added backuptool, official 2.7.0 tag
diff --git a/prebuilt/common/bin/backuptool.sh b/prebuilt/common/bin/backuptool.sh
new file mode 100755
index 0000000..25c1d0d
--- /dev/null
+++ b/prebuilt/common/bin/backuptool.sh
@@ -0,0 +1,53 @@
+#!/sbin/sh
+#
+# Backup and restore addon /system files
+#
+
+export C=/tmp/backupdir
+export S=/system
+export V=10
+
+# Preserve /system/addon.d in /tmp/addon.d
+preserve_addon_d() {
+ mkdir -p /tmp/addon.d/
+ cp -a /system/addon.d/* /tmp/addon.d/
+ chmod 755 /tmp/addon.d/*.sh
+}
+
+# Restore /system/addon.d in /tmp/addon.d
+restore_addon_d() {
+ cp -a /tmp/addon.d/* /system/addon.d/
+ rm -rf /tmp/addon.d/
+}
+
+# Execute /system/addon.d/*.sh scripts with $1 parameter
+run_stage() {
+for script in $(find /tmp/addon.d/ -name '*.sh' |sort -n); do
+ $script $1
+done
+}
+
+case "$1" in
+ backup)
+ mkdir -p $C
+ check_prereq
+ preserve_addon_d
+ run_stage pre-backup
+ run_stage backup
+ run_stage post-backup
+ ;;
+ restore)
+ check_prereq
+ run_stage pre-restore
+ run_stage restore
+ run_stage post-restore
+ restore_addon_d
+ rm -rf $C
+ sync
+ ;;
+ *)
+ echo "Usage: $0 {backup|restore}"
+ exit 1
+esac
+
+exit 0