1 files changed, 62 insertions, 0 deletions
diff --git a/scripts/boot/persistence-excludes.sh b/scripts/boot/persistence-excludes.sh
new file mode 100755
index 0000000..ee9521e
--- /dev/null
+++ b/scripts/boot/persistence-excludes.sh
@@ -0,0 +1,62 @@
+#!/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
+}