base-files: rework reset button script to indicate factory reset

With this change we let user know 5 seconds have passed and reset button
can be released (to trigger factory reset)

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>

SVN-Revision: 46650

package/base-files/files/etc/rc.button/reset

@@ -1,11 +1,16 @@
 #!/bin/sh
 
-[ "${ACTION}" = "released" ] || exit 0
-
 . /lib/functions.sh
 
-logger "$BUTTON pressed for $SEEN seconds"
-
+case "$ACTION" in
+pressed)
+	return 5
+;;
+timeout)
+	. /etc/diag.sh
+	set_state failsafe
+;;
+released)
 	if [ "$SEEN" -lt 1 ]
 	then
 		echo "REBOOT" > /dev/console
@@ -16,5 +21,7 @@ then
 		echo "FACTORY RESET" > /dev/console
 		jffs2reset -y && reboot &
 	fi
+;;
+esac
 
 return 0