#!/bin/sh

# In order to give proper access to the tty, we need to locate the device
# corresponding to the console we are actually using.

NL="
"

console=
if ! [ -f /var/run/console-device ]; then
	# If the kernel emitted a "handover" message, then it's the one
	case $(uname -r) in
	    2.6.2*|2.6.3[01]*)
		console="$(dmesg -s 262143 |
			sed -n -r -e 's/(.*\])? *console handover: boot \[.*\] -> real \[(.*)\]$/\2/p')"
		;;
	    2.6.3[234567]*)
		console="$(dmesg -s 262143 |
			sed -n -r -e 's/(.*\])? *console \[(.*)\] enabled, bootconsole disabled$/\2/p')"
		;;
	    *) # >= 2.6.38
		console_major_minor="$(get-real-console-linux)"
		console_raw="$(readlink "/sys/dev/char/${console_major_minor}")"
		console="${console_raw##*/}"
		;;
	esac

	# Except if it is the wrong type...
	if [ "$console" ] && [ "$(console-type)" = serial ] && \
	   expr "$console" : "tty[0-9]" >/dev/null; then
		console=
	fi

	consoles=
	if [ -z "$console" ]; then
		# Retrieve all enabled consoles from boot log; ignore those
		# for which no device file exists
		for cons in $(dmesg -s 262143 |
			sed -n -r -e 's/(.*\])? *console \[(.*)\] enabled/\2/p')
		do
			if [ -e "/dev/$cons" ]; then
				consoles="${consoles:+$consoles$NL}$cons"
			fi
		done
		# Only one console? Then we are good.
		if [ $(echo "$consoles" | wc -l) -eq 1 ]; then
			console="$consoles"
		fi
	fi

	if [ -z "$console" ]; then
		# Locate the last enabled console present on the command line
		for arg in $(cat /proc/cmdline); do
			case $arg in
			    console=*)
				arg=${arg#console=}
				cons=${arg%%,*}
				if echo "$consoles" | grep -q "^$cons$"; then
					console=$cons
				fi
				;;
			esac
		done
	fi

	if [ -z "$console" ]; then
		# Still nothing? Default to /dev/console.
		console=console
	fi
	echo /dev/$console > /var/run/console-device
fi

# Some other session may have it as ctty. Steal it from them
exec /sbin/steal-ctty $(cat /var/run/console-device) "$@"