vendor: add custom backuptools and postinstall script for A/B OTAs
* A/B OTA devices wont run backuptools in recovery (because they don't
go in to recovery to do an OTA). In these cases let's use a modified
version to backup/restore from within android upon postinstall.
* Add backuptool_postinstall.sh which will be run prior to the normal
postinstall script in order to backup/restore via addon.d scripts.
* This needs to be done in such a manner because we need /postinstall
mounted rw instead of the ro with context= options which are used for
the normal postinstall (dexopt) script.
Change-Id: I51511870634dd1ec5388adafddb446f95cc5a950
diff --git a/prebuilt/common/bin/backuptool_ab.functions b/prebuilt/common/bin/backuptool_ab.functions
new file mode 100644
index 0000000..5a9ce56
--- /dev/null
+++ b/prebuilt/common/bin/backuptool_ab.functions
@@ -0,0 +1,51 @@
+#!/system/bin/sh
+#
+# Functions for backuptool_ab.sh
+#
+
+export S=/system
+export C=/postinstall/tmp/backupdir
+export V=8.1
+export backuptool_ab=true
+
+copy_file() {
+ # toybox's cp doesn't do directories correctly for whatever reason
+ mkdir -p `dirname $2`
+
+ cp -dp "$1" "$2"
+ # symlinks don't have a context
+ if [ ! -L "$1" ]; then
+ # it is assumed that every label starts with 'u:object_r' and has no white-spaces
+ local context=`ls -Z "$1" | grep -o 'u:object_r:[^ ]*' | head -1`
+ chcon "$context" "$2"
+ fi
+}
+
+backup_file() {
+ if [ -e "$1" -o -L "$1" ]; then
+ local FILE=`basename "$1"`
+ local DIR=`dirname "$1"`
+ # dont backup any apps that have odex files, they are useless
+ if ( echo "$FILE" | grep -q "\.apk$" ) && [ -e `echo "$1" | sed -e 's/\.apk$/\.odex/'` ]; then
+ echo "Skipping odexed apk $1";
+ else
+ mkdir -p "$C/$DIR"
+ copy_file "$1" "$C/$DIR/$FILE"
+ fi
+ fi
+}
+
+restore_file() {
+ local FILE=`basename "$1"`
+ local DIR=`dirname "$1"`
+ if [ -e "$C/$DIR/$FILE" -o -L "$C/$DIR/$FILE" ]; then
+ if [ ! -d "/postinstall/$DIR" ]; then
+ mkdir -p "/postinstall/$DIR";
+ fi
+ copy_file "$C/$DIR/$FILE" "/postinstall/$1";
+ if [ -n "$2" ]; then
+ echo "Deleting obsolete file $2"
+ rm "$2";
+ fi
+ fi
+}