vendor/aosp: Add back backuptool scripts
Partially reverts commit 1042d267cc4ecece281c82ca3bce98692f2f9ebd.
diff --git a/prebuilt/common/bin/backuptool.sh b/prebuilt/common/bin/backuptool.sh
new file mode 100644
index 0000000..8a6e7a5
--- /dev/null
+++ b/prebuilt/common/bin/backuptool.sh
@@ -0,0 +1,114 @@
+#!/sbin/sh
+#
+# Backup and restore addon /system files
+#
+
+export C=/tmp/backupdir
+export S=/system
+export V=6.0
+
+# Scripts in /system/addon.d expect to find backuptool.functions in /tmp
+cp -f /tmp/install/bin/backuptool.functions /tmp
+
+# Preserve /system/addon.d in /tmp/addon.d
+preserve_addon_d() {
+ if [ -d /system/addon.d/ ]; then
+ mkdir -p /tmp/addon.d/
+ cp -a /system/addon.d/* /tmp/addon.d/
+ chmod 755 /tmp/addon.d/*.sh
+ fi
+}
+
+# Restore /system/addon.d from /tmp/addon.d
+restore_addon_d() {
+ if [ -d /tmp/addon.d/ ]; then
+ cp -a /tmp/addon.d/* /system/addon.d/
+ rm -rf /tmp/addon.d/
+ fi
+}
+
+# Proceed only if /system is the expected major and minor version
+check_prereq() {
+# If there is no build.prop file the partition is probably empty.
+if [ ! -r /system/build.prop ]; then
+ return 0
+fi
+if ( ! grep -q "^ro.build.version.release=$V.*" /system/build.prop ); then
+ echo "Not backing up files from incompatible version: $V"
+ return 0
+fi
+return 1
+}
+
+check_blacklist() {
+ if [ -f /system/addon.d/blacklist ];then
+ ## Discard any known bad backup scripts
+ cd /$1/addon.d/
+ for f in *sh; do
+ s=$(md5sum $f | cut -c-32)
+ grep -q $s /system/addon.d/blacklist && rm -f $f
+ done
+ fi
+}
+
+check_whitelist() {
+ found=0
+ if [ -f /system/addon.d/whitelist ];then
+ ## forcefully keep any version-independent stuff
+ cd /$1/addon.d/
+ for f in *sh; do
+ s=$(md5sum $f | cut -c-32)
+ grep -q $s /system/addon.d/whitelist
+ if [ $? -eq 0 ]; then
+ found=1
+ else
+ rm -f $f
+ fi
+ done
+ fi
+ return $found
+}
+
+# Execute /system/addon.d/*.sh scripts with $1 parameter
+run_stage() {
+if [ -d /tmp/addon.d/ ]; then
+ for script in $(find /tmp/addon.d/ -name '*.sh' |sort -n); do
+ $script $1
+ done
+fi
+}
+
+case "$1" in
+ backup)
+ mkdir -p $C
+ if check_prereq; then
+ if check_whitelist system; then
+ exit 127
+ fi
+ fi
+ check_blacklist system
+ preserve_addon_d
+ run_stage pre-backup
+ run_stage backup
+ run_stage post-backup
+ ;;
+ restore)
+ if check_prereq; then
+ if check_whitelist tmp; then
+ exit 127
+ fi
+ fi
+ check_blacklist tmp
+ 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