int copy_tree(const char *from, const char *to, bool merge);
int copy_tree_at(int fdf, const char *from, int fdt, const char *to, bool merge);
int copy_directory_fd(int dirfd, const char *to, bool merge);
+int copy_directory(const char *from, const char *to, bool merge);
#endif // 0
int copy_bytes(int fdf, int fdt, uint64_t max_bytes, bool try_reflink);
#if 0 /// UNNEEDED by elogind