logind.conf" <<EOF
[Login]
NAutoVTs=0
ReserveVT=0
KillUserProcesses=no
HandlePowerKey=poweroff
HandleSuspendKey=ignore
HandleHibernateKey=ignore
HandleLidSwitch=ignore
IdleAction=ignore
EOF
	# Link exam.service in sysinit.target
	ln -s "../exam.service" "${FUTURE_ROOT}/etc/systemd/system/sysinit.target.wants/exam.service"
fi

echo "Switching root...."
echo "$bench_result" > "${FUTURE_ROOT}/opt/openslx/.benchmark"
# Prepare environment (HOME is needed as a hack for nss_ldap with ssl and no caching)
unset BOOT_IMAGE initrd KCL ip slxbase slxsrv IPINFO vga ip MAC BOOTIF DEBUG OLDPWD MUTED_OUTPUT GFX
export HOME=/
export init="/usr/lib/systemd/systemd"
export recovery=
export PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/opt/openslx/sbin:/opt/openslx/bin"
exec /sbin/switch_root -c /dev/console /mnt /usr/lib/systemd/systemd