+/**
+ * @brief check file exists
+ * in case of symlink file, check both input file and link reference file.
+ * @param[in] source path
+ * @return bool
+ */
+bool isFile(const std::string& path);
+
+/**
+ * @brief check symlink file
+ * @param[in] source path
+ * @return bool
+ */
+bool isSymlinkFile(const std::string& path);
+
+/**
+ * @brief check directory exists
+ * @param[in] source path
+ * @return bool
+ */
+bool isDirectory(const std::string& path);
+
+/**
+ * @brief check the file is managed assembly or not.
+ * @param[in] file path
+ * @return return true when the file is managed assembly.
+ * otherwise return false including native image case.
+ */
+bool isManagedAssembly(const std::string& filePath);
+
+/**
+ * @brief Resolve assembly files from directories and append their paths to the given list.
+ * @remark If a native image exists for an assembly in the same directory, it will be used.
+ * If multiple assemblies of the same name exist, the first one will be used.
+ * @param[in] directories list of directories
+ * @param[out] list colon-separated string of assembly paths
+ */
+void addAssembliesFromDirectories(const std::vector<std::string>& directories, std::string& list);
+
+/**
+ * @brief File search callback
+ * @param[in] path full path to a resolved file
+ * @param[in] filename file name
+ */
+typedef std::function<void (const std::string& path, const std::string& filename)> FileReader;
+
+/**
+ * @brief Scan all files in the given directory.
+ * @param[in] directory path to a root directory
+ * @param[in] reader callback for iteration
+ * @param[in] depth recursive search depth
+ */
+void scanFilesInDirectory(const std::string& directory, FileReader reader, unsigned int depth);
+
+/**
+ * @brief copy smack and ownership.
+ * @param[in] get path
+ * @param[in] set path
+ * @param[in] symbolic link
+ */
+void copySmackAndOwnership(const std::string& fromPath, const std::string& toPath, bool isSymlink = false);
+
+/**
+ * @brief check whether the path exists or not.
+ * @param[in] source path
+ * @return return true when the path exist.
+ */
+bool exist(const bf::path& path);
+
+/**
+ * @brief create the new directory.
+ * @param[in] source path
+ * @return return true when the directory was created.
+ */
+bool createDir(const bf::path& path);
+
+/**
+ * @brief copy the directory.
+ * @param[in] path to the source directory
+ * @param[in] path to the target directory
+ * @param[in] filesystem flag
+ * @return return true when the directory was copied.
+ */
+bool copyDir(const bf::path& path1, const bf::path& path2, FSFlag flags = FS_NONE);
+
+/**
+ * @brief copy the file.
+ * @param[in] path to the source file
+ * @param[in] path to the target file
+ * @return return true when the file was copied.
+ */
+bool copyFile(const bf::path& path1, const bf::path& path2);
+
+/**
+ * @brief moves of renames the file or directory.
+ * @param[in] path to the source file
+ * @param[in] path to the target file
+ * @return return true when the file was moved.
+ */
+bool moveFile(const bf::path& path1, const bf::path& path2);
+
+/**
+ * @brief removes the file or empty directory.
+ * @param[in] source path
+ * @return return true when the file was deleted.
+ */
+bool removeFile(const bf::path& path);