generic-poky/meta/recipes-core/initscripts/initscripts-1.0/read-only-rootfs-hook.sh

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#!/bin/sh
. /etc/default/rcS
[ "$ROOTFS_READ_ONLY" = "no" ] && exit 0
if [ "$1" = "start" ] ; then
grep -q "tmpfs /var/volatile" /proc/mounts || mount /var/volatile
mkdir -p /var/volatile/lib
cp -a /var/lib/* /var/volatile/lib
mount --bind /var/volatile/lib /var/lib
fi