#! /bin/sh
# postinst script for nodm, partially based on gdm3.postinst

set -e

THIS_PACKAGE=nodm
DEFAULT_DISPLAY_MANAGER_FILE=/etc/X11/default-display-manager

. /usr/share/debconf/confmodule

# debconf is not a registry, so we only fiddle with the default file if
# the configure script requested an update
if [ -e $DEFAULT_DISPLAY_MANAGER_FILE.debconf-update ]; then
	rm -f $DEFAULT_DISPLAY_MANAGER_FILE.debconf-update
	if db_get shared/default-x-display-manager; then
		# workaround debconf passthru bug (#379198)
		if [ -z "$RET" ]; then
			RET="$THIS_PACKAGE"
		fi
		if [ "$THIS_PACKAGE" != "$RET" ]; then
			echo "Please be sure to run \"dpkg --configure $RET\"." >&2
		fi
		if db_get "$RET"/daemon_name; then
			echo "$RET" > $DEFAULT_DISPLAY_MANAGER_FILE
		fi
	fi
fi

DEFAULT_SERVICE=/etc/systemd/system/display-manager.service
# set default-display-manager systemd service link according to our config
if [ "$1" = configure ] && [ -d /etc/systemd/system/ ]; then
	if [ -e "$DEFAULT_DISPLAY_MANAGER_FILE" ]; then
		SERVICE=/lib/systemd/system/$(basename $(cat "$DEFAULT_DISPLAY_MANAGER_FILE")).service
		if [ -h "$DEFAULT_SERVICE" ] && [ $(readlink "$DEFAULT_SERVICE") = /dev/null ]; then
			echo "Display manager service is masked" >&2
		elif [ -e "$SERVICE" ]; then
			ln -sf "$SERVICE" "$DEFAULT_SERVICE"
		else
			echo "WARNING: $SERVICE is the selected default display manager but does not exist" >&2
			rm -f "$DEFAULT_SERVICE"
		fi
	else
		rm -f "$DEFAULT_SERVICE"
	fi
fi

if [ "$1" = "configure" ] ; then
	if [ -n "$2" ] && dpkg --compare-versions "$2" lt "0.2"; then
		# Before version 0.2, nodm was only used on the OpenMoko.  To
		# guarantee a smooth upgrade, we can safely override debconf here
		# using the openmoko parameters.
		db_set nodm/enabled true
		db_set nodm/first_vt "3"
		db_set nodm/x_options "-nolisten tcp"
	fi
	if [ -n "$2" ] && dpkg --compare-versions "$2" lt "0.5"; then
		# Add the NODM_FIRST_VT entry to the config file if it is missing
		if [ -s /etc/default/nodm ] && ! grep -q NODM_FIRST_VT /etc/default/nodm
		then
			cat <<EOF >> /etc/default/nodm

# First vt to try when looking for free VTs
NODM_FIRST_VT=7
EOF
		fi
	fi

	# Update /etc/default/nodm
	db_get nodm/enabled
	NODM_ENABLED="$RET"
	db_get nodm/user
	NODM_USER="$RET"
	db_get nodm/first_vt
	NODM_FIRST_VT="$RET"
	db_get nodm/x_options
	NODM_X_OPTIONS="$RET"
	db_get nodm/min_session_time
	NODM_MIN_SESSION_TIME="$RET"
	db_get nodm/xsession
	NODM_XSESSION="$RET"
	db_get nodm/x_timeout
	NODM_X_TIMEOUT="$RET"

	if [ -s /etc/default/nodm ] ; then
		sed -i -r -e "s,^NODM_ENABLED=.*,NODM_ENABLED=$NODM_ENABLED," \
			-e "s,^NODM_USER=.*,NODM_USER=$NODM_USER," \
			-e "s,^NODM_FIRST_VT=.*,NODM_FIRST_VT='$NODM_FIRST_VT'," \
			-e "s,^NODM_X_OPTIONS=.*,NODM_X_OPTIONS='$NODM_X_OPTIONS'," \
			-e "s,^NODM_MIN_SESSION_TIME=.*,NODM_MIN_SESSION_TIME=$NODM_MIN_SESSION_TIME," \
			-e "s,^NODM_XSESSION=.*,NODM_XSESSION=$NODM_XSESSION," \
			-e "s,^NODM_X_TIMEOUT=.*,NODM_X_TIMEOUT=$NODM_X_TIMEOUT," \
			/etc/default/nodm
	else
		cat <<EOF > /etc/default/nodm
# nodm configuration

# Set NODM_ENABLED to something different than 'false' to enable nodm
NODM_ENABLED=$NODM_ENABLED

# User to autologin for
NODM_USER=$NODM_USER

# First vt to try when looking for free VTs
NODM_FIRST_VT=$NODM_FIRST_VT

# X session
NODM_XSESSION=$NODM_XSESSION

# Options for nodm itself
NODM_OPTIONS=

# Options for the X server.
#
# Format: [/usr/bin/<Xserver>] [:<disp>] <Xserver-options>
#
# The Xserver executable and the display name can be omitted, but should
# be placed in front, if nodm's defaults shall be overridden.
NODM_X_OPTIONS='$NODM_X_OPTIONS'

# If an X session will run for less than this time in seconds, nodm will wait an
# increasing bit of time before restarting the session.
NODM_MIN_SESSION_TIME=$NODM_MIN_SESSION_TIME

# Timeout (in seconds) to wait for X to be ready to accept connections. If X is
# not ready before this timeout, it is killed and restarted.
NODM_X_TIMEOUT=$NODM_X_TIMEOUT
EOF
	fi
fi

# Automatically added by dh_installinit/13.3.4
if [ "$1" = "configure" ] || [ "$1" = "abort-upgrade" ] || [ "$1" = "abort-deconfigure" ] || [ "$1" = "abort-remove" ] ; then
	if [ -x "/etc/init.d/nodm" ]; then
		update-rc.d nodm defaults >/dev/null
		invoke-rc.d --skip-systemd-native nodm start || exit 1
	fi
fi
# End automatically added section
# Automatically added by dh_installsystemd/13.3.4
if [ "$1" = "configure" ] || [ "$1" = "abort-upgrade" ] || [ "$1" = "abort-deconfigure" ] || [ "$1" = "abort-remove" ] ; then
	if [ -d /run/systemd/system ]; then
		systemctl --system daemon-reload >/dev/null || true
		deb-systemd-invoke start 'nodm.service' >/dev/null || true
	fi
fi
# End automatically added section


# tell debconf we are done. otherwise, it hangs waiting for the daemon.
db_stop;

if [ "$1" = configure ] && [ -n "$2" ]; then
	touch /var/run/reboot-required || true
fi

exit 0