#!/bin/sh

# This file is run by calling /sbin/init.alboot via its /sbin/altboot symlink.
# It is used to configure the boot-partition for the next reboot while the system
# is running.

# Try to determine the original root device file via /proc/cmdline	
for par in `cat /proc/cmdline`
do
	if ( echo "$par" | grep -q "^root=" )
	then
		ROOT_DEVICE="`echo "$par" | sed -n "s/.*\=\(.*\)/\1/p"`"
		#test -e "$ROOT_DEVICE" && ROOT_DEVICE=""
	fi

	if ( echo "$par" | grep -q "^rootfstype=" )
	then
		ROOT_FSTYPE="`echo "$par" | sed -n "s/.*\=\(.*\)/\1/p"`"
	fi				
done

#debug_echo "ROOT_DEVICE [$ROOT_DEVICE] FSTYPE [$ROOT_FSTYPE]"

if test -n "$ROOT_DEVICE" -a -n "$ROOT_FSTYPE"
then
	if test "`df | grep " /$" | awk '{print $1}'`" != "$ROOT_DEVICE"
	then
		# We are pivoted into a different rootfs
		# Now try to determine where the real rootfs is mounted (if it is mounted at all)

		# There  might be more than one entry for ROOT_DEVICE (think udev and friends)

		root_mountpoint="`df | grep "$ROOT_DEVICE " | awk '{print $6}'`"
		
		if test -z "$root_mountpoint"
		then
#				debug_echo "altboot(): Trying to mount [$ROOT_DEVICE]..."
			mkdir -p /media/ROM

			mount -t $ROOT_FSTYPE $ROOT_DEVICE /media/ROM
			ALTBOOT_LAST_FILE="/media/ROM$ALTBOOT_LAST_FILE"
		else
			mount -o remount,rw "$root_mountpoint"
			ALTBOOT_LAST_FILE="$root_mountpoint$ALTBOOT_LAST_FILE"
		fi	
	else
		x=y
#		debug_echo "altboot.sbin(): Running from the original rootfs!"			
	fi
else
	echo -e "\nWARNING: ROOT_DEVICE is not defined in /etc/altboot-2.*.conf\nand could not be determined by looking at your kernel CMDLINE."
	echo -e "If you are pivoted into a different rootfs than the original rootfs\nof your device, the \"altboot\" command will *not* work correctly."
	echo -en "\nPress [ENTER] to continue, or Ctrl-C to abort. "
	read junk		
fi

#	debug_echo "altboot(): ALTBOOT_LAST_FILE [$ALTBOOT_LAST_FILE]"
! test -e "$ALTBOOT_LAST_FILE" && mdie "Failed to determine rootfs mountpoint...."

# last_selection is the previously selected menu item by the user
last_selection_num="`cat "$ALTBOOT_LAST_FILE" | awk '{print $1}'`" >/dev/null 2>&1
last_selection_data="`cat "$ALTBOOT_LAST_FILE" | sed -n "s/[0-9]\{1,\}\ \(.*\)$/\1/p"`"				
test -z "$last_selection_num" && last_selection_num="1"	

show_menu /etc/altboot-menu 
wait_for_input >"$OUT_TTY" 
launch_selection /etc/altboot-menu >"$OUT_TTY"	
exit 0