openwrtv3/package/base-files/files/lib/firstboot/40_copy_ramoverlay

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#!/bin/sh
# Copyright (C) 2006-2010 OpenWrt.org
# Copyright (C) 2010 Vertical Communications
copy_ramoverlay() {
# try to avoid fs changing while copying
mount -o remount,ro none / 2>&-
# copy ramoverlay to jffs2
echo -n "copying files ... "
cp -a /tmp/root/* /rom/overlay 2>&-
echo "done"
}
boot_hook_add switch2jffs copy_ramoverlay