openwrt/target/linux/generic/other-files/init

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#!/bin/sh
# Copyright (C) 2006 OpenWrt.org
export INITRAMFS=1
# switch to tmpfs to allow run daemons in jail on initramfs boot
DIRS=$(echo *)
NEW_ROOT=/new_root
mkdir -p $NEW_ROOT
mount -t tmpfs tmpfs $NEW_ROOT
cp -pr $DIRS $NEW_ROOT
exec switch_root $NEW_ROOT /sbin/init