val download : t -> string -> string -> unit
(** download a file to the local machine *)
+val checksum : t -> string -> string -> string
+(** compute MD5, SHAx or CRC checksum of file *)
+
+val tar_in : t -> string -> string -> unit
+(** unpack tarfile to directory *)
+
+val tar_out : t -> string -> string -> unit
+(** pack directory into tarfile *)
+
+val tgz_in : t -> string -> string -> unit
+(** unpack compressed tarball to directory *)
+
+val tgz_out : t -> string -> string -> unit
+(** pack directory into compressed tarball *)
+