#!/bin/sh
#
# Core shell functions that do not require bash.  These functions are used with
# busybox ash on legacy-flash boards, and with bash on all other boards.

die() {
	echo >&2 "$*";
	sleep 2;
	exit 1;
}

warn() {
	echo >&2 "$*";
	sleep 1;
}

DEBUG() {
	if [ "$CONFIG_DEBUG_OUTPUT" = "y" ];then
		echo "DEBUG: $*" | tee -a /tmp/debug.log >&2;
	fi
}

TRACE() {
        if [ "$CONFIG_ENABLE_FUNCTION_TRACING_OUTPUT" = "y" ];then
                echo "TRACE: $*" | tee -a /tmp/debug.log >&2;
        fi
}

preserve_rom() {
	TRACE "Under /etc/functions:preserve_rom"
	new_rom="$1"
	old_files=`cbfs -t 50 -l 2>/dev/null | grep "^heads/"`

	for old_file in `echo $old_files`; do
		new_file=`cbfs.sh -o $1 -l | grep -x $old_file`
		if [ -z "$new_file" ]; then
			echo "+++ Adding $old_file to $1"
			cbfs -t 50 -r $old_file >/tmp/rom.$$ \
			|| die "Failed to read cbfs file from ROM"
			cbfs.sh -o $1 -a $old_file -f /tmp/rom.$$ \
			|| die "Failed to write cbfs file to new ROM file"
		fi
	done
}

recovery() {
	TRACE "Under /etc/functions:recovery"
	echo >&2 "!!!!! $*"

	# Remove any temporary secret files that might be hanging around
	# but recreate the directory so that new tools can use it.

	#safe to always be true. Otherwise "set -e" would make it exit here
	shred -n 10 -z -u /tmp/secret/* 2> /dev/null || true
	rm -rf /tmp/secret
	mkdir -p /tmp/secret

	# ensure /tmp/config exists for recovery scripts that depend on it
	touch /tmp/config

	if [ "$CONFIG_TPM" = "y" ]; then
		tpmr extend -ix 4 -ic recovery
	fi

	while [ true ]
	do
		echo >&2 "!!!!! Starting recovery shell"
		sleep 1

		if [ -x /bin/setsid ]; then
			/bin/setsid -c /bin/sh
		else
			/bin/sh
		fi
	done
}

pause_recovery() {
	TRACE "Under /etc/functions:pause_recovery"
	read -p $'!!! Hit enter to proceed to recovery shell !!!\n'
	recovery $*
}

combine_configs() {
	TRACE "Under /etc/functions:combine_configs"
	cat /etc/config* > /tmp/config
}