Function svn_fs_set_uuid 

pub unsafe extern "C" fn svn_fs_set_uuid(
    fs: *mut svn_fs_t,
    uuid: *const c_char,
    pool: *mut apr_pool_t,
) -> *mut svn_error_t

If not @c NULL, associate @a *uuid with @a fs. Otherwise (if @a uuid is @c NULL), generate a new UUID for @a fs. Use @a pool for any scratch work.