be_snapshot
if ((err = be_snapshot(lbh, bootenv, NULL, true, snap_name)) != 0)
if ((err = be_snapshot(lbh, old, NULL, true, snap)) != 0)
int be_snapshot(libbe_handle_t *, const char *, const char *, bool, char *);
err = be_snapshot(be, bootenv, atpos, recursive, NULL);
err = be_snapshot(be, be_active_path(be), NULL,
err = be_snapshot(be, snapname, NULL, recursive,