1 files changed, 77 insertions, 0 deletions
diff --git a/scripts/live-bottom/08persistence_excludes b/scripts/live-bottom/08persistence_excludes
new file mode 100755
index 0000000..bc5c4d8
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+++ b/scripts/live-bottom/08persistence_excludes
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+#!/bin/sh
+
+# Persistence enhancer script
+# This script saves precious time on slow persistence devices/image files
+# and writes on flash based device.
+# a tmpfs on $PERSTMP is mounted and directories listed in
+# /etc/live-persistence.binds will be copied there and then bind mounted back.
+
+#set -e
+
+# initramfs-tools header
+
+PREREQ=""
+
+prereqs()
+{
+	echo "${PREREQ}"
+}
+
+case "${1}" in
+	prereqs)
+		prereqs
+		exit 0
+		;;
+esac
+
+# live-initramfs header
+
+if [ -z "${PERSISTENT}" ] || [ -n "${NOPERSISTENT}" ] || [ -z "${PERSISTENCE_IS_ON}" ] || [ ! -f /root/etc/live-persistence.binds ]
+then
+	exit 0
+fi
+
+. /scripts/live-functions
+
+# live-initramfs script
+
+dirs="$(cat /root/etc/live-persistence.binds | grep -v '^#.*$' | grep -v '^ *$' | tr '\n' '\0')"
+if [ -z "${dirs}" ]
+then
+	exit 0
+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