openwrt/package/base-files/files/lib/preinit/30_failsafe_wait

#!/bin/sh
# Copyright (C) 2006-2010 OpenWrt.org
# Copyright (C) 2010 Vertical Communications

fs_wait_for_key () {
	local timeout=$3
	local timer
	local do_keypress
	local keypress_true="$(mktemp)"
	local keypress_wait="$(mktemp)"
	local keypress_sec="$(mktemp)"
	if [ -z "$keypress_wait" ]; then
		keypress_wait=/tmp/.keypress_wait
		touch $keypress_wait
	fi
	if [ -z "$keypress_true" ]; then
		keypress_true=/tmp/.keypress_true
		touch $keypress_true
	fi
	if [ -z "$keypress_sec" ]; then
		keypress_sec=/tmp/.keypress_sec
		touch $keypress_sec
	fi

	trap "echo 'true' >$keypress_true; lock -u $keypress_wait ; rm -f $keypress_wait" INT
	trap "echo 'true' >$keypress_true; lock -u $keypress_wait ; rm -f $keypress_wait" USR1

	[ -n "$timeout" ] || timeout=1
	[ $timeout -ge 1 ] || timeout=1
	timer=$timeout
	lock $keypress_wait
	{
		while [ $timer -gt 0 ]; do
			pi_failsafe_net_message=true \
				preinit_net_echo "Please press button now to enter failsafe"
			echo "$timer" >$keypress_sec
			timer=$(($timer - 1))
			sleep 1
		done
		lock -u $keypress_wait
		rm -f $keypress_wait
	} &

	[ "$pi_preinit_no_failsafe" != "y" ] && echo "Press the [$1] key and hit [enter] $2"
	echo "Press the [1], [2], [3] or [4] key and hit [enter] to select the debug level"
	# if we're on the console we wait for input
	{
		while [ -r $keypress_wait ]; do
			timer="$(cat $keypress_sec)"

			[ -n "$timer" ] || timer=1
			timer="${timer%%\ *}"
			[ $timer -ge 1 ] || timer=1
			do_keypress=""
			{
				read -t "$timer" do_keypress
				case "$do_keypress" in
				$1)
					echo "true" >$keypress_true
					;;
				1 | 2 | 3 | 4)
					echo "$do_keypress" >/tmp/debug_level
					;;
				*)
					continue;
					;;
				esac
				lock -u $keypress_wait
				rm -f $keypress_wait
			}
		done
	}
	lock -w $keypress_wait

	keypressed=1
	[ "$(cat $keypress_true)" = "true" ] && keypressed=0

	rm -f $keypress_true
	rm -f $keypress_wait
	rm -f $keypress_sec

	return $keypressed
}

failsafe_wait() {
	FAILSAFE=
	[ "$pi_preinit_no_failsafe" = "y" ] && {
		fs_wait_for_key "" "" $fs_failsafe_wait_timeout
		return
	}
	grep -q 'failsafe=' /proc/cmdline && FAILSAFE=true && export FAILSAFE
	if [ "$FAILSAFE" != "true" ]; then
		fs_wait_for_key f 'to enter failsafe mode' $fs_failsafe_wait_timeout && FAILSAFE=true
		[ -f "/tmp/failsafe_button" ] && FAILSAFE=true && echo "- failsafe button "`cat /tmp/failsafe_button`" was pressed -"
		[ "$FAILSAFE" = "true" ] && export FAILSAFE && touch /tmp/failsafe
	fi
}

boot_hook_add preinit_main failsafe_wait