#!/bin/sh

LIVE_TERMINAL=""

live_usage()
{
	cat <<EOF
 'live' plugin:

   WARNING: To use the installer without rebooting, the current kernel and the
            installer's kernel must have the same version.

   -t, --text    Force use of text installer
   -e, --expert  Use expert installation mode
EOF
}

live_prepare()
{
	for arg in $@; do
		case "$arg" in
			-t|--text)
				TEXT=true
				export TEXT
				;;

			-e|--expert)
				EXPERT=true
				export EXPERT
				;;
		esac
	done

	if [ -z "$DISPLAY" ]; then
	    TEXT=true
	    export TEXT
	fi

	if [ "$TEXT" != true ]; then
		# Checking for x11
		if [ -n "$DISPLAY" ]; then
			# Checking for debconf frontend (gnome)
			if dpkg -s libgnome2-perl > /dev/null 2>&1; then
				DEBIAN_FRONTEND=gnome
				export DEBIAN_FRONTEND
			fi
		fi
	else
		DI_FRONTEND=newt
		export DI_FRONTEND
		[ "$TEXT" = true ] && export DEBIAN_FRONTEND=text
	fi

	# Checking for debconf frontend (LIVE_TERMINAL fallback)
	if [ -z $DEBIAN_FRONTEND ]; then
		LIVE_TERMINAL="x-terminal-emulator -e"
	fi

	# Find an debian-installer initrd, preferably the gtk one
	for IMAGE in /run/live/medium/install/gtk/initrd.gz /run/live/medium/install/initrd.gz; do
		[ -e $IMAGE ] && break
	done

	[ ! -e $IMAGE ] && echo "no suitable d-i initrd image found, aborting." && return 1

	echo "Loading debian-installer..."

	# Create the temporary directory and mount a tmpfs on it to ease cleanup
	mkdir -p /run/live/installer
	mount -t tmpfs none /run/live/installer

	# Unpack the initrd
	cd /run/live/installer
	zcat $IMAGE | cpio -id > /dev/null 2>&1

	$LIVE_TERMINAL /usr/share/debian-installer-launcher/debconf_kernel.sh || return 1

	# Preseeding shutdown command
	cat >> preseed.cfg << EOF
# Select udeb for installation to allow exiting the installer
d-i anna/choose_modules string di-utils-exit-installer apt-cdrom-udeb
# Ask question regardless from that it's preseeded above
d-i anna/choose_modules seen false
# Skip the exit timeout
d-i di-utils-reboot/really_reboot boolean false
EOF

	# Preseeding installer expert mode
	if [ "$EXPERT" = true ]; then
		cat >> preseed.cfg << EOF
# Setting expert mode
d-i debconf/priority select low
debconf debconf/priority select low
EOF
	fi
}

live_cleanup () {
	# Stopping syslogd/klogd
	# These processes are assumed to be the only users of busybox within the chroot
	# which is a bit of a grubby way to identify them, but holds true for now.
	fuser -k /run/live/installer/bin/busybox > /dev/null 2>&1 || true

	# Remove unpacked initrd
	cd
	umount -l /run/live/installer
	rm -f /tmp/debian-installer
}

live_run()
{
	# Bindmount installer media
	mkdir -p /run/live/installer/cdrom
	mount -o bind /run/live/medium /run/live/installer/cdrom

	# Bindmount filesytem
	for fs in /dev /dev/pts /proc /sys /tmp; do
		mount -o bind $fs /run/live/installer/$fs
	done

	if [ -n "$DISPLAY" ]; then
		xhost +local:
	fi

	# Launching debian-installer
	/usr/share/debian-installer-launcher/debian-installer.sh
}