From 8c5088d5fc2f5a8bbc0a0735e5c0368800ab324f Mon Sep 17 00:00:00 2001
From: Darth9 <reyprimerjefe@gmail.com>
Date: Tue, 9 Aug 2022 12:54:40 +0100
Subject: [PATCH] backup: support exclusion of user-defined directories from
 backups

Example: TW_BACKUP_EXCLUSIONS := /data/fonts,/data/blah,/data/geewhiz

Change-Id: I99e690eb0879281b1149e60ff430b6b3e7dd93c2
(cherry picked from commit cc683e7a3deefb96ece49b07bf88648087a7ccaf)
---
 Android.mk    |  3 +++
 partition.cpp | 14 ++++++++++++++
 2 files changed, 17 insertions(+)

diff --git a/Android.mk b/Android.mk
index 84dc6bec..0d2708d4 100755
--- a/Android.mk
+++ b/Android.mk
@@ -408,6 +408,9 @@ endif
 ifneq ($(TARGET_OTA_ASSERT_DEVICE),)
     LOCAL_CFLAGS += -DTARGET_OTA_ASSERT_DEVICE='"$(TARGET_OTA_ASSERT_DEVICE)"'
 endif
+ifneq ($(TW_BACKUP_EXCLUSIONS),)
+	LOCAL_CFLAGS += -DTW_BACKUP_EXCLUSIONS='"$(TW_BACKUP_EXCLUSIONS)"'
+endif
 
 LOCAL_C_INCLUDES += system/vold \
 
diff --git a/partition.cpp b/partition.cpp
index 315a159a..4854fbee 100755
--- a/partition.cpp
+++ b/partition.cpp
@@ -33,6 +33,7 @@
 #include <zlib.h>
 #include <sstream>
 #include <android-base/properties.h>
+#include <android-base/strings.h>
 #include <libsnapshot/snapshot.h>
 
 #include "cutils/properties.h"
@@ -1247,6 +1248,19 @@ void TWPartition::Setup_Data_Media() {
 		backup_exclusions.add_absolute_dir("/data/extm"); //exclude this dir to prevent "error 255" on MIUI
 		wipe_exclusions.add_absolute_dir(Mount_Point + "/misc/vold"); // adopted storage keys
 		ExcludeAll(Mount_Point + "/system/storage.xml");
+
+		// board-customisable exclusions
+		#ifdef TW_BACKUP_EXCLUSIONS
+			std::vector<std::string> user_extra_exclusions = TWFunc::Split_String(TW_BACKUP_EXCLUSIONS, ",");
+			std::string s1;
+			for (const std::string& extra_x : user_extra_exclusions) {
+				s1 = android::base::Trim(extra_x);
+				if (!s1.empty()) {
+					backup_exclusions.add_absolute_dir(s1);
+					LOGINFO("Adding user-defined path '%s' to the backup exclusions\n", s1.c_str());
+				}
+			}
+		#endif
 	} else {
 		int i;
 		string path;