Merge "SYSTEM_ROOT -> get_system_root"

roots.cpp

@@ -45,6 +45,7 @@
 
 static struct fstab* fstab = nullptr;
 static bool did_map_logical_partitions = false;
+static constexpr const char* SYSTEM_ROOT = "/system";
 
 extern struct selabel_handle* sehandle;
 
@@ -408,3 +409,11 @@ int setup_install_mounts() {
 bool logical_partitions_mapped() {
   return did_map_logical_partitions;
 }
+
+std::string get_system_root() {
+  if (volume_for_mount_point(SYSTEM_ROOT) == nullptr) {
+    return "/";
+  } else {
+    return SYSTEM_ROOT;
+  }
+}