Attempt to set the proper uid/gid/contexts on new files and dirs

Files and folders that we create during backups, copy log, or MTP
operations often do not have the proper uid/gid/contexts assigned.
We will attempt to read the proper contexts from the settings
storage path and assign those same contexts to any files or dirs
that we create.

Change-Id: I769f9479854122b49b499de2175e6e2d026f8afd

twrp.cpp

@@ -35,6 +35,7 @@ extern "C" {
 
 extern "C" {
 #include "gui/gui.h"
+#include "set_metadata.h"
 }
 #include "twcommon.h"
 #include "twrp-functions.hpp"
@@ -274,6 +275,12 @@ int main(int argc, char **argv) {
 		if (gui_startPage("decrypt") != 0) {
 			LOGERR("Failed to start decrypt GUI page.\n");
 		}
+	} else if (datamedia) {
+		if (tw_get_default_metadata(DataManager::GetSettingsStoragePath().c_str()) != 0) {
+			LOGERR("Failed to get default contexts and file mode for storage files.\n");
+		} else {
+			LOGINFO("Got default contexts and file mode for storage files.\n");
+		}
 	}
 
 	// Read the settings file