extern int guestfs_blockdev_rereadpt (guestfs_h *handle, const char *device);
extern int guestfs_upload (guestfs_h *handle, const char *filename, const char *remotefilename);
extern int guestfs_download (guestfs_h *handle, const char *remotefilename, const char *filename);
+extern char *guestfs_checksum (guestfs_h *handle, const char *csumtype, const char *path);