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#!/bin/sh
#set -e
persistence_exclude ()
{
# Persistence enhancer script
# This script saves precious time on slow persistence devices/image files
# and writes on flash based device.
# a tmpfs on $PERSTMP is mounted and directories listed in
# /etc/live-persistence.binds will be copied there and then bind mounted back.
if [ -z "${PERSISTENCE}" ] || [ -n "${NOPERSISTENCE}" ] || [ -z "${PERSISTENCE_IS_ON}" ] || [ ! -f /root/etc/live-persistence.binds ]
then
return
fi
# FIXME: stop hardcoding overloading of initramfs-tools functions
. /scripts/functions
. /lib/live/boot/initramfs-tools.sh
dirs="$(sed -e '/^ *$/d' -e '/^#.*$/d' /root/etc/live-persistence.binds | tr '\n' '\0')"
if [ -z "${dirs}" ]
then
return
fi
log_begin_msg "Moving persistence bind mounts"
PERSTMP="/root/live/persistence-binds"
CPIO="/bin/cpio"
if [ ! -d "${PERSTMP}" ]
then
mkdir -p "${PERSTMP}"
fi
mount -t tmpfs tmpfs "${PERSTMP}"
for dir in $(echo "${dirs}" | tr '\0' '\n')
do
if [ ! -e "/root/${dir}" ] && [ ! -L "/root/${dir}" ]
then
# directory do not exists, create it
mkdir -p "/root/${dir}"
elif [ ! -d "/root/${dir}" ]
then
# it is not a directory, skip it
break
fi
# Copy previous content if any
cd "/root/${dir}"
find . -print0 | ${CPIO} -pumd0 "${PERSTMP}/${dir}"
cd "${OLDPWD}"
# Bind mount it to origin
mount -o bind "${PERSTMP}/${dir}" "/root/${dir}"
done
log_end_msg
}
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